diff options
author | Brian Paul <[email protected]> | 2004-03-13 18:21:40 +0000 |
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committer | Brian Paul <[email protected]> | 2004-03-13 18:21:40 +0000 |
commit | 7a6b71ef2944bae1718e8167b2faaceb8422071c (patch) | |
tree | 3fb3435f3728f09486d455f6060f06dd42fe0e80 /src/mesa/main/bufferobj.c | |
parent | 5498e8b9f34718aba506421988116ccb1e5e3de7 (diff) |
Implementation of GL_EXT_pixel_buffer_object extension.
Note: extension may not be finalized yet - subject to change!
Note: implementation not fully suitable for h/w implementation yet.
Diffstat (limited to 'src/mesa/main/bufferobj.c')
-rw-r--r-- | src/mesa/main/bufferobj.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c index 882f24526c7..1f9b988d334 100644 --- a/src/mesa/main/bufferobj.c +++ b/src/mesa/main/bufferobj.c @@ -33,6 +33,7 @@ #include "glheader.h" #include "hash.h" #include "imports.h" +#include "image.h" #include "context.h" #include "bufferobj.h" @@ -60,6 +61,12 @@ buffer_object_get_target( GLcontext *ctx, GLenum target, const char * str ) 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; default: _mesa_error(ctx, GL_INVALID_ENUM, "gl%s(target)", str); return NULL; @@ -358,6 +365,59 @@ _mesa_init_buffer_objects( GLcontext *ctx ) } +/** + * When we're about to read pixel data out of a PBO (via glDrawPixels, + * glTexImage, etc) or write data into a PBO (via glReadPixels, + * glGetTexImage, etc) we call this function to check that we're not + * going to read out of bounds. + * + * \param ctx the rendering context + * \param width width of image to read/write + * \param height height of image to read/write + * \param depth depth of image to read/write + * \param format format of image to read/write + * \param type datatype of image to read/write + * \param ptr the user-provided pointer/offset + * \return GL_TRUE if the PBO access is OK, GL_FALSE if the access would + * go out of bounds. + */ +GLboolean +_mesa_validate_pbo_access(const struct gl_pixelstore_attrib *pack, + GLsizei width, GLsizei height, GLsizei depth, + GLenum format, GLenum type, const GLvoid *ptr) +{ + GLvoid *start, *end; + + ASSERT(pack->BufferObj->Name != 0); + + if (pack->BufferObj->Size == 0) + /* no buffer! */ + return GL_FALSE; + + /* get address of first pixel we'll read */ + start = _mesa_image_address(pack, ptr, width, height, + format, type, 0, 0, 0); + + /* get address just past the last pixel we'll read */ + end = _mesa_image_address(pack, ptr, width, height, + format, type, depth-1, height-1, width); + + + if ((const GLubyte *) start > (const GLubyte *) pack->BufferObj->Size) { + /* This will catch negative values / wrap-around */ + return GL_FALSE; + } + if ((const GLubyte *) end > (const GLubyte *) pack->BufferObj->Size) { + /* Image read goes beyond end of buffer */ + return GL_FALSE; + } + + /* OK! */ + return GL_TRUE; +} + + + /**********************************************************************/ /* API Functions */ @@ -407,6 +467,15 @@ _mesa_BindBufferARB(GLenum target, GLuint buffer) case GL_ELEMENT_ARRAY_BUFFER_ARB: ctx->Array.ElementArrayBufferObj = newBufObj; break; + case GL_PIXEL_PACK_BUFFER_EXT: + ctx->Pack.BufferObj = newBufObj; + break; + case GL_PIXEL_UNPACK_BUFFER_EXT: + ctx->Unpack.BufferObj = newBufObj; + break; + default: + _mesa_problem(ctx, "Bad target in _mesa_BindBufferARB"); + return; } /* Pass BindBuffer call to device driver */ @@ -504,6 +573,13 @@ _mesa_DeleteBuffersARB(GLsizei n, const GLuint *ids) _mesa_BindBufferARB( GL_ELEMENT_ARRAY_BUFFER_ARB, 0 ); } + if (ctx->Pack.BufferObj == bufObj) { + _mesa_BindBufferARB( GL_PIXEL_PACK_BUFFER_EXT, 0 ); + } + if (ctx->Unpack.BufferObj == bufObj) { + _mesa_BindBufferARB( GL_PIXEL_UNPACK_BUFFER_EXT, 0 ); + } + /* decrement refcount and delete if <= 0 */ bufObj->DeletePending = GL_TRUE; bufObj->RefCount--; |