Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 254 insertions, 0 deletions

diff --git a/nx-X11/extras/Mesa/src/mesa/main/texcompress.c b/nx-X11/extras/Mesa/src/mesa/main/texcompress.c
new file mode 100644
index 000000000..d18b1d0b4
--- /dev/null
+++ b/nx-X11/extras/Mesa/src/mesa/main/texcompress.c
@@ -0,0 +1,254 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.1
+ *
+ * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/**
+ * \file texcompress.c
+ * Helper functions for texture compression.
+ */
+
+
+#include "glheader.h"
+#include "imports.h"
+#include "colormac.h"
+#include "context.h"
+#include "image.h"
+#include "texcompress.h"
+#include "texformat.h"
+#include "texstore.h"
+
+/**
+ * Get the list of supported internal compression formats.
+ *
+ * \param ctx GL context.
+ * \param formats the resulting format list (may be NULL).
+ *
+ * \return number of formats.
+ */
+GLuint
+_mesa_get_compressed_formats( GLcontext *ctx, GLint *formats )
+{
+   GLuint n = 0;
+   if (ctx->Extensions.ARB_texture_compression) {
+      if (ctx->Extensions.TDFX_texture_compression_FXT1) {
+         if (formats) {
+            formats[n++] = GL_COMPRESSED_RGB_FXT1_3DFX;
+            formats[n++] = GL_COMPRESSED_RGBA_FXT1_3DFX;
+         }
+         else {
+            n += 2;
+         }
+      }
+      if (ctx->Extensions.EXT_texture_compression_s3tc) {
+         if (formats) {
+            formats[n++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
+            /* Skip this one because it has a restriction (all transparent
+             * pixels become black).  See the texture compressions spec for
+             * a detailed explanation.  This is what NVIDIA does.
+            formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
+            */
+            formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
+            formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
+         }
+         else {
+            n += 3;
+         }
+      }
+      if (ctx->Extensions.S3_s3tc) {
+         if (formats) {
+            formats[n++] = GL_RGB_S3TC;
+            formats[n++] = GL_RGB4_S3TC;
+            formats[n++] = GL_RGBA_S3TC;
+            formats[n++] = GL_RGBA4_S3TC;
+         }
+         else {
+            n += 4;
+         }
+      }
+   }
+   return n;
+}
+
+
+
+/**
+ * Return number of bytes needed to store a texture of the given size
+ * using the specified compressed format.
+ * This is called via the ctx->Driver.CompressedTextureSize function,
+ * unless a device driver overrides it.
+ *
+ * \param width texture width in texels.
+ * \param height texture height in texels.
+ * \param depth texture depth in texels.
+ * \param format - one of the specific compressed texture formats
+ *
+ * \return size in bytes, or zero if bad format
+ */
+GLuint
+_mesa_compressed_texture_size( GLcontext *ctx,
+                               GLsizei width, GLsizei height, GLsizei depth,
+                               GLenum format )
+{
+   GLuint size;
+
+   ASSERT(depth == 1);
+   (void) depth;
+
+   switch (format) {
+   case GL_COMPRESSED_RGB_FXT1_3DFX:
+   case GL_COMPRESSED_RGBA_FXT1_3DFX:
+      /* round up width to next multiple of 8, height to next multiple of 4 */
+      width = (width + 7) & ~7;
+      height = (height + 3) & ~3;
+      /* 16 bytes per 8x4 tile of RGB[A] texels */
+      size = width * height / 2;
+      /* Textures smaller than 8x4 will effectively be made into 8x4 and
+       * take 16 bytes.
+       */
+      if (size < 16)
+         size = 16;
+      return size;
+   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+   case GL_RGB_S3TC:
+   case GL_RGB4_S3TC:
+      /* round up width, height to next multiple of 4 */
+      width = (width + 3) & ~3;
+      height = (height + 3) & ~3;
+      /* 8 bytes per 4x4 tile of RGB[A] texels */
+      size = width * height / 2;
+      /* Textures smaller than 4x4 will effectively be made into 4x4 and
+       * take 8 bytes.
+       */
+      if (size < 8)
+         size = 8;
+      return size;
+   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+   case GL_RGBA_S3TC:
+   case GL_RGBA4_S3TC:
+      /* round up width, height to next multiple of 4 */
+      width = (width + 3) & ~3;
+      height = (height + 3) & ~3;
+      /* 16 bytes per 4x4 tile of RGBA texels */
+      size = width * height; /* simple! */
+      /* Textures smaller than 4x4 will effectively be made into 4x4 and
+       * take 16 bytes.
+       */
+      if (size < 16)
+         size = 16;
+      return size;
+   default:
+      _mesa_problem(ctx, "bad texformat in compressed_texture_size");
+      return 0;
+   }
+}
+
+
+/*
+ * Compute the bytes per row in a compressed texture image.
+ * We use this for computing the destination address for sub-texture updates.
+ * \param format  one of the specific texture compression formats
+ * \param width  image width in pixels
+ * \return stride, in bytes, between rows for compressed image
+ */
+GLint
+_mesa_compressed_row_stride(GLenum format, GLsizei width)
+{
+   GLint stride;
+
+   switch (format) {
+   case GL_COMPRESSED_RGB_FXT1_3DFX:
+   case GL_COMPRESSED_RGBA_FXT1_3DFX:
+      stride = ((width + 7) / 8) * 16; /* 16 bytes per 8x4 tile */
+      break;
+   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+   case GL_RGB_S3TC:
+   case GL_RGB4_S3TC:
+      stride = ((width + 3) / 4) * 8; /* 8 bytes per 4x4 tile */
+      break;
+   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+   case GL_RGBA_S3TC:
+   case GL_RGBA4_S3TC:
+      stride = ((width + 3) / 4) * 16; /* 16 bytes per 4x4 tile */
+      break;
+   default:
+      return 0;
+   }
+
+   return stride;
+}
+
+
+/*
+ * Return the address of the pixel at (col, row, img) in a
+ * compressed texture image.
+ * \param col, row, img - image position (3D)
+ * \param format - compressed image format
+ * \param width - image width
+ * \param image - the image address
+ * \return address of pixel at (row, col)
+ */
+GLubyte *
+_mesa_compressed_image_address(GLint col, GLint row, GLint img,
+                               GLenum format,
+                               GLsizei width, const GLubyte *image)
+{
+   GLubyte *addr;
+
+   (void) img;
+
+   /* We try to spot a "complete" subtexture "above" ROW, COL;
+    * this texture is given by appropriate rounding of WIDTH x ROW.
+    * Then we just add the amount left (usually on the left).
+    *
+    * Example for X*Y microtiles (Z bytes each)
+    * offset = Z * (((width + X - 1) / X) * (row / Y) + col / X);
+    */
+
+   switch (format) {
+   case GL_COMPRESSED_RGB_FXT1_3DFX:
+   case GL_COMPRESSED_RGBA_FXT1_3DFX:
+      addr = (GLubyte *) image + 16 * (((width + 7) / 8) * (row / 4) + col / 8);
+      break;
+   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+   case GL_RGB_S3TC:
+   case GL_RGB4_S3TC:
+      addr = (GLubyte *) image + 8 * (((width + 3) / 4) * (row / 4) + col / 4);
+      break;
+   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+   case GL_RGBA_S3TC:
+   case GL_RGBA4_S3TC:
+      addr = (GLubyte *) image + 16 * (((width + 3) / 4) * (row / 4) + col / 4);
+      break;
+   default:
+      return NULL;
+   }
+
+   return addr;
+}