Unify ARB_depth_texture and SGIX_depth_texture

The ARB extension is a superset of the older SGIX extension.  Any
hardware that can support the SGIX version can also support the ARB
version.  In Mesa, any driver that supports one also supports the
other.  This unification just simplifies some bits of code.

src/mesa/drivers/dri/i915/i915_context.c

@@ -56,8 +56,6 @@ static const struct dri_extension i915_extensions[] = {
    {"GL_ARB_shadow", NULL},
    {"GL_ARB_texture_non_power_of_two", NULL},
    {"GL_EXT_shadow_funcs", NULL},
-   /* ARB extn won't work if not enabled */
-   {"GL_SGIX_depth_texture", NULL},
    {NULL, NULL}
 };
 

src/mesa/drivers/dri/intel/intel_context.c

@@ -404,8 +404,6 @@ static const struct dri_extension brw_extensions[] = {
    { "GL_ARB_vertex_shader",              GL_ARB_vertex_shader_functions },
    { "GL_EXT_shadow_funcs",               NULL },
    { "GL_EXT_texture_sRGB",		  NULL },
-   /* ARB extn won't work if not enabled */
-   { "GL_SGIX_depth_texture",             NULL },
    { NULL,                                NULL }
 };
 

src/mesa/drivers/dri/intel/intel_tex_copy.c

@@ -60,7 +60,7 @@ get_teximage_source(struct intel_context *intel, GLenum internalFormat)
 
    switch (internalFormat) {
    case GL_DEPTH_COMPONENT:
-   case GL_DEPTH_COMPONENT16_ARB:
+   case GL_DEPTH_COMPONENT16:
       irb = intel_get_renderbuffer(intel->ctx.ReadBuffer, BUFFER_DEPTH);
       if (irb && irb->region && irb->region->cpp == 2)
          return irb->region;

src/mesa/drivers/dri/r300/r300_context.c

@@ -138,7 +138,6 @@ const struct dri_extension card_extensions[] = {
   {"GL_NV_blend_square",		NULL},
   {"GL_NV_vertex_program",		GL_NV_vertex_program_functions},
   {"GL_SGIS_generate_mipmap",		NULL},
-  {"GL_SGIX_depth_texture",		NULL},
   {NULL,				NULL}
   /* *INDENT-ON* */
 };

src/mesa/main/depthstencil.c

@@ -282,8 +282,8 @@ _mesa_new_z24_renderbuffer_wrapper(GLcontext *ctx,
    z24rb->RefCount = 1;
    z24rb->Width = dsrb->Width;
    z24rb->Height = dsrb->Height;
-   z24rb->InternalFormat = GL_DEPTH_COMPONENT24_ARB;
-   z24rb->_ActualFormat = GL_DEPTH_COMPONENT24_ARB;
+   z24rb->InternalFormat = GL_DEPTH_COMPONENT24;
+   z24rb->_ActualFormat = GL_DEPTH_COMPONENT24;
    z24rb->_BaseFormat = GL_DEPTH_COMPONENT;
    z24rb->DataType = GL_UNSIGNED_INT;
    z24rb->DepthBits = 24;

src/mesa/main/extensions.c

@@ -165,7 +165,7 @@ static const struct {
    { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
    { ON,  "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
    { ON,  "GL_SGIS_texture_lod",               F(SGIS_texture_lod) },
-   { OFF, "GL_SGIX_depth_texture",             F(SGIX_depth_texture) },
+   { OFF, "GL_SGIX_depth_texture",             F(ARB_depth_texture) },
    { OFF, "GL_SGIX_shadow",                    F(SGIX_shadow) },
    { OFF, "GL_SGIX_shadow_ambient",            F(SGIX_shadow_ambient) },
    { OFF, "GL_SUN_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
@@ -292,7 +292,6 @@ _mesa_enable_sw_extensions(GLcontext *ctx)
    ctx->Extensions.SGI_texture_color_table = GL_TRUE;
    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
    ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
-   ctx->Extensions.SGIX_depth_texture = GL_TRUE;
    ctx->Extensions.SGIX_shadow = GL_TRUE;
    ctx->Extensions.SGIX_shadow_ambient = GL_TRUE;
 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program

src/mesa/main/mtypes.h

@@ -2626,7 +2626,6 @@ struct gl_extensions
    GLboolean SGIS_generate_mipmap;
    GLboolean SGIS_texture_edge_clamp;
    GLboolean SGIS_texture_lod;
-   GLboolean SGIX_depth_texture;
    GLboolean SGIX_shadow;
    GLboolean SGIX_shadow_ambient; /* or GL_ARB_shadow_ambient */
    GLboolean TDFX_texture_compression_FXT1;

src/mesa/main/texformat.c

@@ -1420,14 +1420,13 @@ _mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
          ; /* fallthrough */
    }
 
