intel: Add support for argb1555, argb4444 FBOs and fix rgb565 fbo readpixels.

Also enable them all regardless of screen bpp, as 32 bpp what I've been
testing against, and haven't been able to detect any screen bpp-specific
troubles with them.

5 files changed, 200 insertions, 100 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_blit.c b/src/mesa/drivers/dri/intel/intel_blit.c
index 4ae9b118a3d..49198281316 100644
--- a/src/mesa/drivers/dri/intel/intel_blit.c
+++ b/src/mesa/drivers/dri/intel/intel_blit.c
@@ -32,6 +32,8 @@
 #include "main/mtypes.h"
 #include "main/context.h"
 #include "main/enums.h"
+#include "main/texformat.h"
+#include "main/colormac.h"
 
 #include "intel_blit.h"
 #include "intel_buffers.h"
@@ -484,10 +486,9 @@ intelClearWithBlit(GLcontext *ctx, GLbitfield mask)
             const GLbitfield bufBit = 1 << buf;
             if ((clearMask & bufBit) && !(bufBit & skipBuffers)) {
                /* OK, clear this renderbuffer */
-               struct intel_region *irb_region =
-		  intel_get_rb_region(fb, buf);
+	       struct intel_renderbuffer *irb = intel_get_renderbuffer(fb, buf);
                dri_bo *write_buffer =
-                  intel_region_buffer(intel, irb_region,
+                  intel_region_buffer(intel, irb->region,
                                       all ? INTEL_WRITE_FULL :
                                       INTEL_WRITE_PART);
 
@@ -495,15 +496,13 @@ intelClearWithBlit(GLcontext *ctx, GLbitfield mask)
                GLint pitch, cpp;
                GLuint BR13, CMD;
 
-               ASSERT(irb_region);
-
-               pitch = irb_region->pitch;
-               cpp = irb_region->cpp;
+               pitch = irb->region->pitch;
+               cpp = irb->region->cpp;
 
                DBG("%s dst:buf(%p)/%d+%d %d,%d sz:%dx%d\n",
                    __FUNCTION__,
-                   irb_region->buffer, (pitch * cpp),
-                   irb_region->draw_offset,
+                   irb->region->buffer, (pitch * cpp),
+                   irb->region->draw_offset,
                    b.x1, b.y1, b.x2 - b.x1, b.y2 - b.y1);
 
 	       BR13 = 0xf0 << 16;
@@ -529,7 +528,7 @@ intelClearWithBlit(GLcontext *ctx, GLbitfield mask)
                }
 
 #ifndef I915
-	       if (irb_region->tiling != I915_TILING_NONE) {
+	       if (irb->region->tiling != I915_TILING_NONE) {
 		  CMD |= XY_DST_TILED;
 		  pitch /= 4;
 	       }
@@ -540,9 +539,36 @@ intelClearWithBlit(GLcontext *ctx, GLbitfield mask)
                   clearVal = clear_depth;
                }
                else {
-                  clearVal = (cpp == 4)
-                     ? intel->ClearColor8888 : intel->ClearColor565;
-               }
+		  uint8_t clear[4];
+		  GLclampf *color = ctx->Color.ClearColor;
+
+		  CLAMPED_FLOAT_TO_UBYTE(clear[0], color[0]);
+		  CLAMPED_FLOAT_TO_UBYTE(clear[1], color[1]);
+		  CLAMPED_FLOAT_TO_UBYTE(clear[2], color[2]);
+		  CLAMPED_FLOAT_TO_UBYTE(clear[3], color[3]);
+
+		  switch (irb->texformat->MesaFormat) {
+		  case MESA_FORMAT_ARGB8888:
+		     clearVal = intel->ClearColor8888;
+		     break;
+		  case MESA_FORMAT_RGB565:
+		     clearVal = intel->ClearColor565;
+		     break;
+		  case MESA_FORMAT_ARGB4444:
+		     clearVal = PACK_COLOR_4444(clear[3], clear[0],
+						clear[1], clear[2]);
+		     break;
+		  case MESA_FORMAT_ARGB1555:
+		     clearVal = PACK_COLOR_1555(clear[3], clear[0],
+						clear[1], clear[2]);
+		     break;
+		  default:
+		     _mesa_problem(ctx, "Unexpected renderbuffer format: %d\n",
+				   irb->texformat->MesaFormat);
+		     clearVal = 0;
+		  }
+	       }
+
                /*
                   _mesa_debug(ctx, "hardware blit clear buf %d rb id %d\n",
                   buf, irb->Base.Name);
@@ -558,7 +584,7 @@ intelClearWithBlit(GLcontext *ctx, GLbitfield mask)
                OUT_BATCH((b.y2 << 16) | b.x2);
                OUT_RELOC(write_buffer,
 			 I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
-                         irb_region->draw_offset);
+                         irb->region->draw_offset);
                OUT_BATCH(clearVal);
                ADVANCE_BATCH();
                clearMask &= ~bufBit;    /* turn off bit, for faster loop exit */
diff --git a/src/mesa/drivers/dri/intel/intel_context.h b/src/mesa/drivers/dri/intel/intel_context.h
index bd3810549aa..d798225ddd9 100644
--- a/src/mesa/drivers/dri/intel/intel_context.h
+++ b/src/mesa/drivers/dri/intel/intel_context.h
@@ -48,6 +48,8 @@
 #define DV_PF_555  (1<<8)
 #define DV_PF_565  (2<<8)
 #define DV_PF_8888 (3<<8)
+#define DV_PF_4444 (8<<8)
+#define DV_PF_1555 (9<<8)
 
