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use GL_EXT_framebuffer_object

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This commit is contained in:
Glenn Maynard
2006-07-26 19:18:21 +00:00
parent bfb9266b0f
commit 871826bb2a
3 changed files with 166 additions and 2 deletions
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stepmania/src/RageDisplay_OGL.cpp
+118 -2
View File
@@ -1881,9 +1881,114 @@ void RageDisplay_OGL::UpdateTexture(
delete pImg;
}
class RenderTarget_FramebufferObject: public RenderTarget
{
public:
RenderTarget_FramebufferObject();
~RenderTarget_FramebufferObject();
void Create( const RenderTargetParam &param, int &iTextureWidthOut, int &iTextureHeightOut );
unsigned GetTexture() const { return m_iTexHandle; }
void StartRenderingTo();
void FinishRenderingTo();
private:
unsigned int m_iFrameBufferHandle;
unsigned int m_iTexHandle;
unsigned int m_iDepthBufferHandle;
};
RenderTarget_FramebufferObject::RenderTarget_FramebufferObject()
{
m_iFrameBufferHandle = 0;
m_iTexHandle = 0;
m_iDepthBufferHandle = 0;
}
RenderTarget_FramebufferObject::~RenderTarget_FramebufferObject()
{
if( m_iDepthBufferHandle )
GLExt.glDeleteRenderbuffersEXT( 1, reinterpret_cast<GLuint*>(&m_iDepthBufferHandle) );
if( m_iFrameBufferHandle )
GLExt.glDeleteFramebuffersEXT( 1, reinterpret_cast<GLuint*>(&m_iFrameBufferHandle) );
if( m_iTexHandle )
glDeleteTextures( 1, reinterpret_cast<GLuint*>(&m_iTexHandle) );
}
void RenderTarget_FramebufferObject::Create( const RenderTargetParam &param, int &iTextureWidthOut, int &iTextureHeightOut )
{
FlushGLErrors();
// Allocate OpenGL texture resource
glGenTextures( 1, reinterpret_cast<GLuint*>(&m_iTexHandle) );
ASSERT( m_iTexHandle );
int iTextureWidth = power_of_two( param.iWidth );
int iTextureHeight = power_of_two( param.iHeight );
iTextureWidthOut = iTextureWidth;
iTextureHeightOut = iTextureHeight;
glBindTexture( GL_TEXTURE_2D, m_iTexHandle );
glTexImage2D( GL_TEXTURE_2D, 0, param.bWithAlpha? GL_RGBA8:GL_RGB8,
iTextureWidth, iTextureHeight, 0, param.bWithAlpha? GL_RGBA:GL_RGB, GL_UNSIGNED_BYTE, NULL );
AssertNoGLError();
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
/* Create the framebuffer object. */
GLExt.glGenFramebuffersEXT( 1, reinterpret_cast<GLuint*>(&m_iFrameBufferHandle) );
ASSERT( m_iFrameBufferHandle );
/* Attach the texture to it. */
GLExt.glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, m_iFrameBufferHandle );
GLExt.glFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, m_iTexHandle, 0 );
AssertNoGLError();
/* Attach a depth buffer, if requested. */
if( param.bWithDepthBuffer )
{
GLExt.glGenRenderbuffersEXT( 1, reinterpret_cast<GLuint*>(&m_iDepthBufferHandle) );
ASSERT( m_iDepthBufferHandle );
GLExt.glRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16, iTextureWidth, iTextureHeight );
GLExt.glFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, m_iDepthBufferHandle );
}
GLenum status = GLExt.glCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT );
switch(status)
{
case GL_FRAMEBUFFER_COMPLETE_EXT:
break;
case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
FAIL_M( "GL_FRAMEBUFFER_UNSUPPORTED_EXT" );
break;
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT" ); break;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT" ); break;
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT" ); break;
case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT" ); break;
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT" ); break;
case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT: FAIL_M( "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT" ); break;
