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Diffstat (limited to 'nanovg/nanovg_gl.c')
| -rw-r--r-- | nanovg/nanovg_gl.c | 1649 |
1 files changed, 1649 insertions, 0 deletions
diff --git a/nanovg/nanovg_gl.c b/nanovg/nanovg_gl.c new file mode 100644 index 0000000..9970842 --- /dev/null +++ b/nanovg/nanovg_gl.c @@ -0,0 +1,1649 @@ +// +// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org +// +// This software is provided 'as-is', without any express or implied +// warranty. In no event will the authors be held liable for any damages +// arising from the use of this software. +// Permission is granted to anyone to use this software for any purpose, +// including commercial applications, and to alter it and redistribute it +// freely, subject to the following restrictions: +// 1. The origin of this software must not be misrepresented; you must not +// claim that you wrote the original software. If you use this software +// in a product, an acknowledgment in the product documentation would be +// appreciated but is not required. +// 2. Altered source versions must be plainly marked as such, and must not be +// misrepresented as being the original software. +// 3. This notice may not be removed or altered from any source distribution. +// + +#if defined(NANOVG_GL2) + defined(NANOVG_GL3) + defined(NANOVG_GLES2) + defined(NANOVG_GLES3) != 1 +#error Define exactly one of NANOVG_GL2, NANOVG_GL3, NANOVG_GLES2, NANOVG_GLES3 +#endif + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <math.h> + +#ifdef NANOVG_USE_GLEW +# include <GL/glew.h> +static int glew_initialized = 0; +#endif + +#ifdef NANOVG_GLES2 +# include <GLES2/gl2.h> +# include <GLES2/gl2ext.h> +#endif + +#ifdef NANOVG_GLES3 +# include <GLES3/gl3.h> +#endif + +#if defined(NANOVG_GL2) || defined(NANOVG_GL3) +#include <GL/gl.h> +#endif + +#include "nanovg_gl.h" + +#if defined NANOVG_GL2 +//# define NANOVG_GL2 1 +#elif defined NANOVG_GL3 +//# define NANOVG_GL3 1 +# define NANOVG_GL_USE_UNIFORMBUFFER 1 +#elif defined NANOVG_GLES2 +//# define NANOVG_GLES2 1 +#elif defined NANOVG_GLES3 +//# define NANOVG_GLES3 1 +#endif + +#define NANOVG_GL_USE_STATE_FILTER (1) + +enum GLNVGuniformLoc { + GLNVG_LOC_VIEWSIZE, + GLNVG_LOC_TEX, + GLNVG_LOC_FRAG, + GLNVG_MAX_LOCS +}; + +enum GLNVGshaderType { + NSVG_SHADER_FILLGRAD, + NSVG_SHADER_FILLIMG, + NSVG_SHADER_SIMPLE, + NSVG_SHADER_IMG +}; + +#if NANOVG_GL_USE_UNIFORMBUFFER +enum GLNVGuniformBindings { + GLNVG_FRAG_BINDING = 0, +}; +#endif + +struct GLNVGshader { + GLuint prog; + GLuint frag; + GLuint vert; + GLint loc[GLNVG_MAX_LOCS]; +}; +typedef struct GLNVGshader GLNVGshader; + +struct GLNVGtexture { + int id; + GLuint tex; + int width, height; + int type; + int flags; +}; +typedef struct GLNVGtexture GLNVGtexture; + +struct GLNVGblend +{ + GLenum srcRGB; + GLenum dstRGB; + GLenum srcAlpha; + GLenum dstAlpha; +}; +typedef struct GLNVGblend GLNVGblend; + +enum GLNVGcallType { + GLNVG_NONE = 0, + GLNVG_FILL, + GLNVG_CONVEXFILL, + GLNVG_STROKE, + GLNVG_TRIANGLES, +}; + +struct GLNVGcall { + int type; + int image; + int pathOffset; + int pathCount; + int triangleOffset; + int triangleCount; + int uniformOffset; + GLNVGblend blendFunc; +}; +typedef struct GLNVGcall GLNVGcall; + +struct GLNVGpath { + int fillOffset; + int fillCount; + int strokeOffset; + int strokeCount; +}; +typedef struct GLNVGpath GLNVGpath; + +struct GLNVGfragUniforms { + #if NANOVG_GL_USE_UNIFORMBUFFER + float scissorMat[12]; // matrices are actually 3 vec4s + float paintMat[12]; + struct NVGcolor innerCol; + struct NVGcolor outerCol; + float scissorExt[2]; + float scissorScale[2]; + float extent[2]; + float radius; + float feather; + float strokeMult; + float strokeThr; + int texType; + int type; + #else + // note: after modifying layout or size of uniform array, + // don't forget to also update the fragment shader source! + #define NANOVG_GL_UNIFORMARRAY_SIZE 11 + union { + struct { + float scissorMat[12]; // matrices are actually 3 vec4s + float paintMat[12]; + struct NVGcolor innerCol; + struct NVGcolor outerCol; + float scissorExt[2]; + float scissorScale[2]; + float extent[2]; + float radius; + float feather; + float strokeMult; + float strokeThr; + float texType; + float type; + }; + float uniformArray[NANOVG_GL_UNIFORMARRAY_SIZE][4]; + }; + #endif +}; +typedef struct GLNVGfragUniforms GLNVGfragUniforms; + +struct GLNVGcontext { + GLNVGshader shader; + GLNVGtexture* textures; + float view[2]; + int ntextures; + int ctextures; + int textureId; + GLuint vertBuf; +#if defined NANOVG_GL3 + GLuint vertArr; +#endif +#if NANOVG_GL_USE_UNIFORMBUFFER + GLuint fragBuf; +#endif + int fragSize; + int flags; + + // Per frame buffers + GLNVGcall* calls; + int ccalls; + int ncalls; + GLNVGpath* paths; + int cpaths; + int npaths; + struct NVGvertex* verts; + int cverts; + int nverts; + unsigned char* uniforms; + int cuniforms; + int nuniforms; + + // cached state + #if NANOVG_GL_USE_STATE_FILTER + GLuint boundTexture; + GLuint stencilMask; + GLenum stencilFunc; + GLint stencilFuncRef; + GLuint stencilFuncMask; + GLNVGblend blendFunc; + #endif + + int dummyTex; +}; +typedef struct GLNVGcontext GLNVGcontext; + +static int glnvg__maxi(int a, int b) { return a > b ? a : b; } + +#ifdef NANOVG_GLES2 +static unsigned int glnvg__nearestPow2(unsigned int num) +{ + unsigned n = num > 0 ? num - 1 : 0; + n |= n >> 1; + n |= n >> 2; + n |= n >> 4; + n |= n >> 8; + n |= n >> 16; + n++; + return n; +} +#endif + +static void glnvg__bindTexture(GLNVGcontext* gl, GLuint tex) +{ +#if NANOVG_GL_USE_STATE_FILTER + if (gl->boundTexture != tex) { + gl->boundTexture = tex; + glBindTexture(GL_TEXTURE_2D, tex); + } +#else + glBindTexture(GL_TEXTURE_2D, tex); +#endif +} + +static void glnvg__stencilMask(GLNVGcontext* gl, GLuint mask) +{ +#if NANOVG_GL_USE_STATE_FILTER + if (gl->stencilMask != mask) { + gl->stencilMask = mask; + glStencilMask(mask); + } +#else + glStencilMask(mask); +#endif +} + +static void glnvg__stencilFunc(GLNVGcontext* gl, GLenum func, GLint ref, GLuint mask) +{ +#if NANOVG_GL_USE_STATE_FILTER + if ((gl->stencilFunc != func) || + (gl->stencilFuncRef != ref) || + (gl->stencilFuncMask != mask)) { + + gl->stencilFunc = func; + gl->stencilFuncRef = ref; + gl->stencilFuncMask = mask; + glStencilFunc(func, ref, mask); + } +#else + glStencilFunc(func, ref, mask); +#endif +} +static void glnvg__blendFuncSeparate(GLNVGcontext* gl, const GLNVGblend* blend) +{ +#if NANOVG_GL_USE_STATE_FILTER + if ((gl->blendFunc.srcRGB != blend->srcRGB) || + (gl->blendFunc.dstRGB != blend->dstRGB) || + (gl->blendFunc.srcAlpha != blend->srcAlpha) || + (gl->blendFunc.dstAlpha != blend->dstAlpha)) { + + gl->blendFunc = *blend; + glBlendFuncSeparate(blend->srcRGB, blend->dstRGB, blend->srcAlpha,blend->dstAlpha); + } +#else + glBlendFuncSeparate(blend->srcRGB, blend->dstRGB, blend->srcAlpha,blend->dstAlpha); +#endif +} + +static GLNVGtexture* glnvg__allocTexture(GLNVGcontext* gl) +{ + GLNVGtexture* tex = NULL; + int i; + + for (i = 0; i < gl->ntextures; i++) { + if (gl->textures[i].id == 0) { + tex = &gl->textures[i]; + break; + } + } + if (tex == NULL) { + if (gl->ntextures+1 > gl->ctextures) { + GLNVGtexture* textures; + int ctextures = glnvg__maxi(gl->ntextures+1, 4) + gl->ctextures/2; // 1.5x Overallocate + textures = (GLNVGtexture*)realloc(gl->textures, sizeof(GLNVGtexture)*ctextures); + if (textures == NULL) return NULL; + gl->textures = textures; + gl->ctextures = ctextures; + } + tex = &gl->textures[gl->ntextures++]; + } + + memset(tex, 0, sizeof(*tex)); + tex->id = ++gl->textureId; + + return tex; +} + +static GLNVGtexture* glnvg__findTexture(GLNVGcontext* gl, int id) +{ + int i; + for (i = 0; i < gl->ntextures; i++) + if (gl->textures[i].id == id) + return &gl->textures[i]; + return NULL; +} + +static int glnvg__deleteTexture(GLNVGcontext* gl, int id) +{ + int i; + for (i = 0; i < gl->ntextures; i++) { + if (gl->textures[i].id == id) { + if (gl->textures[i].tex != 0 && (gl->textures[i].flags & NVG_IMAGE_NODELETE) == 0) + glDeleteTextures(1, &gl->textures[i].tex); + memset(&gl->textures[i], 0, sizeof(gl->textures[i])); + return 1; + } + } + return 0; +} + +static void glnvg__dumpShaderError(GLuint shader, const char* name, const char* type) +{ + GLchar str[512+1]; + GLsizei len = 0; + glGetShaderInfoLog(shader, 512, &len, str); + if (len > 512) len = 512; + str[len] = '\0'; + printf("Shader %s/%s error:\n%s\n", name, type, str); +} + +static void glnvg__dumpProgramError(GLuint prog, const char* name) +{ + GLchar str[512+1]; + GLsizei len = 0; + glGetProgramInfoLog(prog, 512, &len, str); + if (len > 512) len = 512; + str[len] = '\0'; + printf("Program %s error:\n%s\n", name, str); +} + +static void glnvg__checkError(GLNVGcontext* gl, const char* str) +{ + GLenum err; + if ((gl->flags & NVG_DEBUG) == 0) return; + err = glGetError(); + if (err != GL_NO_ERROR) { + printf("Error %08x after %s\n", err, str); + return; + } +} + +static int glnvg__createShader(GLNVGshader* shader, const char* name, const char* header, const char* opts, const char* vshader, const char* fshader) +{ + GLint status; + GLuint prog, vert, frag; + const char* str[3]; + str[0] = header; + str[1] = opts != NULL ? opts : ""; + + memset(shader, 0, sizeof(*shader)); + + prog = glCreateProgram(); + vert = glCreateShader(GL_VERTEX_SHADER); + frag = glCreateShader(GL_FRAGMENT_SHADER); + str[2] = vshader; + glShaderSource(vert, 3, str, 0); + str[2] = fshader; + glShaderSource(frag, 3, str, 0); + + glCompileShader(vert); + glGetShaderiv(vert, GL_COMPILE_STATUS, &status); + if (status != GL_TRUE) { + glnvg__dumpShaderError(vert, name, "vert"); + return 0; + } + + glCompileShader(frag); + glGetShaderiv(frag, GL_COMPILE_STATUS, &status); + if (status != GL_TRUE) { + glnvg__dumpShaderError(frag, name, "frag"); + return 0; + } + + glAttachShader(prog, vert); + glAttachShader(prog, frag); + + glBindAttribLocation(prog, 0, "vertex"); + glBindAttribLocation(prog, 1, "tcoord"); + + glLinkProgram(prog); + glGetProgramiv(prog, GL_LINK_STATUS, &status); + if (status != GL_TRUE) { + glnvg__dumpProgramError(prog, name); + return 0; + } + + shader->prog = prog; + shader->vert = vert; + shader->frag = frag; + + return 1; +} + +static void glnvg__deleteShader(GLNVGshader* shader) +{ + if (shader->prog != 0) + glDeleteProgram(shader->prog); + if (shader->vert != 0) + glDeleteShader(shader->vert); + if (shader->frag != 0) + glDeleteShader(shader->frag); +} + +static void glnvg__getUniforms(GLNVGshader* shader) +{ + shader->loc[GLNVG_LOC_VIEWSIZE] = glGetUniformLocation(shader->prog, "viewSize"); + shader->loc[GLNVG_LOC_TEX] = glGetUniformLocation(shader->prog, "tex"); + +#if NANOVG_GL_USE_UNIFORMBUFFER + shader->loc[GLNVG_LOC_FRAG] = glGetUniformBlockIndex(shader->prog, "frag"); +#else + shader->loc[GLNVG_LOC_FRAG] = glGetUniformLocation(shader->prog, "frag"); +#endif +} + +static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, int imageFlags, const unsigned char* data); + +static int glnvg__renderCreate(void* uptr) +{ + GLNVGcontext* gl = (GLNVGcontext*)uptr; + int align = 4; + + // TODO: mediump float may not be enough for GLES2 in iOS. + // see the following discussion: https://github.com/memononen/nanovg/issues/46 + static const char* shaderHeader = +#if defined NANOVG_GL2 + "#define NANOVG_GL2 1\n" +#elif defined NANOVG_GL3 + "#version 150 core\n" + "#define NANOVG_GL3 1\n" +#elif defined NANOVG_GLES2 + "#version 100\n" + "#define NANOVG_GL2 1\n" +#elif defined NANOVG_GLES3 + "#version 300 es\n" + "#define NANOVG_GL3 1\n" +#endif + +#if NANOVG_GL_USE_UNIFORMBUFFER + "#define USE_UNIFORMBUFFER 1\n" +#else + "#define UNIFORMARRAY_SIZE 11\n" +#endif + "\n"; + + static const char* fillVertShader = + "#ifdef NANOVG_GL3\n" + " uniform vec2 viewSize;\n" + " in vec2 vertex;\n" + " in vec2 tcoord;\n" + " out vec2 ftcoord;\n" + " out vec2 fpos;\n" + "#else\n" + " uniform vec2 