yolobs-studio/libobs-opengl/gl-indexbuffer.c

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2016-02-23 23:16:51 +00:00
/******************************************************************************
Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
#include "gl-subsystem.h"
static inline bool init_ib(struct gs_index_buffer *ib)
{
GLenum usage = ib->dynamic ? GL_DYNAMIC_DRAW : GL_STATIC_DRAW;
bool success;
success = gl_create_buffer(GL_ARRAY_BUFFER, &ib->buffer, ib->size,
ib->data, usage);
if (!ib->dynamic) {
bfree(ib->data);
ib->data = NULL;
}
return success;
}
gs_indexbuffer_t *device_indexbuffer_create(gs_device_t *device,
enum gs_index_type type, void *indices, size_t num,
uint32_t flags)
{
struct gs_index_buffer *ib = bzalloc(sizeof(struct gs_index_buffer));
size_t width = type == GS_UNSIGNED_LONG ? sizeof(long) : sizeof(short);
ib->device = device;
ib->data = indices;
ib->dynamic = flags & GS_DYNAMIC;
ib->num = num;
ib->width = width;
ib->size = width * num;
ib->type = type;
ib->gl_type = type == GS_UNSIGNED_LONG ? GL_UNSIGNED_INT :
GL_UNSIGNED_SHORT;
if (!init_ib(ib)) {
blog(LOG_ERROR, "device_indexbuffer_create (GL) failed");
gs_indexbuffer_destroy(ib);
return NULL;
}
return ib;
}
void gs_indexbuffer_destroy(gs_indexbuffer_t *ib)
{
if (ib) {
if (ib->buffer)
gl_delete_buffers(1, &ib->buffer);
bfree(ib->data);
bfree(ib);
}
}
void gs_indexbuffer_flush(gs_indexbuffer_t *ib)
{
if (!ib->dynamic) {
blog(LOG_ERROR, "Index buffer is not dynamic");
goto fail;
}
if (!update_buffer(GL_ARRAY_BUFFER, ib->buffer, ib->data, ib->size))
goto fail;
return;
fail:
blog(LOG_ERROR, "gs_indexbuffer_flush (GL) failed");
}
void *gs_indexbuffer_get_data(const gs_indexbuffer_t *ib)
{
return ib->data;
}
size_t gs_indexbuffer_get_num_indices(const gs_indexbuffer_t *ib)
{
return ib->num;
}
enum gs_index_type gs_indexbuffer_get_type(const gs_indexbuffer_t *ib)
{
return ib->type;
}
void device_load_indexbuffer(gs_device_t *device, gs_indexbuffer_t *ib)
{
if (ib == device->cur_index_buffer)
return;
device->cur_index_buffer = ib;
if (!gl_bind_buffer(GL_ELEMENT_ARRAY_BUFFER, ib->buffer))
blog(LOG_ERROR, "device_load_indexbuffer (GL) failed");
}