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nanovg/obsolete/nanovg_gl3.h

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//
// 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.
//
#ifndef NANOVG_GL3_H
#define NANOVG_GL3_H
#ifdef __cplusplus
extern "C" {
#endif
#define NVG_ANTIALIAS 1
#ifdef NANOVG_GLES3_IMPLEMENTATION
# ifndef NANOVG_GLES3
# define NANOVG_GLES3
# endif
# ifndef NANOVG_GL3_IMPLEMENTATION
# define NANOVG_GL3_IMPLEMENTATION
# endif
#endif
#ifdef NANOVG_GLES3
struct NVGcontext* nvgCreateGLES3(int atlasw, int atlash, int edgeaa);
void nvgDeleteGLES3(struct NVGcontext* ctx);
#else
struct NVGcontext* nvgCreateGL3(int atlasw, int atlash, int edgeaa);
void nvgDeleteGL3(struct NVGcontext* ctx);
#endif
#ifdef __cplusplus
}
#endif
#endif
#ifdef NANOVG_GL3_IMPLEMENTATION
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "nanovg.h"
enum GLNVGuniformLoc {
GLNVG_LOC_VIEWSIZE,
GLNVG_LOC_SCISSORMAT,
GLNVG_LOC_SCISSOREXT,
GLNVG_LOC_SCISSORSCALE,
GLNVG_LOC_PAINTMAT,
GLNVG_LOC_EXTENT,
GLNVG_LOC_RADIUS,
GLNVG_LOC_FEATHER,
GLNVG_LOC_INNERCOL,
GLNVG_LOC_OUTERCOL,
GLNVG_LOC_STROKEMULT,
GLNVG_LOC_TEX,
GLNVG_LOC_TEXTYPE,
GLNVG_LOC_TYPE,
GLNVG_MAX_LOCS
};
enum GLNVGshaderType {
NSVG_SHADER_FILLGRAD,
NSVG_SHADER_FILLIMG,
NSVG_SHADER_SIMPLE,
NSVG_SHADER_IMG
};
struct GLNVGshader {
GLuint prog;
GLuint frag;
GLuint vert;
GLint loc[GLNVG_MAX_LOCS];
};
struct GLNVGtexture {
int id;
GLuint tex;
int width, height;
int type;
};
struct GLNVGcontext {
struct GLNVGshader shader;
struct GLNVGtexture* textures;
float viewWidth, viewHeight;
int ntextures;
int ctextures;
int textureId;
GLuint vertArr;
GLuint vertBuf;
int edgeAntiAlias;
};
static struct GLNVGtexture* glnvg__allocTexture(struct GLNVGcontext* gl)
{
struct 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) {
gl->ctextures = (gl->ctextures == 0) ? 2 : gl->ctextures*2;
gl->textures = (struct GLNVGtexture*)realloc(gl->textures, sizeof(struct GLNVGtexture)*gl->ctextures);
if (gl->textures == NULL) return NULL;
}
tex = &gl->textures[gl->ntextures++];
}
memset(tex, 0, sizeof(*tex));
tex->id = ++gl->textureId;
return tex;
}
static struct GLNVGtexture* glnvg__findTexture(struct 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(struct 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)
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)
{
char str[512+1];
int 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)
{
char str[512+1];
int 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 int glnvg__checkError(const char* str)
{
GLenum err = glGetError();
if (err != GL_NO_ERROR) {
printf("Error %08x after %s\n", err, str);
return 1;
}
return 0;
}
static int glnvg__createShader(struct GLNVGshader* shader, const char* name, const char* vshader, const char* fshader)
{
GLint status;
GLuint prog, vert, frag;
memset(shader, 0, sizeof(*shader));
prog = glCreateProgram();
vert = glCreateShader(GL_VERTEX_SHADER);
frag = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vert, 1, &vshader, 0);
glShaderSource(frag, 1, &fshader, 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");
glBindAttribLocation(prog, 2, "color");
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(struct 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(struct GLNVGshader* shader)
