Move the graphics stuff out of main.

Makefile

@@ -15,13 +15,13 @@ debug_build:
 	meson compile -j 4 -C builddir
 
 run: build
-	./builddir/b8rk.exe 1 120 ./roms/tetris.ch8
+	./builddir/b8rk.exe 1 120 ./roms/pong.ch8
 
 debug: build
 	gdb --nx -x .gdbinit --ex run --args builddir/runtests.exe
 
 debug_run: build
-	gdb --nx -x .gdbinit --batch --ex run --ex bt --ex q --args builddir/b8rk.exe 1 120 ./roms/tetris.ch8
+	gdb --nx -x .gdbinit --batch --ex run --ex bt --ex q --args builddir/b8rk.exe 1 120 ./roms/pong.ch8
 
 clean:
 	meson compile --clean -C builddir

src/chip8.cpp

@@ -294,7 +294,10 @@ void Chip8::OP_Dxyn() {
 
     for(size_t col = 0; col < 8; ++col) {
       uint8_t spritePixel = spriteByte & (0x80u >> col);
-      uint32_t* screenPixel = &video[(yPos + row) * VIDEO_WIDTH + (xPos + col)];
+
+      size_t pixel_at = (yPos + row) * VIDEO_WIDTH + (xPos + col);
+
+      uint32_t* screenPixel = &video[pixel_at];
 
       // Sprite pixel is on
       if(spritePixel) {

src/chip8.hpp

@@ -24,7 +24,7 @@ class Chip8 {
     uint8_t delayTimer{};
     uint8_t soundTimer{};
     uint8_t keypad[16]{};
-    uint32_t video[64 * 32]{};
+    uint32_t video[VIDEO_WIDTH * VIDEO_HEIGHT]{};
     uint16_t opcode;
     uint8_t fontset[FONTSET_SIZE] =
     {

src/display.cpp

@@ -0,0 +1,55 @@
+#include "display.hpp"
+#include <SFML/Window/Event.hpp>
+#include <SFML/System.hpp>
+#include <SFML/Audio.hpp>
+
+Display::Display(sf::RenderWindow& window, sf::Vector2f pos, sf::Vector2f size) :
+  window(window)
+{
+  float border_width = 2.0f;
+  texture.setSmooth(false);
+
+  float ratio = (size.x - border_width * 2) / 64.0f;
+  // rectangle position doesn't include the border because everyone hates humans
+  sf::Vector2f border_pos{pos.x + border_width, pos.y + border_width};
+
+  sf::Vector2f scale{ratio, ratio};
+  // have to move in one more time for the border we just moved in for the border
+  texture_sprite.setPosition({border_pos.x + border_width, border_pos.y + border_width});
+  texture_sprite.setScale(scale);
+
+  border.setPosition(border_pos);
+  border.setSize({64 * ratio, 32 * ratio});
+  border.setOutlineColor({30,20,50,255});
+  border.setOutlineThickness(border_width);
+  border.setFillColor({0,0,0,255});
+}
+
+void Display::handle_inputs(Chip8& vm) {
+  while (const auto event = window.pollEvent()) {
+    if(event->is<sf::Event::Closed>()) {
+      window.close();
+    }
+
+    if(const auto* key = event->getIf<sf::Event::KeyPressed>()) {
+      vm.handle_keyboard(key->scancode, true);
+    } else if(const auto* key = event->getIf<sf::Event::KeyReleased>()) {
+      vm.handle_keyboard(key->scancode, false);
+    }
+  }
+}
+
+void Display::update(Chip8& vm) {
+  handle_inputs(vm);
+  texture.update((uint8_t *)(vm.video), {64, 32}, {0,0});
+}
+
+void Display::render() {
+  window.draw(border);
+  window.draw(texture_sprite);
+  window.display();
+}
+
+bool Display::active() {
+  return window.isOpen();
+}

src/display.hpp

@@ -0,0 +1,20 @@
+#pragma once
+#include <SFML/Graphics/Sprite.hpp>
+#include <SFML/Graphics/Texture.hpp>
+#include <SFML/Graphics/RenderWindow.hpp>
+#include <SFML/Graphics/RectangleShape.hpp>
+#include "chip8.hpp"
+
+struct Display {
+  sf::RenderWindow& window;
+  sf::Texture texture{sf::Vector2u{64,32}};
+  sf::Sprite texture_sprite{texture};
+  sf::RectangleShape border;
+
+  Display(sf::RenderWindow& window, sf::Vector2f pos, sf::Vector2f size);
+
+  void handle_inputs(Chip8& vm);
+  void update(Chip8& vm);
+  void render();
+  bool active();
+};

src/main.cpp

@@ -1,74 +1,11 @@
 #define _USE_MATH_DEFINES
 #include <math.h>
 #include <fmt/core.h>
-#include <SFML/Graphics/Sprite.hpp>
-#include <SFML/Graphics/Texture.hpp>
 #include <SFML/Graphics/RenderWindow.hpp>
-#include <SFML/System.hpp>
-#include <SFML/Audio.hpp>
-#include <SFML/Window/Event.hpp>
-#include <SFML/Graphics/RectangleShape.hpp>
 #include "dbc.hpp"
 #include "chip8.hpp"
 #include "stats.hpp"
-
-struct Display {
-  sf::RenderWindow& window;
-  sf::Texture texture{sf::Vector2u{64,32}};
-  sf::Sprite texture_sprite{texture};
-  sf::RectangleShape border;
-
-  Display(sf::RenderWindow& window, sf::Vector2f pos, sf::Vector2f size) :
-    window(window)
-  {
-    float border_width = 2.0f;
-    texture.setSmooth(false);
-
-    float ratio = (size.x - border_width * 2) / 64.0f;
-    // rectangle position doesn't include the border because everyone hates humans
-    sf::Vector2f border_pos{pos.x + border_width, pos.y + border_width};
-
-    sf::Vector2f scale{ratio, ratio};
-    // have to move in one more time for the border we just moved in for the border
-    texture_sprite.setPosition({border_pos.x + border_width, border_pos.y + border_width});
-    texture_sprite.setScale(scale);
-
-    border.setPosition(border_pos);
-    border.setSize({64 * ratio, 32 * ratio});
-    border.setOutlineColor({30,20,50,255});
-    border.setOutlineThickness(border_width);
-    border.setFillColor({0,0,0,255});
-  }
-
-  void handle_inputs(Chip8& vm) {
-    while (const auto event = window.pollEvent()) {
-      if(event->is<sf::Event::Closed>()) {
-        window.close();
-      }
-
-      if(const auto* key = event->getIf<sf::Event::KeyPressed>()) {
-        vm.handle_keyboard(key->scancode, true);
-      } else if(const auto* key = event->getIf<sf::Event::KeyReleased>()) {
-        vm.handle_keyboard(key->scancode, false);
-      }
-    }
-  }
-
-  void update(Chip8& vm) {
-    handle_inputs(vm);
-    texture.update((uint8_t *)(vm.video), {64, 32}, {0,0});
-  }
-
-  void render() {
-    window.draw(border);
-    window.draw(texture_sprite);
-    window.display();
-  }
-
-  bool active() {
-    return window.isOpen();
-  }
-};
+#include "display.hpp"
 
 int main(int argc, char* argv[]) {
   if(argc != 4) {

src/meson.build

@@ -3,4 +3,5 @@ sources = files(
   'dbc.cpp',
   'chip8.cpp',
   'stats.cpp',
+  'display.cpp',
 )