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Fixed OpenGL vertex buffer function usage (issue #489.)

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The functions will be assigned to their core version counterparts if the extension version isn't supported but the core version is.
This commit is contained in:
Alex Szpakowski
2013-02-19 03:17:05 -04:00
parent 23968d3b4a
commit 5bf78f891d
1 changed files with 19 additions and 2 deletions
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src/modules/graphics/opengl/OpenGL.cpp
+19 -2
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@@ -46,9 +46,8 @@ void initializeContext()
contextInitialized = true;
textureUnits.clear();
// initialize multiple texture unit support for shaders, if available
textureUnits.clear();
if (Shader::isSupported())
{
GLint maxtextureunits;
@@ -78,6 +77,24 @@ void initializeContext()
glGetIntegerv(GL_TEXTURE_BINDING_2D, (GLint *) &textureUnits[0]);
}
// The functionality of the core and ARB VBOs are identical, so we can
// assign the pointers of the core functions to the names of the ARB
// functions, if the latter isn't supported but the former is.
if (GLEE_VERSION_1_5 && !GLEE_ARB_vertex_buffer_object)
{
glBindBufferARB = (GLEEPFNGLBINDBUFFERARBPROC) glBindBuffer;
glBufferDataARB = (GLEEPFNGLBUFFERDATAARBPROC) glBufferData;
glBufferSubDataARB = (GLEEPFNGLBUFFERSUBDATAARBPROC) glBufferSubData;
glDeleteBuffersARB = (GLEEPFNGLDELETEBUFFERSARBPROC) glDeleteBuffers;
glGenBuffersARB = (GLEEPFNGLGENBUFFERSARBPROC) glGenBuffers;
glGetBufferParameterivARB = (GLEEPFNGLGETBUFFERPARAMETERIVARBPROC) glGetBufferParameteriv;
glGetBufferPointervARB = (GLEEPFNGLGETBUFFERPOINTERVARBPROC) glGetBufferPointerv;
glGetBufferSubDataARB = (GLEEPFNGLGETBUFFERSUBDATAARBPROC) glGetBufferSubData;
glIsBufferARB = (GLEEPFNGLISBUFFERARBPROC) glIsBuffer;
glMapBufferARB = (GLEEPFNGLMAPBUFFERARBPROC) glMapBuffer;
glUnmapBufferARB = (GLEEPFNGLUNMAPBUFFERARBPROC) glUnmapBuffer;
}
// Set the 'default' texture (id 0) as a repeating white pixel.
// Otherwise, texture2D inside a shader would return black when drawing graphics primitives,
// which would create the need to use different "passthrough" shaders for untextured primitives vs images.