{
shader->loc[GLNVG_LOC_VIEWSIZE] = glGetUniformLocation(shader->prog, "viewSize");
shader->loc[GLNVG_LOC_SCISSORMAT] = glGetUniformLocation(shader->prog, "scissorMat");
shader->loc[GLNVG_LOC_SCISSOREXT] = glGetUniformLocation(shader->prog, "scissorExt");
shader->loc[GLNVG_LOC_SCISSORSCALE] = glGetUniformLocation(shader->prog, "scissorScale");
shader->loc[GLNVG_LOC_PAINTMAT] = glGetUniformLocation(shader->prog, "paintMat");
shader->loc[GLNVG_LOC_EXTENT] = glGetUniformLocation(shader->prog, "extent");
shader->loc[GLNVG_LOC_RADIUS] = glGetUniformLocation(shader->prog, "radius");
shader->loc[GLNVG_LOC_FEATHER] = glGetUniformLocation(shader->prog, "feather");
shader->loc[GLNVG_LOC_INNERCOL] = glGetUniformLocation(shader->prog, "innerCol");
shader->loc[GLNVG_LOC_OUTERCOL] = glGetUniformLocation(shader->prog, "outerCol");
shader->loc[GLNVG_LOC_STROKEMULT] = glGetUniformLocation(shader->prog, "strokeMult");
shader->loc[GLNVG_LOC_TEX] = glGetUniformLocation(shader->prog, "tex");
shader->loc[GLNVG_LOC_TEXTYPE] = glGetUniformLocation(shader->prog, "texType");
shader->loc[GLNVG_LOC_TYPE] = glGetUniformLocation(shader->prog, "type");
}
static int glnvg__renderCreate(void* uptr)
{
struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
static const char* fillVertShader =
#ifdef NANOVG_GLES3
"#version 300 es\n"
"precision mediump float;\n"
#else
"#version 150 core\n"
#endif
"uniform vec2 viewSize;\n"
"in vec2 vertex;\n"
"in vec2 tcoord;\n"
"in vec4 color;\n"
"out vec2 ftcoord;\n"
"out vec4 fcolor;\n"
"out vec2 fpos;\n"
"void main(void) {\n"
" ftcoord = tcoord;\n"
" fcolor = color;\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* fillFragShaderEdgeAA =
#ifdef NANOVG_GLES3
"#version 300 es\n"
"precision mediump float;\n"
#else
"#version 150 core\n"
#endif
"uniform mat3 scissorMat;\n"
"uniform vec2 scissorExt;\n"
"uniform vec2 scissorScale;\n"
"uniform mat3 paintMat;\n"
"uniform vec2 extent;\n"
"uniform float radius;\n"
"uniform float feather;\n"
"uniform vec4 innerCol;\n"
"uniform vec4 outerCol;\n"
"uniform float strokeMult;\n"
"uniform sampler2D tex;\n"
"uniform int texType;\n"
"uniform int type;\n"
"in vec2 ftcoord;\n"
"in vec4 fcolor;\n"
"in vec2 fpos;\n"
"out vec4 outColor;\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"
"\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) * ftcoord.y;\n"
"}\n"
"\n"
"void main(void) {\n"
" if (type == 0) { // Gradient\n"
" float scissor = scissorMask(fpos);\n"
" float strokeAlpha = strokeMask();\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.w *= strokeAlpha * scissor;\n"
" outColor = color;\n"
" } else if (type == 1) { // Image\n"
" float scissor = scissorMask(fpos);\n"
" float strokeAlpha = strokeMask();\n"
" // Calculate color fron texture\n"
" vec2 pt = (paintMat * vec3(fpos,1.0)).xy / extent;\n"
" vec4 color = texture(tex, pt);\n"
" color = texType == 0 ? color : vec4(1,1,1,color.x);\n"
" // Combine alpha\n"
" color.w *= strokeAlpha * scissor;\n"
" outColor = color;\n"
" } else if (type == 2) { // Stencil fill\n"
" outColor = vec4(1,1,1,1);\n"
" } else if (type == 3) { // Textured tris\n"
" vec4 color = texture(tex, ftcoord);\n"
" color = texType == 0 ? color : vec4(1,1,1,color.x);\n"
" outColor = color * fcolor;\n"
