Work in glGetTexImage() to return GL_COLOR_INDEX images.

Prototype code for GL_SGIX_depth_texture / more flexible teximage code.

5 files changed, 302 insertions, 38 deletions

diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index 5715bff75a..7c6dc8b72a 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -1,10 +1,10 @@
-/* $Id: extensions.c,v 1.45 2001/01/24 04:56:20 brianp Exp $ */
+/* $Id: extensions.c,v 1.46 2001/02/17 00:15:39 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
  * Version:  3.5
  *
- * Copyright (C) 1999-2000  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2001  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"),
@@ -84,7 +84,7 @@ static struct {
    { ON,  "GL_EXT_shared_texture_palette",    F(EXT_shared_texture_palette) },
    { ON,  "GL_EXT_stencil_wrap",              F(EXT_stencil_wrap) },
    { ON,  "GL_EXT_texture3D",                 F(EXT_texture3D) },
-   { OFF, "GL_EXT_texture_compression_s3tc",  F(EXT_texture_compression_s3tc) },
+   { OFF, "GL_EXT_texture_compression_s3tc",  F(EXT_texture_compression_s3tc)},
    { ON,  "GL_EXT_texture_env_add",           F(EXT_texture_env_add) },
    { OFF, "GL_EXT_texture_env_combine",       F(EXT_texture_env_combine) },
    { OFF, "GL_EXT_texture_env_dot3",          F(EXT_texture_env_dot3) },
@@ -103,6 +103,7 @@ static struct {
    { ON,  "GL_SGI_color_table",               F(SGI_color_table) },
    { ON,  "GL_SGIS_pixel_texture",            F(SGIS_pixel_texture) },
    { ON,  "GL_SGIS_texture_edge_clamp",       F(SGIS_texture_edge_clamp) },
+   { OFF, "GL_SGIX_depth_texture",            F(SGIX_depth_texture) },
    { ON,  "GL_SGIX_pixel_texture",            F(SGIX_pixel_texture) },
    { OFF, "GL_3DFX_texture_compression_FXT1", F(_3DFX_texture_compression_FXT1) }
 };
@@ -124,6 +125,7 @@ _mesa_enable_sw_extensions(GLcontext *ctx)
    gl_extensions_enable(ctx, "GL_HP_occlusion_test");
    gl_extensions_enable(ctx, "GL_NV_blend_square");
    gl_extensions_enable(ctx, "GL_MESA_sprite_point");
+   gl_extensions_enable(ctx, "GL_SGIX_depth_texture");
 }
 
 
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 2e0c1d149d..59cd836c8a 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1,4 +1,4 @@
-/* $Id: mtypes.h,v 1.18 2001/02/06 21:42:48 brianp Exp $ */
+/* $Id: mtypes.h,v 1.19 2001/02/17 00:15:39 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -788,6 +788,7 @@ struct gl_texture_image {
    GLubyte IntensityBits;	/*   color resolution.                   */
    GLubyte LuminanceBits;
    GLubyte IndexBits;
+   GLubyte DepthBits;
    GLuint Border;		/* 0 or 1 */
    GLuint Width;		/* = 2^WidthLog2 + 2*Border */
    GLuint Height;		/* = 2^HeightLog2 + 2*Border */
@@ -1221,6 +1222,7 @@ struct gl_extensions {
    GLboolean SGI_color_table;
    GLboolean SGIS_pixel_texture;
    GLboolean SGIS_texture_edge_clamp;
+   GLboolean SGIX_depth_texture;
    GLboolean SGIX_pixel_texture;
    GLboolean _3DFX_texture_compression_FXT1;
 };
diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index 22973c35f8..fe5fb44981 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -1,4 +1,4 @@
-/* $Id: teximage.c,v 1.75 2001/02/07 18:59:45 brianp Exp $ */
+/* $Id: teximage.c,v 1.76 2001/02/17 00:15:39 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -210,12 +210,94 @@ _mesa_base_tex_format( GLcontext *ctx, GLint format )
       case GL_COLOR_INDEX12_EXT:
       case GL_COLOR_INDEX16_EXT:
          return GL_COLOR_INDEX;
+      case GL_DEPTH_COMPONENT:
+      case GL_DEPTH_COMPONENT16_SGIX:
+      case GL_DEPTH_COMPONENT24_SGIX:
+      case GL_DEPTH_COMPONENT32_SGIX:
+         if (ctx->Extensions.SGIX_depth_texture)
+            return GL_DEPTH_COMPONENT;
+         else
+            return -1;
       default:
          return -1;  /* error */
    }
 }
 
