41fad2d1a4
This Fixes a minor flaw with the API where data had to always be mutable to be usable by the API. Functions that do not modify the fundamental underlying data of a structure should be marked as constant, both for safety and to signify that the parameter is input only and will not be modified by the function using it.
114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/******************************************************************************
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Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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******************************************************************************/
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#include "gl-subsystem.h"
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static inline bool init_ib(struct gs_index_buffer *ib)
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{
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GLenum usage = ib->dynamic ? GL_DYNAMIC_DRAW : GL_STATIC_DRAW;
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bool success;
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success = gl_create_buffer(GL_ARRAY_BUFFER, &ib->buffer, ib->size,
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ib->data, usage);
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if (!ib->dynamic) {
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bfree(ib->data);
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ib->data = NULL;
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}
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return success;
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}
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gs_indexbuffer_t *device_indexbuffer_create(gs_device_t *device,
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enum gs_index_type type, void *indices, size_t num,
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uint32_t flags)
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{
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struct gs_index_buffer *ib = bzalloc(sizeof(struct gs_index_buffer));
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size_t width = type == GS_UNSIGNED_LONG ? sizeof(long) : sizeof(short);
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ib->device = device;
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ib->data = indices;
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ib->dynamic = flags & GS_DYNAMIC;
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ib->num = num;
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ib->width = width;
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ib->size = width * num;
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ib->type = type;
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ib->gl_type = type == GS_UNSIGNED_LONG ? GL_UNSIGNED_INT :
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GL_UNSIGNED_SHORT;
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if (!init_ib(ib)) {
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blog(LOG_ERROR, "device_indexbuffer_create (GL) failed");
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gs_indexbuffer_destroy(ib);
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return NULL;
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}
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return ib;
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}
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void gs_indexbuffer_destroy(gs_indexbuffer_t *ib)
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{
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if (ib) {
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if (ib->buffer)
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gl_delete_buffers(1, &ib->buffer);
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bfree(ib->data);
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bfree(ib);
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}
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}
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void gs_indexbuffer_flush(gs_indexbuffer_t *ib)
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{
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if (!ib->dynamic) {
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blog(LOG_ERROR, "Index buffer is not dynamic");
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goto fail;
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}
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if (!update_buffer(GL_ARRAY_BUFFER, ib->buffer, ib->data, ib->size))
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goto fail;
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return;
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fail:
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blog(LOG_ERROR, "gs_indexbuffer_flush (GL) failed");
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}
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void *gs_indexbuffer_get_data(const gs_indexbuffer_t *ib)
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{
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return ib->data;
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}
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size_t gs_indexbuffer_get_num_indices(const gs_indexbuffer_t *ib)
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{
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return ib->num;
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}
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enum gs_index_type gs_indexbuffer_get_type(const gs_indexbuffer_t *ib)
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{
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return ib->type;
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}
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void device_load_indexbuffer(gs_device_t *device, gs_indexbuffer_t *ib)
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{
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if (ib == device->cur_index_buffer)
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return;
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device->cur_index_buffer = ib;
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if (!gl_bind_buffer(GL_ELEMENT_ARRAY_BUFFER, ib->buffer))
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blog(LOG_ERROR, "device_load_indexbuffer (GL) failed");
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}
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