Playing around with shaders for effects on the scene.

animator.cpp

@@ -1,5 +1,7 @@
 #include "animator.hpp"
 #include "constants.hpp"
+#include <SFML/Audio.hpp>
+#include "dbc.hpp"
 
 void Animator::step(sf::Sprite& sprite, int rect_x, int rect_y, int rect_w, int rect_h) {
   if(playing) {
@@ -15,4 +17,5 @@ void Animator::step(sf::Sprite& sprite, int rect_x, int rect_y, int rect_w, int
 
 void Animator::play() {
   playing = true;
+  sound.play();
 }

animator.hpp

@@ -1,14 +1,25 @@
 #pragma once
 #include <SFML/Graphics/Sprite.hpp>
+#include <SFML/Audio.hpp>
+#include <string>
 
 struct Animator {
   int width = 0;
   int height = 0;
   int max_frames = 0;
+  sf::SoundBuffer buffer;
+  sf::Sound sound;
   size_t count = 0;
   int frame = 0;
   bool playing = false;
 
+  Animator(int w, int h, int max, std::string sound_file) :
+    width(w), height(h), max_frames(max),
+    buffer(sound_file),
+    sound(buffer)
+  {
+  }
+
   void step(sf::Sprite& sprite, int rect_x, int rect_y, int rect_w, int rect_h);
 
   void play();

main.cpp

@@ -52,6 +52,7 @@ int main() {
   Raycaster rayview(window, MAP, RAY_VIEW_WIDTH, RAY_VIEW_HEIGHT);
   rayview.set_position(RAY_VIEW_X, RAY_VIEW_Y);
   rayview.position_camera(player_x, player_y);
+  rayview.init_shaders();
 
   double moveSpeed = 0.1;
   double rotSpeed = 0.1;
@@ -95,6 +96,14 @@ int main() {
       stats.reset();
     }
 
+    if(sf::Keyboard::isKeyPressed(sf::Keyboard::Key::P)) {
+      if(rayview.$active_shader == nullptr) {
+        rayview.$active_shader = &rayview.$paused;
+      } else {
+        rayview.$active_shader = nullptr;
+      }
+    }
+
     if(sf::Mouse::isButtonPressed(sf::Mouse::Button::Left)) {
       rayview.$anim.play();
       rotation = -30.0f;

meson.build

@@ -16,6 +16,11 @@ json = dependency('nlohmann_json')
 opengl32 = cc.find_library('opengl32', required: true)
 winmm = cc.find_library('winmm', required: true)
 gdi32 = cc.find_library('gdi32', required: true)
+flac = dependency('flac')
+ogg = dependency('ogg')
+vorbis = dependency('vorbis')
+vorbisfile = dependency('vorbisfile')
+vorbisenc = dependency('vorbisenc')
 sfml_audio = dependency('sfml_audio')
 sfml_graphics = dependency('sfml_graphics')
 sfml_main = dependency('sfml_main')
@@ -29,6 +34,7 @@ endif
 
 dependencies = [
   fmt, json, opengl32, freetype2,
+  flac, ogg, vorbis, vorbisfile, vorbisenc,
   winmm, gdi32, sfml_audio, sfml_graphics,
   sfml_main, sfml_network, sfml_system,
   sfml_window, tracy

raycaster.cpp

@@ -36,7 +36,8 @@ Raycaster::Raycaster(sf::RenderWindow& window, Matrix &map, int width, int heigh
   $map(map),
   spriteOrder(NUM_SPRITES),
   spriteDistance(NUM_SPRITES),
-  ZBuffer(width)
+  ZBuffer(width),
+  $anim(256, 256, 10, "assets/monster-1.ogg")
 {
   $view_sprite.setPosition({0, 0});
   $pixels = make_unique<RGBA[]>($width * $height);
@@ -46,6 +47,13 @@ Raycaster::Raycaster(sf::RenderWindow& window, Matrix &map, int width, int heigh
   $view_texture.setSmooth(false);
 }
 
+void Raycaster::init_shaders() {
+  bool good = $paused.loadFromFile("shaders/modal.frag", sf::Shader::Type::Fragment);
+  dbc::check(good, "shader could not be loaded");
+  $paused.setUniform("offsetFactor", sf::Glsl::Vec2{0.01f, 0.01f});
+  $paused.setUniform("darkness", 0.01f);
+}
+
 void Raycaster::set_position(int x, int y) {
   $view_sprite.setPosition({(float)x, (float)y});
 }
@@ -58,7 +66,7 @@ void Raycaster::position_camera(float player_x, float player_y) {
 
 void Raycaster::draw_pixel_buffer() {
   $view_texture.update((uint8_t *)$pixels.get(), {(unsigned int)$width, (unsigned int)$height}, {0, 0});
-  $window.draw($view_sprite);
+  $window.draw($view_sprite, $active_shader);
 }
 
 void Raycaster::clear() {
@@ -152,7 +160,7 @@ void Raycaster::sprite_casting() {
       $anim.step(*sf_sprite, texX, texY, texX_end - texX, textureHeight);
       sf_sprite->setPosition({x, y});
 
-      $window.draw(*sf_sprite);
+      $window.draw(*sf_sprite, $active_shader);
     }
   }
 }

raycaster.hpp

@@ -44,7 +44,9 @@ struct Raycaster {
   std::vector<int> spriteOrder;
   std::vector<double> spriteDistance;
   std::vector<double> ZBuffer; // width
-  Animator $anim{256, 256, 10, 0};
+  Animator $anim;
+  sf::Shader $paused;
+  sf::Shader* $active_shader = nullptr;
 
   Raycaster(sf::RenderWindow& window, Matrix &map, int width, int height);
 
@@ -63,6 +65,8 @@ struct Raycaster {
   void position_camera(float player_x, float player_y);
 
   void set_position(int x, int y);
+  void init_shaders();
+
   inline size_t pixcoord(int x, int y) {
     if(!(x >=0 && x < $width)) {
       dbc::sentinel(fmt::format("pixcoord x={} but $width={}", x, $width));

shaders/modal.frag

@@ -0,0 +1,23 @@
+uniform sampler2D 	source;
+uniform sampler2D bloom;
+uniform vec2 		offsetFactor;
+uniform float darkness;
+
+void main()
+{
+	vec2 textureCoordinates = gl_TexCoord[0].xy;
+	vec4 color = vec4(0.0);
+	color += texture2D(source, textureCoordinates - 4.0 * offsetFactor) * 0.0162162162;
+	color += texture2D(source, textureCoordinates - 3.0 * offsetFactor) * 0.0540540541;
+	color += texture2D(source, textureCoordinates - 2.0 * offsetFactor) * 0.1216216216;
+	color += texture2D(source, textureCoordinates - offsetFactor) * 0.1945945946;
+	color += texture2D(source, textureCoordinates) * 0.2270270270;
+	color += texture2D(source, textureCoordinates + offsetFactor) * 0.1945945946;
+	color += texture2D(source, textureCoordinates + 2.0 * offsetFactor) * 0.1216216216;
+	color += texture2D(source, textureCoordinates + 3.0 * offsetFactor) * 0.0540540541;
+	color += texture2D(source, textureCoordinates + 4.0 * offsetFactor) * 0.0162162162;
+
+    vec4 sourceFragment = texture2D(source, gl_TexCoord[0].xy);
+    vec4 bloomFragment = texture2D(bloom, gl_TexCoord[0].xy);
+    gl_FragColor = color + sourceFragment - bloomFragment - darkness;
+}