1 files changed, 55 insertions, 15 deletions

diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index 02901a7ed94..11457723b09 100644
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -37,7 +37,7 @@
 #include "imports.h"
 
 #include "s_atifragshader.h"
-#include "s_alpha.h"

+#include "s_alpha.h"
 #include "s_arbshader.h"
 #include "s_blend.h"
 #include "s_context.h"
@@ -434,7 +434,8 @@ interpolate_texcoords(GLcontext *ctx, struct sw_span *span)
                GLfloat r = span->tex[u][2];
                GLfloat q = span->tex[u][3];
                GLuint i;
-               if (ctx->FragmentProgram._Active || ctx->ATIFragmentShader._Enabled) {
+               if (ctx->FragmentProgram._Active || ctx->ATIFragmentShader._Enabled ||
+                   ctx->ShaderObjects._FragmentShaderPresent) {
                   /* do perspective correction but don't divide s, t, r by q */
                   const GLfloat dwdx = span->dwdx;
                   GLfloat w = span->w;
@@ -485,7 +486,8 @@ interpolate_texcoords(GLcontext *ctx, struct sw_span *span)
                GLfloat r = span->tex[u][2];
                GLfloat q = span->tex[u][3];
                GLuint i;
-               if (ctx->FragmentProgram._Active || ctx->ATIFragmentShader._Enabled) {
+               if (ctx->FragmentProgram._Active || ctx->ATIFragmentShader._Enabled ||
+                   ctx->ShaderObjects._FragmentShaderPresent) {
                   /* do perspective correction but don't divide s, t, r by q */
                   const GLfloat dwdx = span->dwdx;
                   GLfloat w = span->w;
@@ -568,7 +570,8 @@ interpolate_texcoords(GLcontext *ctx, struct sw_span *span)
          GLfloat r = span->tex[0][2];
          GLfloat q = span->tex[0][3];
          GLuint i;
-         if (ctx->FragmentProgram._Active || ctx->ATIFragmentShader._Enabled) {
+         if (ctx->FragmentProgram._Active || ctx->ATIFragmentShader._Enabled ||
+             ctx->ShaderObjects._FragmentShaderPresent) {
             /* do perspective correction but don't divide s, t, r by q */
             const GLfloat dwdx = span->dwdx;
             GLfloat w = span->w;
@@ -619,7 +622,8 @@ interpolate_texcoords(GLcontext *ctx, struct sw_span *span)
          GLfloat r = span->tex[0][2];
          GLfloat q = span->tex[0][3];
          GLuint i;
-         if (ctx->FragmentProgram._Active || ctx->ATIFragmentShader._Enabled) {
+         if (ctx->FragmentProgram._Active || ctx->ATIFragmentShader._Enabled ||
+             ctx->ShaderObjects._FragmentShaderPresent) {
             /* do perspective correction but don't divide s, t, r by q */
             const GLfloat dwdx = span->dwdx;
             GLfloat w = span->w;
@@ -668,6 +672,38 @@ interpolate_texcoords(GLcontext *ctx, struct sw_span *span)
 
 
 /**
+ * Fill in the span.varying array from the interpolation values.
+ */
+static void
+interpolate_varying(GLcontext *ctx, struct sw_span *span)
+{
+   GLuint i, j;
+
+   ASSERT(span->interpMask & SPAN_VARYING);
+   ASSERT(!(span->arrayMask & SPAN_VARYING));
+
+   span->arrayMask |= SPAN_VARYING;
+
+   for (i = 0; i < MAX_VARYING_VECTORS; i++) {
+      for (j = 0; j < VARYINGS_PER_VECTOR; j++) {
+         const GLfloat dvdx = span->varStepX[i][j];
+         GLfloat v = span->var[i][j];
+         const GLfloat dwdx = span->dwdx;
+         GLfloat w = span->w;
+         GLuint k;
+
+         for (k = 0; k < span->end; k++) {
+            GLfloat invW = 1.0f / w;
+            span->array->varying[k][i][j] = v * invW;
+            v += dvdx;
+            w += dwdx;
+         }
+      }
+   }
+}
+
+
+/**
  * Apply the current polygon stipple pattern to a span of pixels.
  */
 static void
@@ -1139,6 +1175,10 @@ _swrast_write_rgba_span( GLcontext *ctx, struct sw_span *span)
       interpolate_texcoords(ctx, span);
    }
 
+   if (ctx->ShaderObjects._FragmentShaderPresent) {
+      interpolate_varying(ctx, span);
+   }
+
    /* This is the normal place to compute the resulting fragment color/Z.
     * As an optimization, we try to defer this until after Z/stencil
     * testing in order to try to avoid computing colors that we won't
@@ -1155,11 +1195,11 @@ _swrast_write_rgba_span( GLcontext *ctx, struct sw_span *span)
       if (span->interpMask & SPAN_FOG)
          interpolate_fog(ctx, span);
 
-      /* Compute fragment colors with fragment program or texture lookups */

-      if (ctx->ShaderObjects._FragmentShaderPresent) {

-         if (span->interpMask & SPAN_Z)

-            _swrast_span_interpolate_z (ctx, span);

-         _swrast_exec_arbshader (ctx, span);

+      /* Compute fragment colors with fragment program or texture lookups */
+      if (ctx->ShaderObjects._FragmentShaderPresent) {
+         if (span->interpMask & SPAN_Z)
+            _swrast_span_interpolate_z (ctx, span);
+         _swrast_exec_arbshader (ctx, span);
       }
       else if (ctx->FragmentProgram._Active) {
          /* frag prog may need Z values */
@@ -1240,11 +1280,11 @@ _swrast_write_rgba_span( GLcontext *ctx, struct sw_span *span)
       if (span->interpMask & SPAN_FOG)
          interpolate_fog(ctx, span);
 
-      if (ctx->ShaderObjects._FragmentShaderPresent) {

-         if (span->interpMask & SPAN_Z)

-            _swrast_span_interpolate_z (ctx, span);

-         _swrast_exec_arbshader (ctx, span);

-      }

+      if (ctx->ShaderObjects._FragmentShaderPresent) {
+         if (span->interpMask & SPAN_Z)
+            _swrast_span_interpolate_z (ctx, span);
+         _swrast_exec_arbshader (ctx, span);
+      }
       else if (ctx->FragmentProgram._Active)
          _swrast_exec_fragment_program( ctx, span );
       else if (ctx->ATIFragmentShader._Enabled)