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.

9 files changed, 346 insertions, 125 deletions

diff --git a/src/mesa/drivers/dri/common/spantmp2.h b/src/mesa/drivers/dri/common/spantmp2.h
index f2868cb58a..89c815722f 100644
--- a/src/mesa/drivers/dri/common/spantmp2.h
+++ b/src/mesa/drivers/dri/common/spantmp2.h
@@ -82,6 +82,71 @@
       rgba[3] = 0xff;							\
    } while (0)
 
+#elif (SPANTMP_PIXEL_FMT == GL_BGRA)  && (SPANTMP_PIXEL_TYPE == GL_UNSIGNED_SHORT_4_4_4_4_REV)
+
+/**
+ ** GL_BGRA, GL_UNSIGNED_SHORT_4_4_4_4_REV
+ **/
+
+#ifndef GET_VALUE
+#ifndef GET_PTR
+#define GET_PTR(_x, _y) (buf + (_x) * 2 + (_y) * pitch)
+#endif
+
+#define GET_VALUE(_x, _y) *(volatile GLushort *)(GET_PTR(_x, _y))
+#define PUT_VALUE(_x, _y, _v) *(volatile GLushort *)(GET_PTR(_x, _y)) = (_v)
+#endif /* GET_VALUE */
+
+#define INIT_MONO_PIXEL(p, color) \
+   p = PACK_COLOR_4444(color[3], color[0], color[1], color[2])
+
+#define WRITE_RGBA( _x, _y, r, g, b, a )				\
+   PUT_VALUE(_x, _y, PACK_COLOR_4444(a, r, g, b))			\
+
+#define WRITE_PIXEL( _x, _y, p ) PUT_VALUE(_x, _y, p)
+
+#define READ_RGBA( rgba, _x, _y )					\
+   do {									\
+      GLushort p = GET_VALUE(_x, _y);					\
+      rgba[0] = ((p >> 8) & 0xf) * 0x11;				\
+      rgba[1] = ((p >> 4) & 0xf) * 0x11;				\
+      rgba[2] = ((p >> 0) & 0xf) * 0x11;				\
+      rgba[3] = ((p >> 12) & 0xf) * 0x11;				\
+   } while (0)
+
+
+#elif (SPANTMP_PIXEL_FMT == GL_BGRA)  && (SPANTMP_PIXEL_TYPE == GL_UNSIGNED_SHORT_1_5_5_5_REV)
+
+/**
+ ** GL_BGRA, GL_UNSIGNED_SHORT_1_5_5_5_REV
+ **/
+
+#ifndef GET_VALUE
+#ifndef GET_PTR
+#define GET_PTR(_x, _y) (buf + (_x) * 2 + (_y) * pitch)
+#endif
+
+#define GET_VALUE(_x, _y) *(volatile GLushort *)(GET_PTR(_x, _y))
+#define PUT_VALUE(_x, _y, _v) *(volatile GLushort *)(GET_PTR(_x, _y)) = (_v)
+#endif /* GET_VALUE */
+
+#define INIT_MONO_PIXEL(p, color) \
+   p = PACK_COLOR_1555(color[3], color[0], color[1], color[2])
+
+#define WRITE_RGBA( _x, _y, r, g, b, a )				\
+   PUT_VALUE(_x, _y, PACK_COLOR_1555(a, r, g, b))			\
+
+#define WRITE_PIXEL( _x, _y, p ) PUT_VALUE(_x, _y, p)
+
+#define READ_RGBA( rgba, _x, _y )					\
+   do {									\
+      GLushort p = GET_VALUE(_x, _y);					\
+      rgba[0] = ((p >> 7) & 0xf8) * 255 / 0xf8;				\
+      rgba[1] = ((p >> 2) & 0xf8) * 255 / 0xf8;				\
+      rgba[2] = ((p << 3) & 0xf8) * 255 / 0xf8;				\
+      rgba[3] = ((p >> 15) & 0x1) * 0xff;				\
+   } while (0)
+
 #elif (SPANTMP_PIXEL_FMT == GL_BGRA) && (SPANTMP_PIXEL_TYPE == GL_UNSIGNED_INT_8_8_8_8_REV)
 
 /**
diff --git a/src/mesa/drivers/dri/i915/i830_vtbl.c b/src/mesa/drivers/dri/i915/i830_vtbl.c
index 1a94921078..3bf02de61f 100644
--- a/src/mesa/drivers/dri/i915/i830_vtbl.c
+++ b/src/mesa/drivers/dri/i915/i830_vtbl.c
@@ -26,12 +26,14 @@
  **************************************************************************/
 
 #include "glapi/glapi.h"
+#include "main/texformat.h"
 