 struct intel_region;
 struct intel_context;
@@ -337,6 +339,7 @@ extern char *__progname;
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
 #define ALIGN(value, alignment)  ((value + alignment - 1) & ~(alignment - 1))
+#define IS_POWER_OF_TWO(val) (((val) & (val - 1)) == 0)
 
 #define INTEL_FIREVERTICES(intel)		\
 do {						\
diff --git a/src/mesa/drivers/dri/intel/intel_fbo.c b/src/mesa/drivers/dri/intel/intel_fbo.c
index a401f730ba2..52647ddf8b2 100644
--- a/src/mesa/drivers/dri/intel/intel_fbo.c
+++ b/src/mesa/drivers/dri/intel/intel_fbo.c
@@ -119,6 +119,7 @@ intel_alloc_renderbuffer_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
       rb->RedBits = 5;
       rb->GreenBits = 6;
       rb->BlueBits = 5;
+      irb->texformat = &_mesa_texformat_rgb565;
       cpp = 2;
       break;
    case GL_RGB:
@@ -132,6 +133,7 @@ intel_alloc_renderbuffer_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
       rb->GreenBits = 8;
       rb->BlueBits = 8;
       rb->AlphaBits = 0;
+      irb->texformat = &_mesa_texformat_argb8888; /* XXX: Need xrgb8888 */
       cpp = 4;
       break;
    case GL_RGBA:
@@ -148,6 +150,7 @@ intel_alloc_renderbuffer_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
       rb->GreenBits = 8;
       rb->BlueBits = 8;
       rb->AlphaBits = 8;
+      irb->texformat = &_mesa_texformat_argb8888;
       cpp = 4;
       break;
    case GL_STENCIL_INDEX:
@@ -160,12 +163,14 @@ intel_alloc_renderbuffer_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
       rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
       rb->StencilBits = 8;
       cpp = 4;
+      irb->texformat = &_mesa_texformat_s8_z24;
       break;
    case GL_DEPTH_COMPONENT16:
       rb->_ActualFormat = GL_DEPTH_COMPONENT16;
       rb->DataType = GL_UNSIGNED_SHORT;
       rb->DepthBits = 16;
       cpp = 2;
+      irb->texformat = &_mesa_texformat_z16;
       break;
    case GL_DEPTH_COMPONENT:
    case GL_DEPTH_COMPONENT24:
@@ -174,6 +179,7 @@ intel_alloc_renderbuffer_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
       rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
       rb->DepthBits = 24;
       cpp = 4;
+      irb->texformat = &_mesa_texformat_s8_z24;
       break;
    case GL_DEPTH_STENCIL_EXT:
    case GL_DEPTH24_STENCIL8_EXT:
@@ -182,6 +188,7 @@ intel_alloc_renderbuffer_storage(GLcontext * ctx, struct gl_renderbuffer *rb,
       rb->DepthBits = 24;
       rb->StencilBits = 8;
       cpp = 4;
+      irb->texformat = &_mesa_texformat_s8_z24;
       break;
    default:
       _mesa_problem(ctx,
@@ -322,6 +329,7 @@ intel_create_renderbuffer(GLenum intFormat)
       irb->Base.GreenBits = 6;
       irb->Base.BlueBits = 5;
       irb->Base.DataType = GL_UNSIGNED_BYTE;
+      irb->texformat = &_mesa_texformat_rgb565;
       break;
    case GL_RGB8:
       irb->Base._ActualFormat = GL_RGB8;
@@ -331,6 +339,7 @@ intel_create_renderbuffer(GLenum intFormat)
       irb->Base.BlueBits = 8;
       irb->Base.AlphaBits = 0;
       irb->Base.DataType = GL_UNSIGNED_BYTE;
+      irb->texformat = &_mesa_texformat_argb8888; /* XXX: Need xrgb8888 */
       break;
    case GL_RGBA8:
       irb->Base._ActualFormat = GL_RGBA8;
@@ -340,24 +349,28 @@ intel_create_renderbuffer(GLenum intFormat)
