Support for multiple windows (debugging)

gui/CMakeLists.txt

@@ -1,5 +1,5 @@
-set(HEADERS canvas.h gui.h)
-set(SOURCE canvas.c gui.c)
+set(HEADERS canvas.h gui.h window.h)
+set(SOURCE canvas.c gui.c window.c)
 
 add_library(nes_gui ${SOURCE} ${HEADERS})
 

gui/canvas.c

@@ -4,18 +4,40 @@
 
 #include <assert.h>
 #include <string.h>
+#include <stdlib.h>
 #include "canvas.h"
 
+Canvas canvas_init(int width, int height) {
+    assert(width > 0);
+    assert(height > 0);
+
+    Canvas canvas;
+    canvas.width = width;
+    canvas.height = height;
+
+    int size = width * height;
+    canvas.pixels = malloc(sizeof(Pixel) * size);
+
+    return canvas;
+}
+
+void canvas_uninit(Canvas *canvas) {
+    assert(canvas != NULL);
+    assert(canvas->pixels != NULL);
+
+    free(canvas->pixels);
+}
+
 void canvas_draw(Canvas *canvas, Pixel pixel, int x, int y) {
     assert(x >= 0);
-    assert(x < CANVAS_WIDTH);
+    assert(x < canvas->width);
     assert(y >= 0);
-    assert(y < CANVAS_HEIGHT);
+    assert(y < canvas->height);
 
-    int pixel_index = CANVAS_INDEX(x, y);
+    int pixel_index = x + y * canvas->width;
     canvas->pixels[pixel_index] = pixel;
 }
 
 void canvas_reset(Canvas *canvas) {
-    memset(canvas->pixels, 0, sizeof(Pixel) * CANVAS_PIXEL_COUNT);
+    memset(canvas->pixels, 0, sizeof(Pixel) * (canvas->width * canvas->height));
 }

gui/canvas.h

@@ -7,11 +7,8 @@
 
 #include "../include/types.h"
 
-#define CANVAS_WIDTH 256
-#define CANVAS_HEIGHT 240
-#define CANVAS_PIXEL_COUNT (CANVAS_WIDTH * CANVAS_HEIGHT)
-
-#define CANVAS_INDEX(x, y) (y * CANVAS_WIDTH + x)
+//#define CANVAS_WIDTH 256
+//#define CANVAS_HEIGHT 240
 
 typedef struct pixel {
     byte r;
@@ -20,9 +17,14 @@ typedef struct pixel {
 } Pixel;
 
 typedef struct canvas {
-    Pixel pixels[CANVAS_PIXEL_COUNT];
+    int width;
+    int height;
+    Pixel *pixels;
 } Canvas;
 
+Canvas canvas_init(int width, int height);
+void canvas_uninit(Canvas *canvas);
+
 void canvas_draw(Canvas *canvas, Pixel pixel, int x, int y);
 void canvas_reset(Canvas *canvas);
 

gui/gui.c

@@ -2,84 +2,58 @@
 // Created by william on 16/05/24.
 //
 
+#include <assert.h>
 #include "gui.h"
 #include "log.h"
 
 NesGui gui;
 
-int gui_init() {
-    int renderer_flags = SDL_RENDERER_ACCELERATED;
-    int window_flags = 0;
+void gui_init() {
+    gui.main_window = window_init(MAIN_WINDOW_WIDTH, MAIN_WINDOW_HEIGHT, "NES Emulator");
+    gui.debug_pattern_window = window_init(DEBUG_PATTERN_WIDTH, DEBUG_PATTERN_HEIGHT, "Pattern Table");
+}
 
