medfall

commit 053b37bf1a9396e853105b33e69120fba332d715
parent 6fc8931245a0a9f1361a2f16df0ddd73e4c4939c
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Thu Aug 31 22:44:59 +0300

Map UBO with INVALIDATE_BUFFER/UNSYNCHRONIZED to avoid stalls entirely

Diffstat:
renderer.cc
 | 
6
+++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/renderer.cc b/renderer.cc
@@ -102,6 +102,7 @@ static void bind_fb( FB fb ) {
 void renderer_init() {
 	glGenBuffers( 1, &uniforms );
 	glBindBuffer( GL_UNIFORM_BUFFER, uniforms );
+	glBufferData( GL_UNIFORM_BUFFER, UNIFORM_BUFFER_SIZE, NULL, GL_DYNAMIC_DRAW );
 
 	in_frame = false;
 	in_pass = false;
@@ -123,8 +124,8 @@ void renderer_begin_frame() {
 	deletes.clear();
 	render_passes.clear();
 
-	glBufferData( GL_UNIFORM_BUFFER, UNIFORM_BUFFER_SIZE, NULL, GL_DYNAMIC_DRAW );
-	uniforms_buffer = ( u8 * ) glMapBuffer( GL_UNIFORM_BUFFER, GL_WRITE_ONLY );
+	GLbitfield bits = GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT | GL_MAP_UNSYNCHRONIZED_BIT;
+	uniforms_buffer = ( u8 * ) glMapBufferRange( GL_UNIFORM_BUFFER, 0, UNIFORM_BUFFER_SIZE, bits );
 	ASSERT( uniforms_buffer != NULL );
 	uniforms_offset = 0;
 }
@@ -137,7 +138,6 @@ void renderer_end_frame() {
 	ASSERT( in_frame );
 	in_frame = false;
 
-	glBindBuffer( GL_UNIFORM_BUFFER, uniforms ); // TODO: not necessary
 	glUnmapBuffer( GL_UNIFORM_BUFFER );
 	uniforms_buffer = NULL;