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// SPDX-License-Identifier: BSD-3-Clause
/*
* egl_frame.c - minimal EGL/GLES2 offscreen render test for the vGPU guest.
*
* Tries, in order: the EGL_EXT_platform_device platform with each enumerated
* EGLDeviceEXT, EGL_MESA_platform_surfaceless, then EGL_DEFAULT_DISPLAY.
* For the first display that initializes it creates an offscreen pbuffer
* context, renders colour bands into an FBO, reads them back and writes a
* PPM. One greppable line per stage.
*
* Build (guest): gcc -O2 -o egl_frame egl_frame.c -lEGL -lGLESv2
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES2/gl2.h>
#define W 320
#define H 240
static EGLDisplay try_display(const char *name, EGLDisplay dpy,
const char *dev_name)
{
EGLint major = 0, minor = 0;
if (dpy == EGL_NO_DISPLAY) {
printf("EGL_PLATFORM %s -> no display\n", name);
return EGL_NO_DISPLAY;
}
if (!eglInitialize(dpy, &major, &minor)) {
printf("EGL_PLATFORM %s -> init fail 0x%x\n", name,
eglGetError());
return EGL_NO_DISPLAY;
}
printf("EGL_PLATFORM %s ok %d.%d vendor=%s%s%s\n", name, major, minor,
eglQueryString(dpy, EGL_VENDOR),
dev_name ? " device=" : "", dev_name ? dev_name : "");
return dpy;
}
static EGLDisplay get_display(void)
{
PFNEGLGETPLATFORMDISPLAYEXTPROC gp =
(PFNEGLGETPLATFORMDISPLAYEXTPROC)eglGetProcAddress(
"eglGetPlatformDisplayEXT");
PFNEGLQUERYDEVICESEXTPROC qd =
(PFNEGLQUERYDEVICESEXTPROC)eglGetProcAddress(
"eglQueryDevicesEXT");
EGLDisplay dpy;
if (gp && qd) {
EGLDeviceEXT devs[8];
EGLint n = 0;
int i;
if (qd(8, devs, &n) && n > 0) {
printf("EGL_DEVICES n=%d\n", n);
for (i = 0; i < n; i++) {
EGLDisplay d = gp(EGL_PLATFORM_DEVICE_EXT,
devs[i], NULL);
dpy = try_display("device", d, "enum");
if (dpy != EGL_NO_DISPLAY)
return dpy;
}
} else {
printf("EGL_DEVICES n=0\n");
}
if (gp) {
dpy = try_display("surfaceless",
gp(EGL_PLATFORM_SURFACELESS_MESA,
NULL, NULL), NULL);
if (dpy != EGL_NO_DISPLAY)
return dpy;
}
}
return try_display("default", eglGetDisplay(EGL_DEFAULT_DISPLAY),
NULL);
}
static int render(EGLDisplay dpy)
{
EGLConfig cfg;
EGLint ncfg = 0;
EGLSurface surf;
EGLContext ctx;
GLuint fbo = 0, tex = 0;
unsigned char *px;
FILE *f;
int i;
EGLint attrs[] = {
EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_RED_SIZE, 8, EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8, EGL_ALPHA_SIZE, 8,
EGL_NONE
};
EGLint pattrs[] = { EGL_WIDTH, W, EGL_HEIGHT, H, EGL_NONE };
EGLint cattrs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
if (!eglChooseConfig(dpy, attrs, &cfg, 1, &ncfg) || ncfg < 1) {
printf("EGL_CONFIG_FAIL err=0x%x\n", eglGetError());
return 1;
}
surf = eglCreatePbufferSurface(dpy, cfg, pattrs);
if (surf == EGL_NO_SURFACE) {
printf("EGL_PBUFFER_FAIL err=0x%x\n", eglGetError());
return 1;
}
ctx = eglCreateContext(dpy, cfg, EGL_NO_CONTEXT, cattrs);
if (ctx == EGL_NO_CONTEXT) {
printf("EGL_CONTEXT_FAIL err=0x%x\n", eglGetError());
return 1;
}
if (!eglMakeCurrent(dpy, surf, surf, ctx)) {
printf("EGL_CURRENT_FAIL err=0x%x\n", eglGetError());
return 1;
}
printf("GL_RENDERER %s\n", glGetString(GL_RENDERER));
printf("GL_VERSION %s\n", glGetString(GL_VERSION));
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, W, H, 0, GL_RGBA,
GL_UNSIGNED_BYTE, NULL);
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, tex, 0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) !=
GL_FRAMEBUFFER_COMPLETE) {
printf("GL_FBO_FAIL\n");
return 1;
}
for (i = 0; i < 16; i++) {
glEnable(GL_SCISSOR_TEST);
glScissor(0, i * H / 16, W, H / 16);
glClearColor((float)i / 16.0f, 1.0f - (float)i / 16.0f,
0.5f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
}
glFinish();
printf("GL_ERR 0x%x\n", glGetError());
px = (unsigned char *)malloc(W * H * 4);
glReadPixels(0, 0, W, H, GL_RGBA, GL_UNSIGNED_BYTE, px);
{
const char *out = getenv("EGL_FRAME_OUT");
if (!out)
out = "/tmp/egl_frame.ppm";
f = fopen(out, "wb");
if (!f) {
printf("PPM_OPEN_FAIL\n");
return 1;
}
fprintf(f, "P6\n%d %d\n255\n", W, H);
for (i = 0; i < W * H; i++)
fwrite(px + i * 4, 1, 3, f);
fclose(f);
printf("EGL_FRAME_WRITTEN %s\n", out);
}
printf("EGL_FRAME_OK\n");
return 0;
}
int main(void)
{
EGLDisplay dpy;
const char *ext;
setvbuf(stdout, NULL, _IONBF, 0);
ext = eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS);
printf("EGL_CLIENT_EXT %s\n", ext ? ext : "(none)");
dpy = get_display();
if (dpy == EGL_NO_DISPLAY) {
printf("EGL_ALL_PLATFORMS_FAILED\n");
return 1;
}
return render(dpy);
}
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