-    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
-        log_error("Couldn't initialize SDL: %s", SDL_GetError());
-        return -1;
-    }
-
-    gui.window = SDL_CreateWindow("NES Emulator", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, GUI_WIDTH,
-                                  GUI_HEIGHT, window_flags);
-    if (!gui.window) {
-        log_error("Failed to open %d x %d window: %s", GUI_WIDTH, GUI_HEIGHT, SDL_GetError());
-        return -1;
-    }
-
-    SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
-
-    gui.renderer = SDL_CreateRenderer(gui.window, -1, renderer_flags);
-    if (!gui.renderer) {
-        log_error("Failed to create renderer: %s\n", SDL_GetError());
-        return -1;
-    }
-
-    return 1;
+void gui_uninit() {
+    window_uninit(&gui.main_window);
+    window_uninit(&gui.debug_pattern_window);
 }
 
 int gui_input() {
     SDL_Event event;
 
     while (SDL_PollEvent(&event)) {
-        switch (event.type) {
-            case SDL_QUIT:
+        if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE) {
             return -1;
-            default:
-                break;
         }
     }
 
     return 1;
 }
 
-void gui_prepare() {
-    SDL_SetRenderDrawColor(gui.renderer, 96, 128, 255, 255);
-    SDL_RenderClear(gui.renderer);
-}
-
 void gui_render() {
-    for (int x = 0; x < CANVAS_WIDTH; x++) {
-        for (int y = 0; y < CANVAS_HEIGHT; y++) {
-            int pixel_index = CANVAS_INDEX(x, y);
-            Pixel pixel = gui.canvas.pixels[pixel_index];
-
-            SDL_SetRenderDrawColor(gui.renderer, pixel.r, pixel.g, pixel.b, 255);
-
-            for (int i = 0; i < GUI_SCALING; i++) {
-                for (int j = 0; j < GUI_SCALING; j++) {
-                    int scaled_x = x * GUI_SCALING + i;
-                    int scaled_y = y * GUI_SCALING + j;
-                    SDL_RenderDrawPoint(gui.renderer, scaled_x, scaled_y);
-                }
-            }
-        }
-    }
+    window_render(&gui.main_window);
+    window_render(&gui.debug_pattern_window);
 }
 
 void gui_present() {
-    SDL_RenderPresent(gui.renderer);
+    window_present(&gui.main_window);
+    window_present(&gui.debug_pattern_window);
 }
 
-void gui_uninit() {
-}
+Canvas *gui_get_canvas(char win_id) {
+    NesWindow *window;
 
-Canvas *gui_get_canvas() {
-    return &gui.canvas;
+    switch (win_id) {
+        case GUI_WINDOW_MAIN:
+            window = &gui.main_window;
+            break;
+        case GUI_WINDOW_PATTERN:
+            window = &gui.debug_pattern_window;
+            break;
+        default:
+            log_error("Couldn't get canvas for window ID '%d' because it doesn't exists", win_id);
+            assert(false);
+    }
+
+    return &window->canvas;
 }

gui/gui.h

@@ -7,24 +7,28 @@
 
 #include <SDL.h>
 #include "canvas.h"
+#include "window.h"
 
-#define GUI_SCALING 3
-#define GUI_WIDTH CANVAS_WIDTH * GUI_SCALING
-#define GUI_HEIGHT CANVAS_HEIGHT * GUI_SCALING
+#define MAIN_WINDOW_WIDTH 256
+#define MAIN_WINDOW_HEIGHT 240
+#define DEBUG_PATTERN_WIDTH 100
+#define DEBUG_PATTERN_HEIGHT 100
+
+#define GUI_WINDOW_MAIN 1
+#define GUI_WINDOW_PATTERN 2
 
 typedef struct nes_gui {
-    SDL_Renderer *renderer;
-    SDL_Window *window;
-    Canvas canvas;
+    NesWindow main_window;
+    NesWindow debug_pattern_window;
 } NesGui;
 
-int gui_init();
-int gui_input();
-void gui_prepare();
-void gui_render();
-void gui_present();
+void gui_init();
 void gui_uninit();
 