 #include "i830_context.h"
 #include "i830_reg.h"
 #include "intel_batchbuffer.h"
 #include "intel_regions.h"
 #include "intel_tris.h"
+#include "intel_fbo.h"
 #include "tnl/t_context.h"
 #include "tnl/t_vertex.h"
 
@@ -614,6 +616,8 @@ i830_state_draw_region(struct intel_context *intel,
 {
    struct i830_context *i830 = i830_context(&intel->ctx);
    GLcontext *ctx = &intel->ctx;
+   struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
+   struct intel_renderbuffer *irb = intel_renderbuffer(rb);
    GLuint value;
 
    ASSERT(state == &i830->state || state == &i830->meta);
@@ -651,13 +655,27 @@ i830_state_draw_region(struct intel_context *intel,
     */
    value = (DSTORG_HORT_BIAS(0x8) |     /* .5 */
             DSTORG_VERT_BIAS(0x8) | DEPTH_IS_Z);    /* .5 */
-            
-   if (color_region && color_region->cpp == 4) {
-      value |= DV_PF_8888;
-   }
-   else {
-      value |= DV_PF_565;
+
+   if (irb != NULL) {
+      switch (irb->texformat->MesaFormat) {
+      case MESA_FORMAT_ARGB8888:
+	 value |= DV_PF_8888;
+	 break;
+      case MESA_FORMAT_RGB565:
+	 value |= DV_PF_565;
+	 break;
+      case MESA_FORMAT_ARGB1555:
+	 value |= DV_PF_1555;
+	 break;
+      case MESA_FORMAT_ARGB4444:
+	 value |= DV_PF_4444;
+	 break;
+      default:
+	 _mesa_problem(ctx, "Bad renderbuffer format: %d\n",
+		       irb->texformat->MesaFormat);
+      }
    }
+
    if (depth_region && depth_region->cpp == 4) {
       value |= DEPTH_FRMT_24_FIXED_8_OTHER;
    }
diff --git a/src/mesa/drivers/dri/i915/i915_vtbl.c b/src/mesa/drivers/dri/i915/i915_vtbl.c
index 3f6d282d34..115004616f 100644
--- a/src/mesa/drivers/dri/i915/i915_vtbl.c
+++ b/src/mesa/drivers/dri/i915/i915_vtbl.c
@@ -32,6 +32,7 @@
 #include "main/imports.h"
 #include "main/macros.h"
 #include "main/colormac.h"
+#include "main/texformat.h"
 
 #include "tnl/t_context.h"
 #include "tnl/t_vertex.h"
@@ -40,6 +41,7 @@
 #include "intel_tex.h"
 #include "intel_regions.h"
 #include "intel_tris.h"
+#include "intel_fbo.h"
 
 #include "i915_reg.h"
 #include "i915_context.h"
@@ -542,6 +544,8 @@ i915_state_draw_region(struct intel_context *intel,
 {
    struct i915_context *i915 = i915_context(&intel->ctx);
    GLcontext *ctx = &intel->ctx;
+   struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
+   struct intel_renderbuffer *irb = intel_renderbuffer(rb);
    GLuint value;
 
    ASSERT(state == &i915->state || state == &i915->meta);
@@ -580,12 +584,26 @@ i915_state_draw_region(struct intel_context *intel,
    value = (DSTORG_HORT_BIAS(0x8) |     /* .5 */
             DSTORG_VERT_BIAS(0x8) |     /* .5 */
             LOD_PRECLAMP_OGL | TEX_DEFAULT_COLOR_OGL);
-   if (color_region && color_region->cpp == 4) {
-      value |= DV_PF_8888;
-   }
-   else {
-      value |= (DITHER_FULL_ALWAYS | DV_PF_565);
+   if (irb != NULL) {
+      switch (irb->texformat->MesaFormat) {
+      case MESA_FORMAT_ARGB8888:
+	 value |= DV_PF_8888;
+	 break;
+      case MESA_FORMAT_RGB565:
+	 value |= DV_PF_565 | DITHER_FULL_ALWAYS;
+	 break;
+      case MESA_FORMAT_ARGB1555:
+	 value |= DV_PF_1555 | DITHER_FULL_ALWAYS;
+	 break;
+      case MESA_FORMAT_ARGB4444:
+	 value |= DV_PF_4444 | DITHER_FULL_ALWAYS;
+	 break;
+      default:
+	 _mesa_problem(ctx, "Bad renderbuffer format: %d\n",
+		       irb->texformat->MesaFormat);
+      }
    }
+
    if (depth_region && depth_region->cpp == 4) {
       value |= DEPTH_FRMT_24_FIXED_8_OTHER;
    }
diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index ce5dbb334b..0dc377be65 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -38,7 +38,7 @@
 #include "intel_mipmap_tree.h"
 #include "intel_batchbuffer.h"
 #include "intel_tex.h"
-
+#include "intel_fbo.h"
 
