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glstate.cpp
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glstate.cpp
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/**************************************************************************
*
* Copyright 2011 Jose Fonseca
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#include <string.h>
#include <algorithm>
#include <iostream>
#include <map>
#include <sstream>
#include "image.hpp"
#include "json.hpp"
#include "glproc.hpp"
#include "glsize.hpp"
#include "glstate.hpp"
#ifdef __APPLE__
#include <Carbon/Carbon.h>
#ifdef __cplusplus
extern "C" {
#endif
OSStatus CGSGetSurfaceBounds(CGSConnectionID, CGWindowID, CGSSurfaceID, CGRect *);
#ifdef __cplusplus
}
#endif
#endif /* __APPLE__ */
namespace glstate {
static inline void
resetPixelPackState(void) {
glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
glPixelStorei(GL_PACK_ROW_LENGTH, 0);
glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
glPixelStorei(GL_PACK_SKIP_ROWS, 0);
glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
}
static inline void
restorePixelPackState(void) {
glPopClientAttrib();
}
// Mapping from shader type to shader source, used to accumulated the sources
// of different shaders with same type.
typedef std::map<std::string, std::string> ShaderMap;
static void
getShaderSource(ShaderMap &shaderMap, GLuint shader)
{
if (!shader) {
return;
}
GLint shader_type = 0;
glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type);
if (!shader_type) {
return;
}
GLint source_length = 0;
glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &source_length);
if (!source_length) {
return;
}
GLchar *source = new GLchar[source_length];
GLsizei length = 0;
source[0] = 0;
glGetShaderSource(shader, source_length, &length, source);
shaderMap[enumToString(shader_type)] += source;
delete [] source;
}
static void
getShaderObjSource(ShaderMap &shaderMap, GLhandleARB shaderObj)
{
if (!shaderObj) {
return;
}
GLint object_type = 0;
glGetObjectParameterivARB(shaderObj, GL_OBJECT_TYPE_ARB, &object_type);
if (object_type != GL_SHADER_OBJECT_ARB) {
return;
}
GLint shader_type = 0;
glGetObjectParameterivARB(shaderObj, GL_OBJECT_SUBTYPE_ARB, &shader_type);
if (!shader_type) {
return;
}
GLint source_length = 0;
glGetObjectParameterivARB(shaderObj, GL_OBJECT_SHADER_SOURCE_LENGTH_ARB, &source_length);
if (!source_length) {
return;
}
GLcharARB *source = new GLcharARB[source_length];
GLsizei length = 0;
source[0] = 0;
glGetShaderSource(shaderObj, source_length, &length, source);
shaderMap[enumToString(shader_type)] += source;
delete [] source;
}
static inline void
dumpProgram(JSONWriter &json, GLint program)
{
GLint attached_shaders = 0;
glGetProgramiv(program, GL_ATTACHED_SHADERS, &attached_shaders);
if (!attached_shaders) {
return;
}
ShaderMap shaderMap;
GLuint *shaders = new GLuint[attached_shaders];
GLsizei count = 0;
glGetAttachedShaders(program, attached_shaders, &count, shaders);
std::sort(shaders, shaders + count);
for (GLsizei i = 0; i < count; ++ i) {
getShaderSource(shaderMap, shaders[i]);
}
delete [] shaders;
for (ShaderMap::const_iterator it = shaderMap.begin(); it != shaderMap.end(); ++it) {
json.beginMember(it->first);
json.writeString(it->second);
json.endMember();
}
}
static inline void
dumpProgramObj(JSONWriter &json, GLhandleARB programObj)
{
GLint attached_shaders = 0;
glGetObjectParameterivARB(programObj, GL_OBJECT_ATTACHED_OBJECTS_ARB, &attached_shaders);
if (!attached_shaders) {
return;
}
ShaderMap shaderMap;
GLhandleARB *shaderObjs = new GLhandleARB[attached_shaders];
GLsizei count = 0;
glGetAttachedObjectsARB(programObj, attached_shaders, &count, shaderObjs);
std::sort(shaderObjs, shaderObjs + count);
for (GLsizei i = 0; i < count; ++ i) {
getShaderObjSource(shaderMap, shaderObjs[i]);
}
delete [] shaderObjs;
for (ShaderMap::const_iterator it = shaderMap.begin(); it != shaderMap.end(); ++it) {
json.beginMember(it->first);
json.writeString(it->second);
json.endMember();
}
}
/*
* When fetching the uniform name of an array we usually get name[0]
* so we need to cut the trailing "[0]" in order to properly construct
* array names later. Otherwise we endup with stuff like
* uniformArray[0][0],
* uniformArray[0][1],
* instead of
* uniformArray[0],
* uniformArray[1].