" }\n"
"}\n";
static const char* fillFragShader =
#ifdef NANOVG_GLES3
"#version 300 es\n"
"precision mediump float;\n"
#else
"#version 150 core\n"
#endif
"uniform mat3 scissorMat;\n"
"uniform vec2 scissorExt;\n"
"uniform vec2 scissorScale;\n"
"uniform mat3 paintMat;\n"
"uniform vec2 extent;\n"
"uniform float radius;\n"
"uniform float feather;\n"
"uniform vec4 innerCol;\n"
"uniform vec4 outerCol;\n"
"uniform float strokeMult;\n"
"uniform sampler2D tex;\n"
"uniform int texType;\n"
"uniform int type;\n"
"in vec2 ftcoord;\n"
"in vec4 fcolor;\n"
"in vec2 fpos;\n"
"out vec4 outColor;\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"
"\n"
"void main(void) {\n"
" if (type == 0) { // Gradient\n"
" float scissor = scissorMask(fpos);\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.w *= scissor;\n"
" outColor = color;\n"
" } else if (type == 1) { // Image\n"
" float scissor = scissorMask(fpos);\n"
" // Calculate color fron texture\n"
" vec2 pt = (paintMat * vec3(fpos,1.0)).xy / extent;\n"
" vec4 color = texture(tex, pt);\n"
" color = texType == 0 ? color : vec4(1,1,1,color.x);\n"
" // Combine alpha\n"
" color.w *= scissor;\n"
" outColor = color;\n"
" } else if (type == 2) { // Stencil fill\n"
" outColor = vec4(1,1,1,1);\n"
" } else if (type == 3) { // Textured tris\n"
" vec4 color = texture(tex, ftcoord);\n"
" color = texType == 0 ? color : vec4(1,1,1,color.x);\n"
" outColor = color * fcolor;\n"
" }\n"
"}\n";
glnvg__checkError("init");
if (gl->edgeAntiAlias) {
if (glnvg__createShader(&gl->shader, "shader", fillVertShader, fillFragShaderEdgeAA) == 0)
return 0;
} else {
if (glnvg__createShader(&gl->shader, "shader", fillVertShader, fillFragShader) == 0)
return 0;
}
glnvg__checkError("uniform locations");
glnvg__getUniforms(&gl->shader);
// Create dynamic vertex array
glGenVertexArrays(1, &gl->vertArr);
glGenBuffers(1, &gl->vertBuf);
glnvg__checkError("done");
return 1;
}
static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, const unsigned char* data)
{
struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
struct GLNVGtexture* tex = glnvg__allocTexture(gl);
if (tex == NULL) return 0;
glGenTextures(1, &tex->tex);
tex->width = w;
tex->height = h;
tex->type = type;
glBindTexture(GL_TEXTURE_2D, tex->tex);
glPixelStorei(GL_UNPACK_ALIGNMENT,1);
glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width);
glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
if (type == NVG_TEXTURE_RGBA)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
else
#ifdef 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
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
if (glnvg__checkError("create tex"))
return 0;
return tex->id;
}
static int glnvg__renderDeleteTexture(void* uptr, int image)
{
struct GLNVGcontext* gl = (struct 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)
{
struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
struct GLNVGtexture* tex = glnvg__findTexture(gl, image);
if (tex == NULL) return 0;
glBindTexture(GL_TEXTURE_2D, tex->tex);
glPixelStorei(GL_UNPACK_ALIGNMENT,1);
glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width);
glPixelStorei(GL_UNPACK_SKIP_PIXELS, x);
glPixelStorei(GL_UNPACK_SKIP_ROWS, y);
if (tex->type == NVG_TEXTURE_RGBA)
glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RGBA, GL_UNSIGNED_BYTE, data);
else
glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RED, GL_UNSIGNED_BYTE, data);
return 1;
}
static int glnvg__renderGetTextureSize(void* uptr, int image, int* w, int* h)
{
struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
struct GLNVGtexture* tex = glnvg__findTexture(gl, image);
if (tex == NULL) return 0;
*w = tex->width;
*h = tex->height;
return 1;
}
static void glnvg__xformIdentity(float* t)
{
t[0] = 1.0f; t[1] = 0.0f;
t[2] = 0.0f; t[3] = 1.0f;
t[4] = 0.0f; t[5] = 0.0f;
}
static void glnvg__xformInverse(float* inv, float* t)
{
double invdet, det = (double)t[0] * t[3] - (double)t[2] * t[1];
if (det > -1e-6 && det < 1e-6) {
glnvg__xformIdentity(t);
return;
}
invdet = 1.0 / det;
inv[0] = (float)(t[3] * invdet);
inv[2] = (float)(-t[2] * invdet);
inv[4] = (float)(((double)t[2] * t[5] - (double)t[3] * t[4]) * invdet);
inv[1] = (float)(-t[1] * invdet);
inv[3] = (float)(t[0] * invdet);
inv[5] = (float)(((double)t[1] * t[4] - (double)t[0] * t[5]) * invdet);
}
static void glnvg__xformToMat3x3(float* m3, float* t)
{
m3[0] = t[0];
m3[1] = t[1];
m3[2] = 0.0f;
m3[3] = t[2];
m3[4] = t[3];
m3[5] = 0.0f;
m3[6] = t[4];
m3[7] = t[5];
m3[8] = 1.0f;
}
static int glnvg__setupPaint(struct GLNVGcontext* gl, struct NVGpaint* paint, struct NVGscissor* scissor, float width, float fringe)
{
struct NVGcolor innerCol;
struct NVGcolor outerCol;
struct GLNVGtexture* tex = NULL;
float invxform[6], paintMat[9], scissorMat[9];
float scissorx = 0, scissory = 0;
float scissorsx = 0, scissorsy = 0;
innerCol = paint->innerColor;
outerCol = paint->outerColor;
glnvg__xformInverse(invxform, paint->xform);
glnvg__xformToMat3x3(paintMat, invxform);
if (scissor->extent[0] < 0.5f || scissor->extent[1] < 0.5f) {
memset(scissorMat, 0, sizeof(scissorMat));
scissorx = 1.0f;
scissory = 1.0f;
scissorsx = 1.0f;
scissorsy = 1.0f;
} else {
glnvg__xformInverse(invxform, scissor->xform);
glnvg__xformToMat3x3(scissorMat, invxform);
scissorx = scissor->extent[0];
scissory = scissor->extent[1];
scissorsx = sqrtf(scissor->xform[0]*scissor->xform[0] + scissor->xform[2]*scissor->xform[2]) / fringe;
scissorsy = sqrtf(scissor->xform[1]*scissor->xform[1] + scissor->xform[3]*scissor->xform[3]) / fringe;
}
if (paint->image != 0) {
tex = glnvg__findTexture(gl, paint->image);
if (tex == NULL) return 0;
glUseProgram(gl->shader.prog);
glUniform1i(gl->shader.loc[GLNVG_LOC_TYPE], NSVG_SHADER_FILLIMG);
glUniform2f(gl->shader.loc[GLNVG_LOC_VIEWSIZE], gl->viewWidth, gl->viewHeight);
glUniformMatrix3fv(gl->shader.loc[GLNVG_LOC_SCISSORMAT], 1, GL_FALSE, scissorMat);
glUniform2f(gl->shader.loc[GLNVG_LOC_SCISSOREXT], scissorx, scissory);
glUniform2f(gl->shader.loc[GLNVG_LOC_SCISSORSCALE], scissorsx, scissorsy);
glUniformMatrix3fv(gl->shader.loc[GLNVG_LOC_PAINTMAT], 1, GL_FALSE, paintMat);
glUniform2f(gl->shader.loc[GLNVG_LOC_EXTENT], paint->extent[0], paint->extent[1]);
glUniform1f(gl->shader.loc[GLNVG_LOC_STROKEMULT], (width*0.5f + fringe*0.5f)/fringe);
glUniform1i(gl->shader.loc[GLNVG_LOC_TEX], 0);
glUniform1i(gl->shader.loc[GLNVG_LOC_TEXTYPE], tex->type == NVG_TEXTURE_RGBA ? 0 : 1);
glnvg__checkError("tex paint loc");
glBindTexture(GL_TEXTURE_2D, tex->tex);
glnvg__checkError("tex paint tex");
