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st: decompress_with_blit() path for glGetTexImage().

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Decompress a texture by rendering a textured quad.
This commit is contained in:
Brian Paul 2009-04-15 09:37:22 -06:00
parent 49b40f9bf4
commit 51b339af2e
1 changed files with 81 additions and 2 deletions
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83
src/mesa/state_tracker/st_cb_texture.c
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@ -55,6 +55,7 @@
#include "pipe/p_inlines.h"
#include "util/u_tile.h"
#include "util/u_blit.h"
#include "util/u_surface.h"
#define DBG if (0) printf
@ -817,6 +818,72 @@ st_CompressedTexImage2D(GLcontext *ctx, GLenum target, GLint level,
}
/**
* glGetTexImage() helper: decompress a compressed texture by rendering
* a textured quad. Store the results in the user's buffer.
* XXX unfinished business: decompress sRGB texture
*/
static void
decompress_with_blit(GLcontext * ctx, GLenum target, GLint level,
GLenum format, GLenum type, GLvoid *pixels,
struct gl_texture_object *texObj,
struct gl_texture_image *texImage)
{
struct pipe_screen *screen = ctx->st->pipe->screen;
struct st_texture_image *stImage = st_texture_image(texImage);
const GLuint width = texImage->Width;
const GLuint height = texImage->Height;
struct pipe_surface *dst_surface;
struct pipe_texture *dst_texture;
struct pipe_transfer *tex_xfer;
GLuint row;
/* create temp / dest surface */
if (!util_create_rgba_surface(screen, width, height,
&dst_texture, &dst_surface)) {
_mesa_problem(ctx, "util_create_rgba_surface() failed "
"in decompress_with_blit()");
return;
}
/* blit/render/decompress */
util_blit_pixels_tex(ctx->st->blit,
stImage->pt, /* pipe_texture (src) */
0, 0, /* src x0, y0 */
width, height, /* src x1, y1 */
dst_surface, /* pipe_surface (dst) */
0, 0, /* dst x0, y0 */
width, height, /* dst x1, y1 */
0.0, /* z */
PIPE_TEX_MIPFILTER_NEAREST);
/* map the dst_surface so we can read from it */
tex_xfer = screen->get_tex_transfer(screen, dst_texture, 0, 0, 0,
PIPE_TRANSFER_READ,
0, 0, width, height);
/* copy/pack data into user buffer */
/* XXX: to do: look for cases where we can just memcpy() */
for (row = 0; row < height; row++) {
const GLbitfield transferOps = 0x0; /* bypassed for glGetTexImage() */
GLfloat rgba[4 * MAX_WIDTH];
GLvoid *dest = _mesa_image_address2d(&ctx->Pack, pixels, width, height,
format, type, row, 0);
/* get float[4] rgba row from surface */
pipe_get_tile_rgba(tex_xfer, 0, row, width, 1, rgba);
_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
format, type, dest, &ctx->Pack, transferOps);
}
/* destroy the temp / dest surface */
util_destroy_rgba_surface(dst_texture, dst_surface);
}
/**
* Need to map texture image into memory before copying image data,
* then unmap it.
@ -825,7 +892,7 @@ static void
st_get_tex_image(GLcontext * ctx, GLenum target, GLint level,
GLenum format, GLenum type, GLvoid * pixels,
struct gl_texture_object *texObj,
struct gl_texture_image *texImage, GLboolean compressed)
struct gl_texture_image *texImage, GLboolean compressed_dst)
{
struct st_texture_image *stImage = st_texture_image(texImage);
const GLuint dstImageStride =
@ -834,6 +901,18 @@ st_get_tex_image(GLcontext * ctx, GLenum target, GLint level,
GLuint depth, i;
GLubyte *dest;
if (stImage->pt &&
pf_is_compressed(stImage->pt->format) &&
!compressed_dst) {
/* Need to decompress the texture.
* We'll do this by rendering a textured quad.
* Note that we only expect RGBA formats (no Z/depth formats).
*/
decompress_with_blit(ctx, target, level, format, type, pixels,
texObj, texImage);
return;
}
/* Map */
if (stImage->pt) {
/* Image is stored in hardware format in a buffer managed by the
@ -863,7 +942,7 @@ st_get_tex_image(GLcontext * ctx, GLenum target, GLint level,
dest = (GLubyte *) pixels;
for (i = 0; i < depth; i++) {
if (compressed) {
if (compressed_dst) {
_mesa_get_compressed_teximage(ctx, target, level, dest,
texObj, texImage);
}