From 32340aea1308153dad5c105fc0748aea1e4c37ee Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Mon, 24 Oct 2005 19:28:36 +0000
Subject: fragment program writing to result.depth.z was broken

---
 src/mesa/swrast/s_nvfragprog.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'src/mesa/swrast/s_nvfragprog.c')

diff --git a/src/mesa/swrast/s_nvfragprog.c b/src/mesa/swrast/s_nvfragprog.c
index 441d1e8ca7..987163389a 100644
--- a/src/mesa/swrast/s_nvfragprog.c
+++ b/src/mesa/swrast/s_nvfragprog.c
@@ -1390,6 +1390,7 @@ init_machine( GLcontext *ctx, struct fp_machine *machine,
    /* Load input registers */
    if (inputsRead & (1 << FRAG_ATTRIB_WPOS)) {
       GLfloat *wpos = machine->Inputs[FRAG_ATTRIB_WPOS];
+      ASSERT(span->arrayMask & SPAN_Z);
       wpos[0] = (GLfloat) span->x + col;
       wpos[1] = (GLfloat) span->y;
       wpos[2] = (GLfloat) span->array->z[col] / ctx->DrawBuffer->_DepthMaxF;
@@ -1397,6 +1398,7 @@ init_machine( GLcontext *ctx, struct fp_machine *machine,
    }
    if (inputsRead & (1 << FRAG_ATTRIB_COL0)) {
       GLfloat *col0 = machine->Inputs[FRAG_ATTRIB_COL0];
+      ASSERT(span->arrayMask & SPAN_RGBA);
       col0[0] = CHAN_TO_FLOAT(span->array->rgba[col][RCOMP]);
       col0[1] = CHAN_TO_FLOAT(span->array->rgba[col][GCOMP]);
       col0[2] = CHAN_TO_FLOAT(span->array->rgba[col][BCOMP]);
@@ -1411,6 +1413,7 @@ init_machine( GLcontext *ctx, struct fp_machine *machine,
    }
    if (inputsRead & (1 << FRAG_ATTRIB_FOGC)) {
       GLfloat *fogc = machine->Inputs[FRAG_ATTRIB_FOGC];
+      ASSERT(span->arrayMask & SPAN_FOG);
       fogc[0] = span->array->fog[col];
       fogc[1] = 0.0F;
       fogc[2] = 0.0F;
@@ -1479,11 +1482,19 @@ _swrast_exec_fragment_program( GLcontext *ctx, struct sw_span *span )
             UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][ACOMP], colOut[3]);
          }
          /* depth value */
-         if (program->OutputsWritten & (1 << FRAG_OUTPUT_DEPR))
-            span->array->z[i] = IROUND(ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_DEPR][0] * ctx->DrawBuffer->_DepthMaxF);
+         if (program->OutputsWritten & (1 << FRAG_OUTPUT_DEPR)) {
+            const GLfloat depth
+               = ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_DEPR][2];
+            span->array->z[i] = IROUND(depth * ctx->DrawBuffer->_DepthMaxF);
+         }
       }
    }
 
+   if (program->OutputsWritten & (1 << FRAG_OUTPUT_DEPR)) {
+      span->interpMask &= ~SPAN_Z;
+      span->arrayMask |= SPAN_Z;
+   }
+
    ctx->_CurrentProgram = 0;
 }
 
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