rename window system and context choice variables

[gltest.git] / eglbackend.cpp

diff --git a/eglbackend.cpp b/eglbackend.cpp
index 359d54ac0d133d9a10e2b84588fb02a24dcb445e..0d5e5e60f14731db48a3eb0c66ab7239195611e6 100644 (file)
--- a/eglbackend.cpp
+++ b/eglbackend.cpp
@@ -1,3 +1,21 @@
+/* gltest - small OpenGL tearing test program
+ * Copyright (C) 2012-2013 Ralf Jung <post@ralfj.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
 #include "eglbackend.h"
 
 #include <stdlib.h>
@@ -6,6 +24,10 @@
 
 #include <EGL/eglext.h>
 
+#if !defined(CON_GL1) && !defined(CON_GLES2)
+#error "Valid GL contexts for EGL are: GL1, GLES2"
+#endif
+
 static const char *eglErrorToString(EGLint e)
 {
 #define CASE(name) case name: return #name
@@ -31,13 +53,21 @@ static void exitEglError(const char *what)
        exit(1);
 }
 
-/* attributes for a double buffered visual in RGBA format with at least
-* 4 bits per color */
+static const EGLint context_attribs[] = {
+#ifdef CON_GLES2
+       EGL_CONTEXT_CLIENT_VERSION, 2,
+#endif
+       EGL_NONE
+};
 static const EGLint config_attribs[] = {
        EGL_RED_SIZE,             4,
        EGL_GREEN_SIZE,           4,
        EGL_BLUE_SIZE,            4,
+#ifdef CON_GLES2
+       EGL_RENDERABLE_TYPE,      EGL_OPENGL_ES2_BIT,
+#else
        EGL_RENDERABLE_TYPE,      EGL_OPENGL_BIT,
+#endif
        EGL_NONE,
 };
 
@@ -47,17 +77,31 @@ VisualID EGLBackend::initialize(Display *xDisplay)
                // get connection and bind API
                EGLint eglMajor, eglMinor;
                display = eglGetDisplay(xDisplay);
-               if (display == EGL_NO_DISPLAY)                         
+               if (display == EGL_NO_DISPLAY)
                        exitEglError("Failed to get EGL display");
-               if (eglInitialize(display, &eglMajor, &eglMinor) == EGL_FALSE)                   
+               if (eglInitialize(display, &eglMajor, &eglMinor) == EGL_FALSE)
                        exitEglError("Failed to initialize EGL");
                printf("Using EGL version %d.%d\n", eglMajor, eglMinor);
-               eglBindAPI(EGL_OPENGL_API);
+               if (eglMajor == 1 && eglMinor < 3) {
+                       fprintf(stderr, "Need at least EGL 1.3 to function properly\n");
+                       exit(1);
+               }
+#ifdef CON_GLES2
+               if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE)
+#else
+               if (eglBindAPI(EGL_OPENGL_API) == EGL_FALSE)
+#endif
+                       exitEglError("Failed to bind API");
                // get an appropriate config
                EGLConfig configs[1];
                EGLint count;
-               if (eglChooseConfig(display, config_attribs, configs, 1, &count) == EGL_FALSE || count == 0)                            
+               if (eglChooseConfig(display, config_attribs, configs, 1, &count) == EGL_FALSE){
                        exitEglError("Failed to choose config");
+               }
+               if (count == 0) {
+                       fprintf(stderr, "Found no matching EGL configuration\n");
+                       exit(1);
+               }
                config = configs[0];
        }
        // return visual ID
@@ -70,8 +114,8 @@ void EGLBackend::createContext(Window window)
 {
        assert(display != EGL_NO_DISPLAY && context == EGL_NO_CONTEXT);
        surface = eglCreateWindowSurface(display, config, window, NULL);
-       /* create an EGL context and use it with the surface */                                    
-       context = eglCreateContext(display, config, EGL_NO_CONTEXT, NULL);
+       // create an EGL context and use it with the surface
+       context = eglCreateContext(display, config, EGL_NO_CONTEXT, context_attribs);
        if (context == EGL_NO_CONTEXT)
                exitEglError("Failed to create context");
        if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE)
@@ -94,11 +138,26 @@ EGLBackend::~EGLBackend()
 void EGLBackend::swapBuffers() const
 {
        assert(context != EGL_NO_CONTEXT); // this implies the display is also initialized
-       eglSwapBuffers(display, surface);
+       if (eglSwapBuffers(display, surface) == EGL_FALSE)
+               exitEglError("Failed to swap buffers");
 }
 
 void EGLBackend::setSwapInterval(int i) const
 {
        assert(context != EGL_NO_CONTEXT);
-       eglSwapInterval(display, i);
+       // check if swap interval value is supported
+       EGLint val;
+       eglGetConfigAttrib(display, config, EGL_MIN_SWAP_INTERVAL, &val);
+       if (i < val) {
+               fprintf(stderr, "Cannot set swap interval to %d, minimum supported value is %d\n", i, val);
+               exit(1);
+       }
+       eglGetConfigAttrib(display, config, EGL_MAX_SWAP_INTERVAL, &val);
+       if (i > val) {
+               fprintf(stderr, "Cannot set swap interval to %d, maximum supported value is %d\n", i, val);
+               exit(1);
+       }
+       // use it
+       if (eglSwapInterval(display, i) == EGL_FALSE)
+               exitEglError("Failed to set swap interval");
 }