enable GL_EXT_fog_coord. Calculate fog factors and submit them instead of fog coords (it seems the chip cannot do fog factor computation when not using fragment depth as fog coord source). vtxfmt uses fallback for now (most code present but some magic would be needed if replaying vertices is necessary later on).

1 files changed, 56 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/r200/r200_maos_arrays.c b/src/mesa/drivers/dri/r200/r200_maos_arrays.c
index 0f8ca3048e..12ea462a40 100644
--- a/src/mesa/drivers/dri/r200/r200_maos_arrays.c
+++ b/src/mesa/drivers/dri/r200/r200_maos_arrays.c
@@ -49,6 +49,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include "r200_state.h"
 #include "r200_swtcl.h"
 #include "r200_maos.h"
+#include "r200_tcl.h"
 
 
 #if 0
@@ -175,7 +176,47 @@ do {						\
 #endif
 
 
+static void emit_vecfog( GLcontext *ctx,
+			 struct r200_dma_region *rvb,
+			 char *data,
+			 int stride,
+			 int count )
+{
+   int i;
+   GLfloat *out;
 
+   r200ContextPtr rmesa = R200_CONTEXT(ctx);
+   
+   if (R200_DEBUG & DEBUG_VERTS)
+      fprintf(stderr, "%s count %d stride %d\n",
+	      __FUNCTION__, count, stride);
+
+   assert (!rvb->buf);
+
+   if (stride == 0) {
+      r200AllocDmaRegion( rmesa, rvb, 4, 4 );
+      count = 1;
+      rvb->aos_start = GET_START(rvb);
+      rvb->aos_stride = 0;
+      rvb->aos_size = 1;
+   }
+   else {
+      r200AllocDmaRegion( rmesa, rvb, count * 4, 4 );	/* alignment? */
+      rvb->aos_start = GET_START(rvb);
+      rvb->aos_stride = 1;
+      rvb->aos_size = 1;
+   }
+
+   /* Emit the data
+    */
+   out = (GLfloat *)(rvb->address + rvb->start);
+   for (i = 0; i < count; i++) {
+      out[0] = r200ComputeFogBlendFactor( ctx, *(GLfloat *)data );
+      out++;
+      data += stride;
+   }
+
+}
 
 
 static void emit_vec4( GLcontext *ctx,
@@ -378,6 +419,18 @@ void r200EmitArrays( GLcontext *ctx, GLuint inputs )
       component[nr++] = &rmesa->tcl.norm;
    }
 
+   if (inputs & VERT_BIT_FOG) {
+      if (!rmesa->tcl.fog.buf)
+	 emit_vecfog( ctx, 
+		      &(rmesa->tcl.fog), 
+		      (char *)VB->FogCoordPtr->data,
+		      VB->FogCoordPtr->stride,
+		      count);
+
+      vfmt0 |= R200_VTX_DISCRETE_FOG;
+      component[nr++] = &rmesa->tcl.fog;
+   }
+ 
    if (inputs & VERT_BIT_COLOR0) {
       int emitsize;
 
@@ -460,6 +513,9 @@ void r200ReleaseArrays( GLcontext *ctx, GLuint newinputs )
 
    if (newinputs & VERT_BIT_NORMAL) 
       r200ReleaseDmaRegion( rmesa, &rmesa->tcl.norm, __FUNCTION__ );
+      
+   if (newinputs & VERT_BIT_FOG) 
+      r200ReleaseDmaRegion( rmesa, &rmesa->tcl.fog, __FUNCTION__ );
 
    if (newinputs & VERT_BIT_COLOR0) 
       r200ReleaseDmaRegion( rmesa, &rmesa->tcl.rgba, __FUNCTION__ );