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Cleaned up love.graphics.Framebuffer code, using GLee to check for support instead

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This commit is contained in:
Bill Meltsner
2010-11-10 16:57:41 -05:00
parent 500e0f1417
commit ba44886cf4
2 changed files with 128 additions and 177 deletions
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src/modules/graphics/opengl/Framebuffer.cpp
+6 -176
View File
@@ -1,183 +1,18 @@
#include "Framebuffer.h"
#include <common/Matrix.h>
#include <string.h>
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <algorithm>
#include <iterator>
using namespace std;
namespace {
// functions to get opengl capabilities at runtime
vector<string> tokenize(const string& str)
{
vector<string> tokens;
istringstream iss( str );
copy(istream_iterator<string>(iss), istream_iterator<string>(),
back_inserter< vector<string> >(tokens));
return tokens;
}
float getOpenGLVersionNumber()
{
vector<string> tokens = tokenize( (const char*)glGetString(GL_VERSION) );
stringstream toNumber( tokens.at(0) );
double version;
toNumber >> version;
return version;
}
bool hasFramebufferExtension()
{
vector<string> ext = tokenize( (const char*)glGetString(GL_EXTENSIONS) );
return find(ext.begin(), ext.end(), "GL_EXT_framebuffer_object") != ext.end();
}
// strategy for fbo creation, interchangable at runtime:
// none, opengl >= 3.0, extensions
struct FramebufferStrategy {
/// create a new framebuffer, depthbuffer and texture
/**
* @param[out] framebuffer Framebuffer name
* @param[out] depthbuffer Depthbuffer name
* @param[out] img Texture name
* @param[in] width Width of framebuffer
* @param[in] height Height of framebuffer
* @return Creation status
*/
virtual GLenum createFBO(GLuint& framebuffer, GLuint& depthbuffer, GLuint& img, int width, int height)
{ return GL_FRAMEBUFFER_UNSUPPORTED; }
/// remove objects
/**
* @param[in] framebuffer Framebuffer name
* @param[in] depthbuffer Depthbuffer name
* @param[in] img Texture name
*/
virtual void deleteFBO(GLuint framebuffer, GLuint depthbuffer, GLuint img) {}
virtual void bindFBO(GLuint framebuffer) {}
};
#ifdef GL_VERSION_3_0
struct FramebufferStrategyGL3 : public FramebufferStrategy {
virtual GLenum createFBO(GLuint& framebuffer, GLuint& depthbuffer, GLuint& img, int width, int height)
{
// generate depth buffer
glGenRenderbuffers(1, &depthbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, depthbuffer);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, width, height);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
// generate texture save target
glGenTextures(1, &img);
glBindTexture(GL_TEXTURE_2D, img);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height,
0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
// create framebuffer
glGenFramebuffers(1, &framebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, img, 0);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, depthbuffer);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
// unbind buffers and texture
glBindFramebuffer(GL_FRAMEBUFFER, 0);
return status;
}
virtual void deleteFBO(GLuint framebuffer, GLuint depthbuffer, GLuint img)
{
glDeleteTextures(1, &img);
glDeleteRenderbuffers(1, &depthbuffer);
glDeleteFramebuffers(1, &framebuffer);
}
virtual void bindFBO(GLuint framebuffer)
{
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
}
};
#endif
struct FramebufferStrategyEXT : public FramebufferStrategy {
virtual GLenum createFBO(GLuint& framebuffer, GLuint& depthbuffer, GLuint& img, int width, int height)
{
// generate depth buffer
glGenRenderbuffersEXT(1, &depthbuffer);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, depthbuffer);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16, width, height);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
// generate texture save target
glGenTextures(1, &img);
glBindTexture(GL_TEXTURE_2D, img);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height,
0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
// create framebuffer
glGenFramebuffersEXT(1, &framebuffer);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, img, 0);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depthbuffer);
GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
// unbind buffers and texture
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
return status;
}
virtual void deleteFBO(GLuint framebuffer, GLuint depthbuffer, GLuint img)
{
glDeleteTextures(1, &img);
glDeleteRenderbuffersEXT(1, &depthbuffer);
glDeleteFramebuffersEXT(1, &framebuffer);
}
virtual void bindFBO(GLuint framebuffer)
{
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer);
}
};