viewSize;\n" + " attribute vec2 vertex;\n" + " attribute vec2 tcoord;\n" + " varying vec2 ftcoord;\n" + " varying vec2 fpos;\n" + "#endif\n" + "void main(void) {\n" + " ftcoord = tcoord;\n" + " fpos = vertex;\n" + " gl_Position = vec4(2.0*vertex.x/viewSize.x - 1.0, 1.0 - 2.0*vertex.y/viewSize.y, 0, 1);\n" + "}\n"; + + static const char* fillFragShader = + "#ifdef GL_ES\n" + "#if defined(GL_FRAGMENT_PRECISION_HIGH) || defined(NANOVG_GL3)\n" + " precision highp float;\n" + "#else\n" + " precision mediump float;\n" + "#endif\n" + "#endif\n" + "#ifdef NANOVG_GL3\n" + "#ifdef USE_UNIFORMBUFFER\n" + " layout(std140) uniform frag {\n" + " mat3 scissorMat;\n" + " mat3 paintMat;\n" + " vec4 innerCol;\n" + " vec4 outerCol;\n" + " vec2 scissorExt;\n" + " vec2 scissorScale;\n" + " vec2 extent;\n" + " float radius;\n" + " float feather;\n" + " float strokeMult;\n" + " float strokeThr;\n" + " int texType;\n" + " int type;\n" + " };\n" + "#else\n" // NANOVG_GL3 && !USE_UNIFORMBUFFER + " uniform vec4 frag[UNIFORMARRAY_SIZE];\n" + "#endif\n" + " uniform sampler2D tex;\n" + " in vec2 ftcoord;\n" + " in vec2 fpos;\n" + " out vec4 outColor;\n" + "#else\n" // !NANOVG_GL3 + " uniform vec4 frag[UNIFORMARRAY_SIZE];\n" + " uniform sampler2D tex;\n" + " varying vec2 ftcoord;\n" + " varying vec2 fpos;\n" + "#endif\n" + "#ifndef USE_UNIFORMBUFFER\n" + " #define scissorMat mat3(frag[0].xyz, frag[1].xyz, frag[2].xyz)\n" + " #define paintMat mat3(frag[3].xyz, frag[4].xyz, frag[5].xyz)\n" + " #define innerCol frag[6]\n" + " #define outerCol frag[7]\n" + " #define scissorExt frag[8].xy\n" + " #define scissorScale frag[8].zw\n" + " #define extent frag[9].xy\n" + " #define radius frag[9].z\n" + " #define feather frag[9].w\n" + " #define strokeMult frag[10].x\n" + " #define strokeThr frag[10].y\n" + " #define texType int(frag[10].z)\n" + " #define type int(frag[10].w)\n" + "#endif\n" + "\n" + "float sdroundrect(vec2 pt, vec2 ext, float rad) {\n" + " vec2 ext2 = ext - vec2(rad,rad);\n" + " vec2 d = abs(pt) - ext2;\n" + " return min(max(d.x,d.y),0.0) + length(max(d,0.0)) - rad;\n" + "}\n" + "\n" + "// Scissoring\n" + "float scissorMask(vec2 p) {\n" + " vec2 sc = (abs((scissorMat * vec3(p,1.0)).xy) - scissorExt);\n" + " sc = vec2(0.5,0.5) - sc * scissorScale;\n" + " return clamp(sc.x,0.0,1.0) * clamp(sc.y,0.0,1.0);\n" + "}\n" + "#ifdef EDGE_AA\n" + "// Stroke - from [0..1] to clipped pyramid, where the slope is 1px.\n" + "float strokeMask() {\n" + " return min(1.0, (1.0-abs(ftcoord.x*2.0-1.0))*strokeMult) * min(1.0, ftcoord.y);\n" + "}\n" + "#endif\n" + "\n" + "void main(void) {\n" + " vec4 result;\n" + " float scissor = scissorMask(fpos);\n" + "#ifdef EDGE_AA\n" + " float strokeAlpha = strokeMask();\n" + " if (strokeAlpha < strokeThr) discard;\n" + "#else\n" + " float strokeAlpha = 1.0;\n" + "#endif\n" + " if (type == 0) { // Gradient\n" + " // Calculate gradient color using box gradient\n" + " vec2 pt = (paintMat * vec3(fpos,1.0)).xy;\n" + " float d = clamp((sdroundrect(pt, extent, radius) + feather*0.5) / feather, 0.0, 1.0);\n" + " vec4 color = mix(innerCol,outerCol,d);\n" + " // Combine alpha\n" + " color *= strokeAlpha * scissor;\n" + " result = color;\n" + " } else if (type == 1) { // Image\n" + " // Calculate color fron texture\n" + " vec2 pt = (paintMat * vec3(fpos,1.0)).xy / extent;\n" + "#ifdef NANOVG_GL3\n" + " vec4 color = texture(tex, pt);\n" + "#else\n" + " vec4 color = texture2D(tex, pt);\n" + "#endif\n" + " if (texType == 1) color = vec4(color.xyz*color.w,color.w);" + " if (texType == 2) color = vec4(color.x);" + " // Apply color tint and alpha.\n" + " color *= innerCol;\n" + " // Combine alpha\n" + " color *= strokeAlpha * scissor;\n" + " result = color;\n" + " } else if (type == 2) { // Stencil fill\n" + " result = vec4(1,1,1,1);\n" + " } else if (type == 3) { // Textured tris\n" + "#ifdef NANOVG_GL3\n" + " vec4 color = texture(tex, ftcoord);\n" + "#else\n" + " vec4 color = texture2D(tex, ftcoord);\n" + "#endif\n" + " if (texType == 1) color = vec4(color.xyz*color.w,color.w);" + " if (texType == 2) color = vec4(color.x);" + " color *= scissor;\n" + " result = color * innerCol;\n" + " }\n" + "#ifdef NANOVG_GL3\n" + " outColor = result;\n" + "#else\n" + " gl_FragColor = result;\n" + "#endif\n" + "}\n"; + + glnvg__checkError(gl, "init"); + + if (gl->flags & NVG_ANTIALIAS) { + if (glnvg__createShader(&gl->shader, "shader", shaderHeader, "#define EDGE_AA 1\n", fillVertShader, fillFragShader) == 0) + return 0; + } else { + if (glnvg__createShader(&gl->shader, "shader", shaderHeader, NULL, fillVertShader, fillFragShader) == 0) + return 0; + } + + glnvg__checkError(gl, "uniform locations"); + glnvg__getUniforms(&gl->shader); + + // Create dynamic vertex array +#if defined NANOVG_GL3 + glGenVertexArrays(1, &gl->vertArr); +#endif + glGenBuffers(1, &gl->vertBuf); + +#if NANOVG_GL_USE_UNIFORMBUFFER + // Create UBOs + glUniformBlockBinding(gl->shader.prog, gl->shader.loc[GLNVG_LOC_FRAG], GLNVG_FRAG_BINDING); + glGenBuffers(1, &gl->fragBuf); + glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &align); +#endif + gl->fragSize = sizeof(GLNVGfragUniforms) + align - sizeof(GLNVGfragUniforms) % align; + + // Some platforms does not allow to have samples to unset textures. + // Create empty one which is bound when there's no texture specified. + gl->dummyTex = glnvg__renderCreateTexture(gl, NVG_TEXTURE_ALPHA, 1, 1, 0, NULL); + + glnvg__checkError(gl, "create done"); + + glFinish(); + + return 1; +} + +static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, int imageFlags, const unsigned char* data) +{ + GLNVGcontext* gl = (GLNVGcontext*)uptr; + GLNVGtexture* tex = glnvg__allocTexture(gl); + + if (tex == NULL) return 0; + +#ifdef NANOVG_GLES2 + // Check for non-power of 2. + if (glnvg__nearestPow2(w) != (unsigned int)w || glnvg__nearestPow2(h) != (unsigned int)h) { + // No repeat + if ((imageFlags & NVG_IMAGE_REPEATX) != 0 || (imageFlags & NVG_IMAGE_REPEATY) != 