r300g: Enable more stuff in r300_screen, cleanup comments.

Also enable 24-bit depth buffers without stencil.

src/gallium/drivers/r300/r300_screen.c

@@ -80,13 +80,10 @@ static int r300_get_param(struct pipe_screen* pscreen, int param)
     struct r300_screen* r300screen = r300_screen(pscreen);
 
     switch (param) {
-        /* XXX cases marked "IN THEORY" are possible on the hardware,
-         * but haven't been implemented yet. */
         case PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS:
             /* XXX I'm told this goes up to 16 */
             return 8;
         case PIPE_CAP_NPOT_TEXTURES:
-            /* IN THEORY */
             return 0;
         case PIPE_CAP_TWO_SIDED_STENCIL:
             if (r300screen->caps->is_r500) {
@@ -95,16 +92,26 @@ static int r300_get_param(struct pipe_screen* pscreen, int param)
                 return 0;
             }
         case PIPE_CAP_GLSL:
-            if (r300screen->caps->is_r500) {
-                return 1;
-            } else {
-                return 0;
-            }
+            /* I'll be frank. This is a lie.
+             *
+             * We don't truly support GLSL on any of this driver's chipsets.
+             * To be fair, no chipset supports the full GLSL specification
+             * to the best of our knowledge, but some of the less esoteric
+             * features are still missing here.
+             *
+             * Rather than cripple ourselves intentionally, I'm going to set
+             * this flag, and as Gallium's interface continues to change, I
+             * hope that this single monolithic GLSL enable can slowly get
+             * split down into many different pieces and the state tracker
+             * will handle fallbacks transparently, like it should.
+             *
+             * ~ C.
+             */
+            return 1;
         case PIPE_CAP_ANISOTROPIC_FILTER:
             return 1;
         case PIPE_CAP_POINT_SPRITE:
-            /* IN THEORY */
-            return 0;
+            return 1;
         case PIPE_CAP_MAX_RENDER_TARGETS:
             return 4;
         case PIPE_CAP_OCCLUSION_QUERY:
@@ -145,10 +152,8 @@ static int r300_get_param(struct pipe_screen* pscreen, int param)
         case PIPE_CAP_TEXTURE_MIRROR_REPEAT:
             return 1;
         case PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS:
-            /* XXX guessing (what a terrible guess) */
-            return 2;
+            return 0;
         case PIPE_CAP_TGSI_CONT_SUPPORTED:
-            /* XXX */
             return 0;
         case PIPE_CAP_BLEND_EQUATION_SEPARATE:
             return 1;
@@ -229,6 +234,7 @@ static boolean check_tex_2d_format(enum pipe_format format, uint32_t usage,
 
         /* Z buffer or texture */
         case PIPE_FORMAT_Z16_UNORM:
+        case PIPE_FORMAT_Z24X8_UNORM:
         /* Z buffer with stencil or texture */
         case PIPE_FORMAT_Z24S8_UNORM:
             retval = usage &
@@ -239,7 +245,6 @@ static boolean check_tex_2d_format(enum pipe_format format, uint32_t usage,
         /* Definitely unsupported formats. */
         /* Non-usable Z buffer/stencil formats. */
         case PIPE_FORMAT_Z32_UNORM:
-        case PIPE_FORMAT_Z24X8_UNORM:
         case PIPE_FORMAT_S8Z24_UNORM:
         case PIPE_FORMAT_X8Z24_UNORM:
             debug_printf("r300: Note: Got unsupported format: %s in %s\n",
@@ -249,7 +254,6 @@ static boolean check_tex_2d_format(enum pipe_format format, uint32_t usage,
         /* XXX These don't even exist
         case PIPE_FORMAT_A32R32G32B32:
         case PIPE_FORMAT_A16R16G16B16: */
-        /* XXX Insert YUV422 packed VYUY and YVYU here */
         /* XXX What the deuce is UV88? (r3xx accel page 14)
             debug_printf("r300: Warning: Got unimplemented format: %s in %s\n",
                 pf_name(format), __FUNCTION__);

src/gallium/drivers/r300/r300_state_inlines.h

@@ -330,13 +330,15 @@ static INLINE uint32_t r300_translate_colorformat(enum pipe_format format)
     return 0;
 }
 
-/* Depthbuffer and stencilbuffer. Thankfully, we only support two kinds. */
+/* Depthbuffer and stencilbuffer. Thankfully, we only support two flavors. */
 static INLINE uint32_t r300_translate_zsformat(enum pipe_format format)
 {
     switch (format) {
         /* 16-bit depth, no stencil */
         case PIPE_FORMAT_Z16_UNORM:
             return R300_DEPTHFORMAT_16BIT_INT_Z;
+        /* 24-bit depth, ignored stencil */
+        case PIPE_FORMAT_Z24X8_UNORM:
         /* 24-bit depth, 8-bit stencil */
         case PIPE_FORMAT_Z24S8_UNORM:
             return R300_DEPTHFORMAT_24BIT_INT_Z_8BIT_STENCIL;

src/gallium/drivers/r300/r300_texture.h

@@ -80,6 +80,7 @@ static INLINE uint32_t r300_translate_texformat(enum pipe_format format)
                 R300_TX_FORMAT_YUV_TO_RGB;
         /* W24_FP */
         case PIPE_FORMAT_Z24S8_UNORM:
+        case PIPE_FORMAT_Z24X8_UNORM:
             return R300_EASY_TX_FORMAT(X, X, X, X, W24_FP);
         default:
             debug_printf("r300: Implementation error: "