mesa: implementation of glGetProgramResourceiv

Patch adds required helper functions to shaderapi.h and
the actual implementation.

The property query functionality can be tested with tests for
following functions that are refactored by later patches:

   GetActiveAtomicCounterBufferiv
   GetActiveUniformBlockiv
   GetActiveUniformsiv

v2: code cleanup (Ilia Mirkin)
    add bufSize < 0 check and error out
    fix is_resource_referenced to return bool
    check for propCount and bufSize, fixes in buffer_prop

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Martin Peres <martin.peres@linux.intel.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/mesa/main/program_resource.c b/src/mesa/main/program_resource.c
index 9eb4e2ffd0c..b15a13210c0 100644
--- a/src/mesa/main/program_resource.c
+++ b/src/mesa/main/program_resource.c
@@ -276,6 +276,28 @@ _mesa_GetProgramResourceiv(GLuint program, GLenum programInterface,
                            const GLenum *props, GLsizei bufSize,
                            GLsizei *length, GLint *params)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_shader_program *shProg =
+      _mesa_lookup_shader_program_err(ctx, program, "glGetProgramResourceiv");
+
+   if (!shProg || !params)
+      return;
+
+   /* The error INVALID_VALUE is generated if <propCount> is zero.
+    * Note that we check < 0 here because it makes sense to bail early.
+    */
+   if (propCount <= 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE,
+                  "glGetProgramResourceiv(propCount <= 0)");
+      return;
+   }
+
+   /* No need to write any properties, user requested none. */
+   if (bufSize == 0)
+      return;
+
+   _mesa_get_program_resourceiv(shProg, programInterface, index,
+                                propCount, props, bufSize, length, params);
 }
 
 /**