       irb->Base.BlueBits = 8;
       irb->Base.AlphaBits = 8;
       irb->Base.DataType = GL_UNSIGNED_BYTE;
+      irb->texformat = &_mesa_texformat_argb8888;
       break;
    case GL_STENCIL_INDEX8_EXT:
       irb->Base._ActualFormat = GL_STENCIL_INDEX8_EXT;
       irb->Base._BaseFormat = GL_STENCIL_INDEX;
       irb->Base.StencilBits = 8;
       irb->Base.DataType = GL_UNSIGNED_BYTE;
+      irb->texformat = &_mesa_texformat_s8_z24;
       break;
    case GL_DEPTH_COMPONENT16:
       irb->Base._ActualFormat = GL_DEPTH_COMPONENT16;
       irb->Base._BaseFormat = GL_DEPTH_COMPONENT;
       irb->Base.DepthBits = 16;
       irb->Base.DataType = GL_UNSIGNED_SHORT;
+      irb->texformat = &_mesa_texformat_z16;
       break;
    case GL_DEPTH_COMPONENT24:
       irb->Base._ActualFormat = GL_DEPTH24_STENCIL8_EXT;
       irb->Base._BaseFormat = GL_DEPTH_COMPONENT;
       irb->Base.DepthBits = 24;
       irb->Base.DataType = GL_UNSIGNED_INT;
+      irb->texformat = &_mesa_texformat_s8_z24;
       break;
    case GL_DEPTH24_STENCIL8_EXT:
       irb->Base._ActualFormat = GL_DEPTH24_STENCIL8_EXT;
@@ -365,6 +378,7 @@ intel_create_renderbuffer(GLenum intFormat)
       irb->Base.DepthBits = 24;
       irb->Base.StencilBits = 8;
       irb->Base.DataType = GL_UNSIGNED_INT_24_8_EXT;
+      irb->texformat = &_mesa_texformat_s8_z24;
       break;
    default:
       _mesa_problem(NULL,
@@ -449,6 +463,8 @@ static GLboolean
 intel_update_wrapper(GLcontext *ctx, struct intel_renderbuffer *irb, 
 		     struct gl_texture_image *texImage)
 {
+   irb->texformat = texImage->TexFormat;
+
    if (texImage->TexFormat == &_mesa_texformat_argb8888) {
       irb->Base._ActualFormat = GL_RGBA8;
       irb->Base._BaseFormat = GL_RGBA;
@@ -458,9 +474,21 @@ intel_update_wrapper(GLcontext *ctx, struct intel_renderbuffer *irb,
    else if (texImage->TexFormat == &_mesa_texformat_rgb565) {
       irb->Base._ActualFormat = GL_RGB5;
       irb->Base._BaseFormat = GL_RGB;
-      irb->Base.DataType = GL_UNSIGNED_SHORT;
+      irb->Base.DataType = GL_UNSIGNED_BYTE;
       DBG("Render to RGB5 texture OK\n");
    }
+   else if (texImage->TexFormat == &_mesa_texformat_argb1555) {
+      irb->Base._ActualFormat = GL_RGB5_A1;
+      irb->Base._BaseFormat = GL_RGBA;
+      irb->Base.DataType = GL_UNSIGNED_BYTE;
+      DBG("Render to ARGB1555 texture OK\n");
+   }
+   else if (texImage->TexFormat == &_mesa_texformat_argb4444) {
+      irb->Base._ActualFormat = GL_RGBA4;
+      irb->Base._BaseFormat = GL_RGBA;
+      irb->Base.DataType = GL_UNSIGNED_BYTE;
+      DBG("Render to ARGB4444 texture OK\n");
+   }
    else if (texImage->TexFormat == &_mesa_texformat_z16) {
       irb->Base._ActualFormat = GL_DEPTH_COMPONENT16;
       irb->Base._BaseFormat = GL_DEPTH_COMPONENT;
@@ -631,11 +659,11 @@ intel_finish_render_texture(GLcontext * ctx,
 static void
 intel_validate_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
 {
-   struct intel_context *intel = intel_context(ctx);
    const struct intel_renderbuffer *depthRb =
       intel_get_renderbuffer(fb, BUFFER_DEPTH);
    const struct intel_renderbuffer *stencilRb =
       intel_get_renderbuffer(fb, BUFFER_STENCIL);
+   int i;
 
