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support for OpenGL 2.0

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* use OpenGL 2.0 auxiliary buffers when FBO is not supported, thus this means that OpenGL 3 is not a requirement anymore, so otclient might work in older video cards
* map zooming will never work well with Opengl 2.0 because of glCopyTexSubImage2D limitation
This commit is contained in:
Eduardo Bart
2012-03-20 19:26:07 -03:00
parent 5c35938a92
commit 01d5fad315
5 changed files with 78 additions and 26 deletions
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82
src/framework/graphics/framebuffer.cpp
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@@ -25,30 +25,52 @@
#include "texture.h"
uint FrameBuffer::boundFbo = 0;
std::vector<bool> auxBuffers;
FrameBuffer::FrameBuffer()
{
m_clearColor = Color::alpha;
glGenFramebuffers(1, &m_fbo);
if(!m_fbo)
logFatal("Unable to create framebuffer object");
internalCreate();
}
FrameBuffer::FrameBuffer(const Size& size)
{
m_clearColor = Color::alpha;
glGenFramebuffers(1, &m_fbo);
if(!m_fbo)
logFatal("Unable to create framebuffer object");
internalCreate();
resize(size);
}
void FrameBuffer::internalCreate()
{
if(g_graphics.hasFBO()) {
glGenFramebuffers(1, &m_fbo);
if(!m_fbo)
logFatal("Unable to create framebuffer object");
} else { // use auxiliar buffers when FBOs are not supported
m_fbo = 0;
if(auxBuffers.size() == 0) {
int maxAuxs;
glGetIntegerv(GL_AUX_BUFFERS, &maxAuxs);
auxBuffers.resize(maxAuxs+1, false);
}
for(uint i=1;i<auxBuffers.size();++i) {
if(auxBuffers[i] == false) {
m_fbo = i;
auxBuffers[i] = true;
}
}
if(!m_fbo)
logFatal("There is no available auxiliar buffer for a new framebuffer");
}
}
FrameBuffer::~FrameBuffer()
{
glDeleteFramebuffers(1, &m_fbo);
if(g_graphics.hasFBO()) {
glDeleteFramebuffers(1, &m_fbo);
} else {
auxBuffers[m_fbo] = false;
}
}
void FrameBuffer::resize(const Size& size)
@@ -59,15 +81,19 @@ void FrameBuffer::resize(const Size& size)
if(m_texture && m_texture->getSize() == size)
return;
internalBind();
m_texture = TexturePtr(new Texture(size.width(), size.height(), 4));
m_texture->setSmooth(true);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_texture->getId(), 0);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if(status != GL_FRAMEBUFFER_COMPLETE)
logFatal("Unable to setup framebuffer object");
internalRelease();
if(g_graphics.hasFBO()) {
internalBind();
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_texture->getId(), 0);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if(status != GL_FRAMEBUFFER_COMPLETE)
logFatal("Unable to setup framebuffer object");
internalRelease();
}
}
void FrameBuffer::bind(bool clear)
@@ -115,7 +141,15 @@ void FrameBuffer::internalBind()
if(boundFbo == m_fbo)
return;
assert(boundFbo != m_fbo);
glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
if(g_graphics.hasFBO()) {
glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
} else {
int buffer = GL_AUX0 + m_fbo - 1;
glDrawBuffer(buffer);
glReadBuffer(buffer);
}
m_prevBoundFbo = boundFbo;
boundFbo = m_fbo;
}
@@ -123,6 +157,18 @@ void FrameBuffer::internalBind()
void FrameBuffer::internalRelease()
{
assert(boundFbo == m_fbo);
glBindFramebuffer(GL_FRAMEBUFFER, m_prevBoundFbo);
if(g_graphics.hasFBO()) {
glBindFramebuffer(GL_FRAMEBUFFER, m_prevBoundFbo);
} else {
m_texture->bind();
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, m_texture->getWidth(), m_texture->getHeight());
int buffer = GL_BACK;
if(m_prevBoundFbo != 0)
buffer = GL_AUX0 + m_fbo - 1;
glDrawBuffer(buffer);
glReadBuffer(buffer);
}
boundFbo = m_prevBoundFbo;
}