}
+static enum pipe_format
+choose_matching_format(struct pipe_screen *screen, unsigned bind,
+ GLenum format, GLenum type, GLboolean swapBytes)
+{
+ gl_format mesa_format;
+
+ for (mesa_format = 1; mesa_format < MESA_FORMAT_COUNT; mesa_format++) {
+ if (_mesa_get_format_color_encoding(mesa_format) == GL_SRGB) {
+ continue;
+ }
+
+ if (_mesa_format_matches_format_and_type(mesa_format, format, type,
+ swapBytes)) {
+ enum pipe_format format = st_mesa_format_to_pipe_format(mesa_format);
+
+ if (format &&
+ screen->is_format_supported(screen, format, PIPE_TEXTURE_2D, 0,
+ bind)) {
+ return format;
+ }
+ /* It's unlikely to find 2 matching Mesa formats. */
+ break;
+ }
+ }
+ return PIPE_FORMAT_NONE;
+}
+
/**
- * glGetTexImage() helper: decompress a compressed texture by rendering
- * a textured quad. Store the results in the user's buffer.
+ * Called via ctx->Driver.GetTexImage()
+ *
+ * This uses a blit to copy the texture to a texture format which matches
+ * the format and type combo and then a fast read-back is done using memcpy.
+ * We can do arbitrary X/Y/Z/W/0/1 swizzling here as long as there is
+ * a format which matches the swizzling.
+ *
+ * If such a format isn't available, it falls back to _mesa_get_teximage.
+ *
+ * NOTE: Drivers usually do a blit to convert between tiled and linear
+ * texture layouts during texture uploads/downloads, so the blit
+ * we do here should be free in such cases.
*/
static void
-decompress_with_blit(struct gl_context * ctx,
- GLenum format, GLenum type, GLvoid *pixels,
- struct gl_texture_image *texImage)
+st_GetTexImage(struct gl_context * ctx,
+ GLenum format, GLenum type, GLvoid * pixels,
+ struct gl_texture_image *texImage)
{
struct st_context *st = st_context(ctx);
struct pipe_context *pipe = st->pipe;
const GLuint width = texImage->Width;
const GLuint height = texImage->Height;
const GLuint depth = texImage->Depth;
+ struct st_texture_image *stImage = st_texture_image(texImage);
struct pipe_resource *src = st_texture_object(texImage->TexObject)->pt;
- struct pipe_resource *dst;
+ struct pipe_resource *dst = NULL;
struct pipe_resource dst_templ;
- enum pipe_format pipe_format;
+ enum pipe_format dst_format, src_format;
gl_format mesa_format;
GLenum gl_target = texImage->TexObject->Target;
enum pipe_texture_target pipe_target;
struct pipe_blit_info blit;
- unsigned bind = (PIPE_BIND_RENDER_TARGET | PIPE_BIND_TRANSFER_READ);
+ unsigned bind = PIPE_BIND_TRANSFER_READ;
struct pipe_transfer *tex_xfer;
- ubyte *map;
+ ubyte *map = NULL;
+ boolean done = FALSE;
+
+ if (!stImage->pt) {
+ goto fallback;
+ }
+
+ /* XXX Fallback to _mesa_get_teximage for depth-stencil formats
+ * due to an incomplete stencil blit implementation in some drivers. */
+ if (format == GL_DEPTH_STENCIL) {
+ goto fallback;
+ }
+
+ /* If the base internal format and the texture format don't match, we have
+ * to fall back to _mesa_get_teximage. */
+ if (texImage->_BaseFormat !=
+ _mesa_get_format_base_format(texImage->TexFormat)) {
+ goto fallback;
+ }
+
+ /* See if the texture format already matches the format and type,
+ * in which case the memcpy-based fast path will be used. */
+ if (_mesa_format_matches_format_and_type(texImage->TexFormat, format,
+ type, ctx->Pack.SwapBytes)) {
+ goto fallback;
+ }
+
+ /* Convert the source format to what is expected by GetTexImage
+ * and see if it's supported.
+ *
+ * This only applies to glGetTexImage:
+ * - Luminance must be returned as (L,0,0,1).
+ * - Luminance alpha must be returned as (L,0,0,A).
+ * - Intensity must be returned as (I,0,0,1)
+ */
+ src_format = util_format_linear(src->format);
+ src_format = util_format_luminance_to_red(src_format);
+ src_format = util_format_intensity_to_red(src_format);
+
+ if (!src_format ||
+ !screen->is_format_supported(screen, src_format, src->target,
+ src->nr_samples,
+ PIPE_BIND_SAMPLER_VIEW)) {
+ goto fallback;
+ }
+
+ if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL)
+ bind |= PIPE_BIND_DEPTH_STENCIL;
+ else
+ bind |= PIPE_BIND_RENDER_TARGET;
/* GetTexImage only returns a single face for cubemaps. */
if (gl_target == GL_TEXTURE_CUBE_MAP) {
gl_target = GL_TEXTURE_2D;
}
-
pipe_target = gl_target_to_pipe(gl_target);
- /* Find the best match for the format+type combo. */
- pipe_format = st_choose_format(st, GL_RGBA8, format, type,
- pipe_target, 0, bind, FALSE);
- if (pipe_format == PIPE_FORMAT_NONE) {
- /* unable to get an rgba format!?! */
- _mesa_problem(ctx, "%s: cannot find a supported format", __func__);
- return;
+ /* Choose the destination format by finding the best match
+ * for the format+type combo. */
+ dst_format = choose_matching_format(screen, bind, format, type,
+ ctx->Pack.SwapBytes);
+
+ if (dst_format == PIPE_FORMAT_NONE) {
+ GLenum dst_glformat;
+
+ /* Fall back to _mesa_get_teximage except for compressed formats,
+ * where decompression with a blit is always preferred. */
+ if (!util_format_is_compressed(src->format)) {
+ goto fallback;
+ }
+
+ /* Set the appropriate format for the decompressed texture.
