progs/egl: Fix screen surface demos.

Set the screen surface size to the mode size, as the spec requires the
screen surface size to be larger than the mode size.  Besides, bind the
API to OpenGL as they are written in it.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>

progs/egl/demo1.c

@@ -114,6 +114,7 @@ main(int argc, char *argv[])
 
    PrintConfigs(d, configs, numConfigs);
 
+   eglBindAPI(EGL_OPENGL_API);
    ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL);
    if (ctx == EGL_NO_CONTEXT) {
       printf("failed to create context\n");

progs/egl/demo2.c

@@ -111,11 +111,7 @@ main(int argc, char *argv[])
       EGL_HEIGHT, 500,
       EGL_NONE
    };
-   const EGLint screenAttribs[] = {
-      EGL_WIDTH, 1024,
-      EGL_HEIGHT, 768,
-      EGL_NONE
-   };
+   EGLint screenAttribs[32];
    EGLModeMESA mode;
    EGLScreenMESA screen;
    EGLint count;
@@ -149,6 +145,7 @@ main(int argc, char *argv[])
    eglGetScreensMESA(d, &screen, 1, &count);
    eglGetModesMESA(d, screen, &mode, 1, &count);
 
+   eglBindAPI(EGL_OPENGL_API);
    ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL);
    if (ctx == EGL_NO_CONTEXT) {
       printf("failed to create context\n");
@@ -169,6 +166,13 @@ main(int argc, char *argv[])
 
    b = eglMakeCurrent(d, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
 
+   i = 0;
+   screenAttribs[i++] = EGL_WIDTH;
+   eglGetModeAttribMESA(d, mode, EGL_WIDTH, &screenAttribs[i++]);
+   screenAttribs[i++] = EGL_HEIGHT;
+   eglGetModeAttribMESA(d, mode, EGL_HEIGHT, &screenAttribs[i++]);
+   screenAttribs[i] = EGL_NONE;
+
    screen_surf = eglCreateScreenSurfaceMESA(d, configs[0], screenAttribs);
    if (screen_surf == EGL_NO_SURFACE) {
       printf("failed to create screen surface\n");

progs/egl/demo3.c

@@ -564,11 +564,8 @@ main(int argc, char *argv[])
    EGLint numConfigs, count;
    EGLBoolean b;
    const GLubyte *bitmap;
-   const EGLint screenAttribs[] = {
-      EGL_WIDTH, 1024,
-      EGL_HEIGHT, 768,
-      EGL_NONE
-   };
+   EGLint screenAttribs[32];
+   EGLint i;
 
    EGLDisplay d = eglGetDisplay(EGL_DEFAULT_DISPLAY);
    assert(d);
@@ -590,12 +587,20 @@ main(int argc, char *argv[])
    eglGetScreensMESA(d, &screen, 1, &count);
    eglGetModesMESA(d, screen, &mode, 1, &count);
 
+   eglBindAPI(EGL_OPENGL_API);
    ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL);
    if (ctx == EGL_NO_CONTEXT) {
       printf("failed to create context\n");
       return 0;
    }
 
+   i = 0;
+   screenAttribs[i++] = EGL_WIDTH;
+   eglGetModeAttribMESA(d, mode, EGL_WIDTH, &screenAttribs[i++]);
+   screenAttribs[i++] = EGL_HEIGHT;
+   eglGetModeAttribMESA(d, mode, EGL_HEIGHT, &screenAttribs[i++]);
+   screenAttribs[i] = EGL_NONE;
+
    screen_surf = eglCreateScreenSurfaceMESA(d, configs[0], screenAttribs);
    if (screen_surf == EGL_NO_SURFACE) {
       printf("failed to create screen surface\n");

progs/egl/eglgears.c

@@ -426,6 +426,7 @@ main(int argc, char *argv[])
 	}
 	printf("eglgears: Using screen mode/size %d: %d x %d\n", chosenMode, width, height);
 
+	eglBindAPI(EGL_OPENGL_API);
 	ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL);
 	if (ctx == EGL_NO_CONTEXT) {
 		printf("eglgears: failed to create context\n");

progs/egl/egltri.c

@@ -208,6 +208,7 @@ int main(int argc, char *argv[])
 	}
 	printf("egltri: Using screen mode/size %d: %d x %d\n", chosenMode, width, height);
 
+	eglBindAPI(EGL_OPENGL_API);
 	ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL);
 	if (ctx == EGL_NO_CONTEXT) {
 		printf("egltri: failed to create context\n");