 
+/*
+ * Test if the given image format is a color/rgba format.  That is,
+ * not color index, depth, stencil, etc.
+ */
+static GLboolean
+is_color_format(GLenum format)
+{
+   switch (format) {
+      case GL_ALPHA:
+      case GL_ALPHA4:
+      case GL_ALPHA8:
+      case GL_ALPHA12:
+      case GL_ALPHA16:
+      case 1:
+      case GL_LUMINANCE:
+      case GL_LUMINANCE4:
+      case GL_LUMINANCE8:
+      case GL_LUMINANCE12:
+      case GL_LUMINANCE16:
+      case 2:
+      case GL_LUMINANCE_ALPHA:
+      case GL_LUMINANCE4_ALPHA4:
+      case GL_LUMINANCE6_ALPHA2:
+      case GL_LUMINANCE8_ALPHA8:
+      case GL_LUMINANCE12_ALPHA4:
+      case GL_LUMINANCE12_ALPHA12:
+      case GL_LUMINANCE16_ALPHA16:
+      case GL_INTENSITY:
+      case GL_INTENSITY4:
+      case GL_INTENSITY8:
+      case GL_INTENSITY12:
+      case GL_INTENSITY16:
+      case 3:
+      case GL_RGB:
+      case GL_R3_G3_B2:
+      case GL_RGB4:
+      case GL_RGB5:
+      case GL_RGB8:
+      case GL_RGB10:
+      case GL_RGB12:
+      case GL_RGB16:
+      case 4:
+      case GL_RGBA:
+      case GL_RGBA2:
+      case GL_RGBA4:
+      case GL_RGB5_A1:
+      case GL_RGBA8:
+      case GL_RGB10_A2:
+      case GL_RGBA12:
+      case GL_RGBA16:
+         return GL_TRUE;
+      default:
+         return GL_FALSE;
+   }
+}
+
+
+static GLboolean
+is_index_format(GLenum format)
+{
+   switch (format) {
+      case GL_COLOR_INDEX:
+      case GL_COLOR_INDEX1_EXT:
+      case GL_COLOR_INDEX2_EXT:
+      case GL_COLOR_INDEX4_EXT:
+      case GL_COLOR_INDEX8_EXT:
+      case GL_COLOR_INDEX12_EXT:
+      case GL_COLOR_INDEX16_EXT:
+         return GL_TRUE;
+      default:
+         return GL_FALSE;
+   }
+}
+
 
 /*
  * Return GL_TRUE if internalFormat is a compressed format, return GL_FALSE
@@ -476,6 +558,7 @@ clear_teximage_fields(struct gl_texture_image *img)
 {
    ASSERT(img);
    img->Format = 0;
+   img->Type = 0;
    img->IntFormat = 0;
    img->RedBits = 0;
    img->GreenBits = 0;
@@ -1028,11 +1111,22 @@ _mesa_GetTexImage( GLenum target, GLint level, GLenum format,
       return;
    }
 
-   if (_mesa_components_in_format(format) <= 0) {
+   if (_mesa_components_in_format(format) <= 0 ||
+       format == GL_STENCIL_INDEX) {
       gl_error( ctx, GL_INVALID_ENUM, "glGetTexImage(format)" );
       return;
    }
 
+   if (!ctx->Extensions.EXT_paletted_texture && is_index_format(format)) {
+      gl_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
+   }
+
+   if (!ctx->Extensions.SGIX_depth_texture && format == GL_DEPTH_COMPONENT) {
+      gl_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
+   }
+
+   /* XXX what if format/type doesn't match texture format/type? */
+
    if (!pixels)
       return;
 
@@ -1057,7 +1151,8 @@ _mesa_GetTexImage( GLenum target, GLint level, GLenum format,
    if (ctx->NewState & _NEW_PIXEL)
       gl_update_state(ctx);
 
