glsl: Store info about geometry shaders that emit vertices to non-zero streams.

On Intel hardware when a geometry shader outputs GL_POINTS primitives we
only need to emit vertex control bits if it emits vertices to non-zero
streams, so use a flag to track this.

This flag will be set to TRUE when a geometry shader calls EmitStreamVertex()
or EndStreamPrimitive() with a non-zero stream parameter in a later patch.

Reviewed-by: Ian Romanick <[email protected]>

3 files changed, 4 insertions, 0 deletions

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 5b110a7cdbf..3b472b0a1db 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2178,6 +2178,7 @@ struct gl_geometry_program
                            GL_TRIANGLES, or GL_TRIANGLES_ADJACENCY_ARB */
    GLenum OutputType; /**< GL_POINTS, GL_LINE_STRIP or GL_TRIANGLE_STRIP */
    bool UsesEndPrimitive;
+   bool UsesStreams;
 };
 
 
@@ -2681,6 +2682,7 @@ struct gl_shader_program
       GLuint ClipDistanceArraySize; /**< Size of the gl_ClipDistance array, or
                                          0 if not present. */
       bool UsesEndPrimitive;
+      bool UsesStreams;
    } Geom;
 
    /** Vertex shader state */
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index 2ec2444daa2..2bbef35d363 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -1888,6 +1888,7 @@ _mesa_copy_linked_program_data(gl_shader_stage type,
       dst_gp->OutputType = src->Geom.OutputType;
       dst->UsesClipDistanceOut = src->Geom.UsesClipDistance;
       dst_gp->UsesEndPrimitive = src->Geom.UsesEndPrimitive;
+      dst_gp->UsesStreams = src->Geom.UsesStreams;
    }
       break;
    case MESA_SHADER_FRAGMENT: {
diff --git a/src/mesa/main/shaderobj.c b/src/mesa/main/shaderobj.c
index c6e852c876c..b9feff4a404 100644
--- a/src/mesa/main/shaderobj.c
+++ b/src/mesa/main/shaderobj.c
@@ -249,6 +249,7 @@ _mesa_init_shader_program(struct gl_context *ctx, struct gl_shader_program *prog
    prog->Geom.InputType = GL_TRIANGLES;
    prog->Geom.OutputType = GL_TRIANGLE_STRIP;
    prog->Geom.UsesEndPrimitive = false;
+   prog->Geom.UsesStreams = false;
 
    prog->TransformFeedback.BufferMode = GL_INTERLEAVED_ATTRIBS;