 #include "brw_context.h"
 #include "brw_state.h"
@@ -505,15 +505,18 @@ brw_update_vs_constant_surface( GLcontext *ctx,
  * usable for further buffers when doing ARB_draw_buffer support.
  */
 static void
-brw_update_region_surface(struct brw_context *brw, struct intel_region *region,
-			  unsigned int unit, GLboolean cached)
+brw_update_renderbuffer_surface(struct brw_context *brw,
+				struct gl_renderbuffer *rb,
+				unsigned int unit, GLboolean cached)
 {
    GLcontext *ctx = &brw->intel.ctx;
    dri_bo *region_bo = NULL;
+   struct intel_renderbuffer *irb = intel_renderbuffer(rb);
+   struct intel_region *region = irb ? irb->region : NULL;
    struct {
       unsigned int surface_type;
       unsigned int surface_format;
-      unsigned int width, height, cpp;
+      unsigned int width, height, pitch, cpp;
       GLubyte color_mask[4];
       GLboolean color_blend;
       uint32_t tiling;
@@ -525,13 +528,27 @@ brw_update_region_surface(struct brw_context *brw, struct intel_region *region,
       region_bo = region->buffer;
 
       key.surface_type = BRW_SURFACE_2D;
-      if (region->cpp == 4)
+      switch (irb->texformat->MesaFormat) {
+      case MESA_FORMAT_ARGB8888:
 	 key.surface_format = BRW_SURFACEFORMAT_B8G8R8A8_UNORM;
-      else
+	 break;
+      case MESA_FORMAT_RGB565:
 	 key.surface_format = BRW_SURFACEFORMAT_B5G6R5_UNORM;
+	 break;
+      case MESA_FORMAT_ARGB1555:
+	 key.surface_format = BRW_SURFACEFORMAT_B5G5R5A1_UNORM;
+	 break;
+      case MESA_FORMAT_ARGB4444:
+	 key.surface_format = BRW_SURFACEFORMAT_B4G4R4A4_UNORM;
+	 break;
+      default:
+	 _mesa_problem(ctx, "Bad renderbuffer format: %d\n",
+		       irb->texformat->MesaFormat);
+      }
       key.tiling = region->tiling;
-      key.width = region->pitch; /* XXX: not really! */
-      key.height = region->height;
+      key.width = rb->Width;
+      key.height = rb->Height;
+      key.pitch = region->pitch;
       key.cpp = region->cpp;
    } else {
       key.surface_type = BRW_SURFACE_NULL;
@@ -567,7 +584,7 @@ brw_update_region_surface(struct brw_context *brw, struct intel_region *region,
       surf.ss2.width = key.width - 1;
       surf.ss2.height = key.height - 1;
       brw_set_surface_tiling(&surf, key.tiling);
-      surf.ss3.pitch = (key.width * key.cpp) - 1;
+      surf.ss3.pitch = (key.pitch * key.cpp) - 1;
 
       /* _NEW_COLOR */
       surf.ss0.color_blend = key.color_blend;
@@ -655,14 +672,17 @@ static void prepare_wm_surfaces(struct brw_context *brw )
    GLuint i;
    int old_nr_surfaces;
 
+   /* _NEW_BUFFERS */
    /* Update surfaces for drawing buffers */
-   if (brw->state.nr_color_regions > 1) {
-      for (i = 0; i < brw->state.nr_color_regions; i++) {
-         brw_update_region_surface(brw, brw->state.color_regions[i], i,
-				   GL_FALSE);
+   if (ctx->DrawBuffer->_NumColorDrawBuffers >= 1) {
+      for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
+         brw_update_renderbuffer_surface(brw,
+					 ctx->DrawBuffer->_ColorDrawBuffers[i],
+					 i,
+					 GL_FALSE);
       }
    } else {
-      brw_update_region_surface(brw, brw->state.color_regions[0], 0, GL_TRUE);
+      brw_update_renderbuffer_surface(brw, NULL, 0, GL_TRUE);
    }
 
    old_nr_surfaces = brw->wm.nr_surfaces;
diff --git a/src/mesa/drivers/dri/intel/intel_blit.c b/src/mesa/drivers/dri/intel/intel_blit.c
index 4ae9b118a3..4919828131 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 bd3810549a..d798225ddd 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 a401f730ba..52647ddf8b 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 7226ee026f..f0665af482 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 c3a873f1ab..34b78ebc1a 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;
    }
 }