0) { + printf("Repeat X/Y is not supported for non power-of-two textures (%d x %d)\n", w, h); + imageFlags &= ~(NVG_IMAGE_REPEATX | NVG_IMAGE_REPEATY); + } + // No mips. + if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) { + printf("Mip-maps is not support for non power-of-two textures (%d x %d)\n", w, h); + imageFlags &= ~NVG_IMAGE_GENERATE_MIPMAPS; + } + } +#endif + + glGenTextures(1, &tex->tex); + tex->width = w; + tex->height = h; + tex->type = type; + tex->flags = imageFlags; + glnvg__bindTexture(gl, tex->tex); + + glPixelStorei(GL_UNPACK_ALIGNMENT,1); +#ifndef NANOVG_GLES2 + glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width); + glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0); + glPixelStorei(GL_UNPACK_SKIP_ROWS, 0); +#endif + +#if defined (NANOVG_GL2) + // GL 1.4 and later has support for generating mipmaps using a tex parameter. + if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) { + glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE); + } +#endif + + if (type == NVG_TEXTURE_RGBA) + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data); + else +#if defined(NANOVG_GLES2) || defined (NANOVG_GL2) + glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, w, h, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data); +#elif defined(NANOVG_GLES3) + glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, data); +#else + glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, data); +#endif + + if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) { + if (imageFlags & NVG_IMAGE_NEAREST) { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST); + } else { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); + } + } else { + if (imageFlags & NVG_IMAGE_NEAREST) { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + } else { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + } + } + + if (imageFlags & NVG_IMAGE_NEAREST) { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + } else { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + } + + if (imageFlags & NVG_IMAGE_REPEATX) + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + else + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + + if (imageFlags & NVG_IMAGE_REPEATY) + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); + else + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + + glPixelStorei(GL_UNPACK_ALIGNMENT, 4); +#ifndef NANOVG_GLES2 + glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); + glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0); + glPixelStorei(GL_UNPACK_SKIP_ROWS, 0); +#endif + + // The new way to build mipmaps on GLES and GL3 +#if !defined(NANOVG_GL2) + if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) { + glGenerateMipmap(GL_TEXTURE_2D); + } +#endif + + glnvg__checkError(gl, "create tex"); + glnvg__bindTexture(gl, 0); + + return tex->id; +} + + +static int glnvg__renderDeleteTexture(void* uptr, int image) +{ + GLNVGcontext* gl = (GLNVGcontext*)uptr; + return glnvg__deleteTexture(gl, image); +} + +static int glnvg__renderUpdateTexture(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data) +{ + GLNVGcontext* gl = (GLNVGcontext*)uptr; + GLNVGtexture* tex = glnvg__findTexture(gl, image); + + if (tex == NULL) return 0; + glnvg__bindTexture(gl, tex->tex); + + glPixelStorei(GL_UNPACK_ALIGNMENT,1); + +#ifndef NANOVG_GLES2 + glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width); + glPixelStorei(GL_UNPACK_SKIP_PIXELS, x); + glPixelStorei(GL_UNPACK_SKIP_ROWS, y); +#else + // No support for all of skip, need to update a whole row at a time. + if (tex->type == NVG_TEXTURE_RGBA) + data += y*tex->width*4; + else + data += y*tex->width; + x = 0; + w = tex->width; +#endif + + if (tex->type == NVG_TEXTURE_RGBA) + glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RGBA, GL_UNSIGNED_BYTE, data); + else +#if defined(NANOVG_GLES2) || defined(NANOVG_GL2) + glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_LUMINANCE, GL_UNSIGNED_BYTE, data); +#else + glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RED, GL_UNSIGNED_BYTE, data); +#endif + + glPixelStorei(GL_UNPACK_ALIGNMENT, 4); +#ifndef NANOVG_GLES2 + glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); + glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0); + glPixelStorei(GL_UNPACK_SKIP_ROWS, 0); +#endif + + glnvg__bindTexture(gl, 0); + + return 1; +} + +static int glnvg__renderGetTextureSize(void* uptr, int image, int* w, int* h) +{ + GLNVGcontext* gl = (GLNVGcontext*)uptr; + GLNVGtexture* tex = glnvg__findTexture(gl, image); + if (tex == NULL) return 0; + *w = tex->width; + *h = tex->height; + return 1; +} + +static void glnvg__xformToMat3x4(float* m3, float* t) +{ + m3[0] = t[0]; + m3[1] = t[1]; + m3[2] = 0.0f; + m3[3] = 0.0f; + m3[4] = t[2]; + m3[5] = t[3]; + m3[6] = 0.0f; + m3[7] = 0.0f; + m3[8] = t[4]; + m3[9] = t[5]; + m3[10] = 1.0f; + m3[11] = 0.0f; +} + +static NVGcolor glnvg__premulColor(NVGcolor c) +{ + c.r *= c.a; + c.g *= c.a; + c.b *= c.a; + return c; +} + +static int glnvg__convertPaint(GLNVGcontext* gl, GLNVGfragUniforms* frag, NVGpaint* paint, + NVGscissor* scissor, float width, float fringe, float strokeThr) +{ + GLNVGtexture* tex = NULL; + float invxform[6]; + + memset(frag, 0, sizeof(*frag)); + + frag->innerCol = glnvg__premulColor(paint->innerColor); + frag->outerCol = glnvg__premulColor(paint->outerColor); + + if (scissor->extent[0] < -0.5f || scissor->extent[1] < -0.5f) { + memset(frag->scissorMat, 0, sizeof(frag->scissorMat)); + frag->scissorExt[0] = 1.0f; + frag->scissorExt[1] = 1.0f; + frag->scissorScale[0] = 1.0f; + frag->scissorScale[1] = 1.0f; + } else { + nvgTransformInverse(invxform, scissor->xform); + glnvg__xformToMat3x4(frag->scissorMat, invxform); + frag->scissorExt[0] = scissor->extent[0]; + frag->scissorExt[1] = scissor->extent[1]; + frag->scissorScale[0] = sqrtf(scissor->xform[0]*scissor->xform[0] + scissor->xform[2]*scissor->xform[2]) / fringe; + frag->scissorScale[1] = sqrtf(scissor->xform[1]*scissor->xform[1] + scissor->xform[3]*scissor->xform[3]) / fringe; + } + + memcpy(frag->extent, paint->extent, sizeof(frag->extent)); + frag->strokeMult = (width*0.5f + fringe*0.5f) / fringe; + frag->strokeThr = strokeThr; + + if (paint->image != 0) { + tex = glnvg__findTexture(gl, paint->image); + if (tex == NULL) return 0; + if ((tex->flags & NVG_IMAGE_FLIPY) != 0) { + float m1[6], m2[6]; + nvgTransformTranslate(m1, 0.0f, frag->extent[1] * 0.5f); + nvgTransformMultiply(m1, paint->xform); + nvgTransformScale(m2, 1.0f, -1.0f); + nvgTransformMultiply(m2, m1); + nvgTransformTranslate(m1, 0.0f, -frag->extent[1] * 0.5f); + nvgTransformMultiply(m1, m2); + nvgTransformInverse(invxform, m1); + } else { + nvgTransformInverse(invxform, paint->xform); + } + frag->type = NSVG_SHADER_FILLIMG; + + #if NANOVG_GL_USE_UNIFORMBUFFER + if (tex->type == NVG_TEXTURE_RGBA) + frag->texType = (tex->flags & NVG_IMAGE_PREMULTIPLIED) ? 0 : 1; + else + frag->texType = 2; + #else + if (tex->type == NVG_TEXTURE_RGBA) + frag->texType = (tex->flags & NVG_IMAGE_PREMULTIPLIED) ? 0.0f : 1.0f; + else + frag->texType = 2.0f; + #endif +// printf("frag->texType = %d\n", frag->texType); + } else { + frag->type = NSVG_SHADER_FILLGRAD; + frag->radius = paint->radius; + frag->feather = paint->feather; + nvgTransformInverse(invxform, paint->xform); + } + + glnvg__xformToMat3x4(frag->paintMat, invxform); + + return 1; +} + +static GLNVGfragUniforms* nvg__fragUniformPtr(GLNVGcontext* gl, int i); + +static void glnvg__setUniforms(GLNVGcontext* gl, int uniformOffset, int image) +{ + GLNVGtexture* tex = NULL; +#if NANOVG_GL_USE_UNIFORMBUFFER + glBindBufferRange(GL_UNIFORM_BUFFER, GLNVG_FRAG_BINDING, gl->fragBuf, uniformOffset, sizeof(GLNVGfragUniforms)); +#else + GLNVGfragUniforms* frag = nvg__fragUniformPtr(gl, uniformOffset); + glUniform4fv(gl->shader.loc[GLNVG_LOC_FRAG], NANOVG_GL_UNIFORMARRAY_SIZE, &(frag->uniformArray[0][0])); +#endif + + if (image != 0) { + tex = glnvg__findTexture(gl, image); + } + // If no image is set, use empty texture + if (tex == NULL) { + tex = glnvg__findTexture(gl, gl->dummyTex); + } + glnvg__bindTexture(gl, tex != NULL ? tex->tex : 0); + glnvg__checkError(gl, "tex paint tex"); +} + +static void glnvg__renderViewport(void* uptr, float width, float height, float devicePixelRatio) +{ + NVG_NOTUSED(devicePixelRatio); + GLNVGcontext* gl = (GLNVGcontext*)uptr; + gl->view[0] = width; + gl->view[1] = height; +} + +static void glnvg__fill(GLNVGcontext* gl, GLNVGcall* call) +{ + GLNVGpath* paths = &gl->paths[call->pathOffset]; + int i, npaths = call->pathCount; + + // Draw shapes + glEnable(GL_STENCIL_TEST); + glnvg__stencilMask(gl, 0xff); + glnvg__stencilFunc(gl, GL_ALWAYS, 0, 0xff); + glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); + + // set bindpoint for solid loc + glnvg__setUniforms(gl, call->uniformOffset, 0); + glnvg__checkError(gl, "fill simple"); + + glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR_WRAP); + glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR_WRAP); + glDisable(GL_CULL_FACE); + for (i = 0; i < npaths; i++) + glDrawArrays(GL_TRIANGLE_FAN, paths[i].fillOffset, paths[i].fillCount); + glEnable(GL_CULL_FACE); + + // Draw anti-aliased pixels + glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); + + glnvg__setUniforms(gl, call->uniformOffset + gl->fragSize, call->image); + glnvg__checkError(gl, "fill fill"); + + if (gl->flags & NVG_ANTIALIAS) { + glnvg__stencilFunc(gl, GL_EQUAL, 0x00, 0xff); + glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); + // Draw fringes + for (i = 0; i < npaths; i++) + glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); + } + + // Draw fill + glnvg__stencilFunc(gl, GL_NOTEQUAL, 0x0, 0xff); + glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO); + glDrawArrays(GL_TRIANGLE_STRIP, call->triangleOffset, call->triangleCount); + + glDisable(GL_STENCIL_TEST); +} + +static void glnvg__convexFill(GLNVGcontext* gl, GLNVGcall* call) +{ + GLNVGpath* paths = &gl->paths[call->pathOffset]; + int i, npaths = call->pathCount; + + glnvg__setUniforms(gl, call->uniformOffset, call->image); + glnvg__checkError(gl, "convex fill"); + + for (i = 0; i < npaths; i++) { + glDrawArrays(GL_TRIANGLE_FAN, paths[i].fillOffset, paths[i].fillCount); + // Draw fringes + if (paths[i].strokeCount > 0) { + glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); + } + } +} + +static void glnvg__stroke(GLNVGcontext* gl, GLNVGcall* call) +{ + GLNVGpath* paths = &gl->paths[call->pathOffset]; + int npaths = call->pathCount, i; + + if (gl->flags & NVG_STENCIL_STROKES) { + + glEnable(GL_STENCIL_TEST); + glnvg__stencilMask(gl, 0xff); + + // Fill the stroke base without overlap + glnvg__stencilFunc(gl, GL_EQUAL, 0x0, 0xff); + glStencilOp(GL_KEEP, GL_KEEP, GL_INCR); + glnvg__setUniforms(gl, call->uniformOffset + gl->fragSize, call->image); + glnvg__checkError(gl, "stroke fill 0"); + for (i = 0; i < npaths; i++) + glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); + + // Draw anti-aliased pixels. + glnvg__setUniforms(gl, call->uniformOffset, call->image); + glnvg__stencilFunc(gl, GL_EQUAL, 0x00, 0xff); + glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); + for (i = 0; i < npaths; i++) + glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); + + // Clear stencil buffer. + glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); + glnvg__stencilFunc(gl, GL_ALWAYS, 0x0, 0xff); + glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO); + glnvg__checkError(gl, "stroke fill 1"); + for (i = 0; i < npaths; i++) + glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); + glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); + + glDisable(GL_STENCIL_TEST); + +// glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, strokeWidth, fringe, 1.0f - 0.5f/255.0f); + + } else { + glnvg__setUniforms(gl, call->uniformOffset, call->image); + glnvg__checkError(gl, "stroke