*/
static std::string
resolveUniformName(const GLchar *name, GLint size)
{
std::string qualifiedName(name);
if (size > 1) {
std::string::size_type nameLength = qualifiedName.length();
static const char * const arrayStart = "[0]";
static const int arrayStartLen = 3;
if (qualifiedName.rfind(arrayStart) == (nameLength - arrayStartLen)) {
qualifiedName = qualifiedName.substr(0, nameLength - 3);
}
}
return qualifiedName;
}
static void
dumpUniform(JSONWriter &json, GLint program, GLint size, GLenum type, const GLchar *name) {
GLenum elemType;
GLint numElems;
__gl_uniform_size(type, elemType, numElems);
if (elemType == GL_NONE) {
return;
}
GLfloat fvalues[4*4];
GLdouble dvalues[4*4];
GLint ivalues[4*4];
GLuint uivalues[4*4];
GLint i, j;
std::string qualifiedName = resolveUniformName(name, size);
for (i = 0; i < size; ++i) {
std::stringstream ss;
ss << qualifiedName;
if (size > 1) {
ss << '[' << i << ']';
}
std::string elemName = ss.str();
json.beginMember(elemName);
GLint location = glGetUniformLocation(program, elemName.c_str());
if (numElems > 1) {
json.beginArray();
}
switch (elemType) {
case GL_FLOAT:
glGetUniformfv(program, location, fvalues);
for (j = 0; j < numElems; ++j) {
json.writeNumber(fvalues[j]);
}
break;
case GL_DOUBLE:
glGetUniformdv(program, location, dvalues);
for (j = 0; j < numElems; ++j) {
json.writeNumber(dvalues[j]);
}
break;
case GL_INT:
glGetUniformiv(program, location, ivalues);
for (j = 0; j < numElems; ++j) {
json.writeNumber(ivalues[j]);
}
break;
case GL_UNSIGNED_INT:
glGetUniformuiv(program, location, uivalues);
for (j = 0; j < numElems; ++j) {
json.writeNumber(uivalues[j]);
}
break;
case GL_BOOL:
glGetUniformiv(program, location, ivalues);
for (j = 0; j < numElems; ++j) {
json.writeBool(ivalues[j]);
}
break;
default:
assert(0);
break;
}
if (numElems > 1) {
json.endArray();
}
json.endMember();
}
}
static void
dumpUniformARB(JSONWriter &json, GLhandleARB programObj, GLint size, GLenum type, const GLchar *name) {
GLenum elemType;
GLint numElems;
__gl_uniform_size(type, elemType, numElems);
if (elemType == GL_NONE) {
return;
}
GLfloat fvalues[4*4];
GLint ivalues[4*4];
GLint i, j;
std::string qualifiedName = resolveUniformName(name, size);
for (i = 0; i < size; ++i) {
std::stringstream ss;
ss << qualifiedName;
if (size > 1) {
ss << '[' << i << ']';
}
std::string elemName = ss.str();
json.beginMember(elemName);
GLint location = glGetUniformLocationARB(programObj, elemName.c_str());
if (numElems > 1) {
json.beginArray();
}
switch (elemType) {
case GL_DOUBLE:
// glGetUniformdvARB does not exists
case GL_FLOAT:
glGetUniformfvARB(programObj, location, fvalues);
for (j = 0; j < numElems; ++j) {
json.writeNumber(fvalues[j]);
}
break;
case GL_UNSIGNED_INT:
// glGetUniformuivARB does not exists
case GL_INT:
glGetUniformivARB(programObj, location, ivalues);
for (j = 0; j < numElems; ++j) {
json.writeNumber(ivalues[j]);
}
break;
case GL_BOOL:
glGetUniformivARB(programObj, location, ivalues);
for (j = 0; j < numElems; ++j) {
json.writeBool(ivalues[j]);
}
break;
default:
assert(0);
break;
}
if (numElems > 1) {
json.endArray();
}
json.endMember();
}
}
static inline void
dumpProgramUniforms(JSONWriter &json, GLint program)
{
GLint active_uniforms = 0;
glGetProgramiv(program, GL_ACTIVE_UNIFORMS, &active_uniforms);
if (!active_uniforms) {
return;
}
GLint active_uniform_max_length = 0;
glGetProgramiv(program, GL_ACTIVE_UNIFORM_MAX_LENGTH, &active_uniform_max_length);
GLchar *name = new GLchar[active_uniform_max_length];
if (!name) {
return;
}
for (GLint index = 0; index < active_uniforms; ++index) {
GLsizei length = 0;
GLint size = 0;
GLenum type = GL_NONE;
glGetActiveUniform(program, index, active_uniform_max_length, &length, &size, &type, name);
dumpUniform(json, program, size, type, name);
}
delete [] name;
}
static inline void
dumpProgramObjUniforms(JSONWriter &json, GLhandleARB programObj)
{
GLint active_uniforms = 0;
glGetObjectParameterivARB(programObj, GL_OBJECT_ACTIVE_UNIFORMS_ARB, &active_uniforms);
if (!active_uniforms) {
return;
}
GLint active_uniform_max_length = 0;
glGetObjectParameterivARB(programObj, GL_OBJECT_ACTIVE_UNIFORM_MAX_LENGTH_ARB, &active_uniform_max_length);
GLchar *name = new GLchar[active_uniform_max_length];
