*/
#include "eglbackend.h"
+#include "glutil.h"
-#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <EGL/eglext.h>
+#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)
{
#define CASE(name) case name: return #name
#undef CASE
}
-static void exitEglError(const char *what)
+static void dieEgl(const char *what)
{
EGLint e = eglGetError();
- fprintf(stderr, "EGL error %d (%s): %s\n", e, eglErrorToString(e), what);
- exit(1);
+ die("EGL error %d (%s): %s\n", e, eglErrorToString(e), what);
}
-/* attributes for a double buffered visual in RGBA format with at least
-* 4 bits per color */
-static const EGLint config_attribs[] = {
+static const EGLint configAttribs[] = {
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,
};
+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
+};
VisualID EGLBackend::initialize(Display *xDisplay)
{
// get connection and bind API
EGLint eglMajor, eglMinor;
display = eglGetDisplay(xDisplay);
- if (display == EGL_NO_DISPLAY)
- exitEglError("Failed to get EGL display");
- 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 (display == EGL_NO_DISPLAY)
+ dieEgl("Failed to get EGL display");
+ 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 < 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)
+#else
+ 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;
- if (eglChooseConfig(display, config_attribs, configs, 1, &count) == EGL_FALSE || count == 0)
- exitEglError("Failed to choose config");
+ if (eglChooseConfig(display, configAttribs, configs, 1, &count) == EGL_FALSE){
+ dieEgl("Failed to choose framebuffer configuration");
+ }
+ if (count == 0) {
+ die("Found no matching framebuffer configuration\n");
+ }
config = configs[0];
}
// return visual ID
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);
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, contextAttribs);
if (context == EGL_NO_CONTEXT)
- exitEglError("Failed to create context");
+ dieEgl("Failed to create context");
if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE)
- exitEglError("Failed to make context current");
+ dieEgl("Failed to make context current");
+ printf("Using GL version: %s\n", glGetString(GL_VERSION));
+ // initialise GL utilities
+ resolveFunctionPointers(eglGetProcAddress);
}
EGLBackend::~EGLBackend()
{
assert(context != EGL_NO_CONTEXT); // this implies the display is also initialized
if (eglSwapBuffers(display, surface) == EGL_FALSE)
- exitEglError("Failed to swap buffers");
+ dieEgl("Failed to swap buffers");
}
void EGLBackend::setSwapInterval(int i) const
{
assert(context != EGL_NO_CONTEXT);
// 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);
+ if (i < 0) {
+ die("Cannot set swap interval to %d, must not be negative\n", i);
}
+ EGLint val;
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);
+ die("Cannot set swap interval to %d, maximum supported value is %d\n", i, val);
}
// use it
if (eglSwapInterval(display, i) == EGL_FALSE)
- exitEglError("Failed to set swap interval");
+ dieEgl("Failed to set swap interval");
}
projects / gltest.git / blobdiff