fill"); + // Draw Strokes + for (i = 0; i < npaths; i++) + glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount); + } +} + +static void glnvg__triangles(GLNVGcontext* gl, GLNVGcall* call) +{ + glnvg__setUniforms(gl, call->uniformOffset, call->image); + glnvg__checkError(gl, "triangles fill"); + + glDrawArrays(GL_TRIANGLES, call->triangleOffset, call->triangleCount); +} + +static void glnvg__renderCancel(void* uptr) { + GLNVGcontext* gl = (GLNVGcontext*)uptr; + gl->nverts = 0; + gl->npaths = 0; + gl->ncalls = 0; + gl->nuniforms = 0; +} + +static GLenum glnvg_convertBlendFuncFactor(int factor) +{ + if (factor == NVG_ZERO) + return GL_ZERO; + if (factor == NVG_ONE) + return GL_ONE; + if (factor == NVG_SRC_COLOR) + return GL_SRC_COLOR; + if (factor == NVG_ONE_MINUS_SRC_COLOR) + return GL_ONE_MINUS_SRC_COLOR; + if (factor == NVG_DST_COLOR) + return GL_DST_COLOR; + if (factor == NVG_ONE_MINUS_DST_COLOR) + return GL_ONE_MINUS_DST_COLOR; + if (factor == NVG_SRC_ALPHA) + return GL_SRC_ALPHA; + if (factor == NVG_ONE_MINUS_SRC_ALPHA) + return GL_ONE_MINUS_SRC_ALPHA; + if (factor == NVG_DST_ALPHA) + return GL_DST_ALPHA; + if (factor == NVG_ONE_MINUS_DST_ALPHA) + return GL_ONE_MINUS_DST_ALPHA; + if (factor == NVG_SRC_ALPHA_SATURATE) + return GL_SRC_ALPHA_SATURATE; + return GL_INVALID_ENUM; +} + +static GLNVGblend glnvg__blendCompositeOperation(NVGcompositeOperationState op) +{ + GLNVGblend blend; + blend.srcRGB = glnvg_convertBlendFuncFactor(op.srcRGB); + blend.dstRGB = glnvg_convertBlendFuncFactor(op.dstRGB); + blend.srcAlpha = glnvg_convertBlendFuncFactor(op.srcAlpha); + blend.dstAlpha = glnvg_convertBlendFuncFactor(op.dstAlpha); + if (blend.srcRGB == GL_INVALID_ENUM || blend.dstRGB == GL_INVALID_ENUM || blend.srcAlpha == GL_INVALID_ENUM || blend.dstAlpha == GL_INVALID_ENUM) + { + blend.srcRGB = GL_ONE; + blend.dstRGB = GL_ONE_MINUS_SRC_ALPHA; + blend.srcAlpha = GL_ONE; + blend.dstAlpha = GL_ONE_MINUS_SRC_ALPHA; + } + return blend; +} + +static void glnvg__renderFlush(void* uptr) +{ + GLNVGcontext* gl = (GLNVGcontext*)uptr; + int i; + + if (gl->ncalls > 0) { + + // Setup require GL state. + glUseProgram(gl->shader.prog); + + glEnable(GL_CULL_FACE); + glCullFace(GL_BACK); + glFrontFace(GL_CCW); + glEnable(GL_BLEND); + glDisable(GL_DEPTH_TEST); + glDisable(GL_SCISSOR_TEST); + glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); + glStencilMask(0xffffffff); + glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); + glStencilFunc(GL_ALWAYS, 0, 0xffffffff); + glActiveTexture(GL_TEXTURE0); + glBindTexture(GL_TEXTURE_2D, 0); + #if NANOVG_GL_USE_STATE_FILTER + gl->boundTexture = 0; + gl->stencilMask = 0xffffffff; + gl->stencilFunc = GL_ALWAYS; + gl->stencilFuncRef = 0; + gl->stencilFuncMask = 0xffffffff; + gl->blendFunc.srcRGB = GL_INVALID_ENUM; + gl->blendFunc.srcAlpha = GL_INVALID_ENUM; + gl->blendFunc.dstRGB = GL_INVALID_ENUM; + gl->blendFunc.dstAlpha = GL_INVALID_ENUM; + #endif + +#if NANOVG_GL_USE_UNIFORMBUFFER + // Upload ubo for frag shaders + glBindBuffer(GL_UNIFORM_BUFFER, gl->fragBuf); + glBufferData(GL_UNIFORM_BUFFER, gl->nuniforms * gl->fragSize, gl->uniforms, GL_STREAM_DRAW); +#endif + + // Upload vertex data +#if defined NANOVG_GL3 + glBindVertexArray(gl->vertArr); +#endif + glBindBuffer(GL_ARRAY_BUFFER, gl->vertBuf); + glBufferData(GL_ARRAY_BUFFER, gl->nverts * sizeof(NVGvertex), gl->verts, GL_STREAM_DRAW); + glEnableVertexAttribArray(0); + glEnableVertexAttribArray(1); + glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(NVGvertex), (const GLvoid*)(size_t)0); + glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(NVGvertex), (const GLvoid*)(0 + 2*sizeof(float))); + + // Set view and texture just once per frame. + glUniform1i(gl->shader.loc[GLNVG_LOC_TEX], 0); + glUniform2fv(gl->shader.loc[GLNVG_LOC_VIEWSIZE], 1, gl->view); + +#if NANOVG_GL_USE_UNIFORMBUFFER + glBindBuffer(GL_UNIFORM_BUFFER, gl->fragBuf); +#endif + + for (i = 0; i < gl->ncalls; i++) { + GLNVGcall* call = &gl->calls[i]; + glnvg__blendFuncSeparate(gl,&call->blendFunc); + if (call->type == GLNVG_FILL) + glnvg__fill(gl, call); + else if (call->type == GLNVG_CONVEXFILL) + glnvg__convexFill(gl, call); + else if (call->type == GLNVG_STROKE) + glnvg__stroke(gl, call); + else if (call->type == GLNVG_TRIANGLES) + glnvg__triangles(gl, call); + } + + glDisableVertexAttribArray(0); + glDisableVertexAttribArray(1); +#if defined NANOVG_GL3 + glBindVertexArray(0); +#endif + glDisable(GL_CULL_FACE); + glBindBuffer(GL_ARRAY_BUFFER, 0); + glUseProgram(0); + glnvg__bindTexture(gl, 0); + } + + // Reset calls + gl->nverts = 0; + gl->npaths = 0; + gl->ncalls = 0; + gl->nuniforms = 0; +} + +static int glnvg__maxVertCount(const NVGpath* paths, int npaths) +{ + int i, count = 0; + for (i = 0; i < npaths; i++) { + count += paths[i].nfill; + count += paths[i].nstroke; + } + return count; +} + +static GLNVGcall* glnvg__allocCall(GLNVGcontext* gl) +{ + GLNVGcall* ret = NULL; + if (gl->ncalls+1 > gl->ccalls) { + GLNVGcall* calls; + int ccalls = glnvg__maxi(gl->ncalls+1, 128) + gl->ccalls/2; // 1.5x Overallocate + calls = (GLNVGcall*)realloc(gl->calls, sizeof(GLNVGcall) * ccalls); + if (calls == NULL) return NULL; + gl->calls = calls; + gl->ccalls = ccalls; + } + ret = &gl->calls[gl->ncalls++]; + memset(ret, 0, sizeof(GLNVGcall)); + return ret; +} + +static int glnvg__allocPaths(GLNVGcontext* gl, int n) +{ + int ret = 0; + if (gl->npaths+n > gl->cpaths) { + GLNVGpath* paths; + int cpaths = glnvg__maxi(gl->npaths + n, 128) + gl->cpaths/2; // 1.5x Overallocate + paths = (GLNVGpath*)realloc(gl->paths, sizeof(GLNVGpath) * cpaths); + if (paths == NULL) return -1; + gl->paths = paths; + gl->cpaths = cpaths; + } + ret = gl->npaths; + gl->npaths += n; + return ret; +} + +static int glnvg__allocVerts(GLNVGcontext* gl, int n) +{ + int ret = 0; + if (gl->nverts+n > gl->cverts) { + NVGvertex* verts; + int cverts = glnvg__maxi(gl->nverts + n, 4096) + gl->cverts/2; // 1.5x