    if (stencilRb && stencilRb != depthRb) {
       /* we only support combined depth/stencil buffers, not separate
@@ -644,32 +672,21 @@ intel_validate_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
    }
 
-   /* check that texture color buffers are a format we can render into */
-   {
-      const struct gl_texture_format *supportedFormat;
-      GLuint i;
+   for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
+      struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[i];
+      struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 
-      /* The texture format we can render into seems to depend on the
-       * screen depth.  There currently seems to be a problem when
-       * rendering into a rgb565 texture when the screen is abgr8888.
-       */
+      if (rb == NULL)
+	 continue;
 
-      if (intel->ctx.Visual.rgbBits >= 24)
-         supportedFormat = &_mesa_texformat_argb8888;
-      else 
-         supportedFormat = &_mesa_texformat_rgb565;
-
-      for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
-         const struct gl_texture_object *texObj =
-            fb->Attachment[BUFFER_COLOR0 + i].Texture;
-         if (texObj) {
-            const struct gl_texture_image *texImg =
-               texObj->Image[0][texObj->BaseLevel];
-            if (texImg && texImg->TexFormat != supportedFormat) {
-               fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
-               break;
-            }
-         }
+      switch (irb->texformat->MesaFormat) {
+      case MESA_FORMAT_ARGB8888:
+      case MESA_FORMAT_RGB565:
+      case MESA_FORMAT_ARGB1555:
+      case MESA_FORMAT_ARGB4444:
+	 break;
+      default:
+	 fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
       }
    }
 }
diff --git a/src/mesa/drivers/dri/intel/intel_fbo.h b/src/mesa/drivers/dri/intel/intel_fbo.h
index 7226ee026f6..f0665af482e 100644
--- a/src/mesa/drivers/dri/intel/intel_fbo.h
+++ b/src/mesa/drivers/dri/intel/intel_fbo.h
@@ -61,6 +61,8 @@ struct intel_renderbuffer
    struct gl_renderbuffer Base;
    struct intel_region *region;
 
+   const struct gl_texture_format *texformat;
+
    GLuint vbl_pending;   /**< vblank sequence number of pending flip */
 
    uint8_t *span_cache;
diff --git a/src/mesa/drivers/dri/intel/intel_span.c b/src/mesa/drivers/dri/intel/intel_span.c
index c3a873f1abd..34b78ebc1ab 100644
--- a/src/mesa/drivers/dri/intel/intel_span.c
+++ b/src/mesa/drivers/dri/intel/intel_span.c
@@ -29,6 +29,7 @@
 #include "main/macros.h"
 #include "main/mtypes.h"
 #include "main/colormac.h"
+#include "main/texformat.h"
 
