FXT1 preparations

1 files changed, 133 insertions, 6 deletions

diff --git a/src/mesa/main/texcompress_fxt1.c b/src/mesa/main/texcompress_fxt1.c
index f18f717fc6..98e9158074 100644
--- a/src/mesa/main/texcompress_fxt1.c
+++ b/src/mesa/main/texcompress_fxt1.c
@@ -40,28 +40,142 @@
 #include "texstore.h"
 
 
+GLint compress_fxt1 (GLcontext *ctx,
+                     GLint srcWidth,
+                     GLint srcHeight,
+                     GLenum srcFormat,
+                     const GLvoid *pixels,
+                     GLint srcRowStride,
+                     GLvoid *dst,
+                     GLint dstRowStride);
+
+
+/**
+ * Called during context initialization.
+ */
 void
 _mesa_init_texture_fxt1( GLcontext *ctx )
 {
-   /* called during context initialization */
 }
 
 
+/**
+ * Called via TexFormat->StoreImage to store an RGB_FXT1 texture.
+ */
 static GLboolean
 texstore_rgb_fxt1(STORE_PARAMS)
 {
-   /* XXX to do */
-   return GL_FALSE;
+   const GLchan *pixels;
+   GLint srcRowStride;
+   GLubyte *dst;
+   GLint texWidth;
+   const GLchan *tempImage = NULL;
+
+   dstRowStride = _mesa_compressed_row_stride(GL_COMPRESSED_RGB_FXT1_3DFX, srcWidth);
+   texWidth = dstRowStride * 8 / 16; /* a bit of a hack */
+
+   ASSERT(dstFormat == &_mesa_texformat_rgb_fxt1);
+   ASSERT(dstXoffset % 8 == 0);
+   ASSERT(dstYoffset % 4 == 0);
+   ASSERT(dstZoffset     == 0);
+
+   /* [dBorca]
+    * we still need to pass a 4byte/pixel texture to the codec
+    */
+   if (srcFormat != GL_RGB ||
+       srcType != CHAN_TYPE ||
+       ctx->_ImageTransferState ||
+       srcPacking->SwapBytes) {
+      /* convert image to RGB/GLchan */
+      tempImage = _mesa_make_temp_chan_image(ctx, dims,
+                                             baseInternalFormat,
+                                             /*dstFormat->BaseFormat*/GL_RGBA,
+                                             srcWidth, srcHeight, srcDepth,
+                                             srcFormat, srcType, srcAddr,
+                                             srcPacking);
+      if (!tempImage)
+         return GL_FALSE; /* out of memory */
+      _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
+      pixels = tempImage;
+      srcRowStride = /*3*/4 * srcWidth;
+      srcFormat = GL_RGB;
+   }
+   else {
+      pixels = (const GLchan *) srcAddr;
+      srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
+                                            srcType) / sizeof(GLchan);
+   }
+
+   dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
+                                        GL_COMPRESSED_RGB_FXT1_3DFX,
+                                        texWidth, dstAddr);
+
+   compress_fxt1(ctx, srcWidth, srcHeight, srcFormat, pixels, srcRowStride,
+                 dst, dstRowStride);
+
+   if (tempImage)
+      _mesa_free((void *) tempImage);
+
+   return GL_TRUE;
 }
 
 
+/**
+ * Called via TexFormat->StoreImage to store an RGBA_FXT1 texture.
+ */
 static GLboolean
 texstore_rgba_fxt1(STORE_PARAMS)
 {
-   /* XXX to do */
-   return GL_FALSE;
-}
+   const GLchan *pixels;
+   GLint srcRowStride;
+   GLubyte *dst;
+   GLint texWidth;
+   const GLchan *tempImage = NULL;
+
+   dstRowStride = _mesa_compressed_row_stride(GL_COMPRESSED_RGBA_FXT1_3DFX, srcWidth);
+   texWidth = dstRowStride * 8 / 16; /* a bit of a hack */
+
+   ASSERT(dstFormat == &_mesa_texformat_rgba_dxt1);
+   ASSERT(dstXoffset % 8 == 0);
+   ASSERT(dstYoffset % 4 == 0);
+   ASSERT(dstZoffset     == 0);
+
+   if (srcFormat != GL_RGBA ||
+       srcType != CHAN_TYPE ||
+       ctx->_ImageTransferState ||
+       srcPacking->SwapBytes) {
+      /* convert image to RGBA/GLchan */
+      tempImage = _mesa_make_temp_chan_image(ctx, dims,
+                                             baseInternalFormat,
+                                             dstFormat->BaseFormat,
+                                             srcWidth, srcHeight, srcDepth,
+                                             srcFormat, srcType, srcAddr,
+                                             srcPacking);
+      if (!tempImage)
+         return GL_FALSE; /* out of memory */
+      _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
+      pixels = tempImage;
+      srcRowStride = 4 * srcWidth;
+      srcFormat = GL_RGBA;
+   }
+   else {
+      pixels = (const GLchan *) srcAddr;
+      srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
+                                            srcType) / sizeof(GLchan);
+   }
 
+   dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
+                                        GL_COMPRESSED_RGBA_FXT1_3DFX,
+                                        texWidth, dstAddr);
+
+   compress_fxt1(ctx, srcWidth, srcHeight, srcFormat, pixels, srcRowStride,
+                 dst, dstRowStride);
+
+   if (tempImage)
+      _mesa_free((void*) tempImage);
+
+   return GL_TRUE;
+}
 
 
 static void
@@ -153,3 +267,16 @@ const struct gl_texture_format _mesa_texformat_rgba_fxt1 = {
    NULL, /*impossible*/ 		/* FetchTexel3Df */
 };
 
+
+GLint compress_fxt1 (GLcontext *ctx,
+                     GLint srcWidth,
+                     GLint srcHeight,
+                     GLenum srcFormat,
+                     const GLvoid *pixels,
+                     GLint srcRowStride,
+                     GLvoid *dst,
+                     GLint dstRowStride)
+{
+   /* here be dragons */
+   return -1;
+}