-   if (ctx->_ImageTransferState & IMAGE_CONVOLUTION_BIT) {
+   if (is_color_format(format) &&
+       ctx->_ImageTransferState & IMAGE_CONVOLUTION_BIT) {
       /* convert texture image to GL_RGBA, GL_FLOAT */
       GLint width = texImage->Width;
       GLint height = texImage->Height;
@@ -1132,7 +1227,7 @@ _mesa_GetTexImage( GLenum target, GLint level, GLenum format,
       FREE(convImage);
    }
    else {
-      /* no convolution */
+      /* no convolution, or non-rgba image */
       GLint width = texImage->Width;
       GLint height = texImage->Height;
       GLint depth = texImage->Depth;
@@ -1141,10 +1236,41 @@ _mesa_GetTexImage( GLenum target, GLint level, GLenum format,
          for (row = 0; row < height; row++) {
             /* compute destination address in client memory */
             GLvoid *dest = _mesa_image_address( &ctx->Unpack, pixels,
-                                    width, height, format, type, img, row, 0);
+                                                width, height, format, type,
+                                                img, row, 0);
             assert(dest);
 
-            {
+            if (format == GL_COLOR_INDEX) {
+               GLuint indexRow[MAX_WIDTH];
+               GLint col;
+               for (col = 0; col < width; col++) {
+                  GLchan rgba[1];
+                  /* XXX this won't really work yet */
+                  /*need (*texImage->FetchRawTexel)() */
+                  (*texImage->FetchTexel)(ctx, texObj, texImage,
+                                           col, row, img, rgba);
+                  indexRow[col] = rgba[0];
+               }
+               _mesa_pack_index_span(ctx, width, type, dest,
+                                     indexRow, &ctx->Pack,
+                                     ctx->_ImageTransferState);
+            }
+            else if (format == GL_DEPTH_COMPONENT) {
+               /* XXX finish this */
+               GLfloat depthRow[MAX_WIDTH];
+               GLint col;
+               for (col = 0; col < width; col++) {
+                  GLchan rgba[1];
+                  /* XXX this won't really work yet */
+                  /*need (*texImage->FetchRawTexel)() */
+                  (*texImage->FetchTexel)(ctx, texObj, texImage,
+                                           col, row, img, rgba);
+                  depthRow[col] = (GLfloat) rgba[0];
+               }
+               _mesa_pack_depth_span(ctx, width, dest, type,
+                                     depthRow, &ctx->Pack);
+            }
+            else {
                /* general case:  convert row to RGBA format */
                GLchan rgba[MAX_WIDTH][4];
                GLint col;
@@ -1152,7 +1278,6 @@ _mesa_GetTexImage( GLenum target, GLint level, GLenum format,
                   (*texImage->FetchTexel)(ctx, texObj, texImage,
                                           col, row, img, rgba[col]);
                }
-
                _mesa_pack_rgba_span( ctx, width, (const GLchan (*)[4])rgba,
                                      format, type, dest, &ctx->Pack,
                                      ctx->_ImageTransferState );
@@ -1176,7 +1301,9 @@ _mesa_TexImage1D( GLenum target, GLint level, GLint internalFormat,
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 
-   _mesa_adjust_image_for_convolution(ctx, 1, &postConvWidth, NULL);
+   if (is_color_format(internalFormat)) {
+      _mesa_adjust_image_for_convolution(ctx, 1, &postConvWidth, NULL);
+   }
 
    if (target == GL_TEXTURE_1D) {
       struct gl_texture_unit *texUnit;
@@ -1231,7 +1358,8 @@ _mesa_TexImage1D( GLenum target, GLint level, GLint internalFormat,
 
       /* one of these has to be non-zero! */
       ASSERT(texImage->RedBits || texImage->IndexBits || texImage->AlphaBits ||
-             texImage->LuminanceBits || texImage->IntensityBits);
+             texImage->LuminanceBits || texImage->IntensityBits ||
+             texImage->DepthBits);
       ASSERT(texImage->FetchTexel);
 
       /* state update */
@@ -1279,7 +1407,10 @@ _mesa_TexImage2D( GLenum target, GLint level, GLint internalFormat,
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 
-   _mesa_adjust_image_for_convolution(ctx, 2, &postConvWidth,&postConvHeight);
+   if (is_color_format(internalFormat)) {
+      _mesa_adjust_image_for_convolution(ctx, 2, &postConvWidth,
+                                         &postConvHeight);
+   }
 
    if (target == GL_TEXTURE_2D ||
        (ctx->Extensions.ARB_texture_cube_map &&
@@ -1339,7 +1470,8 @@ _mesa_TexImage2D( GLenum target, GLint level, GLint internalFormat,
 
