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authorBrian Paul <brianp@vmware.com>2011-09-08 20:16:18 -0600
committerBrian Paul <brianp@vmware.com>2011-09-08 20:16:18 -0600
commit3370ba802ff93fde399c9b07303a71ab0827e217 (patch)
tree1abfdf9478deca4e242412ace674c801bbec58f2
parent9a5b2899e058f3ec31a4eba5575eaa3fcfe1e3f5 (diff)
mesa: new _mesa_decompress_image() function
Use the old texture fetch functions to decompress a whole image. To be used by glGetTexImage().
-rw-r--r--src/mesa/main/texcompress.c86
-rw-r--r--src/mesa/main/texcompress.h5
2 files changed, 91 insertions, 0 deletions
diff --git a/src/mesa/main/texcompress.c b/src/mesa/main/texcompress.c
index 390fc535e92..4e5c14cbba2 100644
--- a/src/mesa/main/texcompress.c
+++ b/src/mesa/main/texcompress.c
@@ -37,6 +37,9 @@
#include "mfeatures.h"
#include "mtypes.h"
#include "texcompress.h"
+#include "texcompress_fxt1.h"
+#include "texcompress_rgtc.h"
+#include "texcompress_s3tc.h"
/**
@@ -438,3 +441,86 @@ _mesa_compressed_image_address(GLint col, GLint row, GLint img,
return (GLubyte *) image + offset;
}
+
+
+/**
+ * Decompress a compressed texture image, returning a GL_RGBA/GL_FLOAT image.
+ */
+void
+_mesa_decompress_image(gl_format format, GLuint width, GLuint height,
+ const GLubyte *src, GLint srcRowStride,
+ GLfloat *dest)
+{
+ void (*fetch)(const struct gl_texture_image *texImage,
+ GLint i, GLint j, GLint k, GLfloat *texel);
+ struct gl_texture_image texImage; /* dummy teximage */
+ GLuint i, j;
+
+ /* setup dummy texture image info */
+ memset(&texImage, 0, sizeof(texImage));
+ texImage.Data = (void *) src;
+ texImage.RowStride = srcRowStride;
+
+ switch (format) {
+ /* DXT formats */
+ case MESA_FORMAT_RGB_DXT1:
+ fetch = _mesa_fetch_texel_2d_f_rgb_dxt1;
+ break;
+ case MESA_FORMAT_RGBA_DXT1:
+ fetch = _mesa_fetch_texel_2d_f_rgba_dxt1;
+ break;
+ case MESA_FORMAT_RGBA_DXT3:
+ fetch = _mesa_fetch_texel_2d_f_rgba_dxt3;
+ break;
+ case MESA_FORMAT_RGBA_DXT5:
+ fetch = _mesa_fetch_texel_2d_f_rgba_dxt5;
+ break;
+
+ /* FXT1 formats */
+ case MESA_FORMAT_RGB_FXT1:
+ fetch = _mesa_fetch_texel_2d_f_rgb_fxt1;
+ break;
+ case MESA_FORMAT_RGBA_FXT1:
+ fetch = _mesa_fetch_texel_2d_f_rgba_fxt1;
+ break;
+
+ /* Red/RG formats */
+ case MESA_FORMAT_RED_RGTC1:
+ fetch = _mesa_fetch_texel_2d_f_red_rgtc1;
+ break;
+ case MESA_FORMAT_SIGNED_RED_RGTC1:
+ fetch = _mesa_fetch_texel_2d_f_signed_red_rgtc1;
+ break;
+ case MESA_FORMAT_RG_RGTC2:
+ fetch = _mesa_fetch_texel_2d_f_rg_rgtc2;
+ break;
+ case MESA_FORMAT_SIGNED_RG_RGTC2:
+ fetch = _mesa_fetch_texel_2d_f_signed_rg_rgtc2;
+ break;
+
+ /* L/LA formats */
+ case MESA_FORMAT_L_LATC1:
+ fetch = _mesa_fetch_texel_2d_f_l_latc1;
+ break;
+ case MESA_FORMAT_SIGNED_L_LATC1:
+ fetch = _mesa_fetch_texel_2d_f_signed_l_latc1;
+ break;
+ case MESA_FORMAT_LA_LATC2:
+ fetch = _mesa_fetch_texel_2d_f_la_latc2;
+ break;
+ case MESA_FORMAT_SIGNED_LA_LATC2:
+ fetch = _mesa_fetch_texel_2d_f_signed_la_latc2;
+ break;
+
+ default:
+ _mesa_problem(NULL, "Unexpected format in _mesa_decompress_image()");
+ return;
+ }
+
+ for (j = 0; j < height; j++) {
+ for (i = 0; i < width; i++) {
+ fetch(&texImage, i, j, 0, dest);
+ dest += 4;
+ }
+ }
+}
diff --git a/src/mesa/main/texcompress.h b/src/mesa/main/texcompress.h
index 375cf90c8a2..2c357068c91 100644
--- a/src/mesa/main/texcompress.h
+++ b/src/mesa/main/texcompress.h
@@ -50,6 +50,11 @@ _mesa_compressed_image_address(GLint col, GLint row, GLint img,
gl_format mesaFormat,
GLsizei width, const GLubyte *image);
+extern void
+_mesa_decompress_image(gl_format format, GLuint width, GLuint height,
+ const GLubyte *src, GLint srcRowStride,
+ GLfloat *dest);
+
#else /* _HAVE_FULL_GL */
/* no-op macros */