Add a framebuffer sample

Author: RobDangerous

framebuffer/deployment/.gitkeep

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+Don't read me, but please keep me.

framebuffer/kfile.js

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+const project = new Project('framebuffer');
+
+await project.addProject(findKore());
+
+project.addFile('sources/**');
+project.addKongDir('shaders');
+project.setDebugDir('deployment');
+
+if (Options.screenshot) {
+	project.addDefine('SCREENSHOT');
+	project.addDefine('KORE_D3D12_FORCE_WARP');
+}
+
+project.flatten();
+
+resolve(project);

framebuffer/shaders/.gitkeep

@@ -0,0 +1 @@
+Don't read me, but please keep me.

framebuffer/sources/main.c

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+#include <kore3/framebuffer/framebuffer.h>
+#include <kore3/system.h>
+
+#include <assert.h>
+#include <stdlib.h>
+
+#ifdef SCREENSHOT
+#include "../../screenshot.h"
+#endif
+
+static const uint32_t width  = 800;
+static const uint32_t height = 600;
+
+static uint32_t frame = 0;
+
+static void update(void *data) {
+	kore_fb_begin();
+
+	for (uint32_t y = 0; y < height; ++y) {
+		for (uint32_t x = 0; x < width; ++x) {
+			kore_fb_set_pixel(x, y, (frame + x) % 256, (frame + y) % 256, 0);
+		}
+	}
+
+	kore_fb_end();
+
+	++frame;
+}
+
+int kickstart(int argc, char **argv) {
+	kore_init("framebuffer", width, height, NULL, NULL);
+	kore_set_update_callback(update, NULL);
+
+	kore_fb_init(width, height);
+
+	kore_start();
+
+	return 0;
+}