       /* one of these has to be non-zero! */
       ASSERT(texImage->RedBits || texImage->IndexBits || texImage->AlphaBits ||
-             texImage->LuminanceBits || texImage->IntensityBits);
+             texImage->LuminanceBits || texImage->IntensityBits ||
+             texImage->DepthBits);
       ASSERT(texImage->FetchTexel);
 
       /* state update */
@@ -1443,7 +1575,8 @@ _mesa_TexImage3D( GLenum target, GLint level, GLint internalFormat,
 
       /* one of these has to be non-zero! */
       ASSERT(texImage->RedBits || texImage->IndexBits || texImage->AlphaBits ||
-             texImage->LuminanceBits || texImage->IntensityBits);
+             texImage->LuminanceBits || texImage->IntensityBits ||
+             texImage->DepthBits);
       ASSERT(texImage->FetchTexel);
 
       /* state update */
@@ -1504,7 +1637,10 @@ _mesa_TexSubImage1D( GLenum target, GLint level,
    struct gl_texture_object *texObj;
    struct gl_texture_image *texImage;
 
-   _mesa_adjust_image_for_convolution(ctx, 1, &postConvWidth, NULL);
+   /* XXX should test internal format */
+   if (is_color_format(format)) {
+      _mesa_adjust_image_for_convolution(ctx, 1, &postConvWidth, NULL);
+   }
 
    if (subtexture_error_check(ctx, 1, target, level, xoffset, 0, 0,
                               postConvWidth, 1, 1, format, type)) {
@@ -1542,7 +1678,11 @@ _mesa_TexSubImage2D( GLenum target, GLint level,
    struct gl_texture_object *texObj;
    struct gl_texture_image *texImage;
 
-   _mesa_adjust_image_for_convolution(ctx, 2, &postConvWidth,&postConvHeight);
+   /* XXX should test internal format */
+   if (is_color_format(format)) {
+      _mesa_adjust_image_for_convolution(ctx, 2, &postConvWidth,
+                                         &postConvHeight);
+   }
 
    if (subtexture_error_check(ctx, 2, target, level, xoffset, yoffset, 0,
                              postConvWidth, postConvHeight, 1, format, type)) {
@@ -1663,7 +1803,9 @@ _mesa_CopyTexImage1D( GLenum target, GLint level,
    if (ctx->NewState & _NEW_PIXEL)
       gl_update_state(ctx);
 
-   _mesa_adjust_image_for_convolution(ctx, 1, &postConvWidth, NULL);
+   if (is_color_format(internalFormat)) {
+      _mesa_adjust_image_for_convolution(ctx, 1, &postConvWidth, NULL);
+   }
 
    if (copytexture_error_check(ctx, 1, target, level, internalFormat,
                                postConvWidth, 1, border))
@@ -1706,7 +1848,10 @@ _mesa_CopyTexImage2D( GLenum target, GLint level, GLenum internalFormat,
    if (ctx->NewState & _NEW_PIXEL)
       gl_update_state(ctx);
 
-   _mesa_adjust_image_for_convolution(ctx, 2, &postConvWidth,&postConvHeight);
+   if (is_color_format(internalFormat)) {
+      _mesa_adjust_image_for_convolution(ctx, 2, &postConvWidth,
+                                         &postConvHeight);
+   }
 
    if (copytexture_error_check(ctx, 2, target, level, internalFormat,
                                postConvWidth, postConvHeight, border))
@@ -1748,6 +1893,7 @@ _mesa_CopyTexSubImage1D( GLenum target, GLint level,
    if (ctx->NewState & _NEW_PIXEL)
       gl_update_state(ctx);
 
+   /* XXX should test internal format */
    _mesa_adjust_image_for_convolution(ctx, 1, &postConvWidth, NULL);
 
    if (copytexsubimage_error_check(ctx, 1, target, level,
@@ -1798,7 +1944,8 @@ _mesa_CopyTexSubImage2D( GLenum target, GLint level,
    if (ctx->NewState & _NEW_PIXEL)
       gl_update_state(ctx);
 
