mesa: implement DrawTransformFeedback from ARB_transform_feedback2

It's like DrawArrays, but the count is taken from a transform feedback
object.

This removes DrawTransformFeedback from dd_function_table and adds the same
function to GLvertexformat (with the function parameters matching GL).

The vbo_draw_func callback has a new parameter
"struct gl_transform_feedback_object *tfb_vertcount".

The rest of the code just validates states and forwards the transform
feedback object into vbo_draw_func.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/mesa/vbo/vbo_save_api.c b/src/mesa/vbo/vbo_save_api.c
index 9d8bada04cf..9521367475e 100644
--- a/src/mesa/vbo/vbo_save_api.c
+++ b/src/mesa/vbo/vbo_save_api.c
@@ -999,6 +999,16 @@ _save_MultiDrawElementsBaseVertex(GLenum mode, const GLsizei *count,
 
 
 static void GLAPIENTRY
+_save_DrawTransformFeedback(GLenum mode, GLuint name)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   (void) mode;
+   (void) name;
+   _mesa_compile_error(ctx, GL_INVALID_OPERATION, "glDrawTransformFeedback");
+}
+
+
+static void GLAPIENTRY
 _save_Rectf(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
 {
    GET_CURRENT_CONTEXT(ctx);
@@ -1347,6 +1357,7 @@ _save_vtxfmt_init(struct gl_context *ctx)
    vfmt->DrawRangeElements = _save_DrawRangeElements;
    vfmt->DrawElementsBaseVertex = _save_DrawElementsBaseVertex;
    vfmt->DrawRangeElementsBaseVertex = _save_DrawRangeElementsBaseVertex;
+   vfmt->DrawTransformFeedback = _save_DrawTransformFeedback;
    vfmt->MultiDrawElementsEXT = _save_MultiDrawElements;
    vfmt->MultiDrawElementsBaseVertex = _save_MultiDrawElementsBaseVertex;
 }