obs-studio/libobs-opengl/gl-helpers.c

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/******************************************************************************
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"
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bool gl_init_face(GLenum target, GLenum type, uint32_t num_levels,
GLenum format, GLint internal_format, bool compressed,
uint32_t width, uint32_t height, uint32_t size,
const void ***p_data)
{
bool success = true;
const void **data = p_data ? *p_data : NULL;
uint32_t i;
for (i = 0; i < num_levels; i++) {
if (compressed) {
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glCompressedTexImage2D(target, i, internal_format,
width, height, 0, size,
data ? *data : NULL);
if (!gl_success("glCompressedTexImage2D"))
success = false;
} else {
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glTexImage2D(target, i, internal_format, width, height,
0, format, type, data ? *data : NULL);
if (!gl_success("glTexImage2D"))
success = false;
}
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if (data)
data++;
size /= 4;
width /= 2;
height /= 2;
if (width == 0) width = 1;
if (height == 0) height = 1;
}
if (data)
*p_data = data;
return success;
}
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bool gl_copy_texture(struct gs_device *device,
GLuint dst, GLenum dst_target,
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GLuint src, GLenum src_target,
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uint32_t width, uint32_t height)
{
bool success = false;
if (device->copy_type == COPY_TYPE_ARB) {
glCopyImageSubData(src, src_target, 0, 0, 0, 0,
dst, dst_target, 0, 0, 0, 0,
width, height, 1);
success = gl_success("glCopyImageSubData");
} else if (device->copy_type == COPY_TYPE_NV) {
glCopyImageSubDataNV(src, src_target, 0, 0, 0, 0,
dst, dst_target, 0, 0, 0, 0,
width, height, 1);
success = gl_success("glCopyImageSubDataNV");
} else if (device->copy_type == COPY_TYPE_FBO_BLIT) {
/* TODO (implement FBOs) */
}
return success;
}
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bool gl_create_buffer(GLenum target, GLuint *buffer, GLsizeiptr size,
const GLvoid *data, GLenum usage)
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{
bool success;
if (!gl_gen_buffers(1, buffer))
return false;
if (!gl_bind_buffer(target, *buffer))
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return false;
glBufferData(target, size, data, usage);
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success = gl_success("glBufferData");
gl_bind_buffer(target, 0);
return success;
}
bool update_buffer(GLenum target, GLuint buffer, void *data, size_t size)
{
void *ptr;
bool success = true;
if (!gl_bind_buffer(target, buffer))
return false;
ptr = glMapBuffer(target, GL_WRITE_ONLY);
success = gl_success("glMapBuffer");
if (success && ptr) {
memcpy(ptr, data, size);
glUnmapBuffer(target);
}
gl_bind_buffer(target, 0);
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return success;
}