-   _mesa_adjust_image_for_convolution(ctx, 2, &postConvWidth,&postConvHeight);
+   /* XXX should test internal format */
+   _mesa_adjust_image_for_convolution(ctx, 2, &postConvWidth, &postConvHeight);
 
    if (copytexsubimage_error_check(ctx, 2, target, level, xoffset, yoffset, 0,
                                    postConvWidth, postConvHeight))
@@ -1848,7 +1995,8 @@ _mesa_CopyTexSubImage3D( GLenum target, GLint level,
    if (ctx->NewState & _NEW_PIXEL)
       gl_update_state(ctx);
 
-   _mesa_adjust_image_for_convolution(ctx, 2, &postConvWidth,&postConvHeight);
+   /* XXX should test internal format */
+   _mesa_adjust_image_for_convolution(ctx, 2, &postConvWidth, &postConvHeight);
 
    if (copytexsubimage_error_check(ctx, 3, target, level, xoffset, yoffset,
                                    zoffset, postConvWidth, postConvHeight))
diff --git a/src/mesa/main/texstate.c b/src/mesa/main/texstate.c
index 33b7da0604..ecfd5c59b3 100644
--- a/src/mesa/main/texstate.c
+++ b/src/mesa/main/texstate.c
@@ -1,10 +1,10 @@
-/* $Id: texstate.c,v 1.30 2001/02/06 21:42:48 brianp Exp $ */
+/* $Id: texstate.c,v 1.31 2001/02/17 00:15:39 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
  * Version:  3.5
  *
- * Copyright (C) 1999-2000  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2001  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"),
@@ -921,6 +921,15 @@ _mesa_GetTexLevelParameteriv( GLenum target, GLint level,
       case GL_TEXTURE_INDEX_SIZE_EXT:
          *params = img->IndexBits;
          return;
+      case GL_DEPTH_BITS:
+         /* XXX this isn't in the GL_SGIX_depth_texture spec
+          * but seems appropriate.
+          */
+         if (ctx->Extensions.SGIX_depth_texture)
+            *params = img->DepthBits;
+         else
+            gl_error(ctx, GL_INVALID_ENUM, "glGetTexLevelParameter[if]v(pname)");
+         return;
 
