diff options
Diffstat (limited to 'src/mesa/main/texstore.c')
| -rw-r--r-- | src/mesa/main/texstore.c | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c index 28f6a191fdb..3280051abf9 100644 --- a/src/mesa/main/texstore.c +++ b/src/mesa/main/texstore.c @@ -4100,26 +4100,26 @@ _mesa_get_teximage(GLcontext *ctx, GLenum target, GLint level, struct gl_texture_object *texObj, struct gl_texture_image *texImage) { - GLuint dimensions = (target == GL_TEXTURE_3D) ? 3 : 2; + const GLuint dimensions = (target == GL_TEXTURE_3D) ? 3 : 2; if (ctx->Pack.BufferObj->Name) { - /* pack texture image into a PBO */ - GLubyte *buf; - if (!_mesa_validate_pbo_access(dimensions, &ctx->Pack, texImage->Width, - texImage->Height, texImage->Depth, - format, type, pixels)) { - _mesa_error(ctx, GL_INVALID_OPERATION, - "glGetTexImage(invalid PBO access)"); - return; - } - buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT, - GL_WRITE_ONLY_ARB, - ctx->Pack.BufferObj); + /* Packing texture image into a PBO. + * Map the (potentially) VRAM-based buffer into our process space so + * we can write into it with the code below. + * A hardware driver might use a sophisticated blit to move the + * texture data to the PBO if the PBO is in VRAM along with the texture. + */ + GLubyte *buf = (GLubyte *) + ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT, + GL_WRITE_ONLY_ARB, ctx->Pack.BufferObj); if (!buf) { /* buffer is already mapped - that's an error */ _mesa_error(ctx, GL_INVALID_OPERATION,"glGetTexImage(PBO is mapped)"); return; } + /* <pixels> was an offset into the PBO. + * Now make it a real, client-side pointer inside the mapped region. + */ pixels = ADD_POINTERS(buf, pixels); } else if (!pixels) { |