if (!name) {
return;
}
for (GLint index = 0; index < active_uniforms; ++index) {
GLsizei length = 0;
GLint size = 0;
GLenum type = GL_NONE;
glGetActiveUniformARB(programObj, index, active_uniform_max_length, &length, &size, &type, name);
dumpUniformARB(json, programObj, size, type, name);
}
delete [] name;
}
static inline void
dumpArbProgram(JSONWriter &json, GLenum target)
{
if (!glIsEnabled(target)) {
return;
}
GLint program_length = 0;
glGetProgramivARB(target, GL_PROGRAM_LENGTH_ARB, &program_length);
if (!program_length) {
return;
}
GLchar *source = new GLchar[program_length + 1];
source[0] = 0;
glGetProgramStringARB(target, GL_PROGRAM_STRING_ARB, source);
source[program_length] = 0;
json.beginMember(enumToString(target));
json.writeString(source);
json.endMember();
delete [] source;
}
static inline void
dumpArbProgramUniforms(JSONWriter &json, GLenum target, const char *prefix)
{
if (!glIsEnabled(target)) {
return;
}
GLint program_parameters = 0;
glGetProgramivARB(target, GL_PROGRAM_PARAMETERS_ARB, &program_parameters);
if (!program_parameters) {
return;
}
GLint max_program_local_parameters = 0;
glGetProgramivARB(target, GL_MAX_PROGRAM_LOCAL_PARAMETERS_ARB, &max_program_local_parameters);
for (GLint index = 0; index < max_program_local_parameters; ++index) {
GLdouble params[4] = {0, 0, 0, 0};
glGetProgramLocalParameterdvARB(target, index, params);
if (!params[0] && !params[1] && !params[2] && !params[3]) {
continue;
}
char name[256];
snprintf(name, sizeof name, "%sprogram.local[%i]", prefix, index);
json.beginMember(name);
json.beginArray();
json.writeNumber(params[0]);
json.writeNumber(params[1]);
json.writeNumber(params[2]);
json.writeNumber(params[3]);
json.endArray();
json.endMember();
}
GLint max_program_env_parameters = 0;
glGetProgramivARB(target, GL_MAX_PROGRAM_ENV_PARAMETERS_ARB, &max_program_env_parameters);
for (GLint index = 0; index < max_program_env_parameters; ++index) {
GLdouble params[4] = {0, 0, 0, 0};
glGetProgramEnvParameterdvARB(target, index, params);
if (!params[0] && !params[1] && !params[2] && !params[3]) {
continue;
}
char name[256];
snprintf(name, sizeof name, "%sprogram.env[%i]", prefix, index);
json.beginMember(name);
json.beginArray();
json.writeNumber(params[0]);
json.writeNumber(params[1]);
json.writeNumber(params[2]);
json.writeNumber(params[3]);
json.endArray();
json.endMember();
}
}
static inline void
dumpShadersUniforms(JSONWriter &json)
{
GLint program = 0;
glGetIntegerv(GL_CURRENT_PROGRAM, &program);
GLhandleARB programObj = glGetHandleARB(GL_PROGRAM_OBJECT_ARB);
json.beginMember("shaders");
json.beginObject();
if (program) {
dumpProgram(json, program);
} else if (programObj) {
dumpProgramObj(json, programObj);
} else {
dumpArbProgram(json, GL_FRAGMENT_PROGRAM_ARB);
dumpArbProgram(json, GL_VERTEX_PROGRAM_ARB);
}
json.endObject();
json.endMember(); // shaders
json.beginMember("uniforms");
json.beginObject();
if (program) {
dumpProgramUniforms(json, program);
} else if (programObj) {
dumpProgramObjUniforms(json, programObj);
} else {
dumpArbProgramUniforms(json, GL_FRAGMENT_PROGRAM_ARB, "fp.");
dumpArbProgramUniforms(json, GL_VERTEX_PROGRAM_ARB, "vp.");
}
json.endObject();
json.endMember(); // uniforms
}
static inline void
dumpTextureImage(JSONWriter &json, GLenum target, GLint level)
{
GLint width, height = 1, depth = 1;
GLint format;
glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &format);
width = 0;
glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
if (target != GL_TEXTURE_1D) {
height = 0;
glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
if (target == GL_TEXTURE_3D) {
depth = 0;
glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &depth);
}
}
if (width <= 0 || height <= 0 || depth <= 0) {
return;
} else {
char label[512];
GLint active_texture = GL_TEXTURE0;
glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
snprintf(label, sizeof label, "%s, %s, level = %d",
enumToString(active_texture), enumToString(target), level);
json.beginMember(label);
json.beginObject();
// Tell the GUI this is no ordinary object, but an image
json.writeStringMember("__class__", "image");
json.writeNumberMember("__width__", width);
json.writeNumberMember("__height__", height);
