The memory layout of compatible internal formats may differ in bytes per
block, so TexFormat is not a reliable measure of compatibility. Additionally,
the current check allows compressed textures of the same block size to be used,
which is in violation of the spec.
v2: Use a switch instead of array iteration for block class and show the
correct GL error when internal formats are mismatched.
---
src/mesa/main/copyimage.c | 112 +++++++++++++++++++++++++++++++++++++---------
1 file changed, 91 insertions(+), 21 deletions(-)
diff --git a/src/mesa/main/copyimage.c b/src/mesa/main/copyimage.c
index 455929d..eaedaa6 100644
--- a/src/mesa/main/copyimage.c
+++ b/src/mesa/main/copyimage.c
@@ -33,6 +33,12 @@
#include "texobj.h"
#include "fbobject.h"
#include "textureview.h"
+#include "glformats.h"
+
+enum mesa_block_class {
+ BLOCK_CLASS_128_BITS,
+ BLOCK_CLASS_64_BITS
+};
static bool
prepare_target(struct gl_context *ctx, GLuint name, GLenum *target, int level,
@@ -253,6 +259,85 @@ check_region_bounds(struct gl_context *ctx,
struct gl_texture_image *tex_image,
return true;
}
+static bool
+compressed_format_compatible(struct gl_context *ctx,
+ GLenum compressedFormat, GLenum otherFormat)
+{
+ enum mesa_block_class compressedClass, otherClass;
+
+ /* Two different compressed formats are never compatible. */
+ if (_mesa_is_compressed_format(ctx, otherFormat)) {
+ return false;
+ }
+
+ switch (compressedFormat) {
+ case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+ case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+ case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+ case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+ case GL_COMPRESSED_RG_RGTC2:
+ case GL_COMPRESSED_SIGNED_RG_RGTC2:
+ case GL_COMPRESSED_RGBA_BPTC_UNORM:
+ case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM:
+ case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT:
+ case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT:
+ compressedClass = BLOCK_CLASS_128_BITS;
+ break;
+ case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_RED_RGTC1:
+ case GL_COMPRESSED_SIGNED_RED_RGTC1:
+ compressedClass = BLOCK_CLASS_64_BITS;
+ break;
+ default:
+ return false;
+ }
+
+ switch (otherFormat) {
+ case GL_RGBA32UI:
+ case GL_RGBA32I:
+ case GL_RGBA32F:
+ otherClass = BLOCK_CLASS_128_BITS;
+ break;
+ case GL_RGBA16F:
+ case GL_RG32F:
+ case GL_RGBA16UI:
+ case GL_RG32UI:
+ case GL_RGBA16I:
+ case GL_RG32I:
+ case GL_RGBA16:
+ case GL_RGBA16_SNORM:
+ otherClass = BLOCK_CLASS_64_BITS;
+ break;
+ default:
+ return false;
+ }
+
+ return compressedClass == otherClass;
+}
+
+static bool
+copy_format_compatible(struct gl_context *ctx,
+ GLenum srcFormat, GLenum dstFormat)
+{
+ if (srcFormat == dstFormat) {
+ return true;
+ }
+ else if (_mesa_is_compressed_format(ctx, srcFormat)) {
+ return compressed_format_compatible(ctx, srcFormat, dstFormat);
+ }
+ else if (_mesa_is_compressed_format(ctx, dstFormat)) {
+ return compressed_format_compatible(ctx, dstFormat, srcFormat);
+ }
+ else {
+ return _mesa_texture_view_compatible_format(ctx,
+ srcFormat,
+ dstFormat);
+ }
+}
+
void GLAPIENTRY
_mesa_CopyImageSubData(GLuint srcName, GLenum srcTarget, GLint srcLevel,
GLint srcX, GLint srcY, GLint srcZ,
@@ -265,7 +350,7 @@ _mesa_CopyImageSubData(GLuint srcName, GLenum
srcTarget, GLint srcLevel,
struct gl_texture_object *srcTexObj, *dstTexObj;
struct gl_texture_image *srcTexImage, *dstTexImage;
GLuint src_bw, src_bh, dst_bw, dst_bh;
- int i, srcNewZ, dstNewZ, Bpt;
+ int i, srcNewZ, dstNewZ;
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glCopyImageSubData(%u, %s, %d, %d, %d, %d, "
@@ -306,15 +391,6 @@ _mesa_CopyImageSubData(GLuint srcName, GLenum
srcTarget, GLint srcLevel,
goto cleanup;
}
- /* Very simple sanity check. This is sufficient if one of the textures
- * is compressed. */
- Bpt = _mesa_get_format_bytes(srcTexImage->TexFormat);
- if (_mesa_get_format_bytes(dstTexImage->TexFormat) != Bpt) {
- _mesa_error(ctx, GL_INVALID_VALUE,
- "glCopyImageSubData(internalFormat mismatch)");
- goto cleanup;
- }
-
if (!check_region_bounds(ctx, srcTexImage, srcX, srcY, srcZ,
srcWidth, srcHeight, srcDepth, "src"))
goto cleanup;
@@ -324,17 +400,11 @@ _mesa_CopyImageSubData(GLuint srcName, GLenum
srcTarget, GLint srcLevel,
(srcHeight / src_bh) * dst_bh, srcDepth, "dst"))
goto cleanup;
- if (_mesa_is_format_compressed(srcTexImage->TexFormat)) {
- /* XXX: Technically, we should probaby do some more specific checking
- * here. However, this should be sufficient for all compressed
- * formats that mesa supports since it is a direct memory copy.
- */
- } else if (_mesa_is_format_compressed(dstTexImage->TexFormat)) {
- } else if (_mesa_texture_view_compatible_format(ctx,
- srcTexImage->InternalFormat,
-
dstTexImage->InternalFormat)) {
- } else {
- return; /* Error logged by _mesa_texture_view_compatible_format */
+ if (!copy_format_compatible(ctx, srcTexImage->InternalFormat,
+ dstTexImage->InternalFormat)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glCopyImageSubData(internalFormat mismatch)");
+ goto cleanup;
}
for (i = 0; i < srcDepth; ++i) {
--
2.1.0
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