1 files changed, 141 insertions, 0 deletions
diff --git a/kmscube/cube-egl.cpp b/kmscube/cube-egl.cpp
new file mode 100644
index 0000000..8184a7d
--- /dev/null
+++ b/kmscube/cube-egl.cpp
@@ -0,0 +1,141 @@
+#include "cube-egl.h"
+#include "cube.h"
+
+#include <kms++util/kms++util.h>
+
+using namespace std;
+
+static void print_egl_config(EGLDisplay dpy, EGLConfig cfg)
+{
+	auto getconf = [dpy, cfg](EGLint a) { EGLint v = -1; eglGetConfigAttrib(dpy, cfg, a, &v); return v; };
+
+	printf("EGL Config %d: color buf %d/%d/%d/%d = %d, depth %d, stencil %d, native visualid %d, native visualtype %d\n",
+	       getconf(EGL_CONFIG_ID),
+	       getconf(EGL_ALPHA_SIZE),
+	       getconf(EGL_RED_SIZE),
+	       getconf(EGL_GREEN_SIZE),
+	       getconf(EGL_BLUE_SIZE),
+	       getconf(EGL_BUFFER_SIZE),
+	       getconf(EGL_DEPTH_SIZE),
+	       getconf(EGL_STENCIL_SIZE),
+	       getconf(EGL_NATIVE_VISUAL_ID),
+	       getconf(EGL_NATIVE_VISUAL_TYPE));
+}
+
+EglState::EglState(void* native_display) : EglState(native_display, 0) {}
+
+EglState::EglState(void* native_display, EGLint native_visual_id)
+	: m_native_visual_id(native_visual_id)
+{
+	EGLBoolean b;
+	EGLint major, minor, n;
+
+	static const EGLint context_attribs[] = {
+		EGL_CONTEXT_CLIENT_VERSION, 2,
+		EGL_NONE
+	};
+
+	static const EGLint config_attribs[] = {
+		EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+		EGL_RED_SIZE, 8,
+		EGL_GREEN_SIZE, 8,
+		EGL_BLUE_SIZE, 8,
+		EGL_ALPHA_SIZE, 0,
+		EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+		EGL_NONE
+	};
+
+	m_display = eglGetDisplay((EGLNativeDisplayType)native_display);
+	FAIL_IF(!m_display, "failed to get egl display");
+
+	b = eglInitialize(m_display, &major, &minor);
+	FAIL_IF(!b, "failed to initialize");
+
+	if (s_verbose) {
+		printf("Using display %p with EGL version %d.%d\n", m_display, major, minor);
+
+		printf("EGL_VENDOR:      %s\n", eglQueryString(m_display, EGL_VENDOR));
+		printf("EGL_VERSION:     %s\n", eglQueryString(m_display, EGL_VERSION));
+		printf("EGL_EXTENSIONS:  %s\n", eglQueryString(m_display, EGL_EXTENSIONS));
+		printf("EGL_CLIENT_APIS: %s\n", eglQueryString(m_display, EGL_CLIENT_APIS));
+	}
+
+	b = eglBindAPI(EGL_OPENGL_ES_API);
+	FAIL_IF(!b, "failed to bind api EGL_OPENGL_ES_API");
+
+	EGLint numConfigs;
+	b = eglGetConfigs(m_display, nullptr, 0, &numConfigs);
+	FAIL_IF(!b, "failed to get number of configs");
+
+	if (s_verbose) {
+		vector<EGLConfig> configs(numConfigs);
+		b = eglGetConfigs(m_display, configs.data(), numConfigs, &numConfigs);
+		FAIL_IF(!b, "failed to get configs");
+
+		printf("Available configs:\n");
+
+		for (int i = 0; i < numConfigs; ++i)
+			print_egl_config(m_display, configs[i]);
+	}
+
+	std::vector<EGLConfig> configs(numConfigs);
+	b = eglChooseConfig(m_display, config_attribs, configs.data(), numConfigs, &n);
+	FAIL_IF(!b || n < 1, "failed to choose config");
+
+	// elgChooseConfig does implement matching by EGL_NATIVE_VISUAL_ID, do a manual
+	// loop. Picks the first returned if native_visual_id is not set.
+	for (const auto& cfg : configs) {
+		EGLint id;
+		b = eglGetConfigAttrib(m_display, cfg, EGL_NATIVE_VISUAL_ID, &id);
+		if (!b) {
+			printf("failed to get native visual id\n");
+			continue;
+		}
+
+		if (id == native_visual_id || !native_visual_id) {
+			m_config = cfg;
+			break;
+		}
+	}
+
+	if (s_verbose) {
+		printf("Chosen config:\n");
+		print_egl_config(m_display, m_config);
+	}
+
+	m_context = eglCreateContext(m_display, m_config, EGL_NO_CONTEXT, context_attribs);
+	FAIL_IF(!m_context, "failed to create context");
+
+	EGLBoolean ok = eglMakeCurrent(m_display, EGL_NO_SURFACE, EGL_NO_SURFACE, m_context);
+	FAIL_IF(!ok, "eglMakeCurrent() failed");
+}
+
+EglState::~EglState()
+{
+	eglMakeCurrent(m_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+	eglTerminate(m_display);
+}
+
+EglSurface::EglSurface(const EglState& egl, void* native_window)
+	: egl(egl)
+{
+	esurface = eglCreateWindowSurface(egl.display(), egl.config(), (EGLNativeWindowType)native_window, NULL);
+	FAIL_IF(esurface == EGL_NO_SURFACE, "failed to create egl surface");
+}
+
+EglSurface::~EglSurface()
+{
+	eglDestroySurface(egl.display(), esurface);
+}
+
+void EglSurface::make_current()
+{
+	EGLBoolean ok = eglMakeCurrent(egl.display(), esurface, esurface, egl.context());
+	FAIL_IF(!ok, "eglMakeCurrent() failed");
+}
+
+void EglSurface::swap_buffers()
+{
+	EGLBoolean ok = eglSwapBuffers(egl.display(), esurface);
+	FAIL_IF(!ok, "eglMakeCurrent() failed");
+}