-   if (ctx->Extensions.SGIX_depth_texture ||
-       ctx->Extensions.ARB_depth_texture) {
+   if (ctx->Extensions.ARB_depth_texture) {
       switch (internalFormat) {
          case GL_DEPTH_COMPONENT:
-         case GL_DEPTH_COMPONENT24_SGIX:
-         case GL_DEPTH_COMPONENT32_SGIX:
+         case GL_DEPTH_COMPONENT24:
+         case GL_DEPTH_COMPONENT32:
             return &_mesa_texformat_z32;
-         case GL_DEPTH_COMPONENT16_SGIX:
+         case GL_DEPTH_COMPONENT16:
             return &_mesa_texformat_z16;
          default:
             ; /* fallthrough */

src/mesa/main/teximage.c

@@ -241,13 +241,12 @@ _mesa_base_tex_format( GLcontext *ctx, GLint internalFormat )
       }
    }
 
-   if (ctx->Extensions.SGIX_depth_texture ||
-       ctx->Extensions.ARB_depth_texture) {
+   if (ctx->Extensions.ARB_depth_texture) {
       switch (internalFormat) {
          case GL_DEPTH_COMPONENT:
-         case GL_DEPTH_COMPONENT16_SGIX:
-         case GL_DEPTH_COMPONENT24_SGIX:
-         case GL_DEPTH_COMPONENT32_SGIX:
+         case GL_DEPTH_COMPONENT16:
+         case GL_DEPTH_COMPONENT24:
+         case GL_DEPTH_COMPONENT32:
             return GL_DEPTH_COMPONENT;
          default:
             ; /* fallthrough */
@@ -526,9 +525,9 @@ static GLboolean
 is_depth_format(GLenum format)
 {
    switch (format) {
-      case GL_DEPTH_COMPONENT16_ARB:
-      case GL_DEPTH_COMPONENT24_ARB:
-      case GL_DEPTH_COMPONENT32_ARB:
+      case GL_DEPTH_COMPONENT16:
+      case GL_DEPTH_COMPONENT24:
+      case GL_DEPTH_COMPONENT32:
       case GL_DEPTH_COMPONENT:
          return GL_TRUE;
       default:
@@ -2297,8 +2296,7 @@ _mesa_GetTexImage( GLenum target, GLint level, GLenum format,
       return;
    }
 
-   if (!ctx->Extensions.SGIX_depth_texture &&
-       !ctx->Extensions.ARB_depth_texture && is_depth_format(format)) {
+   if (!ctx->Extensions.ARB_depth_texture && is_depth_format(format)) {
       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
       return;
    }

src/mesa/main/texparam.c

@@ -642,8 +642,7 @@ _mesa_GetTexLevelParameteriv( GLenum target, GLint level,
             *params = 0;
          break;
       case GL_TEXTURE_DEPTH_SIZE_ARB:
-         if (ctx->Extensions.SGIX_depth_texture ||
-             ctx->Extensions.ARB_depth_texture)
+         if (ctx->Extensions.ARB_depth_texture)
             *params = img->TexFormat->DepthBits;
          else
             _mesa_error(ctx, GL_INVALID_ENUM,

src/mesa/swrast/s_texstore.c

@@ -216,9 +216,9 @@ is_depth_format(GLenum format)
 {
    switch (format) {
       case GL_DEPTH_COMPONENT:
-      case GL_DEPTH_COMPONENT16_SGIX:
-      case GL_DEPTH_COMPONENT24_SGIX:
-      case GL_DEPTH_COMPONENT32_SGIX:
+      case GL_DEPTH_COMPONENT16:
+      case GL_DEPTH_COMPONENT24:
+      case GL_DEPTH_COMPONENT32:
          return GL_TRUE;
       default:
          return GL_FALSE;