} else {
glUseProgram(gl->shader.prog);
glUniform1i(gl->shader.loc[GLNVG_LOC_TYPE], NSVG_SHADER_FILLGRAD);
glUniform2f(gl->shader.loc[GLNVG_LOC_VIEWSIZE], gl->viewWidth, gl->viewHeight);
glUniformMatrix3fv(gl->shader.loc[GLNVG_LOC_SCISSORMAT], 1, GL_FALSE, scissorMat);
glUniform2f(gl->shader.loc[GLNVG_LOC_SCISSOREXT], scissorx, scissory);
glUniform2f(gl->shader.loc[GLNVG_LOC_SCISSORSCALE], scissorsx, scissorsy);
glUniformMatrix3fv(gl->shader.loc[GLNVG_LOC_PAINTMAT], 1, GL_FALSE, paintMat);
glUniform2f(gl->shader.loc[GLNVG_LOC_EXTENT], paint->extent[0], paint->extent[1]);
glUniform1f(gl->shader.loc[GLNVG_LOC_RADIUS], paint->radius);
glUniform1f(gl->shader.loc[GLNVG_LOC_FEATHER], paint->feather);
glUniform4fv(gl->shader.loc[GLNVG_LOC_INNERCOL], 1, innerCol.rgba);
glUniform4fv(gl->shader.loc[GLNVG_LOC_OUTERCOL], 1, outerCol.rgba);
glUniform1f(gl->shader.loc[GLNVG_LOC_STROKEMULT], (width*0.5f + fringe*0.5f)/fringe);
glnvg__checkError("grad paint loc");
}
return 1;
}
static void glnvg__renderViewport(void* uptr, int width, int height, int alphaBlend)
{
struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
gl->viewWidth = (float)width;
gl->viewHeight = (float)height;
if (alphaBlend == NVG_PREMULTIPLIED_ALPHA)
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
else
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
static void glnvg__renderFlush(void* uptr, int alphaBlend)
{
// struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
NVG_NOTUSED(uptr);
NVG_NOTUSED(alphaBlend);
}
static int glnvg__maxVertCount(const struct 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 void glnvg__uploadPaths(const struct NVGpath* paths, int npaths)
{
const struct NVGpath* path;
int i, n = 0;
for (i = 0; i < npaths; i++) {
path = &paths[i];
if (path->nfill > 0) {
glBufferSubData(GL_ARRAY_BUFFER, n*sizeof(struct NVGvertex), path->nfill * sizeof(struct NVGvertex), &path->fill[0].x);
n += path->nfill;
}
if (path->nstroke > 0) {
glBufferSubData(GL_ARRAY_BUFFER, n*sizeof(struct NVGvertex), path->nstroke * sizeof(struct NVGvertex), &path->stroke[0].x);
n += path->nstroke;
}
}
}
static void glnvg__renderFill(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float fringe,
const float* bounds, const struct NVGpath* paths, int npaths)
{
struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
const struct NVGpath* path;
int i, n, offset, maxCount;
if (gl->shader.prog == 0)
return;
maxCount = glnvg__maxVertCount(paths, npaths);
glBindVertexArray(gl->vertArr);
glBindBuffer(GL_ARRAY_BUFFER, gl->vertBuf);
glBufferData(GL_ARRAY_BUFFER, maxCount * sizeof(struct NVGvertex), NULL, GL_STREAM_DRAW);
glnvg__uploadPaths(paths, npaths);
if (npaths == 1 && paths[0].convex) {
glEnable(GL_CULL_FACE);
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glnvg__setupPaint(gl, paint, scissor, fringe, fringe);
glDisable(GL_CULL_FACE);
n = 0;
for (i = 0; i < npaths; i++) {
path = &paths[i];
offset = n * sizeof(struct NVGvertex);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(size_t)offset);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(offset + 2*sizeof(float)));
glDrawArrays(GL_TRIANGLE_FAN, 0, path->nfill);
n += path->nfill + path->nstroke;
}
glEnable(GL_CULL_FACE);
if (gl->edgeAntiAlias) {
// Draw fringes