-Canvas *gui_get_canvas();
+int gui_input();
+void gui_render();
+void gui_present();
+
+Canvas *gui_get_canvas(char win_id);
 
 #endif //NES_EMULATOR_GUI_H

gui/window.c

@@ -0,0 +1,67 @@
+//
+// Created by william on 17/05/24.
+//
+
+#include "window.h"
+#include "log.h"
+
+NesWindow window_init(int width, int height, char *title) {
+    NesWindow win;
+    win.width = width * WINDOW_SCALING;
+    win.height = height * WINDOW_SCALING;
+    win.canvas = canvas_init(width, height);
+
+    int renderer_flags = SDL_RENDERER_ACCELERATED;
+    int window_flags = 0;
+
+    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+        log_error("Couldn't initialize SDL: %s", SDL_GetError());
+        exit(-1);
+    }
+
+    win.window = SDL_CreateWindow(title, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, win.width, win.height,
+                                  window_flags);
+    if (!win.window) {
+        log_error("Failed to open %d x %d window: %s", win.width, win.height, SDL_GetError());
+        exit(-1);
+    }
+
+    SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
+
+    win.renderer = SDL_CreateRenderer(win.window, -1, renderer_flags);
+    if (!win.renderer) {
+        log_error("Failed to create renderer: %s\n", SDL_GetError());
+        exit(-1);
+    }
+
+    return win;
+}
+
+void window_uninit(NesWindow *window) {
+    canvas_uninit(&window->canvas);
+}
+
+void window_render(NesWindow *window) {
+    SDL_RenderClear(window->renderer);
+
+    for (int x = 0; x < window->canvas.width; x++) {
+        for (int y = 0; y < window->canvas.height; y++) {
+            int pixel_index = x + y * window->canvas.width;
+            Pixel pixel = window->canvas.pixels[pixel_index];
+
+            SDL_SetRenderDrawColor(window->renderer, pixel.r, pixel.g, pixel.b, 255);
+
+            for (int i = 0; i < WINDOW_SCALING; i++) {
+                for (int j = 0; j < WINDOW_SCALING; j++) {
+                    int scaled_x = x * WINDOW_SCALING + i;
+                    int scaled_y = y * WINDOW_SCALING + j;
+                    SDL_RenderDrawPoint(window->renderer, scaled_x, scaled_y);
+                }
+            }
+        }
+    }
+}
+
+void window_present(NesWindow *window) {
+    SDL_RenderPresent(window->renderer);
+}

gui/window.h

@@ -0,0 +1,28 @@
+//
+// Created by william on 17/05/24.
+//
+
+#ifndef NES_EMULATOR_WINDOW_H
+#define NES_EMULATOR_WINDOW_H
+
+#include <SDL.h>
+#include "canvas.h"
+
+#define WINDOW_SCALING 3
+
+typedef struct new_window {
+    SDL_Renderer *renderer;
+    SDL_Window *window;
+
+    int width;
+    int height;
+    Canvas canvas;
+} NesWindow;
+
+NesWindow window_init(int width, int height, char *title);
+void window_uninit(NesWindow *window);
+
+void window_render(NesWindow *window);
+void window_present(NesWindow *window);
+
+#endif //NES_EMULATOR_WINDOW_H

main.c

@@ -39,8 +39,6 @@ int main() {
 
     bool stop = false;
     while (!stop) {
-        gui_prepare();
-
         if (gui_input() < 0) {
             stop = true;
         }

utils/linked_list.c

@@ -92,11 +92,6 @@ LinkedListNode *linked_list_get_near(LinkedList *list, int(*compute_distance)(vo
 
     LinkedListNode *near_node = list->head;
 
-//    int current_distance = compute_distance(near_node->data, userdata);
-//    if (current_distance == 0) {
-//        return near_node;
-//    }
-
     int current_distance = 0x7fffffff;
     while (near_node->next != NULL && current_distance != 0) {
         int next_distance = compute_distance(near_node->next->data, userdata);