 #include "intel_buffers.h"
 #include "intel_fbo.h"
@@ -313,6 +314,22 @@ static uint32_t y_tile_swizzle(struct intel_renderbuffer *irb,
 #define INTEL_TAG(x) x##_RGB565
 #include "intel_spantmp.h"
 
+/* a4r4g4b4 color span and pixel functions */
+#define INTEL_PIXEL_FMT GL_BGRA
+#define INTEL_PIXEL_TYPE GL_UNSIGNED_SHORT_4_4_4_4_REV
+#define INTEL_READ_VALUE(offset) pread_16(irb, offset)
+#define INTEL_WRITE_VALUE(offset, v) pwrite_16(irb, offset, v)
+#define INTEL_TAG(x) x##_ARGB4444
+#include "intel_spantmp.h"
+
+/* a1r5g5b5 color span and pixel functions */
+#define INTEL_PIXEL_FMT GL_BGRA
+#define INTEL_PIXEL_TYPE GL_UNSIGNED_SHORT_1_5_5_5_REV
+#define INTEL_READ_VALUE(offset) pread_16(irb, offset)
+#define INTEL_WRITE_VALUE(offset, v) pwrite_16(irb, offset, v)
+#define INTEL_TAG(x) x##_ARGB1555
+#include "intel_spantmp.h"
+
 /* a8r8g8b8 color span and pixel functions */
 #define INTEL_PIXEL_FMT GL_BGRA
 #define INTEL_PIXEL_TYPE GL_UNSIGNED_INT_8_8_8_8_REV
@@ -561,8 +578,8 @@ intel_set_span_functions(struct intel_context *intel,
    else
       tiling = I915_TILING_NONE;
 