+ * Luminance and sRGB formats shouldn't appear here.*/
+ switch (src_format) {
+ case PIPE_FORMAT_DXT1_RGB:
+ case PIPE_FORMAT_DXT1_RGBA:
+ case PIPE_FORMAT_DXT3_RGBA:
+ case PIPE_FORMAT_DXT5_RGBA:
+ case PIPE_FORMAT_RGTC1_UNORM:
+ case PIPE_FORMAT_RGTC2_UNORM:
+ case PIPE_FORMAT_ETC1_RGB8:
+ dst_glformat = GL_RGBA8;
+ break;
+ case PIPE_FORMAT_RGTC1_SNORM:
+ case PIPE_FORMAT_RGTC2_SNORM:
+ if (!ctx->Extensions.EXT_texture_snorm)
+ goto fallback;
+ dst_glformat = GL_RGBA8_SNORM;
+ break;
+ /* TODO: for BPTC_*FLOAT, set RGBA32F and check for ARB_texture_float */
+ default:
+ assert(0);
+ goto fallback;
+ }
+
+ dst_format = st_choose_format(st, dst_glformat, format, type,
+ pipe_target, 0, bind, FALSE);
+
+ if (dst_format == PIPE_FORMAT_NONE) {
+ /* unable to get an rgba format!?! */
+ goto fallback;
+ }
}
/* create the destination texture */
memset(&dst_templ, 0, sizeof(dst_templ));
dst_templ.target = pipe_target;
- dst_templ.format = pipe_format;
+ dst_templ.format = dst_format;
dst_templ.bind = bind;
dst_templ.usage = PIPE_USAGE_STAGING;
dst = screen->resource_create(screen, &dst_templ);
if (!dst) {
- _mesa_problem(ctx, "%s: cannot create a temporary texture", __func__);
- return;
+ goto fallback;
}
blit.src.resource = src;
blit.src.level = texImage->Level;
- blit.src.format = util_format_linear(src->format);
+ blit.src.format = src_format;
blit.dst.resource = dst;
blit.dst.level = 0;
blit.dst.format = dst->format;
goto end;
}
- mesa_format = st_pipe_format_to_mesa_format(pipe_format);
+ mesa_format = st_pipe_format_to_mesa_format(dst_format);
/* copy/pack data into user buffer */
if (_mesa_format_matches_format_and_type(mesa_format, format, type,
ctx->Pack.SwapBytes)) {
/* memcpy */
- const uint bytesPerRow = width * util_format_get_blocksize(pipe_format);
+ const uint bytesPerRow = width * util_format_get_blocksize(dst_format);
GLuint row, slice;
for (slice = 0; slice < depth; slice++) {
else {
/* format translation via floats */
GLuint row, slice;
- enum pipe_format pformat = util_format_linear(dst->format);
GLfloat *rgba;
+ assert(util_format_is_compressed(src->format));
+
rgba = malloc(width * 4 * sizeof(GLfloat));
if (!rgba) {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage()");
goto end;
}
/* get float[4] rgba row from surface */
pipe_get_tile_rgba_format(tex_xfer, map, 0, row, width, 1,
- pformat, rgba);
+ dst_format, rgba);
_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba, format,
type, dest, &ctx->Pack, transferOps);
free(rgba);
}
+ done = TRUE;
end:
if (map)
_mesa_unmap_pbo_dest(ctx, &ctx->Pack);
pipe_resource_reference(&dst, NULL);
-}
-
-
-
-/**
- * Called via ctx->Driver.GetTexImage()
- */
-static void
-st_GetTexImage(struct gl_context * ctx,
- GLenum format, GLenum type, GLvoid * pixels,
- struct gl_texture_image *texImage)
-{
- struct st_texture_image *stImage = st_texture_image(texImage);
- if (stImage->pt && util_format_is_s3tc(stImage->pt->format)) {
- /* Need to decompress the texture.
- * We'll do this by rendering a textured quad (which is hopefully
- * faster than using the fallback code in texcompress.c).
- * Note that we only expect RGBA formats (no Z/depth formats).
- */
- decompress_with_blit(ctx, format, type, pixels, texImage);
- }
- else {
+fallback:
+ if (!done) {
_mesa_get_teximage(ctx, format, type, pixels, texImage);
}
}
projects / mesa.git / commitdiff