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mesa: add MapBufferRange driver callbacks

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Will be needed in coming GL extensions (GL_map_buffer_range, GL 3.0).
Will be used by the vbo module to avoid reallocating vbo's at each
draw primitive call.
This commit is contained in:
Keith Whitwell 2009-03-03 10:44:35 +00:00
parent c64a2b7089
commit eb8a1d9642
1 changed files with 26 additions and 0 deletions
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26
src/mesa/main/dd.h
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@ -36,6 +36,22 @@
struct gl_pixelstore_attrib;
struct mesa_display_list;
#if FEATURE_ARB_vertex_buffer_object
/* Modifies GL_MAP_UNSYNCHRONIZED_BIT to allow driver to fail (return
* NULL) if buffer is unavailable for immediate mapping.
*
* Does GL_MAP_INVALIDATE_RANGE_BIT do this? It seems so, but it
* would require more book-keeping in the driver than seems necessary
* at this point.
*
* Does GL_MAP_INVALDIATE_BUFFER_BIT do this? Not really -- we don't
* want to provoke the driver to throw away the old storage, we will
* respect the contents of already referenced data.
*/
#define MESA_MAP_NOWAIT_BIT 0x0040
#endif
/**
* Device driver function table.
* Core Mesa uses these function pointers to call into device drivers.
@ -780,6 +796,16 @@ struct dd_function_table {
void * (*MapBuffer)( GLcontext *ctx, GLenum target, GLenum access,
struct gl_buffer_object *obj );
/* May return NULL if MESA_MAP_NOWAIT_BIT is set in access:
*/
void * (*MapBufferRange)( GLcontext *ctx, GLenum target,
GLintptr offset, GLsizeiptr length, GLbitfield access,
struct gl_buffer_object *obj);
void (*FlushMappedBufferRange) (GLcontext *ctx, GLenum target,
GLintptr offset, GLsizeiptr length,
struct gl_buffer_object *obj);
GLboolean (*UnmapBuffer)( GLcontext *ctx, GLenum target,
struct gl_buffer_object *obj );
/*@}*/