default:
ASSERT(0);
}
}
void RenderTarget_FramebufferObject::StartRenderingTo()
{
GLExt.glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, m_iFrameBufferHandle );
}
void RenderTarget_FramebufferObject::FinishRenderingTo()
{
GLExt.glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
}
bool RageDisplay_OGL::SupportsRenderToTexture() const
{
return g_pWind->SupportsRenderToTexture();
return GLExt.m_bGL_EXT_framebuffer_object || g_pWind->SupportsRenderToTexture();
}
/*
@@ -1894,7 +1999,18 @@ bool RageDisplay_OGL::SupportsRenderToTexture() const
unsigned RageDisplay_OGL::CreateRenderTarget( const RenderTargetParam &param, int &iTextureWidthOut, int &iTextureHeightOut )
{
RenderTarget *pTarget = g_pWind->CreateRenderTarget( param, iTextureWidthOut, iTextureHeightOut );
RenderTarget *pTarget;
if( GLExt.m_bGL_EXT_framebuffer_object )
{
RenderTarget_FramebufferObject *pTargetFBO = new RenderTarget_FramebufferObject;
pTargetFBO->Create( param, iTextureWidthOut, iTextureHeightOut );
pTarget = pTargetFBO;
}
else
{
pTarget = g_pWind->CreateRenderTarget( param, iTextureWidthOut, iTextureHeightOut );
}
unsigned iTexture = pTarget->GetTexture();
ASSERT( g_mapRenderTargets.find(iTexture) == g_mapRenderTargets.end() );
stepmania/src/RageDisplay_OGL_Helpers.cpp
+28
View File
@@ -210,6 +210,34 @@ void GLExt_t::Load( LowLevelWindow *pWind )
LOG->Info( "OpenGL shading language: %s", pzVersion );
}
}
m_bGL_EXT_framebuffer_object = HasExtension("GL_EXT_framebuffer_object");
if( m_bGL_EXT_framebuffer_object )
{
func_t funcs[] = {
F( glIsRenderbufferEXT ),
F( glBindRenderbufferEXT ),
F( glDeleteRenderbuffersEXT ),
F( glGenRenderbuffersEXT ),
F( glRenderbufferStorageEXT ),
F( glGetRenderbufferParameterivEXT ),
F( glIsFramebufferEXT ),
F( glBindFramebufferEXT ),
F( glDeleteFramebuffersEXT ),
F( glGenFramebuffersEXT ),
F( glCheckFramebufferStatusEXT ),
F( glFramebufferTexture1DEXT ),
F( glFramebufferTexture2DEXT ),
F( glFramebufferTexture3DEXT ),
F( glFramebufferRenderbufferEXT ),
F( glGetFramebufferAttachmentParameterivEXT ),
F( glGenerateMipmapEXT ),
{ NULL, NULL }
};
if( !LoadAllOrNothing(funcs, pWind) )
m_bGL_EXT_framebuffer_object = false;
}
}
/*
stepmania/src/RageDisplay_OGL_Helpers.h
+20
View File
@@ -95,6 +95,26 @@ struct GLExt_t
bool m_bGL_ARB_shading_language_100;
int m_iShadingLanguageVersion; /* * 100 */
// GL_EXT_framebuffer_object:
bool m_bGL_EXT_framebuffer_object;
PFNGLISRENDERBUFFEREXTPROC glIsRenderbufferEXT;
PFNGLBINDRENDERBUFFEREXTPROC glBindRenderbufferEXT;
PFNGLDELETERENDERBUFFERSEXTPROC glDeleteRenderbuffersEXT;
PFNGLGENRENDERBUFFERSEXTPROC glGenRenderbuffersEXT;
PFNGLRENDERBUFFERSTORAGEEXTPROC glRenderbufferStorageEXT;
PFNGLGETRENDERBUFFERPARAMETERIVEXTPROC glGetRenderbufferParameterivEXT;
PFNGLISFRAMEBUFFEREXTPROC glIsFramebufferEXT;
PFNGLBINDFRAMEBUFFEREXTPROC glBindFramebufferEXT;
PFNGLDELETEFRAMEBUFFERSEXTPROC glDeleteFramebuffersEXT;
PFNGLGENFRAMEBUFFERSEXTPROC glGenFramebuffersEXT;
PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC glCheckFramebufferStatusEXT;
PFNGLFRAMEBUFFERTEXTURE1DEXTPROC glFramebufferTexture1DEXT;
PFNGLFRAMEBUFFERTEXTURE2DEXTPROC glFramebufferTexture2DEXT;
PFNGLFRAMEBUFFERTEXTURE3DEXTPROC glFramebufferTexture3DEXT;
PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC glFramebufferRenderbufferEXT;
PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC glGetFramebufferAttachmentParameterivEXT;
PFNGLGENERATEMIPMAPEXTPROC glGenerateMipmapEXT;
void Load( LowLevelWindow *pWind );
bool HasExtension( const RString &sExt ) const;