/**
* This is the software fallback for Driver.GetTexImage().
* All error checking will have been done before this routine is called.
* We'll call ctx->Driver.MapTextureImage() to access the data, then
* unmap with ctx->Driver.UnmapTextureImage().
*/
void
_mesa_get_teximage(struct gl_context *ctx,
GLenum format, GLenum type, GLvoid *pixels,
struct gl_texture_image *texImage)
{
GLuint dimensions;
switch (texImage->TexObject->Target) {
case GL_TEXTURE_1D:
dimensions = 1;
break;
case GL_TEXTURE_3D:
dimensions = 3;
break;
default:
dimensions = 2;
}
/* map dest buffer, if PBO */
if (_mesa_is_bufferobj(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.MapBufferRange(ctx, 0, ctx->Pack.BufferObj->Size,
GL_MAP_WRITE_BIT, ctx->Pack.BufferObj);
if (!buf) {
/* out of memory or other unexpected error */
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage(map PBO failed)");
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);
}
if (get_tex_memcpy(ctx, format, type, pixels, texImage)) {
/* all done */
}
else if (format == GL_DEPTH_COMPONENT) {
get_tex_depth(ctx, dimensions, format, type, pixels, texImage);
}
else if (format == GL_DEPTH_STENCIL_EXT) {
get_tex_depth_stencil(ctx, dimensions, format, type, pixels, texImage);
}
else if (format == GL_YCBCR_MESA) {
get_tex_ycbcr(ctx, dimensions, format, type, pixels, texImage);
}
else {
get_tex_rgba(ctx, dimensions, format, type, pixels, texImage);
}
if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
ctx->Driver.UnmapBuffer(ctx, ctx->Pack.BufferObj);
}
}
/**
* This is the software fallback for Driver.GetTexImage().
* All error checking will have been done before this routine is called.
* The texture image must be mapped.
*/
void
_mesa_get_teximage(GLcontext *ctx, GLenum target, GLint level,
GLenum format, GLenum type, GLvoid *pixels,
struct gl_texture_object *texObj,
struct gl_texture_image *texImage)
{
GLuint dimensions;
/* If we get here, the texture image should be mapped */
assert(texImage->Data);
switch (target) {
case GL_TEXTURE_1D:
dimensions = 1;
break;
case GL_TEXTURE_3D:
dimensions = 3;
break;
default:
dimensions = 2;
}
if (_mesa_is_bufferobj(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) {
/* out of memory or other unexpected error */
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage(map PBO failed)");
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);
}
if (get_tex_memcpy(ctx, format, type, pixels, texObj, texImage)) {
/* all done */
}
else if (format == GL_COLOR_INDEX) {
get_tex_color_index(ctx, dimensions, format, type, pixels, texImage);
}
else if (format == GL_DEPTH_COMPONENT) {
get_tex_depth(ctx, dimensions, format, type, pixels, texImage);
}
else if (format == GL_DEPTH_STENCIL_EXT) {
get_tex_depth_stencil(ctx, dimensions, format, type, pixels, texImage);
}
else if (format == GL_YCBCR_MESA) {
get_tex_ycbcr(ctx, dimensions, format, type, pixels, texImage);
}
else if (_mesa_get_format_color_encoding(texImage->TexFormat) == GL_SRGB) {
get_tex_srgb(ctx, dimensions, format, type, pixels, texImage);
}
else {
get_tex_rgba(ctx, dimensions, format, type, pixels, texImage);
}
if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
ctx->Pack.BufferObj);
}
}