n = 0;
for (i = 0; i < npaths; i++) {
path = &paths[i];
offset = (n + path->nfill) * sizeof(struct NVGvertex);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(size_t)offset);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(offset + 2*sizeof(float)));
glDrawArrays(GL_TRIANGLE_STRIP, 0, path->nstroke);
n += path->nfill + path->nstroke;
}
}
glUseProgram(0);
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
} else {
glEnable(GL_CULL_FACE);
glBindVertexArray(gl->vertArr);
glBindBuffer(GL_ARRAY_BUFFER, gl->vertBuf);
// Draw shapes
glDisable(GL_BLEND);
glEnable(GL_STENCIL_TEST);
glStencilMask(0xff);
glStencilFunc(GL_ALWAYS, 0, ~0);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glUseProgram(gl->shader.prog);
glUniform1i(gl->shader.loc[GLNVG_LOC_TYPE], NSVG_SHADER_SIMPLE);
glUniform2f(gl->shader.loc[GLNVG_LOC_VIEWSIZE], gl->viewWidth, gl->viewHeight);
glnvg__checkError("fill solid loc");
glEnableVertexAttribArray(0);
glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR_WRAP);
glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR_WRAP);
glDisable(GL_CULL_FACE);
n = 0;
for (i = 0; i < npaths; i++) {
path = &paths[i];
offset = n * sizeof(struct NVGvertex);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(size_t)offset);
glDrawArrays(GL_TRIANGLE_FAN, 0, path->nfill);
n += path->nfill + path->nstroke;
}
glEnable(GL_CULL_FACE);
// Draw aliased off-pixels
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glEnable(GL_BLEND);
glEnableVertexAttribArray(1);
glnvg__setupPaint(gl, paint, scissor, fringe, fringe);
if (gl->edgeAntiAlias) {
glStencilFunc(GL_EQUAL, 0x00, 0xff);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
// Draw fringes
n = 0;
for (i = 0; i < npaths; i++) {
path = &paths[i];
offset = (n + path->nfill) * sizeof(struct NVGvertex);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(size_t)offset);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(offset + 2*sizeof(float)));
glDrawArrays(GL_TRIANGLE_STRIP, 0, path->nstroke);
n += path->nfill + path->nstroke;
}
}
// Draw fill
glStencilFunc(GL_NOTEQUAL, 0x0, 0xff);
glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO);
glDisableVertexAttribArray(1);
float quad[6*2] = {
bounds[0], bounds[3], bounds[2], bounds[3], bounds[2], bounds[1],
bounds[0], bounds[3], bounds[2], bounds[1], bounds[0], bounds[1],
};
glBufferSubData(GL_ARRAY_BUFFER, 0, 6 * 2*sizeof(float), quad);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2*sizeof(float), (const GLvoid*)0);
glVertexAttrib2f(1, 0.5f, 1.0f);
glDrawArrays(GL_TRIANGLES, 0, 6);
glUseProgram(0);
glDisableVertexAttribArray(0);
glDisable(GL_STENCIL_TEST);
}
}
static void glnvg__renderStroke(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float fringe,
float width, const struct NVGpath* paths, int npaths)
{
struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
const struct NVGpath* path;
int i, n, offset, maxCount;
if (gl->shader.prog == 0)
return;
glnvg__setupPaint(gl, paint, scissor, width, fringe);
glEnable(GL_CULL_FACE);
maxCount = glnvg__maxVertCount(paths, npaths);
glBindVertexArray(gl->vertArr);
glBindBuffer(GL_ARRAY_BUFFER, gl->vertBuf);
glBufferData(GL_ARRAY_BUFFER, maxCount * sizeof(struct NVGvertex), NULL, GL_STREAM_DRAW);
glnvg__uploadPaths(paths, npaths);