-   if (rb->_ActualFormat == GL_RGB5) {
-      /* 565 RGB */
+   switch (irb->texformat->MesaFormat) {
+   case MESA_FORMAT_RGB565:
       switch (tiling) {
       case I915_TILING_NONE:
       default:
@@ -575,38 +592,67 @@ intel_set_span_functions(struct intel_context *intel,
 	 intel_YTile_InitPointers_RGB565(rb);
 	 break;
       }
-   }
-   else if (rb->_ActualFormat == GL_RGB8) {
-      /* 8888 RGBx */
+      break;
+   case MESA_FORMAT_ARGB4444:
       switch (tiling) {
       case I915_TILING_NONE:
       default:
-	 intelInitPointers_xRGB8888(rb);
+	 intelInitPointers_ARGB4444(rb);
 	 break;
       case I915_TILING_X:
-	 intel_XTile_InitPointers_xRGB8888(rb);
+	 intel_XTile_InitPointers_ARGB4444(rb);
 	 break;
       case I915_TILING_Y:
-	 intel_YTile_InitPointers_xRGB8888(rb);
+	 intel_YTile_InitPointers_ARGB4444(rb);
 	 break;
       }
-   }
-   else if (rb->_ActualFormat == GL_RGBA8) {
-      /* 8888 RGBA */
+      break;
+   case MESA_FORMAT_ARGB1555:
       switch (tiling) {
       case I915_TILING_NONE:
       default:
-	 intelInitPointers_ARGB8888(rb);
+	 intelInitPointers_ARGB1555(rb);
 	 break;
       case I915_TILING_X:
-	 intel_XTile_InitPointers_ARGB8888(rb);
+	 intel_XTile_InitPointers_ARGB1555(rb);
 	 break;
       case I915_TILING_Y:
-	 intel_YTile_InitPointers_ARGB8888(rb);
+	 intel_YTile_InitPointers_ARGB1555(rb);
 	 break;
       }
-   }
-   else if (rb->_ActualFormat == GL_DEPTH_COMPONENT16) {
+      break;
+   case MESA_FORMAT_ARGB8888:
+      if (rb->AlphaBits == 0) { /* XXX: Need xRGB8888 Mesa format */
+	 /* 8888 RGBx */
+	 switch (tiling) {
+	 case I915_TILING_NONE:
+	 default:
+	    intelInitPointers_xRGB8888(rb);
+	    break;
+	 case I915_TILING_X:
+	    intel_XTile_InitPointers_xRGB8888(rb);
+	    break;
+	 case I915_TILING_Y:
+	    intel_YTile_InitPointers_xRGB8888(rb);
+	    break;
+	 }
+      } else {
+	 /* 8888 RGBA */
+	 switch (tiling) {
+	 case I915_TILING_NONE:
+	 default:
+	    intelInitPointers_ARGB8888(rb);
+	    break;
+	 case I915_TILING_X:
+	    intel_XTile_InitPointers_ARGB8888(rb);
+	    break;
+	 case I915_TILING_Y:
+	    intel_YTile_InitPointers_ARGB8888(rb);
+	    break;
+	 }
+      }
+      break;
+   case MESA_FORMAT_Z16:
       switch (tiling) {
       case I915_TILING_NONE:
       default:
@@ -619,51 +665,57 @@ intel_set_span_functions(struct intel_context *intel,
 	 intel_YTile_InitDepthPointers_z16(rb);
 	 break;
       }
-   }
-   else if (rb->_ActualFormat == GL_DEPTH_COMPONENT24) {
-      switch (tiling) {
-      case I915_TILING_NONE:
-      default:
-	 intelInitDepthPointers_z24(rb);
-	 break;
-      case I915_TILING_X:
-	 intel_XTile_InitDepthPointers_z24(rb);
-	 break;
-      case I915_TILING_Y:
-	 intel_YTile_InitDepthPointers_z24(rb);
-	 break;
-      }
-   }
-   else if (rb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT) {
-      switch (tiling) {
-      case I915_TILING_NONE:
-      default:
-	 intelInitDepthPointers_z24_s8(rb);
-	 break;
-      case I915_TILING_X:
-	 intel_XTile_InitDepthPointers_z24_s8(rb);
-	 break;
-      case I915_TILING_Y:
-	 intel_YTile_InitDepthPointers_z24_s8(rb);
-	 break;
-      }
-   }
-   else if (rb->_ActualFormat == GL_STENCIL_INDEX8_EXT) {
-      switch (tiling) {
-      case I915_TILING_NONE:
-      default:
-	 intelInitStencilPointers_z24_s8(rb);
-	 break;
-      case I915_TILING_X:
-	 intel_XTile_InitStencilPointers_z24_s8(rb);
-	 break;
-      case I915_TILING_Y:
-	 intel_YTile_InitStencilPointers_z24_s8(rb);
-	 break;
+      break;
+   case MESA_FORMAT_S8_Z24:
+      /* There are a few different ways SW asks us to access the S8Z24 data:
+       * Z24 depth-only depth reads
+       * S8Z24 depth reads
+       * S8Z24 stencil reads.
+       */
+      if (rb->_ActualFormat == GL_DEPTH_COMPONENT24) {
+	 switch (tiling) {
+	 case I915_TILING_NONE:
+	 default:
+	    intelInitDepthPointers_z24(rb);
+	    break;
+	 case I915_TILING_X:
+	    intel_XTile_InitDepthPointers_z24(rb);
+	    break;
+	 case I915_TILING_Y:
+	    intel_YTile_InitDepthPointers_z24(rb);
+	    break;
+	 }
+      } else if (rb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT) {
+	 switch (tiling) {
+	 case I915_TILING_NONE:
+	 default:
+	    intelInitDepthPointers_z24_s8(rb);
+	    break;
+	 case I915_TILING_X:
+	    intel_XTile_InitDepthPointers_z24_s8(rb);
+	    break;
+	 case I915_TILING_Y:
+	    intel_YTile_InitDepthPointers_z24_s8(rb);
+	    break;
+	 }
+      } else if (rb->_ActualFormat == GL_STENCIL_INDEX8_EXT) {
+	 switch (tiling) {
+	 case I915_TILING_NONE:
+	 default:
+	    intelInitStencilPointers_z24_s8(rb);
+	    break;
+	 case I915_TILING_X:
+	    intel_XTile_InitStencilPointers_z24_s8(rb);
+	    break;
+	 case I915_TILING_Y:
+	    intel_YTile_InitStencilPointers_z24_s8(rb);
+	    break;
+	 }
       }
-   }
-   else {
+      break;
+   default:
       _mesa_problem(NULL,
-                    "Unexpected _ActualFormat in intelSetSpanFunctions");
+                    "Unexpected MesaFormat in intelSetSpanFunctions");
+      break;
    }
 }