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/*
* Exercise EGL API functions
*/
#define EGL_EGLEXT_PROTOTYPES
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES/gl.h>
/*#define FRONTBUFFER*/
static void _subset_Rectf(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2,
GLfloat r, GLfloat g, GLfloat b)
{
GLfloat v[4][2], c[4][4];
int i;
v[0][0] = x1; v[0][1] = y1;
v[1][0] = x2; v[1][1] = y1;
v[2][0] = x2; v[2][1] = y2;
v[3][0] = x1; v[3][1] = y2;
for (i = 0; i < 4; i++) {
c[i][0] = r;
c[i][1] = g;
c[i][2] = b;
c[i][3] = 1.0;
}
glVertexPointer(2, GL_FLOAT, 0, v);
glColorPointer(4, GL_FLOAT, 0, v);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
}
static void redraw(EGLDisplay dpy, EGLSurface surf, int rot)
{
GLfloat r, g, b;
printf("Redraw event\n");
glClearColor( rand()/(float)RAND_MAX,
rand()/(float)RAND_MAX,
rand()/(float)RAND_MAX,
1);
glClear( GL_COLOR_BUFFER_BIT );
r = rand()/(float)RAND_MAX;
g = rand()/(float)RAND_MAX;
b = rand()/(float)RAND_MAX;
glPushMatrix();
glRotatef(rot, 0, 0, 1);
glScalef(.5, .5, .5);
_subset_Rectf( -1, -1, 1, 1, r, g, b );
glPopMatrix();
#ifdef FRONTBUFFER
glFlush();
#else
eglSwapBuffers( dpy, surf );
#endif
glFinish();
}
/**
* Test EGL_MESA_screen_surface functions
*/
static void
TestScreens(EGLDisplay dpy)
{
#define MAX 8
EGLScreenMESA screens[MAX];
EGLint numScreens;
EGLint i;
eglGetScreensMESA(dpy, screens, MAX, &numScreens);
printf("Found %d screens\n", numScreens);
for (i = 0; i < numScreens; i++) {
printf(" Screen %d handle: %d\n", i, (int) screens[i]);
}
}
int
main(int argc, char *argv[])
{
int maj, min;
EGLContext ctx;
EGLSurface pbuffer, screen_surf;
EGLConfig configs[10];
EGLint numConfigs, i;
EGLBoolean b;
const EGLint pbufAttribs[] = {
EGL_WIDTH, 500,
EGL_HEIGHT, 500,
EGL_NONE
};
const EGLint screenAttribs[] = {
EGL_WIDTH, 1024,
EGL_HEIGHT, 768,
EGL_NONE
};
EGLModeMESA mode;
EGLScreenMESA screen;
EGLint count;
EGLDisplay d = eglGetDisplay(EGL_DEFAULT_DISPLAY);
assert(d);
if (!eglInitialize(d, &maj, &min)) {
printf("demo: eglInitialize failed\n");
exit(1);
}
printf("EGL version = %d.%d\n", maj, min);
printf("EGL_VENDOR = %s\n", eglQueryString(d, EGL_VENDOR));
if (!strstr(eglQueryString(d, EGL_EXTENSIONS),
"EGL_MESA_screen_surface")) {
printf("EGL_MESA_screen_surface is not supported\n");
exit(1);
}
eglGetConfigs(d, configs, 10, &numConfigs);
printf("Got %d EGL configs:\n", numConfigs);
for (i = 0; i < numConfigs; i++) {
EGLint id, red, depth;
eglGetConfigAttrib(d, configs[i], EGL_CONFIG_ID, &id);
eglGetConfigAttrib(d, configs[i], EGL_RED_SIZE, &red);
eglGetConfigAttrib(d, configs[i], EGL_DEPTH_SIZE, &depth);
printf("%2d: Red Size = %d Depth Size = %d\n", id, red, depth);
}
eglGetScreensMESA(d, &screen, 1, &count);
eglGetModesMESA(d, screen, &mode, 1, &count);
ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL);
if (ctx == EGL_NO_CONTEXT) {
printf("failed to create context\n");
return 0;
}
pbuffer = eglCreatePbufferSurface(d, configs[0], pbufAttribs);
if (pbuffer == EGL_NO_SURFACE) {
printf("failed to create pbuffer\n");
return 0;
}
b = eglMakeCurrent(d, pbuffer, pbuffer, ctx);
if (!b) {
printf("make current failed\n");
return 0;
}
b = eglMakeCurrent(d, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
screen_surf = eglCreateScreenSurfaceMESA(d, configs[0], screenAttribs);
if (screen_surf == EGL_NO_SURFACE) {
printf("failed to create screen surface\n");
return 0;
}
eglShowScreenSurfaceMESA(d, screen, screen_surf, mode);
b = eglMakeCurrent(d, screen_surf, screen_surf, ctx);
if (!b) {
printf("make current failed\n");
return 0;
}
glViewport(0, 0, 1024, 768);
glClearColor( 0,
1.0,
0,
1);
glClear( GL_COLOR_BUFFER_BIT );
TestScreens(d);
glShadeModel( GL_FLAT );
for (i = 0; i < 6; i++) {
redraw(d, screen_surf, i*10 );
printf("sleep(1)\n");
sleep(1);
}
eglDestroySurface(d, pbuffer);
eglDestroyContext(d, ctx);
eglTerminate(d);
return 0;
}
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