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6fafc26014
Add a collection of egl_fb_*() helper functions to manage and use opengl framebuffers, which is a common pattern in UI code with opengl support. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Message-id: 20170614084149.31314-2-kraxel@redhat.com
396 lines
11 KiB
C
396 lines
11 KiB
C
/*
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* Copyright (C) 2015-2016 Gerd Hoffmann <kraxel@redhat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include <glob.h>
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#include <dirent.h>
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#include "qemu/error-report.h"
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#include "ui/egl-helpers.h"
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EGLDisplay *qemu_egl_display;
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EGLConfig qemu_egl_config;
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/* ------------------------------------------------------------------ */
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void egl_fb_destroy(egl_fb *fb)
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{
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if (!fb->framebuffer) {
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return;
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}
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if (fb->delete_texture) {
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glDeleteTextures(1, &fb->texture);
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fb->delete_texture = false;
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}
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glDeleteFramebuffers(1, &fb->framebuffer);
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fb->width = 0;
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fb->height = 0;
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fb->texture = 0;
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fb->framebuffer = 0;
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}
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void egl_fb_setup_default(egl_fb *fb, int width, int height)
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{
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fb->width = width;
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fb->height = height;
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fb->framebuffer = 0; /* default framebuffer */
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}
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void egl_fb_create_for_tex(egl_fb *fb, int width, int height, GLuint texture)
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{
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fb->width = width;
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fb->height = height;
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fb->texture = texture;
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if (!fb->framebuffer) {
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glGenFramebuffers(1, &fb->framebuffer);
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}
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glBindFramebuffer(GL_FRAMEBUFFER_EXT, fb->framebuffer);
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glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
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GL_TEXTURE_2D, fb->texture, 0);
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}
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void egl_fb_create_new_tex(egl_fb *fb, int width, int height)
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{
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GLuint texture;
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height,
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0, GL_BGRA, GL_UNSIGNED_BYTE, 0);
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egl_fb_create_for_tex(fb, width, height, texture);
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fb->delete_texture = true;
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}
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void egl_fb_blit(egl_fb *dst, egl_fb *src, bool flip)
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{
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GLuint y1, y2;
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glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst->framebuffer);
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glViewport(0, 0, dst->width, dst->height);
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y1 = flip ? src->height : 0;
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y2 = flip ? 0 : src->height;
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glBlitFramebuffer(0, y1, src->width, y2,
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0, 0, dst->width, dst->height,
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GL_COLOR_BUFFER_BIT, GL_LINEAR);
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}
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void egl_fb_read(void *dst, egl_fb *src)
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{
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glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
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glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
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glReadPixels(0, 0, src->width, src->height,
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GL_BGRA, GL_UNSIGNED_BYTE, dst);
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}
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/* ---------------------------------------------------------------------- */
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#ifdef CONFIG_OPENGL_DMABUF
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int qemu_egl_rn_fd;
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struct gbm_device *qemu_egl_rn_gbm_dev;
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EGLContext qemu_egl_rn_ctx;
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static int qemu_egl_rendernode_open(const char *rendernode)
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{
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DIR *dir;
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struct dirent *e;
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int r, fd;
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char *p;
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if (rendernode) {
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return open(rendernode, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
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}
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dir = opendir("/dev/dri");
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if (!dir) {
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return -1;
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}
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fd = -1;
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while ((e = readdir(dir))) {
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if (e->d_type != DT_CHR) {
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continue;
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}
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if (strncmp(e->d_name, "renderD", 7)) {
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continue;
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}
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p = g_strdup_printf("/dev/dri/%s", e->d_name);
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r = open(p, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
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if (r < 0) {
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g_free(p);
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continue;
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}
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fd = r;
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g_free(p);
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break;
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}
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closedir(dir);
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if (fd < 0) {
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return -1;
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}
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return fd;
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}
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int egl_rendernode_init(const char *rendernode)
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{
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qemu_egl_rn_fd = -1;
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int rc;
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qemu_egl_rn_fd = qemu_egl_rendernode_open(rendernode);
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if (qemu_egl_rn_fd == -1) {
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error_report("egl: no drm render node available");
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goto err;
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}
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qemu_egl_rn_gbm_dev = gbm_create_device(qemu_egl_rn_fd);
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if (!qemu_egl_rn_gbm_dev) {
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error_report("egl: gbm_create_device failed");
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goto err;
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}
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rc = qemu_egl_init_dpy_mesa((EGLNativeDisplayType)qemu_egl_rn_gbm_dev);
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if (rc != 0) {
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/* qemu_egl_init_dpy_mesa reports error */
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goto err;
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}
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if (!epoxy_has_egl_extension(qemu_egl_display,
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"EGL_KHR_surfaceless_context")) {
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error_report("egl: EGL_KHR_surfaceless_context not supported");
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goto err;
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}
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if (!epoxy_has_egl_extension(qemu_egl_display,
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"EGL_MESA_image_dma_buf_export")) {
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error_report("egl: EGL_MESA_image_dma_buf_export not supported");
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goto err;
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}
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qemu_egl_rn_ctx = qemu_egl_init_ctx();
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if (!qemu_egl_rn_ctx) {
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error_report("egl: egl_init_ctx failed");
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goto err;
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}
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return 0;
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err:
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if (qemu_egl_rn_gbm_dev) {
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gbm_device_destroy(qemu_egl_rn_gbm_dev);
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}
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if (qemu_egl_rn_fd != -1) {
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close(qemu_egl_rn_fd);
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}
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return -1;
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}
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int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc)
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{
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EGLImageKHR image;
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EGLint num_planes, fd;
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image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
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EGL_GL_TEXTURE_2D_KHR,
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(EGLClientBuffer)(unsigned long)tex_id,
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NULL);
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if (!image) {
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return -1;
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}
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eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
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&num_planes, NULL);
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if (num_planes != 1) {
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eglDestroyImageKHR(qemu_egl_display, image);
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return -1;
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}
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eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
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eglDestroyImageKHR(qemu_egl_display, image);
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return fd;
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}
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#endif /* CONFIG_OPENGL_DMABUF */
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/* ---------------------------------------------------------------------- */
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EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, Window win)
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{
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EGLSurface esurface;
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EGLBoolean b;
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esurface = eglCreateWindowSurface(qemu_egl_display,
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qemu_egl_config,
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(EGLNativeWindowType)win, NULL);
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if (esurface == EGL_NO_SURFACE) {
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error_report("egl: eglCreateWindowSurface failed");
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return NULL;
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}
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b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
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if (b == EGL_FALSE) {
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error_report("egl: eglMakeCurrent failed");
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return NULL;
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}
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return esurface;
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}
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/* ---------------------------------------------------------------------- */
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/*
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* Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
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*
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* Create an EGLDisplay from a native display type. This is a little quirky
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* for a few reasons.
