mesa: glGetProgramInterfaceiv

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

v2: code cleanup (Ilia Mirkin)
    fix array size fo xfb varyings
    validate programInterface and throw error

v3: put GL_MAX_NUM_COMPATIBLE_SUBROUTINES where
    it belongs

corresponding Piglit test:
   arb_program_interface_query-getprograminterfaceiv

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

1 files changed, 119 insertions, 0 deletions

diff --git a/src/mesa/main/program_resource.c b/src/mesa/main/program_resource.c
index b3b93aa..ae28a26 100644
--- a/src/mesa/main/program_resource.c
+++ b/src/mesa/main/program_resource.c
@@ -23,12 +23,131 @@
  *
  */
 
+#include "main/enums.h"
+#include "main/macros.h"
+#include "main/mtypes.h"
+#include "main/shaderapi.h"
+#include "main/shaderobj.h"
 #include "program_resource.h"
 
+static bool
+supported_interface_enum(GLenum iface)
+{
+   switch (iface) {
+   case GL_UNIFORM:
+   case GL_UNIFORM_BLOCK:
+   case GL_PROGRAM_INPUT:
+   case GL_PROGRAM_OUTPUT:
+   case GL_TRANSFORM_FEEDBACK_VARYING:
+   case GL_ATOMIC_COUNTER_BUFFER:
+      return true;
+   case GL_VERTEX_SUBROUTINE:
+   case GL_TESS_CONTROL_SUBROUTINE:
+   case GL_TESS_EVALUATION_SUBROUTINE:
+   case GL_GEOMETRY_SUBROUTINE:
+   case GL_FRAGMENT_SUBROUTINE:
+   case GL_COMPUTE_SUBROUTINE:
+   case GL_VERTEX_SUBROUTINE_UNIFORM:
+   case GL_TESS_CONTROL_SUBROUTINE_UNIFORM:
+   case GL_TESS_EVALUATION_SUBROUTINE_UNIFORM:
+   case GL_GEOMETRY_SUBROUTINE_UNIFORM:
+   case GL_FRAGMENT_SUBROUTINE_UNIFORM:
+   case GL_COMPUTE_SUBROUTINE_UNIFORM:
+   case GL_BUFFER_VARIABLE:
+   case GL_SHADER_STORAGE_BLOCK:
+   default:
+      return false;
+   }
+}
+
 void GLAPIENTRY
 _mesa_GetProgramInterfaceiv(GLuint program, GLenum programInterface,
                             GLenum pname, GLint *params)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   unsigned i;
+   struct gl_shader_program *shProg =
+      _mesa_lookup_shader_program_err(ctx, program,
+                                      "glGetProgramInterfaceiv");
+   if (!shProg)
+      return;
+
+   if (!params) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glGetProgramInterfaceiv(params NULL)");
+      return;
+   }
+
+   /* Validate interface. */
+   if (!supported_interface_enum(programInterface)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetProgramInterfaceiv(%s)",
+                  _mesa_lookup_enum_by_nr(programInterface));
+      return;
+   }
+
+   /* Validate pname against interface. */
+   switch(pname) {
+   case GL_ACTIVE_RESOURCES:
+      for (i = 0, *params = 0; i < shProg->NumProgramResourceList; i++)
+         if (shProg->ProgramResourceList[i].Type == programInterface)
+            (*params)++;
+      break;
+   case GL_MAX_NAME_LENGTH:
+      if (programInterface == GL_ATOMIC_COUNTER_BUFFER) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glGetProgramInterfaceiv(%s pname %s)",
+                     _mesa_lookup_enum_by_nr(programInterface),
+                     _mesa_lookup_enum_by_nr(pname));
+         return;
+      }
+      /* Name length consists of base name, 3 additional chars '[0]' if
+       * resource is an array and finally 1 char for string terminator.
+       */
+      for (i = 0, *params = 0; i < shProg->NumProgramResourceList; i++) {
+         if (shProg->ProgramResourceList[i].Type != programInterface)
+            continue;
+         const char *name =
+            _mesa_program_resource_name(&shProg->ProgramResourceList[i]);
+         unsigned array_size =
+            _mesa_program_resource_array_size(&shProg->ProgramResourceList[i]);
+         *params = MAX2(*params, strlen(name) + (array_size ? 3 : 0) + 1);
+      }
+      break;
+   case GL_MAX_NUM_ACTIVE_VARIABLES:
+      switch (programInterface) {
+      case GL_UNIFORM_BLOCK:
+         for (i = 0, *params = 0; i < shProg->NumProgramResourceList; i++) {
+            if (shProg->ProgramResourceList[i].Type == programInterface) {
+               struct gl_uniform_block *block =
+                  (struct gl_uniform_block *)
+                  shProg->ProgramResourceList[i].Data;
+               *params = MAX2(*params, block->NumUniforms);
+            }
+         }
+         break;
+      case GL_ATOMIC_COUNTER_BUFFER:
+         for (i = 0, *params = 0; i < shProg->NumProgramResourceList; i++) {
+            if (shProg->ProgramResourceList[i].Type == programInterface) {
+               struct gl_active_atomic_buffer *buffer =
+                  (struct gl_active_atomic_buffer *)
+                  shProg->ProgramResourceList[i].Data;
+               *params = MAX2(*params, buffer->NumUniforms);
+            }
+         }
+         break;
+      default:
+        _mesa_error(ctx, GL_INVALID_OPERATION,
+                    "glGetProgramInterfaceiv(%s pname %s)",
+                    _mesa_lookup_enum_by_nr(programInterface),
+                    _mesa_lookup_enum_by_nr(pname));
+      };
+      break;
+   case GL_MAX_NUM_COMPATIBLE_SUBROUTINES:
+   default:
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glGetProgramInterfaceiv(pname %s)",
+                  _mesa_lookup_enum_by_nr(pname));
+   }
 }
 
 GLuint GLAPIENTRY