       /* GL_ARB_texture_compression */
       case GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB:
diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index 9b38d7e813..224f79dd78 100644
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -1,4 +1,4 @@
-/* $Id: texstore.c,v 1.4 2001/02/07 19:02:23 brianp Exp $ */
+/* $Id: texstore.c,v 1.5 2001/02/17 00:15:39 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -150,6 +150,13 @@ fetch_1d_texel(GLcontext *ctx,
          rgba[BCOMP] = texel[2];
          rgba[ACOMP] = texel[3];
          return;
+      case GL_DEPTH_COMPONENT:
+         {
+            const GLfloat *data = (const GLfloat *) img->Data;
+            GLfloat *texel = (GLfloat *) rgba;
+            *texel = data[i];
+            return;
+         }
       default:
          gl_problem(NULL, "Bad format in fetch_1d_texel");
          return;
@@ -210,6 +217,13 @@ fetch_2d_texel(GLcontext *ctx,
          rgba[BCOMP] = texel[2];
          rgba[ACOMP] = texel[3];
          return;
+      case GL_DEPTH_COMPONENT:
+         {
+            const GLfloat *data = (const GLfloat *) img->Data;
+            GLfloat *texel = (GLfloat *) rgba;
+            *texel = data[width * j + i];
+            return;
+         }
       default:
          gl_problem(NULL, "Bad format in fetch_2d_texel");
    }
@@ -273,6 +287,13 @@ fetch_3d_texel(GLcontext *ctx,
          rgba[BCOMP] = texel[2];
          rgba[ACOMP] = texel[3];
          return;
+      case GL_DEPTH_COMPONENT:
+         {
+            const GLfloat *data = (const GLfloat *) img->Data;
+            GLfloat *texel = (GLfloat *) rgba;
+            *texel = data[rectarea * k + width * j + i];
+            return;
+         }
       default:
          gl_problem(NULL, "Bad format in fetch_3d_texel");
    }
@@ -298,6 +319,7 @@ set_teximage_component_sizes( struct gl_texture_image *texImage )
          texImage->IntensityBits = 0;
          texImage->LuminanceBits = 0;
          texImage->IndexBits = 0;
+         texImage->DepthBits = 0;
          break;
       case GL_LUMINANCE:
          texImage->RedBits = 0;
@@ -307,6 +329,7 @@ set_teximage_component_sizes( struct gl_texture_image *texImage )
          texImage->IntensityBits = 0;
          texImage->LuminanceBits = 8 * sizeof(GLchan);
          texImage->IndexBits = 0;
+         texImage->DepthBits = 0;
          break;
       case GL_LUMINANCE_ALPHA:
          texImage->RedBits = 0;
@@ -316,6 +339,7 @@ set_teximage_component_sizes( struct gl_texture_image *texImage )
          texImage->IntensityBits = 0;
          texImage->LuminanceBits = 8 * sizeof(GLchan);
          texImage->IndexBits = 0;
+         texImage->DepthBits = 0;
          break;
       case GL_INTENSITY:
          texImage->RedBits = 0;
@@ -325,6 +349,7 @@ set_teximage_component_sizes( struct gl_texture_image *texImage )
          texImage->IntensityBits = 8 * sizeof(GLchan);
          texImage->LuminanceBits = 0;
          texImage->IndexBits = 0;
+         texImage->DepthBits = 0;
          break;
       case GL_RED:
          texImage->RedBits = 8 * sizeof(GLchan);
@@ -334,6 +359,7 @@ set_teximage_component_sizes( struct gl_texture_image *texImage )
          texImage->IntensityBits = 0;
          texImage->LuminanceBits = 0;
          texImage->IndexBits = 0;
+         texImage->DepthBits = 0;
          break;
       case GL_GREEN:
          texImage->RedBits = 0;
@@ -343,6 +369,7 @@ set_teximage_component_sizes( struct gl_texture_image *texImage )
          texImage->IntensityBits = 0;
          texImage->LuminanceBits = 0;
          texImage->IndexBits = 0;
+         texImage->DepthBits = 0;
          break;
       case GL_BLUE:
          texImage->RedBits = 0;
@@ -352,6 +379,7 @@ set_teximage_component_sizes( struct gl_texture_image *texImage )
          texImage->IntensityBits = 0;
          texImage->LuminanceBits = 0;
          texImage->IndexBits = 0;
+         texImage->DepthBits = 0;
          break;
       case GL_RGB:
       case GL_BGR:
@@ -362,6 +390,7 @@ set_teximage_component_sizes( struct gl_texture_image *texImage )
          texImage->IntensityBits = 0;
          texImage->LuminanceBits = 0;
          texImage->IndexBits = 0;
+         texImage->DepthBits = 0;
          break;
       case GL_RGBA:
       case GL_BGRA:
@@ -373,6 +402,7 @@ set_teximage_component_sizes( struct gl_texture_image *texImage )
          texImage->IntensityBits = 0;
          texImage->LuminanceBits = 0;
          texImage->IndexBits = 0;
+         texImage->DepthBits = 0;
          break;
       case GL_COLOR_INDEX:
          texImage->RedBits = 0;
@@ -382,6 +412,17 @@ set_teximage_component_sizes( struct gl_texture_image *texImage )
          texImage->IntensityBits = 0;
          texImage->LuminanceBits = 0;
          texImage->IndexBits = 8 * sizeof(GLchan);
+         texImage->DepthBits = 0;
+         break;
+      case GL_DEPTH_COMPONENT:
+         texImage->RedBits = 0;
+         texImage->GreenBits = 0;
+         texImage->BlueBits = 0;
+         texImage->AlphaBits = 0;
+         texImage->IntensityBits = 0;
+         texImage->LuminanceBits = 0;
+         texImage->IndexBits = 0;
+         texImage->DepthBits = 8 * sizeof(GLfloat);
          break;
       default:
          gl_problem(NULL, "unexpected format in set_teximage_component_sizes");
@@ -456,6 +497,11 @@ components_in_intformat( GLint format )
       case GL_COLOR_INDEX12_EXT:
       case GL_COLOR_INDEX16_EXT:
          return 1;
+      case GL_DEPTH_COMPONENT:
+      case GL_DEPTH_COMPONENT16_SGIX:
+      case GL_DEPTH_COMPONENT24_SGIX:
+      case GL_DEPTH_COMPONENT32_SGIX:
+         return 1;
       default:
          return -1;  /* error */
    }
@@ -516,8 +562,7 @@ _mesa_transfer_teximage(GLcontext *ctx, GLuint dimensions,
    texComponents = components_in_intformat(texFormat);
 