FramebufferStrategy* strategy = NULL;
FramebufferStrategy strategyNone;
#ifdef GL_VERSION_3_0
FramebufferStrategyGL3 strategyGL3;
#endif
FramebufferStrategyEXT strategyEXT;
};
namespace love
{
namespace graphics
{
namespace opengl
{
{
Framebuffer* Framebuffer::current = NULL;
Framebuffer::Framebuffer(int width, int height) :
width(width), height(height)
{
strategy = NULL;
// world coordinates
vertices[0].x = 0; vertices[0].y = 0;
@@ -192,17 +27,12 @@ namespace opengl
vertices[3].s = 1; vertices[3].t = 1;
if (!strategy) {
#ifdef GL_VERSION_3_0
if (getOpenGLVersionNumber() >= 3.0)
if (GLEE_VERSION_3_0 || GLEE_ARB_framebuffer_object)
strategy = &strategyGL3;
else if (hasFramebufferExtension())
#else
if (hasFramebufferExtension())
#endif
strategy = &strategyEXT;
else if (GLEE_EXT_framebuffer_object)
strategy = &strategyEXT;
else
strategy = &strategyNone;
strategy = &strategyNone;
}
loadVolatile();
src/modules/graphics/opengl/Framebuffer.h
+122 -1
View File
@@ -6,7 +6,6 @@
#include <image/Image.h>
#include <image/ImageData.h>
#include <common/math.h>
#include <map>
#include "GLee.h"
namespace love
@@ -15,6 +14,120 @@ namespace graphics
{
namespace opengl
{
// strategy for fbo creation, interchangable at runtime:
// none, opengl >= 3.0, extensions
struct FramebufferStrategy {
/// create a new framebuffer, depthbuffer and texture
/**
* @param[out] framebuffer Framebuffer name
* @param[out] depthbuffer Depthbuffer name
* @param[out] img Texture name
* @param[in] width Width of framebuffer
* @param[in] height Height of framebuffer
* @return Creation status
*/
virtual GLenum createFBO(GLuint&, GLuint&, GLuint&, int, int)
{ return GL_FRAMEBUFFER_UNSUPPORTED; }
/// remove objects
/**
* @param[in] framebuffer Framebuffer name
* @param[in] depthbuffer Depthbuffer name
* @param[in] img Texture name
*/
virtual void deleteFBO(GLuint, GLuint, GLuint) {}
virtual void bindFBO(GLuint) {}
};
struct FramebufferStrategyGL3 : public FramebufferStrategy {
virtual GLenum createFBO(GLuint& framebuffer, GLuint& depthbuffer, GLuint& img, int width, int height)
{
// generate depth buffer
glGenRenderbuffers(1, &depthbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, depthbuffer);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, width, height);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
// generate texture save target
glGenTextures(1, &img);
glBindTexture(GL_TEXTURE_2D, img);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height,
0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
// create framebuffer
glGenFramebuffers(1, &framebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, img, 0);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, depthbuffer);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
// unbind buffers and texture
glBindFramebuffer(GL_FRAMEBUFFER, 0);
return status;
}
virtual void deleteFBO(GLuint framebuffer, GLuint depthbuffer, GLuint img)
{
glDeleteTextures(1, &img);
glDeleteRenderbuffers(1, &depthbuffer);
glDeleteFramebuffers(1, &framebuffer);
}
virtual void bindFBO(GLuint framebuffer)
{
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
}
};
struct FramebufferStrategyEXT : public FramebufferStrategy {
virtual GLenum createFBO(GLuint& framebuffer, GLuint& depthbuffer, GLuint& img, int width, int height)
{
// generate depth buffer
glGenRenderbuffersEXT(1, &depthbuffer);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, depthbuffer);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16, width, height);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
// generate texture save target
glGenTextures(1, &img);
glBindTexture(GL_TEXTURE_2D, img);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height,
0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
// create framebuffer
glGenFramebuffersEXT(1, &framebuffer);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, img, 0);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, depthbuffer);
GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
// unbind buffers and texture
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
return status;
}
virtual void deleteFBO(GLuint framebuffer, GLuint depthbuffer, GLuint img)
{
glDeleteTextures(1, &img);
glDeleteRenderbuffersEXT(1, &depthbuffer);
glDeleteFramebuffersEXT(1, &framebuffer);
}
virtual void bindFBO(GLuint framebuffer)
{
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer);
}
};
class Framebuffer : public Drawable, public Volatile
{
@@ -46,6 +159,14 @@ namespace opengl
vertex vertices[4];
GLenum status;
FramebufferStrategy* strategy;
FramebufferStrategy strategyNone;
FramebufferStrategyGL3 strategyGL3;
FramebufferStrategyEXT strategyEXT;
};
} // opengl