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*
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* 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
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* use, but have different function signatures in the third argument; this
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* happens not to matter for us, at the moment, but it means epoxy won't alias
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* them together.
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*
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* 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
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* means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
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* will crash.
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*
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* 3: You can't tell whether you have EGL 1.5 at this point, because
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* eglQueryString(EGL_VERSION) is a property of the display, which we don't
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* have yet. So you have to query for extensions no matter what. Fortunately
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* epoxy_has_egl_extension _does_ let you query for client extensions, so
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* we don't have to write our own extension string parsing.
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*
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* 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
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* needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
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* function pointer.
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* We can workaround this (circular dependency) by probing for the EGL 1.5
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* platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
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* like mesa will be able to advertise these (even though it can do EGL 1.5).
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*/
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static EGLDisplay qemu_egl_get_display(EGLNativeDisplayType native,
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EGLenum platform)
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{
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EGLDisplay dpy = EGL_NO_DISPLAY;
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/* In practise any EGL 1.5 implementation would support the EXT extension */
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if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
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PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
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(void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
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if (getPlatformDisplayEXT && platform != 0) {
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dpy = getPlatformDisplayEXT(platform, native, NULL);
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}
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}
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if (dpy == EGL_NO_DISPLAY) {
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/* fallback */
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dpy = eglGetDisplay(native);
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}
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return dpy;
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}
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static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
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EGLenum platform)
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{
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static const EGLint conf_att_gl[] = {
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EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
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EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
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EGL_RED_SIZE, 5,
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EGL_GREEN_SIZE, 5,
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EGL_BLUE_SIZE, 5,
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EGL_ALPHA_SIZE, 0,
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EGL_NONE,
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};
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EGLint major, minor;
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EGLBoolean b;
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EGLint n;
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qemu_egl_display = qemu_egl_get_display(dpy, platform);
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if (qemu_egl_display == EGL_NO_DISPLAY) {
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error_report("egl: eglGetDisplay failed");
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return -1;
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}
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b = eglInitialize(qemu_egl_display, &major, &minor);
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if (b == EGL_FALSE) {
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error_report("egl: eglInitialize failed");
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return -1;
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}
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b = eglBindAPI(EGL_OPENGL_API);
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if (b == EGL_FALSE) {
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error_report("egl: eglBindAPI failed");
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return -1;
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}
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b = eglChooseConfig(qemu_egl_display, conf_att_gl,
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&qemu_egl_config, 1, &n);
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if (b == EGL_FALSE || n != 1) {
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error_report("egl: eglChooseConfig failed");
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return -1;
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}
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return 0;
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}
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int qemu_egl_init_dpy_x11(EGLNativeDisplayType dpy)
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{
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#ifdef EGL_KHR_platform_x11
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return qemu_egl_init_dpy(dpy, EGL_PLATFORM_X11_KHR);
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#else
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return qemu_egl_init_dpy(dpy, 0);
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#endif
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}
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int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy)
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{
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#ifdef EGL_MESA_platform_gbm
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return qemu_egl_init_dpy(dpy, EGL_PLATFORM_GBM_MESA);
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#else
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return qemu_egl_init_dpy(dpy, 0);
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#endif
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}
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EGLContext qemu_egl_init_ctx(void)
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{
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static const EGLint ctx_att_gl[] = {
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EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
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EGL_NONE
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};
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EGLContext ectx;
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EGLBoolean b;
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ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
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ctx_att_gl);
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if (ectx == EGL_NO_CONTEXT) {
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error_report("egl: eglCreateContext failed");
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return NULL;
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}
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b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
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if (b == EGL_FALSE) {
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error_report("egl: eglMakeCurrent failed");
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return NULL;
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}
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return ectx;
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}
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