json.writeNumberMember("__depth__", depth);
json.writeStringMember("__format__", enumToString(format));
// Hardcoded for now, but we could chose types more adequate to the
// texture internal format
json.writeStringMember("__type__", "uint8");
json.writeBoolMember("__normalized__", true);
json.writeNumberMember("__channels__", 4);
GLubyte *pixels = new GLubyte[depth*width*height*4];
resetPixelPackState();
glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
restorePixelPackState();
json.beginMember("__data__");
char *pngBuffer;
int pngBufferSize;
image::writePixelsToBuffer(pixels, width, height, 4, true, &pngBuffer, &pngBufferSize);
json.writeBase64(pngBuffer, pngBufferSize);
free(pngBuffer);
json.endMember(); // __data__
delete [] pixels;
json.endObject();
}
}
static inline void
dumpTexture(JSONWriter &json, GLenum target, GLenum binding)
{
GLint texture_binding = 0;
glGetIntegerv(binding, &texture_binding);
if (!glIsEnabled(target) && !texture_binding) {
return;
}
GLint level = 0;
do {
GLint width = 0, height = 0;
glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
if (!width || !height) {
break;
}
if (target == GL_TEXTURE_CUBE_MAP) {
for (int face = 0; face < 6; ++face) {
dumpTextureImage(json, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
}
} else {
dumpTextureImage(json, target, level);
}
++level;
} while(true);
}
static inline void
dumpTextures(JSONWriter &json)
{
json.beginMember("textures");
json.beginObject();
GLint active_texture = GL_TEXTURE0;
glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
GLint max_texture_coords = 0;
glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
GLint max_combined_texture_image_units = 0;
glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
for (GLint unit = 0; unit < max_units; ++unit) {
GLenum texture = GL_TEXTURE0 + unit;
glActiveTexture(texture);
dumpTexture(json, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
dumpTexture(json, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
dumpTexture(json, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
dumpTexture(json, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
dumpTexture(json, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
}
glActiveTexture(active_texture);
json.endObject();
json.endMember(); // textures
}
static bool
getDrawableBounds(GLint *width, GLint *height) {
#if defined(_WIN32)
HDC hDC = wglGetCurrentDC();
if (!hDC) {
return false;
}
HWND hWnd = WindowFromDC(hDC);
RECT rect;
if (!GetClientRect(hWnd, &rect)) {
return false;
}
*width = rect.right - rect.left;
*height = rect.bottom - rect.top;
#elif defined(__APPLE__)
CGLContextObj ctx = CGLGetCurrentContext();
if (ctx == NULL) {
return false;
}
CGSConnectionID cid;
CGSWindowID wid;
CGSSurfaceID sid;
if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
return false;
}
CGRect rect;
if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
return false;
}
*width = rect.size.width;
*height = rect.size.height;
#else
#if !TRACE_EGL
Display *display;
Drawable drawable;
Window root;
int x, y;
unsigned int w, h, bw, depth;
display = glXGetCurrentDisplay();
if (!display) {
return false;
}
drawable = glXGetCurrentDrawable();
if (drawable == None) {
return false;
}
if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
return false;
}
*width = w;
*height = h;
#else
return false;
#endif
#endif
return true;
}
static const GLenum texture_bindings[][2] = {
{GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D},
{GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D},
{GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D},
{GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE},
{GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP}
};
static bool
bindTexture(GLint texture, GLenum &target, GLint &bound_texture)
{
for (unsigned i = 0; i < sizeof(texture_bindings)/sizeof(texture_bindings[0]); ++i) {
target = texture_bindings[i][0];
GLenum binding = texture_bindings[i][1];
while (glGetError() != GL_NO_ERROR)
;
glGetIntegerv(binding, &bound_texture);
glBindTexture(target, texture);
if (glGetError() == GL_NO_ERROR) {
return true;
}
glBindTexture(target, bound_texture);
}
target = GL_NONE;
return false;
}
static bool
