From d5486a5af100fb37fac08b60d862ac14943853ce Mon Sep 17 00:00:00 2001
From: Peter Fors <peter.fors@mindkiller.com>
Date: Sat, 29 Mar 2025 20:11:56 +0100
Subject: add base code for windowing and opengl crt-shader.

---
 base/callbacks.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 base/callbacks.c

(limited to 'base/callbacks.c')

diff --git a/base/callbacks.c b/base/callbacks.c
new file mode 100644
index 0000000..c5397e9
--- /dev/null
+++ b/base/callbacks.c
@@ -0,0 +1,72 @@
+
+
+/* [=]===^=[ framebuffer_callback ]=================================================================^===[=] */
+static void framebuffer_callback(int32_t width, int32_t height) {
+	state.screen_width = width;
+	state.screen_height = height;
+	state.viewport.x = 0;
+	state.viewport.y = 0;
+	state.viewport.w = width;
+	state.viewport.h = height;
+
+	float current_aspect = (float)width / (float)height;
+
+	if(current_aspect > aspect_ratio) {					// Window is wider than the desired aspect ratio
+		float new_width = height * aspect_ratio;		// Compute new width based on the height and the desired aspect ratio
+		state.viewport.x = (width - new_width) / 2;
+		state.viewport.w = new_width;
+	} else if(current_aspect < aspect_ratio) {		// Window is taller than the desired aspect ratio
+		float new_height = width / aspect_ratio;		// Compute new height based on the width and the desired aspect ratio
+		state.viewport.y = (height - new_height) / 2;
+		state.viewport.h = new_height;
+	}
+}
+
+/* [=]===^=[ key_callback ]=================================================================^===[=] */
+static void key_callback(uint32_t key, uint32_t action, uint32_t mods) {
+
+	if(key == MKS_KEY_ESCAPE) {
+		if(action == MKS_PRESSED) {
+			mkfw_set_should_close(true);
+		}
+	}
+
+	if(action == MKS_RELEASED) {
+		switch(key) {
+			// Handle shader CRT emulation toggle
+			case MKS_KEY_F12: {
+				state.toggle_crt_emulation = !state.toggle_crt_emulation;
+			} break;
+
+			// Handle fullscreen toggle
+			case MKS_KEY_F11: {
+				if(!keyboard_state[MKS_KEY_SHIFT]) {
+					if(state.fullscreen) {
+						mkfw_fullscreen(false);
+						state.fullscreen = false;
+					} else {
+						mkfw_fullscreen(true);
+						state.fullscreen = true;
+					}
+				} else if(keyboard_state[MKS_KEY_SHIFT]) {
+#ifdef PROFILER
+					state.overlay = !state.overlay;
+#endif
+				}
+			} break;
+
+			default: break;
+		}
+	}
+}
+
+/* [=]===^=[ mouse_move_callback ]=================================================================^===[=] */
+static void mouse_move_callback(int32_t x, int32_t y) {
+	state.mouse_dx += x;
+	state.mouse_dy += y;
+}
+
+/* [=]===^=[ mouse_button_callback ]=================================================================^===[=] */
+static void mouse_button_callback(uint8_t button, int action) {
+	// printf("mouse_button\n");
+}
-- 
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