Overallocate + verts = (NVGvertex*)realloc(gl->verts, sizeof(NVGvertex) * cverts); + if (verts == NULL) return -1; + gl->verts = verts; + gl->cverts = cverts; + } + ret = gl->nverts; + gl->nverts += n; + return ret; +} + +static int glnvg__allocFragUniforms(GLNVGcontext* gl, int n) +{ + int ret = 0, structSize = gl->fragSize; + if (gl->nuniforms+n > gl->cuniforms) { + unsigned char* uniforms; + int cuniforms = glnvg__maxi(gl->nuniforms+n, 128) + gl->cuniforms/2; // 1.5x Overallocate + uniforms = (unsigned char*)realloc(gl->uniforms, structSize * cuniforms); + if (uniforms == NULL) return -1; + gl->uniforms = uniforms; + gl->cuniforms = cuniforms; + } + ret = gl->nuniforms * structSize; + gl->nuniforms += n; + return ret; +} + +static GLNVGfragUniforms* nvg__fragUniformPtr(GLNVGcontext* gl, int i) +{ + return (GLNVGfragUniforms*)&gl->uniforms[i]; +} + +static void glnvg__vset(NVGvertex* vtx, float x, float y, float u, float v) +{ + vtx->x = x; + vtx->y = y; + vtx->u = u; + vtx->v = v; +} + +static void glnvg__renderFill(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe, + const float* bounds, const NVGpath* paths, int npaths) +{ + GLNVGcontext* gl = (GLNVGcontext*)uptr; + GLNVGcall* call = glnvg__allocCall(gl); + NVGvertex* quad; + GLNVGfragUniforms* frag; + int i, maxverts, offset; + + if (call == NULL) return; + + call->type = GLNVG_FILL; + call->triangleCount = 4; + call->pathOffset = glnvg__allocPaths(gl, npaths); + if (call->pathOffset == -1) goto error; + call->pathCount = npaths; + call->image = paint->image; + call->blendFunc = glnvg__blendCompositeOperation(compositeOperation); + + if (npaths == 1 && paths[0].convex) + { + call->type = GLNVG_CONVEXFILL; + call->triangleCount = 0; // Bounding box fill quad not needed for convex fill + } + + // Allocate vertices for all the paths. + maxverts = glnvg__maxVertCount(paths, npaths) + call->triangleCount; + offset = glnvg__allocVerts(gl, maxverts); + if (offset == -1) goto error; + + for (i = 0; i < npaths; i++) { + GLNVGpath* copy = &gl->paths[call->pathOffset + i]; + const NVGpath* path = &paths[i]; + memset(copy, 0, sizeof(GLNVGpath)); + if (path->nfill > 0) { + copy->fillOffset = offset; + copy->fillCount = path->nfill; + memcpy(&gl->verts[offset], path->fill, sizeof(NVGvertex) * path->nfill); + offset += path->nfill; + } + if (path->nstroke > 0) { + copy->strokeOffset = offset; + copy->strokeCount = path->nstroke; + memcpy(&gl->verts[offset], path->stroke, sizeof(NVGvertex) * path->nstroke); + offset += path->nstroke; + } + } + + // Setup uniforms for draw calls + if (call->type == GLNVG_FILL) { + // Quad + call->triangleOffset = offset; + quad = &gl->verts[call->triangleOffset]; + glnvg__vset(&quad[0], bounds[2], bounds[3], 0.5f, 1.0f); + glnvg__vset(&quad[1], bounds[2], bounds[1], 0.5f, 1.0f); + glnvg__vset(&quad[2], bounds[0], bounds[3], 0.5f, 1.0f); + glnvg__vset(&quad[3], bounds[0], bounds[1], 0.5f, 1.0f); + + call->uniformOffset = glnvg__allocFragUniforms(gl, 2); + if (call->uniformOffset == -1) goto error; + // Simple shader for stencil + frag = nvg__fragUniformPtr(gl, call->uniformOffset); + memset(frag, 0, sizeof(*frag)); + frag->strokeThr = -1.0f; + frag->type = NSVG_SHADER_SIMPLE; + // Fill shader + glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, fringe, fringe, -1.0f); + } else { + call->uniformOffset = glnvg__allocFragUniforms(gl, 1); + if (call->uniformOffset == -1) goto error; + // Fill shader + glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, fringe, fringe, -1.0f); + } + + return; + +error: + // We get here if call alloc was ok, but something else is not. + // Roll back the last call to prevent drawing it. + if (gl->ncalls > 0) gl->ncalls--; +} + +static void glnvg__renderStroke(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe, + float strokeWidth, const NVGpath* paths, int npaths) +{ + GLNVGcontext* gl = (GLNVGcontext*)uptr; + GLNVGcall* call = glnvg__allocCall(gl); + int i, maxverts, offset; + + if (call == NULL) return; + + call->type = GLNVG_STROKE; + call->pathOffset = glnvg__allocPaths(gl, npaths); + if (call->pathOffset == -1) goto error; + call->pathCount = npaths; + call->image = paint->image; + call->blendFunc = glnvg__blendCompositeOperation(compositeOperation); + + // Allocate vertices for all the paths. + maxverts = glnvg__maxVertCount(paths, npaths); + offset = glnvg__allocVerts(gl, maxverts); + if (offset == -1) goto error; + + for (i = 0; i < npaths; i++) { + GLNVGpath* copy = &gl->paths[call->pathOffset + i]; + const NVGpath* path = &paths[i]; + memset(copy, 0, sizeof(GLNVGpath)); + if (path->nstroke) { + copy->strokeOffset = offset; + copy->strokeCount = path->nstroke; + memcpy(&gl->verts[offset], path->stroke, sizeof(NVGvertex) * path->nstroke); + offset += path->nstroke; + } + } + + if (gl->flags & NVG_STENCIL_STROKES) { + // Fill shader + call->uniformOffset = glnvg__allocFragUniforms(gl, 2); + if (call->uniformOffset == -1) goto error; + + glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, strokeWidth, fringe, -1.0f); + glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, strokeWidth, fringe, 1.0f - 0.5f/255.0f); + + } else { + // Fill shader + call->uniformOffset = glnvg__allocFragUniforms(gl, 1); + if (call->uniformOffset == -1) goto error; + glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, strokeWidth, fringe, -1.0f); + } + + return; + +error: + // We get here if call alloc was ok, but something else is not. + // Roll back the last call to prevent drawing it. + if (gl->ncalls > 0) gl->ncalls--; +} + +static void glnvg__renderTriangles(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, + const NVGvertex* verts, int nverts, float fringe) +{ + GLNVGcontext* gl = (GLNVGcontext*)uptr; + GLNVGcall* call = glnvg__allocCall(gl); + GLNVGfragUniforms* frag; + + if (call == NULL) return; + + call->type = GLNVG_TRIANGLES; + call->image = paint->image; + call->blendFunc = glnvg__blendCompositeOperation(compositeOperation); + + // Allocate vertices for all the paths. + call->triangleOffset = glnvg__allocVerts(gl, nverts); + if (call->triangleOffset == -1) goto error; + call->triangleCount = nverts; + + memcpy(&gl->verts[call->triangleOffset], verts, sizeof(NVGvertex) * nverts); + + // Fill shader + call->uniformOffset = glnvg__allocFragUniforms(gl, 1); + if (call->uniformOffset == -1) goto error; + frag = nvg__fragUniformPtr(gl, call->uniformOffset); + glnvg__convertPaint(gl, frag, paint, scissor, 1.0f, fringe, -1.0f); + frag->type = NSVG_SHADER_IMG; + + return; + +error: + // We get here if call alloc was ok, but something else is not. + // Roll back the last call to prevent drawing it. + if (gl->ncalls > 0) gl->ncalls--; +} + +static void glnvg__renderDelete(void* uptr) +{ + GLNVGcontext* gl = (GLNVGcontext*)uptr; + int i; + if (gl == NULL) return; + + glnvg__deleteShader(&gl->shader); + +#if NANOVG_GL3 +#if NANOVG_GL_USE_UNIFORMBUFFER + if (gl->fragBuf != 0) + glDeleteBuffers(1, &gl->fragBuf); +#endif + if (gl->vertArr != 0) + glDeleteVertexArrays(1, &gl->vertArr); +#endif + if (gl->vertBuf != 0) + glDeleteBuffers(1, &gl->vertBuf); + + for (i = 0; i < gl->ntextures; i++) { + if (gl->textures[i].tex != 0 && (gl->textures[i].flags & NVG_IMAGE_NODELETE) == 0) + glDeleteTextures(1, &gl->textures[i].tex); + } + free(gl->textures); + + free(gl->paths); + free(gl->verts); + free(gl->uniforms); + free(gl->calls); + + free(gl); +} + + +#if defined NANOVG_GL2 +NVGcontext* nvgCreateGL2(int flags) +#elif defined NANOVG_GL3 +NVGcontext* nvgCreateGL3(int flags) +#elif defined NANOVG_GLES2 +NVGcontext* nvgCreateGLES2(int flags) +#elif defined NANOVG_GLES3 +NVGcontext* nvgCreateGLES3(int flags) +#endif +{ + #ifdef NANOVG_USE_GLEW + if (!glew_initialized) { + if (glewInit() == GLEW_OK) { + glew_initialized = 1; + } else { + printf("Failed to initialize GLEW"); + // GLEW generates GL error because it calls glGetString(GL_EXTENSIONS), we'll consume it here. + glGetError(); + } + } + #endif + + NVGparams params; + NVGcontext* ctx = NULL; + GLNVGcontext* gl = (GLNVGcontext*)malloc(sizeof(GLNVGcontext)); + if (gl == NULL) goto error; + memset(gl, 0, sizeof(GLNVGcontext)); + + memset(¶ms, 0, sizeof(params)); + params.renderCreate = glnvg__renderCreate; + params.renderCreateTexture = glnvg__renderCreateTexture; + params.renderDeleteTexture = glnvg__renderDeleteTexture; + params.renderUpdateTexture = glnvg__renderUpdateTexture; + params.renderGetTextureSize = glnvg__renderGetTextureSize; + params.renderViewport = glnvg__renderViewport; + params.renderCancel = glnvg__renderCancel; + params.renderFlush = glnvg__renderFlush; + params.renderFill = glnvg__renderFill; + params.renderStroke = glnvg__renderStroke; + params.renderTriangles = glnvg__renderTriangles; + params.renderDelete = glnvg__renderDelete; + params.userPtr = gl; + params.edgeAntiAlias = flags & NVG_ANTIALIAS ? 1 : 0; + + gl->flags = flags; + + ctx = nvgCreateInternal(¶ms); + if (ctx == NULL) goto error; + + return ctx; + +error: + // 'gl' is freed by nvgDeleteInternal. + if (ctx != NULL) nvgDeleteInternal(ctx); + return NULL; +} + +#if defined NANOVG_GL2 +void nvgDeleteGL2(NVGcontext* ctx) +#elif defined NANOVG_GL3 +void nvgDeleteGL3(NVGcontext* ctx) +#elif defined NANOVG_GLES2 +void nvgDeleteGLES2(NVGcontext* ctx) +#elif defined NANOVG_GLES3 +void nvgDeleteGLES3(NVGcontext* ctx) +#endif +{ + nvgDeleteInternal(ctx); +} + +#if defined NANOVG_GL2 +int nvglCreateImageFromHandleGL2(NVGcontext* ctx, unsigned int textureId, int w, int h, int imageFlags) +#elif defined NANOVG_GL3 +int nvglCreateImageFromHandleGL3(NVGcontext* ctx, unsigned int textureId, int w, int h, int imageFlags) +#elif defined NANOVG_GLES2 +int nvglCreateImageFromHandleGLES2(NVGcontext* ctx, unsigned int textureId, int w, int h, int imageFlags) +#elif defined NANOVG_GLES3 +int nvglCreateImageFromHandleGLES3(NVGcontext* ctx, unsigned int textureId, int w, int h, int imageFlags) +#endif +{ + GLNVGcontext* gl = (GLNVGcontext*)nvgInternalParams(ctx)->userPtr; + GLNVGtexture* tex = glnvg__allocTexture(gl); + + if (tex == NULL) return 0; + + tex->type = NVG_TEXTURE_RGBA; + tex->tex = textureId; + tex->flags = imageFlags; + tex->width = w; + tex->height = h; + + return tex->id; +} + +#if defined NANOVG_GL2 +unsigned int nvglImageHandleGL2(NVGcontext* ctx, int image) +#elif defined NANOVG_GL3 +unsigned int nvglImageHandleGL3(NVGcontext* ctx, int image) +#elif defined NANOVG_GLES2 +unsigned int nvglImageHandleGLES2(NVGcontext* ctx, int image) +#elif defined NANOVG_GLES3 +unsigned int nvglImageHandleGLES3(NVGcontext* ctx, int image) +#endif +{ + GLNVGcontext* gl = (GLNVGcontext*)nvgInternalParams(ctx)->userPtr; + GLNVGtexture* tex = glnvg__findTexture(gl, image); + return tex->tex; +} + +#if defined NANOVG_GL2 +const NanoVG_GL_Functions_VTable NanoVG_GL2_Functions_VTable = { + .name = "GL2", + .createContext = &nvgCreateGL2, + .deleteContext = &nvgDeleteGL2, + .createImageFromHandle = &nvglCreateImageFromHandleGL2, + .getImageHandle = &nvglImageHandleGL2, +}; +#elif defined NANOVG_GL3 +const NanoVG_GL_Functions_VTable NanoVG_GL3_Functions_VTable = { + .name = "GL3", + .createContext = &nvgCreateGL3, + .deleteContext = &nvgDeleteGL3, + .createImageFromHandle = &nvglCreateImageFromHandleGL3, + .getImageHandle = &nvglImageHandleGL3, +}; +#elif defined NANOVG_GLES2 +const NanoVG_GL_Functions_VTable NanoVG_GLES2_Functions_VTable = { + .name = "GLES2", + .createContext = &nvgCreateGLES2, + .deleteContext = &nvgDeleteGLES2, + .createImageFromHandle = &nvglCreateImageFromHandleGLES2, + .getImageHandle = &nvglImageHandleGLES2, +}; +#elif defined NANOVG_GLES3 +const NanoVG_GL_Functions_VTable NanoVG_GLES3_Functions_VTable = { + .name = "GLES2", + .createContext = &nvgCreateGLES3, + .deleteContext = &nvgDeleteGLES3, + .createImageFromHandle = &nvglCreateImageFromHandleGLES3, + .getImageHandle = &nvglImageHandleGLES3, +}; +#endif |