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nanovg_gl.h
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nanovg_gl.h
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//
// Copyright (c) 2009-2013 Mikko Mononen [email protected]
//
// 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_GL_H
#define NANOVG_GL_H
#ifdef __cplusplus
extern "C" {
#endif
// Create flags
enum NVGcreateFlags {
// Flag indicating if geometry based anti-aliasing is used (may not be needed when using MSAA).
NVG_ANTIALIAS = 1<<0,
// Flag indicating if strokes should be drawn using stencil buffer. The rendering will be a little
// slower, but path overlaps (i.e. self-intersecting or sharp turns) will be drawn just once.
NVG_STENCIL_STROKES = 1<<1,
// Flag indicating that additional debug checks are done.
NVG_DEBUG = 1<<2,
};
#if defined NANOVG_GL2_IMPLEMENTATION
# define NANOVG_GL2 1
# define NANOVG_GL_IMPLEMENTATION 1
#elif defined NANOVG_GL3_IMPLEMENTATION
# define NANOVG_GL3 1
# define NANOVG_GL_IMPLEMENTATION 1
# define NANOVG_GL_USE_UNIFORMBUFFER 1
#elif defined NANOVG_GLES2_IMPLEMENTATION
# define NANOVG_GLES2 1
# define NANOVG_GL_IMPLEMENTATION 1
#elif defined NANOVG_GLES3_IMPLEMENTATION
# define NANOVG_GLES3 1
# define NANOVG_GL_IMPLEMENTATION 1
#endif
#define NANOVG_GL_USE_STATE_FILTER (1)
// Creates NanoVG contexts for different OpenGL (ES) versions.
// Flags should be combination of the create flags above.
#if defined NANOVG_GL2
NVGcontext* nvgCreateGL2(int flags);
void nvgDeleteGL2(NVGcontext* ctx);
#endif
#if defined NANOVG_GL3
NVGcontext* nvgCreateGL3(int flags);
void nvgDeleteGL3(NVGcontext* ctx);
#endif
#if defined NANOVG_GLES2
NVGcontext* nvgCreateGLES2(int flags);
void nvgDeleteGLES2(NVGcontext* ctx);
#endif
#if defined NANOVG_GLES3
NVGcontext* nvgCreateGLES3(int flags);
void nvgDeleteGLES3(NVGcontext* ctx);
#endif
// These are additional flags on top of NVGimageFlags.
enum NVGimageFlagsGL {
NVG_IMAGE_NODELETE = 1<<16, // Do not delete GL texture handle.
};
int nvglCreateImageFromHandle(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
GLuint nvglImageHandle(NVGcontext* ctx, int image);
#ifdef __cplusplus
}
#endif
#endif /* NANOVG_GL_H */
#ifdef NANOVG_GL_IMPLEMENTATION
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "nanovg.h"
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;
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;
};
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;
#endif
};
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 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__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"
"#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 EDGE_AA\n"
" if (strokeAlpha < strokeThr) discard;\n"
"#endif\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;
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)
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) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
} else {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
}
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
#ifdef NANOVG_GLES2
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 flipped[6];
nvgTransformScale(flipped, 1.0f, -1.0f);
nvgTransformMultiply(flipped, paint->xform);
nvgTransformInverse(invxform, flipped);
} else {
nvgTransformInverse(invxform, paint->xform);
}
frag->type = NSVG_SHADER_FILLIMG;
if (tex->type == NVG_TEXTURE_RGBA)
frag->texType = (tex->flags & NVG_IMAGE_PREMULTIPLIED) ? 0 : 1;
else
frag->texType = 2;
// 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)
{
#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) {
GLNVGtexture* tex = glnvg__findTexture(gl, image);
glnvg__bindTexture(gl, tex != NULL ? tex->tex : 0);
glnvg__checkError(gl, "tex paint tex");
} else {
glnvg__bindTexture(gl, 0);
}
}
static void glnvg__renderViewport(void* uptr, int width, int height)
{
GLNVGcontext* gl = (GLNVGcontext*)uptr;
gl->view[0] = (float)width;
gl->view[1] = (float)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_TRIANGLES, 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);
if (gl->flags & NVG_ANTIALIAS) {
// Draw fringes
for (i = 0; i < npaths; i++)
glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);