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From Michael Platings, I've added initial support to osg for glGetProgramBinary and glProgramBinary. This means that shader programs can now be cached to disk and later reloaded, which is much faster than linking shaders from source code. This should mean significantly shorter load times for people who use lots of combinations of shaders.

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This commit is contained in:
Robert Osfield
2011-02-14 12:54:21 +00:00
parent 597f978128
commit 1d55efb721
5 changed files with 266 additions and 54 deletions
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23
include/osg/GL2Extensions
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@@ -284,6 +284,13 @@ typedef char GLchar;
#define GL_INVALID_INDEX 0xFFFFFFFFu
#endif
//ARB_get_program_binary
#ifndef GL_PROGRAM_BINARY_RETRIEVABLE_HINT
#define GL_PROGRAM_BINARY_RETRIEVABLE_HINT 0x8257
#define GL_PROGRAM_BINARY_LENGTH 0x8741
#define GL_NUM_PROGRAM_BINARY_FORMATS 0x87FE
#define GL_PROGRAM_BINARY_FORMATS 0x87FF
#endif
namespace osg {
@@ -326,6 +333,10 @@ class OSG_EXPORT GL2Extensions : public osg::Referenced
void setUniformBufferObjectSupported(bool flag) { _isUniformBufferObjectSupported = flag; }
bool isUniformBufferObjectSupported() {return _isUniformBufferObjectSupported; }
void setGetProgramBinarySupported(bool flag) { _isGetProgramBinarySupported = flag; }
bool isGetProgramBinarySupported() {return _isGetProgramBinarySupported; }
/** Function to call to get the extension of a specified context.
* If the Exentsion object for that context has not yet been created then
* and the 'createIfNotInitalized' flag been set to false then returns NULL.
@@ -480,6 +491,11 @@ class OSG_EXPORT GL2Extensions : public osg::Referenced
void glGetActiveUniformBlockiv(GLuint program, GLuint uniformBlockIndex, GLenum pname, GLint *params) const;
void glGetActiveUniformBlockName(GLuint program, GLuint uniformBlockIndex, GLsizei bufSize, GLsizei *length, GLchar *uniformBlockName) const;
void glUniformBlockBinding(GLuint program, GLuint uniformBlockIndex, GLuint uniformBlockBinding) const;
// ARB_get_program_binary
void glGetProgramBinary(GLuint program, GLsizei bufSize, GLsizei *length, GLenum *binaryFormat, GLvoid *binary) const;
void glProgramBinary(GLuint program, GLenum binaryFormat, const GLvoid *binary, GLsizei length) const;
protected:
~GL2Extensions() {}
@@ -494,6 +510,7 @@ class OSG_EXPORT GL2Extensions : public osg::Referenced
bool _areTessellationShadersSupported;
bool _isGpuShader4Supported;
bool _isUniformBufferObjectSupported;
bool _isGetProgramBinarySupported;
typedef void (GL_APIENTRY * BlendEquationSeparateProc)(GLenum modeRGB, GLenum modeAlpha);
typedef void (GL_APIENTRY * DrawBuffersProc)(GLsizei n, const GLenum *bufs);
@@ -622,6 +639,8 @@ class OSG_EXPORT GL2Extensions : public osg::Referenced
typedef void (GL_APIENTRY * GetActiveUniformBlockivProc)(GLuint program, GLuint uniformBlockIndex, GLenum pname, GLint *params);
typedef void (GL_APIENTRY * GetActiveUniformBlockNameProc)(GLuint program, GLuint uniformBlockIndex, GLsizei bufSize, GLsizei *length, GLchar *uniformBlockName);
typedef void (GL_APIENTRY * UniformBlockBindingProc)(GLuint program, GLuint uniformBlockIndex, GLuint uniformBlockBinding);
typedef void (GL_APIENTRY * GetProgramBinaryProc)(GLuint program, GLsizei bufSize, GLsizei *length, GLenum *binaryFormat, GLvoid *binary);
typedef void (GL_APIENTRY * ProgramBinaryProc)(GLuint program, GLenum binaryFormat, const GLvoid *binary, GLsizei length);
BlendEquationSeparateProc _glBlendEquationSeparate;
DrawBuffersProc _glDrawBuffers;
@@ -761,6 +780,10 @@ class OSG_EXPORT GL2Extensions : public osg::Referenced
GetActiveUniformBlockivProc _glGetActiveUniformBlockiv;
GetActiveUniformBlockNameProc _glGetActiveUniformBlockName;
UniformBlockBindingProc _glUniformBlockBinding;
//ARB_get_program_binary
GetProgramBinaryProc _glGetProgramBinary;
ProgramBinaryProc _glProgramBinary;
};
}