From bc34748107f1ed8608f5a665f34577764cc65bbb Mon Sep 17 00:00:00 2001
From: orangerot <orangerot@orangerot.dev>
Date: Tue, 14 Oct 2025 04:11:36 +0200
Subject: [PATCH] feat: mouse support

---
 game.c | 28 +++++++++++++++++++---------
 game.h |  6 ++++++
 main.c | 43 +++++++++++++++++++++++++++++++++++++------
 3 files changed, 62 insertions(+), 15 deletions(-)

diff --git a/game.c b/game.c
index 49f2feb..1cfc1a1 100644
--- a/game.c
+++ b/game.c
@@ -1,16 +1,15 @@
-
-#include <stdio.h>
 #include <glad/glad.h>
 #include <GLFW/glfw3.h>
-#include <math.h>
 
 #include "game.h"
 
-void character_callback(GLFWwindow* window, unsigned int codepoint) {
-  printf("%c\n", codepoint);
-}
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#define MAX(a,b) (((a)>(b))?(a):(b))
+#define CLAMP(x,a,b) (MIN(MAX(x,a),b))
 
-void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
+int mouse_x = 0, mouse_y = 0;
+
+void key_callback(int key, int scancode, int action, int mods) {
   if (action != GLFW_PRESS) return;
   switch (key) {
     case GLFW_KEY_ENTER:
@@ -20,6 +19,17 @@ void key_callback(GLFWwindow* window, int key, int scancode, int action, int mod
   }
 }
 
-void draw_image(decoded_image img) {
-  for (int i = 0; i < img.buf_size; i++) img.buf[i] = i;
+void cursor_position_callback(int xpos, int ypos) {
+  mouse_x = xpos;
+  mouse_y = ypos;
+}
+
+void mouse_button_callback(int button, int action, int mods) {
+    if (button == GLFW_MOUSE_BUTTON_RIGHT && action == GLFW_PRESS) {}
+}
+
+void draw_image(decoded_image img) {
+  // for (int i = 0; i < img.buf_size; i++) img.buf[i] = i;
+  img.buf[CLAMP(mouse_y, 0, img.height) * img.width +
+          CLAMP(mouse_x, 0, img.width)] = -1;
 }
diff --git a/game.h b/game.h
index b016ede..d24d2d7 100644
--- a/game.h
+++ b/game.h
@@ -2,9 +2,15 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#ifndef GAME_H
+#define GAME_H
+
 typedef struct decoded_image {
   size_t width;
   size_t height;
   uint32_t *buf;
   size_t buf_size;
 } decoded_image;
+
+#endif // GAME_H
+
diff --git a/main.c b/main.c
index d092082..78af96d 100644
--- a/main.c
+++ b/main.c
@@ -11,8 +11,9 @@
 unsigned int SCR_WIDTH = 800;
 unsigned int SCR_HEIGHT = 600;
 
-extern void character_callback(GLFWwindow* window, unsigned int codepoint);
-extern void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
+extern void key_callback(int key, int scancode, int action, int mods);
+extern void cursor_position_callback(int xpos, int ypos);
+extern void mouse_button_callback(int button, int action, int mods);
 extern void draw_image(decoded_image img);
 
 struct decoded_image canvas = {
@@ -53,14 +54,43 @@ const char *fragment_shader_source =
 
 
 void framebuffer_size_callback(GLFWwindow* window, int width, int height) {
+  (void) window;
+
   glViewport(0, 0, width, height);
   SCR_WIDTH = width;
   SCR_HEIGHT = height;
 }
 
-const uint32_t COLOR_RGBA = 0xFF21FF00;
+void glfw_key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
+  (void) window;
 
-int main(int argc, const char *argv[]) {
+  key_callback(key, scancode, action, mods);
+}
+
+void glfw_cursor_position_callback(GLFWwindow* window, double xpos, double ypos) {
+  (void) window;
+  printf("%f %f\n", xpos, ypos);
+
+  float scale_x = fmin(
+      (float) SCR_HEIGHT / SCR_WIDTH * (float) canvas.height / canvas.width,
+      1.0
+      );
+  float scale_y = fmin((float) SCR_WIDTH / SCR_HEIGHT * (float) canvas.width / canvas.height,
+      1.0
+      );
+  cursor_position_callback(
+      ((xpos - (SCR_WIDTH  - scale_x * SCR_WIDTH )/2) / (scale_x * SCR_WIDTH)) * canvas.width,
+      ((ypos - (SCR_HEIGHT - scale_y * SCR_HEIGHT)/2) / (scale_y * SCR_HEIGHT)) * canvas.height
+      );
+}
+
+
+void glfw_mouse_button_callback(GLFWwindow* window, int button, int action, int mods) {
+  (void) window;
+  mouse_button_callback(button, action, mods);
+}
+
+int main() {
 
   canvas.buf = malloc(canvas.buf_size * sizeof(int));
 
@@ -81,8 +111,9 @@ int main(int argc, const char *argv[]) {
   }
   glfwMakeContextCurrent(window);
   glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
-  glfwSetCharCallback(window, character_callback);
-  glfwSetKeyCallback(window, key_callback);
+  glfwSetKeyCallback(window, glfw_key_callback);
+  glfwSetCursorPosCallback(window, glfw_cursor_position_callback);
+  glfwSetMouseButtonCallback(window, glfw_mouse_button_callback);
 
   if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
     printf("Failed to initialize GLAD\n");