    /* try common 2D texture cases first */
-   if (!ctx->_ImageTransferState && dimensions == 2
-       && srcType == CHAN_TYPE) {
+   if (!ctx->_ImageTransferState && dimensions == 2 && srcType == CHAN_TYPE) {
 
       if (srcFormat == texFormat) {
          /* This will cover the common GL_RGB, GL_RGBA, GL_ALPHA,
@@ -593,6 +638,31 @@ _mesa_transfer_teximage(GLcontext *ctx, GLuint dimensions,
          dest += dstImageStride;
       }
    }
+   else if (texFormat == GL_DEPTH_COMPONENT) {
+      /* Depth texture (shadow maps) */
+      const GLenum texType = GL_FLOAT;
+      GLint img, row;
+      GLfloat *dest = (GLfloat *) texAddr + dstZoffset * dstImageStride
+                    + dstYoffset * dstRowStride
+                    + dstXoffset * texComponents;
+      for (img = 0; img < srcDepth; img++) {
+         GLfloat *destRow = dest;
+         for (row = 0; row < srcHeight; row++) {
+            const GLvoid *src = _mesa_image_address(srcPacking,
+                srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, row, 0);
+            (void) src;
+            (void) texType;
+            /* XXX destRow: GLfloat vs. GLdepth? */
+            /*
+            _mesa_unpack_depth_span(ctx, srcWidth, texType, destRow,
+                                    srcType, src, srcPacking,
+                                    ctx->_ImageTransferState);
+            */
+            destRow += dstRowStride;
+         }
+         dest += dstImageStride;
+      }
+   }
    else {
       /* regular, color texture */
       if ((dimensions == 1 && ctx->Pixel.Convolution1DEnabled) ||
@@ -713,6 +783,7 @@ _mesa_store_teximage1d(GLcontext *ctx, GLenum target, GLint level,
                        struct gl_texture_image *texImage)
 {
    const GLint components = components_in_intformat(internalFormat);
+   GLint compSize;
    GLint postConvWidth = width;
 
    if (ctx->_ImageTransferState & IMAGE_CONVOLUTION_BIT) {
@@ -721,13 +792,19 @@ _mesa_store_teximage1d(GLcontext *ctx, GLenum target, GLint level,
 
    /* setup the teximage struct's fields */
    texImage->Format = (GLenum) _mesa_base_tex_format(ctx, internalFormat);
-   texImage->Type = CHAN_TYPE; /* usually GL_UNSIGNED_BYTE */
+   if (format == GL_DEPTH_COMPONENT) {
+      texImage->Type = GL_FLOAT; /* XXX or GL_UNSIGNED_INT? */
+      compSize = sizeof(GLfloat);
+   }
+   else {
+      texImage->Type = CHAN_TYPE; /* usually GL_UNSIGNED_BYTE */
+      compSize = sizeof(CHAN_TYPE);
+   }
    texImage->FetchTexel = fetch_1d_texel;
    set_teximage_component_sizes(texImage);
 
    /* allocate memory */
-   texImage->Data = (GLchan *) MALLOC(postConvWidth
-                                      * components * sizeof(GLchan));
+   texImage->Data = (GLchan *) MALLOC(postConvWidth * components * compSize);
    if (!texImage->Data)
       return;      /* out of memory */
 
@@ -757,6 +834,7 @@ _mesa_store_teximage2d(GLcontext *ctx, GLenum target, GLint level,
                        struct gl_texture_image *texImage)
 {
    const GLint components = components_in_intformat(internalFormat);
+   GLint compSize;
    GLint postConvWidth = width, postConvHeight = height;
 
    if (ctx->_ImageTransferState & IMAGE_CONVOLUTION_BIT) {
@@ -766,13 +844,20 @@ _mesa_store_teximage2d(GLcontext *ctx, GLenum target, GLint level,
 
    /* setup the teximage struct's fields */
    texImage->Format = (GLenum) _mesa_base_tex_format(ctx, internalFormat);
-   texImage->Type = CHAN_TYPE; /* usually GL_UNSIGNED_BYTE */
+   if (format == GL_DEPTH_COMPONENT) {
+      texImage->Type = GL_FLOAT; /* XXX or GL_UNSIGNED_INT? */
+      compSize = sizeof(GLfloat);
+   }
+   else {
+      texImage->Type = CHAN_TYPE; /* usually GL_UNSIGNED_BYTE */
+      compSize = sizeof(CHAN_TYPE);
+   }
    texImage->FetchTexel = fetch_2d_texel;
    set_teximage_component_sizes(texImage);
 
