LookingGlass/client/renderers/EGL/texture_util.c

161 lines
4.3 KiB
C

/**
* Looking Glass
* Copyright (C) 2017-2021 The Looking Glass Authors
* https://looking-glass.io
*
* 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, write to the Free Software Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "texture_util.h"
#include <EGL/egl.h>
#include <GLES3/gl3.h>
#include <GLES2/gl2ext.h>
#include "egldebug.h"
/**
* the following comes from drm_fourcc.h and is included here to avoid the
* external dependency for the few simple defines we need
*/
#define fourcc_code(a, b, c, d) ((uint32_t)(a) | ((uint32_t)(b) << 8) | \
((uint32_t)(c) << 16) | ((uint32_t)(d) << 24))
#define DRM_FORMAT_ARGB8888 fourcc_code('A', 'R', '2', '4')
#define DRM_FORMAT_ABGR8888 fourcc_code('A', 'B', '2', '4')
#define DRM_FORMAT_BGRA1010102 fourcc_code('B', 'A', '3', '0')
#define DRM_FORMAT_ABGR16161616F fourcc_code('A', 'B', '4', 'H')
bool eglTexUtilGetFormat(const EGL_TexSetup * setup, EGL_TexFormat * fmt)
{
switch(setup->pixFmt)
{
case EGL_PF_BGRA:
fmt->bpp = 4;
fmt->format = GL_BGRA_EXT;
fmt->intFormat = GL_BGRA_EXT;
fmt->dataType = GL_UNSIGNED_BYTE;
fmt->fourcc = DRM_FORMAT_ARGB8888;
break;
case EGL_PF_RGBA:
fmt->bpp = 4;
fmt->format = GL_RGBA;
fmt->intFormat = GL_RGBA;
fmt->dataType = GL_UNSIGNED_BYTE;
fmt->fourcc = DRM_FORMAT_ABGR8888;
break;
case EGL_PF_RGBA10:
fmt->bpp = 4;
fmt->format = GL_RGBA;
fmt->intFormat = GL_RGB10_A2;
fmt->dataType = GL_UNSIGNED_INT_2_10_10_10_REV;
fmt->fourcc = DRM_FORMAT_BGRA1010102;
break;
case EGL_PF_RGBA16F:
fmt->bpp = 8;
fmt->format = GL_RGBA;
fmt->intFormat = GL_RGBA16F;
fmt->dataType = GL_HALF_FLOAT;
fmt->fourcc = DRM_FORMAT_ABGR16161616F;
break;
default:
DEBUG_ERROR("Unsupported pixel format");
return false;
}
fmt->width = setup->width;
fmt->height = setup->height;
fmt->stride = setup->stride;
fmt->pitch = setup->stride / fmt->bpp;
fmt->bufferSize = setup->height * setup->stride;
return true;
}
bool eglTexUtilGenBuffers(const EGL_TexFormat * fmt, EGL_TexBuffer * buffers,
int count)
{
for(int i = 0; i < count; ++i)
{
EGL_TexBuffer *buffer = &buffers[i];
buffer->size = fmt->bufferSize;
glGenBuffers(1, &buffer->pbo);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, buffer->pbo);
glBufferStorageEXT(
GL_PIXEL_UNPACK_BUFFER,
fmt->bufferSize,
NULL,
GL_MAP_WRITE_BIT |
GL_MAP_PERSISTENT_BIT_EXT |
GL_MAP_COHERENT_BIT_EXT
);
if (!eglTexUtilMapBuffer(buffer))
return false;
}
return true;
}
void eglTexUtilFreeBuffers(EGL_TexBuffer * buffers, int count)
{
for(int i = 0; i < count; ++i)
{
EGL_TexBuffer *buffer = &buffers[i];
if (!buffer->pbo)
continue;
eglTexUtilUnmapBuffer(buffer);
glDeleteBuffers(1, &buffer->pbo);
buffer->pbo = 0;
}
}
bool eglTexUtilMapBuffer(EGL_TexBuffer * buffer)
{
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, buffer->pbo);
buffer->map = glMapBufferRange(
GL_PIXEL_UNPACK_BUFFER,
0,
buffer->size,
GL_MAP_WRITE_BIT |
GL_MAP_UNSYNCHRONIZED_BIT |
GL_MAP_INVALIDATE_BUFFER_BIT |
GL_MAP_PERSISTENT_BIT_EXT |
GL_MAP_COHERENT_BIT_EXT);
if (!buffer->map)
DEBUG_GL_ERROR("glMapBufferRange failed of %lu bytes", buffer->size);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
return buffer->map;
}
void eglTexUtilUnmapBuffer(EGL_TexBuffer * buffer)
{
if (!buffer->map)
return;
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, buffer->pbo);
glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
buffer->map = NULL;
}