X-Git-Url: https://git.ralfj.de/gltest.git/blobdiff_plain/c4859cf18f397a5fda57e5719134dddbcb23ef2a..7204186779e096ceab7b39f54dcf6f606062f29b:/eglbackend.cpp

diff --git a/eglbackend.cpp b/eglbackend.cpp
index 2717b86..47e0384 100644
--- a/eglbackend.cpp
+++ b/eglbackend.cpp
@@ -24,8 +24,8 @@
 
 #include <EGL/eglext.h>
 
-#if !defined(CON_GL1) && !defined(CON_GLES2)
-#error "Valid GL contexts for EGL are: GL1, GLES2"
+#if !defined(CON_GL1) && !defined(CON_GL3) && !defined(CON_GLES2)
+#error "Valid GL contexts for EGL are: GL1, GL3, GLES2"
 #endif
 
 static const char *eglErrorToString(EGLint e)
@@ -66,6 +66,10 @@ static const EGLint configAttribs[] = {
 static const EGLint contextAttribs[] = {
 #ifdef CON_GLES2
 	EGL_CONTEXT_CLIENT_VERSION, 2,
+#elif CON_GL3
+	EGL_CONTEXT_MAJOR_VERSION_KHR, 3,
+	EGL_CONTEXT_MINOR_VERSION_KHR, 0,
+	EGL_CONTEXT_FLAGS_KHR, EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR,
 #endif
 	EGL_NONE
 };
@@ -81,9 +85,9 @@ VisualID EGLBackend::initialize(Display *xDisplay)
 		if (eglInitialize(display, &eglMajor, &eglMinor) == EGL_FALSE)
 			dieEgl("Failed to initialize EGL");
 		printf("Using EGL version: %d.%d\n", eglMajor, eglMinor);
-		if (eglMajor == 1 && eglMinor < 3) {
-			// Choosing the GL context version requires EGL 1.3
-			die("Need at least EGL 1.3 to function properly\n");
+		if (eglMajor == 1 && eglMinor < 4) {
+			// Choosing the GL context version requires EGL 1.3, creating an OpenGL 3 context requires EGL 1.4
+			die("Need at least EGL 1.4 to function properly\n");
 		}
 #ifdef CON_GLES2
 		if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE)
@@ -91,6 +95,12 @@ VisualID EGLBackend::initialize(Display *xDisplay)
 		if (eglBindAPI(EGL_OPENGL_API) == EGL_FALSE)
 #endif
 			dieEgl("Failed to bind API");
+		// check for the extension we need
+#ifdef CON_GL3
+		if (!haveEGLExtension("EGL_KHR_create_context")) {
+			die("Required EGL extension EGL_KHR_create_context is not supported\n");
+		}
+#endif
 		// get an appropriate config
 		EGLConfig configs[1];
 		EGLint count;
@@ -108,6 +118,13 @@ VisualID EGLBackend::initialize(Display *xDisplay)
 	return (VisualID)val;
 }
 
+bool EGLBackend::haveEGLExtension(const std::string &name)
+{
+	assert(display != EGL_NO_DISPLAY);
+	std::string extensions = eglQueryString(display, EGL_EXTENSIONS);
+	return (std::string(" "+extensions+" ").find(" "+name+" ") != std::string::npos);
+}
+
 void EGLBackend::createContext(Window window)
 {
 	assert(display != EGL_NO_DISPLAY && context == EGL_NO_CONTEXT);