int opengl_create_texture_buffer_object()
{
if ( GLSL_version < 130 ) {
return -1;
}
// create the buffer
int buffer_object_handle = opengl_create_buffer_object(GL_TEXTURE_BUFFER, GL_DYNAMIC_DRAW);
opengl_check_for_errors();
opengl_buffer_object &buffer_obj = GL_buffer_objects[buffer_object_handle];
// create the texture
glGenTextures(1, &buffer_obj.texture);
glBindTexture(GL_TEXTURE_BUFFER, buffer_obj.texture);
gr_opengl_update_buffer_data(buffer_object_handle, 100, NULL);
glTexBuffer(GL_TEXTURE_BUFFER, GL_RGBA32F, buffer_obj.buffer_id);
opengl_check_for_errors();
return buffer_object_handle;
}
uint opengl_add_to_immediate_buffer(uint size, void *data)
{
if ( GL_immediate_buffer_handle < 0 ) {
GL_immediate_buffer_handle = opengl_create_buffer_object(GL_ARRAY_BUFFER, GL_STREAM_DRAW);
}
Assert(size > 0 && data != NULL);
if ( GL_immediate_buffer_offset + size > GL_immediate_buffer_size ) {
// incoming data won't fit the immediate buffer. time to reallocate.
GL_immediate_buffer_offset = 0;
GL_immediate_buffer_size += MAX(IMMEDIATE_BUFFER_RESIZE_BLOCK_SIZE, size);
gr_opengl_update_buffer_data(GL_immediate_buffer_handle, GL_immediate_buffer_size, NULL);
}
// only update a section of the immediate vertex buffer
opengl_update_buffer_data_offset(GL_immediate_buffer_handle, GL_immediate_buffer_offset, size, data);
uint old_offset = GL_immediate_buffer_offset;
GL_immediate_buffer_offset += size;
return old_offset;
}
int gr_opengl_create_index_buffer(bool static_buffer)
{
return opengl_create_buffer_object(GL_ELEMENT_ARRAY_BUFFER, static_buffer ? GL_STATIC_DRAW : GL_STREAM_DRAW);
}
int gr_opengl_create_buffer(BufferType type, BufferUsageHint usage)
{
return opengl_create_buffer_object(convertBufferType(type), convertUsageHint(usage));
}