From 67f489ded3a4c575e203dc82368ebe645e72079a Mon Sep 17 00:00:00 2001
From: Marek Olšák <marek.olsak@amd.com>
Date: Sat, 17 Oct 2015 22:50:11 +0200
Subject: mesa: replace UsesClipDistance with ClipDistanceArraySize

This is more practical and needed by gallium.

Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Brian Paul <brianp@vmware.com>
---
 src/glsl/linker.cpp          | 39 ++++++++++++++++++---------------------
 src/glsl/nir/glsl_to_nir.cpp |  3 ++-
 2 files changed, 20 insertions(+), 22 deletions(-)

(limited to 'src/glsl')

diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 25ca928aa43..247052bcf4f 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -651,7 +651,7 @@ link_invalidate_variable_locations(exec_list *ir)
 
 
 /**
- * Set UsesClipDistance and ClipDistanceArraySize based on the given shader.
+ * Set clip_distance_array_size based on the given shader.
  *
  * Also check for errors based on incorrect usage of gl_ClipVertex and
  * gl_ClipDistance.
@@ -660,10 +660,10 @@ link_invalidate_variable_locations(exec_list *ir)
  */
 static void
 analyze_clip_usage(struct gl_shader_program *prog,
-                   struct gl_shader *shader, GLboolean *UsesClipDistance,
-                   GLuint *ClipDistanceArraySize)
+                   struct gl_shader *shader,
+                   GLuint *clip_distance_array_size)
 {
-   *ClipDistanceArraySize = 0;
+   *clip_distance_array_size = 0;
 
    if (!prog->IsES && prog->Version >= 130) {
       /* From section 7.1 (Vertex Shader Special Variables) of the
@@ -686,13 +686,14 @@ analyze_clip_usage(struct gl_shader_program *prog,
                       _mesa_shader_stage_to_string(shader->Stage));
          return;
       }
-      *UsesClipDistance = clip_distance.variable_found();
-      ir_variable *clip_distance_var =
-         shader->symbols->get_variable("gl_ClipDistance");
-      if (clip_distance_var)
-         *ClipDistanceArraySize = clip_distance_var->type->length;
-   } else {
-      *UsesClipDistance = false;
+
+      if (clip_distance.variable_found()) {
+         ir_variable *clip_distance_var =
+               shader->symbols->get_variable("gl_ClipDistance");
+
+         assert(clip_distance_var);
+         *clip_distance_array_size = clip_distance_var->type->length;
+      }
    }
 }
 
@@ -700,8 +701,7 @@ analyze_clip_usage(struct gl_shader_program *prog,
 /**
  * Verify that a vertex shader executable meets all semantic requirements.
  *
- * Also sets prog->Vert.UsesClipDistance and prog->Vert.ClipDistanceArraySize
- * as a side effect.
+ * Also sets prog->Vert.ClipDistanceArraySize as a side effect.
  *
  * \param shader  Vertex shader executable to be verified
  */
@@ -754,8 +754,7 @@ validate_vertex_shader_executable(struct gl_shader_program *prog,
       }
    }
 
-   analyze_clip_usage(prog, shader, &prog->Vert.UsesClipDistance,
-                      &prog->Vert.ClipDistanceArraySize);
+   analyze_clip_usage(prog, shader, &prog->Vert.ClipDistanceArraySize);
 }
 
 void
@@ -765,8 +764,7 @@ validate_tess_eval_shader_executable(struct gl_shader_program *prog,
    if (shader == NULL)
       return;
 
-   analyze_clip_usage(prog, shader, &prog->TessEval.UsesClipDistance,
-                      &prog->TessEval.ClipDistanceArraySize);
+   analyze_clip_usage(prog, shader, &prog->TessEval.ClipDistanceArraySize);
 }
 
 
@@ -797,8 +795,8 @@ validate_fragment_shader_executable(struct gl_shader_program *prog,
 /**
  * Verify that a geometry shader executable meets all semantic requirements
  *
- * Also sets prog->Geom.VerticesIn, prog->Geom.UsesClipDistance, and
- * prog->Geom.ClipDistanceArraySize as a side effect.
+ * Also sets prog->Geom.VerticesIn, and prog->Geom.ClipDistanceArraySize as
+ * a side effect.
  *
  * \param shader Geometry shader executable to be verified
  */
@@ -812,8 +810,7 @@ validate_geometry_shader_executable(struct gl_shader_program *prog,
    unsigned num_vertices = vertices_per_prim(prog->Geom.InputType);
    prog->Geom.VerticesIn = num_vertices;
 
-   analyze_clip_usage(prog, shader, &prog->Geom.UsesClipDistance,
-                      &prog->Geom.ClipDistanceArraySize);
+   analyze_clip_usage(prog, shader, &prog->Geom.ClipDistanceArraySize);
 }
 
 /**
diff --git a/src/glsl/nir/glsl_to_nir.cpp b/src/glsl/nir/glsl_to_nir.cpp
index 76e1382c362..c9cdf35d6db 100644
--- a/src/glsl/nir/glsl_to_nir.cpp
+++ b/src/glsl/nir/glsl_to_nir.cpp
@@ -162,7 +162,8 @@ glsl_to_nir(const struct gl_shader_program *shader_prog,
    shader->info.outputs_written = sh->Program->OutputsWritten;
    shader->info.system_values_read = sh->Program->SystemValuesRead;
    shader->info.uses_texture_gather = sh->Program->UsesGather;
-   shader->info.uses_clip_distance_out = sh->Program->UsesClipDistanceOut;
+   shader->info.uses_clip_distance_out =
+      sh->Program->ClipDistanceArraySize != 0;
    shader->info.separate_shader = shader_prog->SeparateShader;
    shader->info.has_transform_feedback_varyings =
       shader_prog->TransformFeedback.NumVarying > 0;
-- 
cgit v1.2.3