mesa: support for GL_ARB_instanced_arrays

1 files changed, 39 insertions, 3 deletions

diff --git a/src/mesa/main/varray.c b/src/mesa/main/varray.c
index bcde65adc70..29d8a8827e3 100644
--- a/src/mesa/main/varray.c
+++ b/src/mesa/main/varray.c
@@ -534,11 +534,19 @@ get_vertex_array_attrib(struct gl_context *ctx, GLuint index, GLenum pname,
       if (ctx->Extensions.EXT_gpu_shader4) {
          return array->Integer;
       }
-      /* fall-through */
+      goto error;
+   case GL_VERTEX_ATTRIB_ARRAY_DIVISOR_ARB:
+      if (ctx->Extensions.ARB_instanced_arrays) {
+         return array->InstanceDivisor;
+      }
+      goto error;
    default:
-      _mesa_error(ctx, GL_INVALID_ENUM, "%s(pname=0x%x)", caller, pname);
-      return 0;
+      ; /* fall-through */
    }
+
+error:
+   _mesa_error(ctx, GL_INVALID_ENUM, "%s(pname=0x%x)", caller, pname);
+   return 0;
 }
 
 
@@ -1066,6 +1074,33 @@ _mesa_PrimitiveRestartIndex(GLuint index)
 
 
 /**
+ * See GL_ARB_instanced_arrays.
+ * Note that the instance divisor only applies to generic arrays, not
+ * the legacy vertex arrays.
+ */
+void GLAPIENTRY
+_mesa_VertexAttribDivisor(GLuint index, GLuint divisor)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+   if (!ctx->Extensions.ARB_instanced_arrays) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glVertexAttribDivisor()");
+      return;
+   }
+
+   if (index >= ctx->Const.VertexProgram.MaxAttribs) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glVertexAttribDivisor(index = %u)",
+                  index);
+      return;
+   }
+
+   ctx->Array.ArrayObj->VertexAttrib[index].InstanceDivisor = divisor;
+}
+
+
+
+/**
  * Copy one client vertex array to another.
  */
 void
@@ -1082,6 +1117,7 @@ _mesa_copy_client_array(struct gl_context *ctx,
    dst->Enabled = src->Enabled;
    dst->Normalized = src->Normalized;
    dst->Integer = src->Integer;
+   dst->InstanceDivisor = src->InstanceDivisor;
    dst->_ElementSize = src->_ElementSize;
    _mesa_reference_buffer_object(ctx, &dst->BufferObj, src->BufferObj);
    dst->_MaxElement = src->_MaxElement;