mesa: added swapBytes parameter to _mesa_format_matches_format_and_type()

Not actually used yet though.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/mesa/main/formats.c

@@ -2516,14 +2516,16 @@ _mesa_format_to_type_and_comps(gl_format format,
 /**
  * Check if a gl_format exactly matches a GL formaat/type combination
  * such that we can use memcpy() from one to the other.
- *
- * Note: this matching assumes that GL_PACK/UNPACK_SWAP_BYTES is unset.
- *
+ * \param gl_format  a MESA_FORMAT_x value
+ * \param format  the user-specified image format
+ * \param type  the user-specified image datatype
+ * \param swapBytes  typically the current pixel pack/unpack byteswap state
  * \return GL_TRUE if the formats match, GL_FALSE otherwise.
  */
 GLboolean
 _mesa_format_matches_format_and_type(gl_format gl_format,
-				     GLenum format, GLenum type)
+				     GLenum format, GLenum type,
+                                     GLboolean swapBytes)
 {
    const GLboolean littleEndian = _mesa_little_endian();
 

src/mesa/main/formats.h

@@ -343,7 +343,8 @@ _mesa_format_num_components(gl_format format);
 
 GLboolean
 _mesa_format_matches_format_and_type(gl_format gl_format,
-				     GLenum format, GLenum type);
+				     GLenum format, GLenum type,
+                                     GLboolean swapBytes);
 
 
 #ifdef __cplusplus

src/mesa/main/readpix.c

@@ -209,7 +209,8 @@ fast_read_rgba_pixels_memcpy( struct gl_context *ctx,
    GLubyte *dst, *map;
    int dstStride, stride, j, texelBytes;
 
-   if (!_mesa_format_matches_format_and_type(rb->Format, format, type))
+   if (!_mesa_format_matches_format_and_type(rb->Format, format, type,
+                                             ctx->Pack.SwapBytes))
       return GL_FALSE;
 
    /* check for things we can't handle here */

src/mesa/swrast/s_drawpix.c

@@ -239,7 +239,8 @@ fast_draw_rgba_pixels(struct gl_context *ctx, GLint x, GLint y,
       return GL_TRUE;
    }
 
-   if (_mesa_format_matches_format_and_type(rb->Format, format, type)) {
+   if (_mesa_format_matches_format_and_type(rb->Format, format, type,
+                                            ctx->Unpack.SwapBytes)) {
       fast_draw_generic_pixels(ctx, rb, x, y, width, height,
                                format, type, &unpack, pixels);
       return GL_TRUE;