i965: Set up inputs to the fragment shader according to FP InputsRead.

Sending down data that doesn't get read doesn't make any sense, and
would make handling things like gl_FrontFacing and gl_PointCoord
harder.

3 files changed, 50 insertions, 30 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_wm_glsl.c b/src/mesa/drivers/dri/i965/brw_wm_glsl.c
index a0f299195c..f60245377e 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_glsl.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_glsl.c
@@ -347,26 +347,42 @@ static void prealloc_reg(struct brw_wm_compile *c)
         }
     }
 
-    /* fragment shader inputs */
-    for (i = 0; i < VERT_RESULT_MAX; i++) {
-       int fp_input;
-
-       if (i >= VERT_RESULT_VAR0)
-	  fp_input = i - VERT_RESULT_VAR0 + FRAG_ATTRIB_VAR0;
-       else if (i <= VERT_RESULT_TEX7)
-	  fp_input = i;
-       else
-	  fp_input = -1;
+    /* fragment shader inputs: One 2-reg pair of interpolation
+     * coefficients for each vec4 to be set up.
+     */
+    if (intel->gen >= 6) {
+       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
+	  if (!(c->fp->program.Base.InputsRead & BITFIELD64_BIT(i)))
+	     continue;
 
-       if (fp_input >= 0 && inputs & (1 << fp_input)) {
-	  urb_read_length = reg_index;
 	  reg = brw_vec8_grf(reg_index, 0);
-	  for (j = 0; j < 4; j++)
-	     set_reg(c, PROGRAM_PAYLOAD, fp_input, j, reg);
-       }
-       if (c->key.vp_outputs_written & BITFIELD64_BIT(i)) {
+	  for (j = 0; j < 4; j++) {
+	     set_reg(c, PROGRAM_PAYLOAD, i, j, reg);
+	  }
 	  reg_index += 2;
        }
+       urb_read_length = reg_index;
+    } else {
+       for (i = 0; i < VERT_RESULT_MAX; i++) {
+	  int fp_input;
+
+	  if (i >= VERT_RESULT_VAR0)
+	     fp_input = i - VERT_RESULT_VAR0 + FRAG_ATTRIB_VAR0;
+	  else if (i <= VERT_RESULT_TEX7)
+	     fp_input = i;
+	  else
+	     fp_input = -1;
+
+	  if (fp_input >= 0 && inputs & (1 << fp_input)) {
+	     urb_read_length = reg_index;
+	     reg = brw_vec8_grf(reg_index, 0);
+	     for (j = 0; j < 4; j++)
+		set_reg(c, PROGRAM_PAYLOAD, fp_input, j, reg);
+	  }
+	  if (c->key.vp_outputs_written & BITFIELD64_BIT(i)) {
+	     reg_index += 2;
+	  }
+       }
     }
 
     c->prog_data.first_curbe_grf = c->key.nr_payload_regs;
diff --git a/src/mesa/drivers/dri/i965/gen6_sf_state.c b/src/mesa/drivers/dri/i965/gen6_sf_state.c
index 6820ca3abf..b5984255af 100644
--- a/src/mesa/drivers/dri/i965/gen6_sf_state.c
+++ b/src/mesa/drivers/dri/i965/gen6_sf_state.c
@@ -33,20 +33,29 @@
 #include "intel_batchbuffer.h"
 
 static uint32_t
-get_attr_override(struct brw_context *brw, int attr)
+get_attr_override(struct brw_context *brw, int fs_attr)
 {
-   uint32_t attr_override;
-   int attr_index = 0, i;
+   int attr_index = 0, i, vs_attr;
+
+   if (fs_attr <= FRAG_ATTRIB_TEX7)
+      vs_attr = fs_attr;
+   else if (fs_attr == FRAG_ATTRIB_FACE)
+      vs_attr = 0; /* XXX */
+   else if (fs_attr == FRAG_ATTRIB_PNTC)
+      vs_attr = 0; /* XXX */
+   else {
+      assert(fs_attr >= FRAG_ATTRIB_VAR0);
+      vs_attr = fs_attr - FRAG_ATTRIB_VAR0 + VERT_RESULT_VAR0;
+   }
 
    /* Find the source index (0 = first attribute after the 4D position)
     * for this output attribute.  attr is currently a VERT_RESULT_* but should
     * be FRAG_ATTRIB_*.
     */
-   for (i = 0; i < attr; i++) {
+   for (i = 0; i < vs_attr; i++) {
       if (brw->vs.prog_data->outputs_written & BITFIELD64_BIT(i))
 	 attr_index++;
    }
-   attr_override = attr_index;
 
    return attr_index;
 }
@@ -58,8 +67,7 @@ upload_sf_state(struct brw_context *brw)
    GLcontext *ctx = &intel->ctx;
    /* CACHE_NEW_VS_PROG */
    uint32_t num_inputs = brw_count_bits(brw->vs.prog_data->outputs_written);
-   /* This should probably be FS inputs read */
-   uint32_t num_outputs = brw_count_bits(brw->vs.prog_data->outputs_written);
+   uint32_t num_outputs = brw_count_bits(brw->fragment_program->Base.InputsRead);
    uint32_t dw1, dw2, dw3, dw4;
    int i;
    /* _NEW_BUFFER */
@@ -144,11 +152,8 @@ upload_sf_state(struct brw_context *brw)
    for (i = 0; i < 8; i++) {
       uint32_t attr_overrides = 0;
 
-      /* These should be generating FS inputs read instead of VS
-       * outputs written
-       */
       for (; attr < 64; attr++) {
-	 if (brw->vs.prog_data->outputs_written & BITFIELD64_BIT(attr)) {
+	 if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)) {
 	    attr_overrides |= get_attr_override(brw, attr);
 	    attr++;
 	    break;
@@ -156,7 +161,7 @@ upload_sf_state(struct brw_context *brw)
       }
 
       for (; attr < 64; attr++) {
-	 if (brw->vs.prog_data->outputs_written & BITFIELD64_BIT(attr)) {
+	 if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)) {
 	    attr_overrides |= get_attr_override(brw, attr) << 16;
 	    attr++;
 	    break;
diff --git a/src/mesa/drivers/dri/i965/gen6_wm_state.c b/src/mesa/drivers/dri/i965/gen6_wm_state.c
index afce1da666..d88c86a1b2 100644
--- a/src/mesa/drivers/dri/i965/gen6_wm_state.c
+++ b/src/mesa/drivers/dri/i965/gen6_wm_state.c
@@ -153,8 +153,7 @@ upload_wm_state(struct brw_context *brw)
 
    dw6 |= GEN6_WM_PERSPECTIVE_PIXEL_BARYCENTRIC;
 
-   /* This should probably be FS inputs read */
-   dw6 |= brw_count_bits(brw->vs.prog_data->outputs_written) <<
+   dw6 |= brw_count_bits(brw->fragment_program->Base.InputsRead) <<
       GEN6_WM_NUM_SF_OUTPUTS_SHIFT;
 
    BEGIN_BATCH(9);