getTextureLevelSize(GLint texture, GLint level, GLint *width, GLint *height)
{
*width = 0;
*height = 0;
GLenum target;
GLint bound_texture = 0;
if (!bindTexture(texture, target, bound_texture)) {
return false;
}
glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, width);
glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, height);
glBindTexture(target, bound_texture);
return *width > 0 && *height > 0;
}
static GLenum
getTextureLevelFormat(GLint texture, GLint level)
{
GLenum target;
GLint bound_texture = 0;
if (!bindTexture(texture, target, bound_texture)) {
return GL_NONE;
}
GLint format = GL_NONE;
glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &format);
glBindTexture(target, bound_texture);
return format;
}
static bool
getRenderbufferSize(GLint renderbuffer, GLint *width, GLint *height)
{
GLint bound_renderbuffer = 0;
glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
*width = 0;
*height = 0;
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, width);
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, height);
glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
return *width > 0 && *height > 0;
}
static GLenum
getRenderbufferFormat(GLint renderbuffer)
{
GLint bound_renderbuffer = 0;
glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
GLint format = GL_NONE;
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
return format;
}
static bool
getFramebufferAttachmentSize(GLenum target, GLenum attachment, GLint *width, GLint *height)
{
GLint object_type = GL_NONE;
glGetFramebufferAttachmentParameteriv(target, attachment,
GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
&object_type);
if (object_type == GL_NONE) {
return false;
}
GLint object_name = 0;
glGetFramebufferAttachmentParameteriv(target, attachment,
GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
&object_name);
if (object_name == 0) {
return false;
}
if (object_type == GL_RENDERBUFFER) {
return getRenderbufferSize(object_name, width, height);
} else if (object_type == GL_TEXTURE) {
GLint texture_level = 0;
glGetFramebufferAttachmentParameteriv(target, attachment,
GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
&texture_level);
return getTextureLevelSize(object_name, texture_level, width, height);
} else {
std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
return false;
}
}
static GLint
getFramebufferAttachmentFormat(GLenum target, GLenum attachment)
{
GLint object_type = GL_NONE;
glGetFramebufferAttachmentParameteriv(target, attachment,
GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
&object_type);
if (object_type == GL_NONE) {
return GL_NONE;
}
GLint object_name = 0;
glGetFramebufferAttachmentParameteriv(target, attachment,
GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
&object_name);
if (object_name == 0) {
return GL_NONE;
}
if (object_type == GL_RENDERBUFFER) {
return getRenderbufferFormat(object_name);
} else if (object_type == GL_TEXTURE) {
GLint texture_level = 0;
glGetFramebufferAttachmentParameteriv(target, attachment,
GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
&texture_level);
return getTextureLevelFormat(object_name, texture_level);
} else {
std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
return GL_NONE;
}
}
image::Image *
getDrawBufferImage(GLenum format) {
GLint channels = __gl_format_channels(format);
if (channels > 4) {
return NULL;
}
GLint draw_framebuffer = 0;
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &draw_framebuffer);
GLint draw_buffer = GL_NONE;
GLint width, height;
if (draw_framebuffer) {
glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
if (draw_buffer == GL_NONE) {
return NULL;
}
if (!getFramebufferAttachmentSize(GL_DRAW_FRAMEBUFFER, draw_buffer, &width, &height)) {
return NULL;
}
} else {
glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
if (draw_buffer == GL_NONE) {
return NULL;
}
if (!getDrawableBounds(&width, &height)) {
return NULL;
}
}
image::Image *image = new image::Image(width, height, channels, true);
if (!image) {
return NULL;
}
while (glGetError() != GL_NO_ERROR) {}
GLint read_framebuffer = 0;
glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
GLint read_buffer = 0;
glGetIntegerv(GL_READ_BUFFER, &read_buffer);
glReadBuffer(draw_buffer);