texture compression: getting warmer

4 files changed, 57 insertions, 23 deletions

diff --git a/src/mesa/main/texcompress_fxt1.c b/src/mesa/main/texcompress_fxt1.c
index 2d25f5b6e0..e654512371 100644
--- a/src/mesa/main/texcompress_fxt1.c
+++ b/src/mesa/main/texcompress_fxt1.c
@@ -40,14 +40,14 @@
 #include "texstore.h"
 
 
-static GLint
+static GLuint
 compress_fxt1 (GLcontext *ctx,
-               GLint srcWidth,
-               GLint srcHeight,
+               GLsizei srcWidth,
+               GLsizei srcHeight,
                GLenum srcFormat,
-               const GLvoid *pixels,
+               const GLchan *source,
                GLint srcRowStride,
-               GLvoid *dst,
+               GLubyte *dest,
                GLint dstRowStride);
 
 
@@ -69,12 +69,9 @@ texstore_rgb_fxt1(STORE_PARAMS)
    const GLchan *pixels;
    GLint srcRowStride;
    GLubyte *dst;
-   GLint texWidth;
+   const GLint texWidth = dstRowStride * 8 / 16; /* a bit of a hack */
    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);
@@ -130,13 +127,10 @@ texstore_rgba_fxt1(STORE_PARAMS)
    const GLchan *pixels;
    GLint srcRowStride;
    GLubyte *dst;
-   GLint texWidth;
+   GLint texWidth = dstRowStride * 8 / 16; /* a bit of a hack */
    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(dstFormat == &_mesa_texformat_rgba_fxt1);
    ASSERT(dstXoffset % 8 == 0);
    ASSERT(dstYoffset % 4 == 0);
    ASSERT(dstZoffset     == 0);
@@ -269,14 +263,14 @@ const struct gl_texture_format _mesa_texformat_rgba_fxt1 = {
 };
 
 
-static GLint
+static GLuint
 compress_fxt1 (GLcontext *ctx,
-               GLint srcWidth,
-               GLint srcHeight,
+               GLsizei srcWidth,
+               GLsizei srcHeight,
                GLenum srcFormat,
-               const GLvoid *pixels,
+               const GLchan *source,
                GLint srcRowStride,
-               GLvoid *dst,
+               GLubyte *dest,
                GLint dstRowStride)
 {
    /* here be dragons */
diff --git a/src/mesa/main/texcompress_s3tc.c b/src/mesa/main/texcompress_s3tc.c
index 35f358a8f3..07ca6b0f01 100644
--- a/src/mesa/main/texcompress_s3tc.c
+++ b/src/mesa/main/texcompress_s3tc.c
@@ -57,7 +57,7 @@ texstore_rgb_dxt1(STORE_PARAMS)
    const GLchan *pixels;
    GLint srcRowStride;
    GLubyte *dst;
-   const GLint texWidth = dstRowStride / 2; /* a bit of a hack */
+   const GLint texWidth = dstRowStride * 4 / 8; /* a bit of a hack */
    const GLchan *tempImage = NULL;
 
    ASSERT(dstFormat == &_mesa_texformat_rgb_dxt1);
@@ -114,7 +114,7 @@ texstore_rgba_dxt1(STORE_PARAMS)
    const GLchan *pixels;
    GLint srcRowStride;
    GLubyte *dst;
-   const GLint texWidth = dstRowStride / 2; /* a bit of a hack */
+   const GLint texWidth = dstRowStride * 4 / 8; /* a bit of a hack */
    const GLchan *tempImage = NULL;
 
    ASSERT(dstFormat == &_mesa_texformat_rgba_dxt1);
@@ -169,7 +169,7 @@ texstore_rgba_dxt3(STORE_PARAMS)
    const GLchan *pixels;
    GLint srcRowStride;
    GLubyte *dst;
-   const GLint texWidth = dstRowStride / 4; /* a bit of a hack */
+   const GLint texWidth = dstRowStride * 4 / 16; /* a bit of a hack */
    const GLchan *tempImage = NULL;
 
    ASSERT(dstFormat == &_mesa_texformat_rgba_dxt3);
@@ -223,7 +223,7 @@ texstore_rgba_dxt5(STORE_PARAMS)
    const GLchan *pixels;
    GLint srcRowStride;
    GLubyte *dst;
-   const GLint texWidth = dstRowStride / 4; /* a bit of a hack */
+   const GLint texWidth = dstRowStride * 4 / 16; /* a bit of a hack */
    const GLchan *tempImage = NULL;
 
    ASSERT(dstFormat == &_mesa_texformat_rgba_dxt5);
diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index 3dae1929c4..ea7d7cebb1 100644
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -3280,3 +3280,37 @@ do {									\
       _mesa_problem(NULL,"unexpected bytes/pixel in _mesa_rescale_teximage2d");
    }
 }
+
+
+/**
+ * Upscale an image by replication, not (typical) stretching.
+ * We use this when the image width or height is less than a
+ * certain size (4, 8) and we need to upscale an image.
+ */
+void
+_mesa_upscale_teximage2d (GLsizei inWidth, GLsizei inHeight,
+                          GLsizei outWidth, GLsizei outHeight,
+                          GLint comps, const GLchan *src, GLint srcRowStride,
+                          GLchan *dest )
+{
+   GLint i, j, k;
+
+   ASSERT(outWidth >= inWidth);
+   ASSERT(outHeight >= inHeight);
+   ASSERT(inWidth == 1 || inWidth == 2 || inHeight == 1 || inHeight == 2);
+#if 0
+   ASSERT((outWidth & 3) == 0);
+   ASSERT((outHeight & 3) == 0);
+#endif
+
+   for (i = 0; i < outHeight; i++) {
+      const GLint ii = i % inHeight;
+      for (j = 0; j < outWidth; j++) {
+         const GLint jj = j % inWidth;
+         for (k = 0; k < comps; k++) {
+            dest[(i * outWidth + j) * comps + k]
+               = src[ii * srcRowStride + jj * comps + k];
+         }
+      }
+   }
+}
diff --git a/src/mesa/main/texstore.h b/src/mesa/main/texstore.h
index d276ff94e4..4edad034d0 100644
--- a/src/mesa/main/texstore.h
+++ b/src/mesa/main/texstore.h
@@ -232,4 +232,10 @@ _mesa_rescale_teximage2d(GLuint bytesPerPixel, GLuint dstRowStride,
                          GLint dstWidth, GLint dstHeight,
                          const GLvoid *srcImage, GLvoid *dstImage);
 
+extern void
+_mesa_upscale_teximage2d( GLsizei inWidth, GLsizei inHeight,
+                          GLsizei outWidth, GLsizei outHeight,
+                          GLint comps, const GLchan *src, GLint srcRowStride,
+                          GLchan *dest );
+
 #endif