Add blend equation function for MRTs

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3661 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COpenGLExtensionHandler.cpp

@@ -73,6 +73,7 @@ COpenGLExtensionHandler::COpenGLExtensionHandler() :
 	pGlProvokingVertexARB(0), pGlProvokingVertexEXT(0),
 	pGlColorMaskIndexedEXT(0), pGlEnableIndexedEXT(0), pGlDisableIndexedEXT(0),
 	pGlBlendFuncIndexedAMD(0), pGlBlendFunciARB(0),
+	pGlBlendEquationIndexedAMD(0), pGlBlendEquationiARB(0),
 	pGlProgramParameteriARB(0), pGlProgramParameteriEXT(0),
 	pGlGenQueriesARB(0), pGlDeleteQueriesARB(0), pGlIsQueryARB(0),
 	pGlBeginQueryARB(0), pGlEndQueryARB(0), pGlGetQueryivARB(0),
@@ -249,6 +250,8 @@ void COpenGLExtensionHandler::initExtensions(bool stencilBuffer)
 	pGlDisableIndexedEXT= (PFNGLDISABLEINDEXEDEXTPROC) wglGetProcAddress("glDisableIndexedEXT");
 	pGlBlendFuncIndexedAMD= (PFNGLBLENDFUNCINDEXEDAMDPROC) wglGetProcAddress("glBlendFuncIndexedAMD");
 	pGlBlendFunciARB= (PFNGLBLENDFUNCIPROC) wglGetProcAddress("glBlendFunciARB");
+	pGlBlendEquationIndexedAMD= (PFNGLBLENDEQUATIONINDEXEDAMDPROC) wglGetProcAddress("glBlendEquationIndexedAMD");
+	pGlBlendEquationiARB= (PFNGLBLENDEQUATIONIPROC) wglGetProcAddress("glBlendEquationiARB");
 	pGlProgramParameteriARB= (PFNGLPROGRAMPARAMETERIARBPROC) wglGetProcAddress("glProgramParameteriARB");
 	pGlProgramParameteriEXT= (PFNGLPROGRAMPARAMETERIEXTPROC) wglGetProcAddress("glProgramParameteriEXT");
 
@@ -571,6 +574,10 @@ void COpenGLExtensionHandler::initExtensions(bool stencilBuffer)
 	IRR_OGL_LOAD_EXTENSION(reinterpret_cast<const GLubyte*>("glBlendFuncIndexedAMD"));
 	pGlBlendFunciARB= (PFNGLBLENDFUNCIPROC)
 	IRR_OGL_LOAD_EXTENSION(reinterpret_cast<const GLubyte*>("glBlendFunciARB"));
+	pGlBlendEquationIndexedAMD= (PFNGLBLENDEQUATIONINDEXEDAMDPROC)
+	IRR_OGL_LOAD_EXTENSION(reinterpret_cast<const GLubyte*>("glBlendEquationIndexedAMD"));
+	pGlBlendEquationiARB= (PFNGLBLENDEQUATIONIPROC)
+	IRR_OGL_LOAD_EXTENSION(reinterpret_cast<const GLubyte*>("glBlendEquationiARB"));
 	pGlProgramParameteriARB = (PFNGLPROGRAMPARAMETERIARBPROC)
 	IRR_OGL_LOAD_EXTENSION(reinterpret_cast<const GLubyte*>("glProgramParameteriARB"));
 	pGlProgramParameteriEXT = (PFNGLPROGRAMPARAMETERIEXTPROC)

source/Irrlicht/COpenGLExtensionHandler.h

@@ -1034,6 +1034,7 @@ class COpenGLExtensionHandler
 	void extGlEnableIndexed(GLenum target, GLuint index);
 	void extGlDisableIndexed(GLenum target, GLuint index);
 	void extGlBlendFuncIndexed(GLuint buf, GLenum src, GLenum dst);
+	void extGlBlendEquationIndexed(GLuint buf, GLenum mode);
 	void extGlProgramParameteri(GLuint program, GLenum pname, GLint value);
 
 	// occlusion query
@@ -1143,6 +1144,8 @@ class COpenGLExtensionHandler
 		PFNGLDISABLEINDEXEDEXTPROC pGlDisableIndexedEXT;
 		PFNGLBLENDFUNCINDEXEDAMDPROC pGlBlendFuncIndexedAMD;
 		PFNGLBLENDFUNCIPROC pGlBlendFunciARB;
+		PFNGLBLENDEQUATIONINDEXEDAMDPROC pGlBlendEquationIndexedAMD;
+		PFNGLBLENDEQUATIONIPROC pGlBlendEquationiARB;
 		PFNGLPROGRAMPARAMETERIARBPROC pGlProgramParameteriARB;
 		PFNGLPROGRAMPARAMETERIEXTPROC pGlProgramParameteriEXT;
 		PFNGLGENQUERIESARBPROC pGlGenQueriesARB;
@@ -2174,6 +2177,23 @@ inline void COpenGLExtensionHandler::extGlBlendFuncIndexed(GLuint buf, GLenum sr
 }
 
 
+inline void COpenGLExtensionHandler::extGlBlendEquationIndexed(GLuint buf, GLenum mode)
+{
+#ifdef _IRR_OPENGL_USE_EXTPOINTER_
+	if (FeatureAvailable[IRR_ARB_draw_buffers_blend] && pGlBlendEquationiARB)
+		pGlBlendEquationiARB(buf, mode);
+	if (FeatureAvailable[IRR_AMD_draw_buffers_blend] && pGlBlendEquationIndexedAMD)
+		pGlBlendEquationIndexedAMD(buf, mode);
+#elif defined(GL_ARB_draw_buffers_blend)
+	glBlendEquationiARB(buf, src, dst);
+#elif defined(GL_AMD_draw_buffers_blend)
+	glBlendEquationIndexedAMD(buf, src, dst);
+#else
+	os::Printer::log("glBlendEquationIndexed not supported", ELL_ERROR);
+#endif
+}
+
+
 inline void COpenGLExtensionHandler::extGlProgramParameteri(GLuint program, GLenum pname, GLint value)
 {
 #if defined(_IRR_OPENGL_USE_EXTPOINTER_)