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/*
* Copyright (c) 2017 Rob Clark <rclark@redhat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sub license,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
static struct gbm gbm;
const struct gbm * init_gbm(int drm_fd, int w, int h)
{
gbm.dev = gbm_create_device(drm_fd);
gbm.surface = gbm_surface_create(gbm.dev, w, h,
GBM_FORMAT_XRGB8888,
GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
if (!gbm.surface) {
printf("failed to create gbm surface\n");
return NULL;
}
gbm.width = w;
gbm.height = h;
return &gbm;
}
int init_egl(struct egl *egl, const struct gbm *gbm)
{
EGLint major, minor, n;
static const EGLint context_attribs[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
static const EGLint config_attribs[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RED_SIZE, 1,
EGL_GREEN_SIZE, 1,
EGL_BLUE_SIZE, 1,
EGL_ALPHA_SIZE, 0,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_NONE
};
#define get_proc(name) do { \
egl->name = (void *)eglGetProcAddress(#name); \
} while (0)
get_proc(eglGetPlatformDisplayEXT);
get_proc(eglCreateImageKHR);
get_proc(eglDestroyImageKHR);
get_proc(glEGLImageTargetTexture2DOES);
if (egl->eglGetPlatformDisplayEXT) {
egl->display = egl->eglGetPlatformDisplayEXT(EGL_PLATFORM_GBM_KHR,
gbm->dev, NULL);
} else {
egl->display = eglGetDisplay((void *)gbm->dev);
}
if (!eglInitialize(egl->display, &major, &minor)) {
printf("failed to initialize\n");
return -1;
}
printf("Using display %p with EGL version %d.%d\n",
egl->display, major, minor);
printf("EGL Version \"%s\"\n", eglQueryString(egl->display, EGL_VERSION));
printf("EGL Vendor \"%s\"\n", eglQueryString(egl->display, EGL_VENDOR));
printf("EGL Extensions \"%s\"\n", eglQueryString(egl->display, EGL_EXTENSIONS));
if (!eglBindAPI(EGL_OPENGL_ES_API)) {
printf("failed to bind api EGL_OPENGL_ES_API\n");
return -1;
}
if (!eglChooseConfig(egl->display, config_attribs, &egl->config, 1, &n) || n != 1) {
printf("failed to choose config: %d\n", n);
return -1;
}
egl->context = eglCreateContext(egl->display, egl->config,
EGL_NO_CONTEXT, context_attribs);
if (egl->context == NULL) {
printf("failed to create context\n");
return -1;
}
egl->surface = eglCreateWindowSurface(egl->display, egl->config,
(EGLNativeWindowType)gbm->surface, NULL);
if (egl->surface == EGL_NO_SURFACE) {
printf("failed to create egl surface\n");
return -1;
}
/* connect the context to the surface */
eglMakeCurrent(egl->display, egl->surface, egl->surface, egl->context);
printf("GL Extensions: \"%s\"\n", glGetString(GL_EXTENSIONS));
return 0;
}
int create_program(const char *vs_src, const char *fs_src)
{
GLuint vertex_shader, fragment_shader, program;
GLint ret;
vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, &vs_src, NULL);
glCompileShader(vertex_shader);
glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &ret);
if (!ret) {
char *log;
printf("vertex shader compilation failed!:\n");
glGetShaderiv(vertex_shader, GL_INFO_LOG_LENGTH, &ret);
if (ret > 1) {
log = malloc(ret);
glGetShaderInfoLog(vertex_shader, ret, NULL, log);
printf("%s", log);
}
return -1;
}
fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment_shader, 1, &fs_src, NULL);
glCompileShader(fragment_shader);
glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &ret);
if (!ret) {
char *log;
printf("fragment shader compilation failed!:\n");
glGetShaderiv(fragment_shader, GL_INFO_LOG_LENGTH, &ret);
if (ret > 1) {
log = malloc(ret);
glGetShaderInfoLog(fragment_shader, ret, NULL, log);
printf("%s", log);
}
return -1;
}
program = glCreateProgram();
glAttachShader(program, vertex_shader);
glAttachShader(program, fragment_shader);
return program;
}
int link_program(unsigned program)
{
GLint ret;
glLinkProgram(program);
glGetProgramiv(program, GL_LINK_STATUS, &ret);
if (!ret) {
char *log;
printf("program linking failed!:\n");
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &ret);
if (ret > 1) {
log = malloc(ret);
glGetProgramInfoLog(program, ret, NULL, log);
printf("%s", log);
}
return -1;
}
return 0;
}
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