mesa: Use correct data for MAX_{VERTEX,GEOMETRY}_VARYING_COMPONENTS_ARB queries

Previously gl_constants::MaxVaryingComponents was used.  Now
gl_constants::VertexProgram::MaxOutputs and
gl_constants::GeometryProgram::MaxOutputs are used.

This means that st_extensions.c had to be updated to set these fields
instead of MaxVaryingComponents.  It was previously the only place that
set MaxVaryingComponents.

I believe that the structure is allocated by calloc, so the value should
be initialized to zero in non-Gallium drivers before and after my
change.  Right now nobody enables GL_ARB_geometry_shader4, so it's
pretty much dead code anyway.
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
Cc: Zack Rusin <zackr@vmware.com>

src/mesa/main/get_hash_params.py

@@ -651,8 +651,8 @@ descriptor=[
   [ "MAX_GEOMETRY_OUTPUT_VERTICES_ARB", "CONTEXT_INT(Const.MaxGeometryOutputVertices), extra_ARB_geometry_shader4" ],
   [ "MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS_ARB", "CONTEXT_INT(Const.MaxGeometryTotalOutputComponents), extra_ARB_geometry_shader4" ],
   [ "MAX_GEOMETRY_UNIFORM_COMPONENTS_ARB", "CONTEXT_INT(Const.GeometryProgram.MaxUniformComponents), extra_ARB_geometry_shader4" ],
-  [ "MAX_GEOMETRY_VARYING_COMPONENTS_ARB", "CONTEXT_INT(Const.MaxVaryingComponents), extra_ARB_geometry_shader4" ],
-  [ "MAX_VERTEX_VARYING_COMPONENTS_ARB", "CONTEXT_INT(Const.MaxVaryingComponents), extra_ARB_geometry_shader4" ],
+  [ "MAX_GEOMETRY_VARYING_COMPONENTS_ARB", "CONTEXT_INT(Const.GeometryProgram.MaxOutputComponents), extra_ARB_geometry_shader4" ],
+  [ "MAX_VERTEX_VARYING_COMPONENTS_ARB", "CONTEXT_INT(Const.VertexProgram.MaxOutputComponents), extra_ARB_geometry_shader4" ],
 
 # GL_ARB_color_buffer_float
   [ "RGBA_FLOAT_MODE_ARB", "BUFFER_FIELD(Visual.floatMode, TYPE_BOOLEAN), extra_core_ARB_color_buffer_float_and_new_buffers" ],

src/mesa/state_tracker/st_extensions.c

@@ -256,7 +256,10 @@ void st_init_limits(struct st_context *st)
    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
                                             PIPE_SHADER_CAP_MAX_INPUTS);
    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
-   c->MaxVaryingComponents = c->MaxVarying * 4;
+   c->FragmentProgram.MaxInputComponents = c->MaxVarying * 4;
+   c->VertexProgram.MaxOutputComponents = c->MaxVarying * 4;
+   c->GeometryProgram.MaxInputComponents = c->MaxVarying * 4;
+   c->GeometryProgram.MaxOutputComponents = c->MaxVarying * 4;
 
    c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
    c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);