    /* allocate memory */
    texImage->Data = (GLchan *) MALLOC(postConvWidth * postConvHeight
-                                      * components * sizeof(GLchan));
+                                      * components * compSize);
    if (!texImage->Data)
       return;      /* out of memory */
 
@@ -803,16 +888,24 @@ _mesa_store_teximage3d(GLcontext *ctx, GLenum target, GLint level,
                        struct gl_texture_image *texImage)
 {
    const GLint components = components_in_intformat(internalFormat);
+   GLint compSize;
 
    /* setup the teximage struct's fields */
    texImage->Format = (GLenum) _mesa_base_tex_format(ctx, internalFormat);
-   texImage->Type = CHAN_TYPE; /* usually GL_UNSIGNED_BYTE */
+   if (format == GL_DEPTH_COMPONENT) {
+      texImage->Type = GL_FLOAT; /* XXX or GL_UNSIGNED_INT? */
+      compSize = sizeof(GLfloat);
+   }
+   else {
+      texImage->Type = CHAN_TYPE; /* usually GL_UNSIGNED_BYTE */
+      compSize = sizeof(CHAN_TYPE);
+   }
    texImage->FetchTexel = fetch_3d_texel;
    set_teximage_component_sizes(texImage);
 
    /* allocate memory */
    texImage->Data = (GLchan *) MALLOC(width * height * depth
-                                      * components * sizeof(GLchan));
+                                      * components * compSize);
    if (!texImage->Data)
       return;      /* out of memory */
 
@@ -861,10 +954,11 @@ _mesa_store_texsubimage2d(GLcontext *ctx, GLenum target, GLint level,
                           struct gl_texture_image *texImage)
 {
    const GLint components = components_in_intformat(texImage->IntFormat);
+   const GLint compSize = _mesa_sizeof_type(texImage->Type);
    _mesa_transfer_teximage(ctx, 2, texImage->Format, texImage->Data,
                            width, height, 1, /* src size */
                            xoffset, yoffset, 0, /* dest offsets */
-                           texImage->Width * components * sizeof(GLchan),
+                           texImage->Width * components * compSize,
                            0, /* dstImageStride */
                            format, type, pixels, packing);
 }
@@ -883,12 +977,13 @@ _mesa_store_texsubimage3d(GLcontext *ctx, GLenum target, GLint level,
                           struct gl_texture_image *texImage)
 {
    const GLint components = components_in_intformat(texImage->IntFormat);
+   const GLint compSize = _mesa_sizeof_type(texImage->Type);
    _mesa_transfer_teximage(ctx, 3, texImage->Format, texImage->Data,
                            width, height, depth, /* src size */
                            xoffset, yoffset, xoffset, /* dest offsets */
-                           texImage->Width * components * sizeof(GLchan),
+                           texImage->Width * components * compSize,
                            texImage->Width * texImage->Height * components
-                           * sizeof(GLchan),
+                           * compSize,
                            format, type, pixels, packing);
 }
 
@@ -963,6 +1058,7 @@ _mesa_test_proxy_teximage(GLcontext *ctx, GLenum target, GLint level,
    struct gl_texture_unit *texUnit;
    struct gl_texture_object *texObj;
    struct gl_texture_image *texImage;
+   GLint compSize;
 
    (void) format;
    (void) type;
@@ -978,7 +1074,14 @@ _mesa_test_proxy_teximage(GLcontext *ctx, GLenum target, GLint level,
     */
    /* setup the teximage struct's fields */
    texImage->Format = (GLenum) _mesa_base_tex_format(ctx, internalFormat);
-   texImage->Type = CHAN_TYPE; /* usually GL_UNSIGNED_BYTE */
+   if (format == GL_DEPTH_COMPONENT) {
+      texImage->Type = GL_FLOAT; /* XXX or GL_UNSIGNED_INT? */
+      compSize = sizeof(GLfloat);
+   }
+   else {
+      texImage->Type = CHAN_TYPE; /* usually GL_UNSIGNED_BYTE */
+      compSize = sizeof(CHAN_TYPE);
+   }
    set_teximage_component_sizes(texImage);
 
    return GL_TRUE;