medfall

commit e6789fad605b89775038314ea35828f43a39f6ee
parent 92c62510e7171936e378388024fd176fcdd90776
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Sat Nov  5 12:42:40 +0200

Allow creation of empty VB/IBs

Diffstat:
renderer.cc
 | 
14
++++++++++----
renderer.h
 | 
4
++--
2 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/renderer.cc b/renderer.cc
@@ -66,8 +66,11 @@ static GLenum bufferusage_to_glenum( BufferUsage usage ) {
 VB renderer_new_vb( const void * data, size_t len, BufferUsage usage ) {
 	GLuint vbo;
 	glGenBuffers( 1, &vbo );
-	glBindBuffer( GL_ARRAY_BUFFER, vbo );
-	glBufferData( GL_ARRAY_BUFFER, len, data, bufferusage_to_glenum( usage ) );
+
+	if( data != NULL ) {
+		glBindBuffer( GL_ARRAY_BUFFER, vbo );
+		glBufferData( GL_ARRAY_BUFFER, len, data, bufferusage_to_glenum( usage ) );
+	}
 
 	return checked_cast< VB >( vbo );
 }
@@ -75,8 +78,11 @@ VB renderer_new_vb( const void * data, size_t len, BufferUsage usage ) {
 IB renderer_new_ib( const void * data, size_t len, BufferUsage usage ) {
 	GLuint ebo;
 	glGenBuffers( 1, &ebo );
-	glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, ebo );
-	glBufferData( GL_ELEMENT_ARRAY_BUFFER, len, data, bufferusage_to_glenum( usage ) );
+
+	if( data != NULL ) {
+		glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, ebo );
+		glBufferData( GL_ELEMENT_ARRAY_BUFFER, len, data, bufferusage_to_glenum( usage ) );
+	}
 
 	return checked_cast< IB >( ebo );
 }
diff --git a/renderer.h b/renderer.h
@@ -107,8 +107,8 @@ enum ClearDepthBool { CLEARDEPTH_DONT, CLEARDEPTH_DO };
 
 void renderer_begin_frame( ClearColourBool clear_colour = CLEARCOLOUR_DO, ClearDepthBool clear_depth = CLEARDEPTH_DO );
 
-VB renderer_new_vb( const void * data, size_t len, BufferUsage usage = BUFFERUSAGE_STATIC ); // specify type/layout
-IB renderer_new_ib( const void * data, size_t len, BufferUsage usage = BUFFERUSAGE_STATIC ); // specify u16/u32
+VB renderer_new_vb( const void * data = NULL, size_t len = 0, BufferUsage usage = BUFFERUSAGE_STATIC );
+IB renderer_new_ib( const void * data = NULL, size_t len = 0, BufferUsage usage = BUFFERUSAGE_STATIC );
 UB renderer_new_ub( const void * data = NULL, size_t len = 0 );
 
 void renderer_delete_vb( VB vb );