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mesa: code refactoring to eliminate a switch stmt in bind_buffer_object()

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This commit is contained in:
Brian Paul
2009-10-27 20:10:30 -06:00
parent b44304efde
commit dd5691e802
1 changed files with 46 additions and 67 deletions
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111
src/mesa/main/bufferobj.c
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@@ -51,52 +51,56 @@
#endif
/**
* Return pointer to address of a buffer object target.
* \param ctx the GL context
* \param target the buffer object target to be retrieved.
* \return pointer to pointer to the buffer object bound to \c target in the
* specified context or \c NULL if \c target is invalid.
*/
static INLINE struct gl_buffer_object **
get_buffer_target(GLcontext *ctx, GLenum target)
{
switch (target) {
case GL_ARRAY_BUFFER_ARB:
return &ctx->Array.ArrayBufferObj;
case GL_ELEMENT_ARRAY_BUFFER_ARB:
return &ctx->Array.ElementArrayBufferObj;
case GL_PIXEL_PACK_BUFFER_EXT:
return &ctx->Pack.BufferObj;
case GL_PIXEL_UNPACK_BUFFER_EXT:
return &ctx->Unpack.BufferObj;
case GL_COPY_READ_BUFFER:
if (ctx->Extensions.ARB_copy_buffer) {
return &ctx->CopyReadBuffer;
}
break;
case GL_COPY_WRITE_BUFFER:
if (ctx->Extensions.ARB_copy_buffer) {
return &ctx->CopyWriteBuffer;
}
break;
default:
return NULL;
}
return NULL;
}
/**
* Get the buffer object bound to the specified target in a GL context.
*
* \param ctx GL context
* \param target Buffer object target to be retrieved. Currently this must
* be either \c GL_ARRAY_BUFFER or \c GL_ELEMENT_ARRAY_BUFFER.
* \return A pointer to the buffer object bound to \c target in the
* \param ctx the GL context
* \param target the buffer object target to be retrieved.
* \return pointer to the buffer object bound to \c target in the
* specified context or \c NULL if \c target is invalid.
*/
static INLINE struct gl_buffer_object *
get_buffer(GLcontext *ctx, GLenum target)
{
struct gl_buffer_object * bufObj = NULL;
switch (target) {
case GL_ARRAY_BUFFER_ARB:
bufObj = ctx->Array.ArrayBufferObj;
break;
case GL_ELEMENT_ARRAY_BUFFER_ARB:
bufObj = ctx->Array.ElementArrayBufferObj;
break;
case GL_PIXEL_PACK_BUFFER_EXT:
bufObj = ctx->Pack.BufferObj;
break;
case GL_PIXEL_UNPACK_BUFFER_EXT:
bufObj = ctx->Unpack.BufferObj;
break;
case GL_COPY_READ_BUFFER:
if (ctx->Extensions.ARB_copy_buffer) {
bufObj = ctx->CopyReadBuffer;
}
break;
case GL_COPY_WRITE_BUFFER:
if (ctx->Extensions.ARB_copy_buffer) {
bufObj = ctx->CopyWriteBuffer;
}
break;
default:
/* error must be recorded by caller */
struct gl_buffer_object **bufObj = get_buffer_target(ctx, target);
if (bufObj)
return *bufObj;
return NULL;
}
/* bufObj should point to NullBufferObj or a user-created buffer object */
ASSERT(bufObj);
return bufObj;
}
@@ -552,6 +556,7 @@ _mesa_init_buffer_objects( GLcontext *ctx )
/**
* Bind the specified target to buffer for the specified context.
* Called by glBindBuffer() and other functions.
*/
static void
bind_buffer_object(GLcontext *ctx, GLenum target, GLuint buffer)
@@ -560,40 +565,14 @@ bind_buffer_object(GLcontext *ctx, GLenum target, GLuint buffer)
struct gl_buffer_object *newBufObj = NULL;
struct gl_buffer_object **bindTarget = NULL;
switch (target) {
case GL_ARRAY_BUFFER_ARB:
bindTarget = &ctx->Array.ArrayBufferObj;
break;
case GL_ELEMENT_ARRAY_BUFFER_ARB:
bindTarget = &ctx->Array.ElementArrayBufferObj;
break;
case GL_PIXEL_PACK_BUFFER_EXT:
bindTarget = &ctx->Pack.BufferObj;
break;
case GL_PIXEL_UNPACK_BUFFER_EXT:
bindTarget = &ctx->Unpack.BufferObj;
break;
case GL_COPY_READ_BUFFER:
if (ctx->Extensions.ARB_copy_buffer) {
bindTarget = &ctx->CopyReadBuffer;
}
break;
case GL_COPY_WRITE_BUFFER:
if (ctx->Extensions.ARB_copy_buffer) {
bindTarget = &ctx->CopyWriteBuffer;
}
break;
default:
; /* no-op / we'll hit the follow error test next */
}
bindTarget = get_buffer_target(ctx, target);
if (!bindTarget) {
_mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferARB(target 0x%x)");
return;
}
/* Get pointer to old buffer object (to be unbound) */
oldBufObj = get_buffer(ctx, target);
oldBufObj = *bindTarget;
if (oldBufObj && oldBufObj->Name == buffer)
return; /* rebinding the same buffer object- no change */