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
// Draw Strokes
n = 0;
for (i = 0; i < npaths; i++) {
path = &paths[i];
offset = (n + path->nfill) * sizeof(struct NVGvertex);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(size_t)offset);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(offset + 2*sizeof(float)));
glDrawArrays(GL_TRIANGLE_STRIP, 0, path->nstroke);
n += path->nfill + path->nstroke;
}
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
glUseProgram(0);
}
static void glnvg__renderTriangles(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor,
const struct NVGvertex* verts, int nverts)
{
struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
struct GLNVGtexture* tex = glnvg__findTexture(gl, paint->image);
struct NVGcolor color;
NVG_NOTUSED(scissor);
if (gl->shader.prog == 0)
return;
if (tex != NULL) {
glBindTexture(GL_TEXTURE_2D, tex->tex);
}
glUseProgram(gl->shader.prog);
glUniform1i(gl->shader.loc[GLNVG_LOC_TYPE], NSVG_SHADER_IMG);
glUniform2f(gl->shader.loc[GLNVG_LOC_VIEWSIZE], gl->viewWidth, gl->viewHeight);
glUniform1i(gl->shader.loc[GLNVG_LOC_TEX], 0);
glUniform1i(gl->shader.loc[GLNVG_LOC_TEXTYPE], tex->type == NVG_TEXTURE_RGBA ? 0 : 1);
glnvg__checkError("tris solid img loc");
glBindVertexArray(gl->vertArr);
glBindBuffer(GL_ARRAY_BUFFER, gl->vertBuf);
glBufferData(GL_ARRAY_BUFFER, nverts * sizeof(struct NVGvertex), verts, GL_STREAM_DRAW);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)0);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(2 * sizeof(float)));
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
color = paint->innerColor;
glVertexAttrib4fv(2, color.rgba);
glDrawArrays(GL_TRIANGLES, 0, nverts);
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
}
static void glnvg__renderDelete(void* uptr)
{
struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
int i;
if (gl == NULL) return;
glnvg__deleteShader(&gl->shader);
for (i = 0; i < gl->ntextures; i++) {
if (gl->textures[i].tex != 0)
glDeleteTextures(1, &gl->textures[i].tex);
}
free(gl->textures);
free(gl);
}
#ifdef NANOVG_GLES3
struct NVGcontext* nvgCreateGLES3(int atlasw, int atlash, int edgeaa)
#else
struct NVGcontext* nvgCreateGL3(int atlasw, int atlash, int edgeaa)
#endif
{
struct NVGparams params;
struct NVGcontext* ctx = NULL;
struct GLNVGcontext* gl = (struct GLNVGcontext*)malloc(sizeof(struct GLNVGcontext));
if (gl == NULL) goto error;
memset(gl, 0, sizeof(struct GLNVGcontext));
memset(&params, 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.renderFlush = glnvg__renderFlush;
params.renderFill = glnvg__renderFill;
params.renderStroke = glnvg__renderStroke;
params.renderTriangles = glnvg__renderTriangles;
params.renderDelete = glnvg__renderDelete;
params.userPtr = gl;
params.atlasWidth = atlasw;
params.atlasHeight = atlash;
params.edgeAntiAlias = edgeaa;
gl->edgeAntiAlias = edgeaa;
ctx = nvgCreateInternal(&params);
if (ctx == NULL) goto error;
return ctx;
error:
// 'gl' is freed by nvgDeleteInternal.
if (ctx != NULL) nvgDeleteInternal(ctx);
return NULL;
}
#ifdef NANOVG_GLES3
void nvgDeleteGLES3(struct NVGcontext* ctx)
#else
void nvgDeleteGL3(struct NVGcontext* ctx)
#endif
{
nvgDeleteInternal(ctx);
}
#endif
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