gallium: switch dedicated centroid field to interpolation location

The new location field can be either center, centroid, or sample, which
indicates the location that the shader should interpolate at.

Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>

3 files changed, 13 insertions, 7 deletions

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 9e194313942..f47cd7d5350 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -4848,6 +4848,7 @@ emit_edgeflags(struct st_translate *t)
  * \param inputSemanticIndex  the semantic index (ex: which texcoord) for
  *                            each input
  * \param interpMode  the TGSI_INTERPOLATE_LINEAR/PERSP mode for each input
+ * \param interpLocation the TGSI_INTERPOLATE_LOC_* location for each input
  * \param numOutputs  number of output registers used
  * \param outputMapping  maps Mesa fragment program outputs to TGSI
  *                       generic outputs
@@ -4869,7 +4870,7 @@ st_translate_program(
    const ubyte inputSemanticName[],
    const ubyte inputSemanticIndex[],
    const GLuint interpMode[],
-   const GLboolean is_centroid[],
+   const GLuint interpLocation[],
    GLuint numOutputs,
    const GLuint outputMapping[],
    const ubyte outputSemanticName[],
@@ -4915,7 +4916,7 @@ st_translate_program(
                                                         inputSemanticName[i],
                                                         inputSemanticIndex[i],
                                                         interpMode[i], 0,
-                                                        is_centroid[i]);
+                                                        interpLocation[i]);
       }
 
       if (proginfo->InputsRead & VARYING_BIT_POS) {
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.h b/src/mesa/state_tracker/st_glsl_to_tgsi.h
index a3fe91f7e80..2e7cb78d514 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.h
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.h
@@ -45,7 +45,7 @@ enum pipe_error st_translate_program(
    const ubyte inputSemanticName[],
    const ubyte inputSemanticIndex[],
    const GLuint interpMode[],
-   const GLboolean is_centroid[],
+   const GLuint interpLocation[],
    GLuint numOutputs,
    const GLuint outputMapping[],
    const ubyte outputSemanticName[],
diff --git a/src/mesa/state_tracker/st_program.c b/src/mesa/state_tracker/st_program.c
index 3570557fee6..b603759f8f8 100644
--- a/src/mesa/state_tracker/st_program.c
+++ b/src/mesa/state_tracker/st_program.c
@@ -351,7 +351,7 @@ st_translate_vertex_program(struct st_context *st,
                                    NULL, /* input semantic name */
                                    NULL, /* input semantic index */
                                    NULL, /* interp mode */
-                                   NULL, /* is centroid */
+                                   NULL, /* interp location */
                                    /* outputs */
                                    num_outputs,
                                    stvp->result_to_output,
@@ -481,6 +481,7 @@ st_translate_fragment_program(struct st_context *st,
    GLuint outputMapping[FRAG_RESULT_MAX];
    GLuint inputMapping[VARYING_SLOT_MAX];
    GLuint interpMode[PIPE_MAX_SHADER_INPUTS];  /* XXX size? */
+   GLuint interpLocation[PIPE_MAX_SHADER_INPUTS];
    GLuint attr;
    GLbitfield64 inputsRead;
    struct ureg_program *ureg;
@@ -489,7 +490,6 @@ st_translate_fragment_program(struct st_context *st,
 
    ubyte input_semantic_name[PIPE_MAX_SHADER_INPUTS];
    ubyte input_semantic_index[PIPE_MAX_SHADER_INPUTS];
-   GLboolean is_centroid[PIPE_MAX_SHADER_INPUTS];
    uint fs_num_inputs = 0;
 
    ubyte fs_output_semantic_name[PIPE_MAX_SHADER_OUTPUTS];
@@ -541,7 +541,12 @@ st_translate_fragment_program(struct st_context *st,
          const GLuint slot = fs_num_inputs++;
 
          inputMapping[attr] = slot;
-         is_centroid[slot] = (stfp->Base.IsCentroid & BITFIELD64_BIT(attr)) != 0;
+         if (stfp->Base.IsCentroid & BITFIELD64_BIT(attr))
+            interpLocation[slot] = TGSI_INTERPOLATE_LOC_CENTROID;
+         else if (stfp->Base.IsSample & BITFIELD64_BIT(attr))
+            interpLocation[slot] = TGSI_INTERPOLATE_LOC_SAMPLE;
+         else
+            interpLocation[slot] = TGSI_INTERPOLATE_LOC_CENTER;
 
          switch (attr) {
          case VARYING_SLOT_POS:
@@ -768,7 +773,7 @@ st_translate_fragment_program(struct st_context *st,
                            input_semantic_name,
                            input_semantic_index,
                            interpMode,
-                           is_centroid,
+                           interpLocation,
                            /* outputs */
                            fs_num_outputs,
                            outputMapping,