From f0df5815c08101d1a07e271e9a4b9f51281d95f5 Mon Sep 17 00:00:00 2001
From: Quentin Bazin <quent42340@gmail.com>
Date: Mon, 29 Jun 2020 23:39:02 +0200
Subject: [PATCH] [GameState] Framebuffer is now resized when window size
 changes. [Framebuffer] Small fixes.

---
 resources/shaders/screen.f.glsl        | 60 +++++++++++++++++++++++++-
 source/client/graphics/Framebuffer.cpp | 25 +++++++++--
 source/client/graphics/Framebuffer.hpp |  9 +++-
 source/client/states/GameState.cpp     |  4 +-
 4 files changed, 89 insertions(+), 9 deletions(-)

diff --git a/resources/shaders/screen.f.glsl b/resources/shaders/screen.f.glsl
index b5bc3460..a3d06200 100644
--- a/resources/shaders/screen.f.glsl
+++ b/resources/shaders/screen.f.glsl
@@ -6,7 +6,63 @@ varying vec2 v_coord2d;
 uniform sampler2D screenTexture;
 
 void main() {
-	gl_FragColor = texture2D(screenTexture, v_texCoord);
-	/* gl_FragColor = vec4(vec3(1.0 - texture2D(screenTexture, v_texCoord)), 1.0); */
+	vec4 color = texture2D(screenTexture, v_texCoord);
+
+	// Grayscale
+	/* float average = (color.r + color.g + color.b) / 3.0; // Basic */
+	/* float average = 0.2126 * color.r + 0.7152 * color.g + 0.0722 * color.b; // More realistic */
+	/* color = vec4(average, average, average, 1.0); */
+
+	// Inverted colors
+	/* color = vec4(vec3(1.0 - texture2D(screenTexture, v_texCoord)), 1.0); */
+
+	gl_FragColor = color;
 }
 
+// const float offset = 1.0 / 300.0;
+//
+// void main() {
+// 	vec2 offsets[9] = vec2[](
+// 		vec2(-offset,  offset), // top-left
+// 		vec2( 0.0f,    offset), // top-center
+// 		vec2( offset,  offset), // top-right
+// 		vec2(-offset,  0.0f),   // center-left
+// 		vec2( 0.0f,    0.0f),   // center-center
+// 		vec2( offset,  0.0f),   // center-right
+// 		vec2(-offset, -offset), // bottom-left
+// 		vec2( 0.0f,   -offset), // bottom-center
+// 		vec2( offset, -offset)  // bottom-right
+// 	);
+//
+// 	// Sharpen
+// 	/* float kernel[9] = float[]( */
+// 	/* 	-1, -1, -1, */
+// 	/* 	-1,  9, -1, */
+// 	/* 	-1, -1, -1 */
+// 	/* ); */
+//
+// 	// Blur
+// 	/* float kernel[9] = float[]( */
+// 	/* 	1.0 / 16, 2.0 / 16, 1.0 / 16, */
+// 	/* 	2.0 / 16, 4.0 / 16, 2.0 / 16, */
+// 	/* 	1.0 / 16, 2.0 / 16, 1.0 / 16 */
+// 	/* ); */
+//
+// 	// Edge-detection
+// 	/* float kernel[9] = float[]( */
+// 	/* 	1,  1, 1, */
+// 	/* 	1, -8, 1, */
+// 	/* 	1,  1, 1 */
+// 	/* ); */
+//
+// 	vec3 sampleTex[9];
+// 	for(int i = 0; i < 9; i++) {
+// 		sampleTex[i] = vec3(texture2D(screenTexture, v_texCoord.st + offsets[i]));
+// 	}
+//
+// 	vec3 col = vec3(0.0);
+// 	for(int i = 0; i < 9; i++)
+// 		col += sampleTex[i] * kernel[i];
+//
+// 	gl_FragColor = vec4(col, 1.0);
+// }
diff --git a/source/client/graphics/Framebuffer.cpp b/source/client/graphics/Framebuffer.cpp
index 80a38073..f39dd9fd 100644
--- a/source/client/graphics/Framebuffer.cpp
+++ b/source/client/graphics/Framebuffer.cpp
@@ -30,6 +30,17 @@
 #include "Framebuffer.hpp"
 
 Framebuffer::Framebuffer(u16 width, u16 height) {
+	init(width, height);
+}
+
+Framebuffer::~Framebuffer() {
+	clear();
+}
+
+void Framebuffer::init(u16 width, u16 height) {
+	if (m_id)
+		clear();
+
 	glCheck(glGenFramebuffers(1, &m_id));
 	bind(this);
 
@@ -55,15 +66,21 @@ Framebuffer::Framebuffer(u16 width, u16 height) {
 	bind(nullptr);
 }
 
-Framebuffer::~Framebuffer() {
-	if (m_id)
+void Framebuffer::clear() {
+	if (m_id) {
 		glCheck(glDeleteFramebuffers(1, &m_id));
+		m_id = 0;
+	}
 
-	if (m_texid)
+	if (m_texid) {
 		glCheck(glDeleteTextures(1, &m_texid));
+		m_texid = 0;
+	}
 
-	if (m_rbo)
+	if (m_rbo) {
 		glCheck(glDeleteRenderbuffers(1, &m_rbo));
+		m_rbo = 0;
+	}
 }
 
 void Framebuffer::bind(const Framebuffer *framebuffer) {
diff --git a/source/client/graphics/Framebuffer.hpp b/source/client/graphics/Framebuffer.hpp
index 2fe0fe13..8d5fda61 100644
--- a/source/client/graphics/Framebuffer.hpp
+++ b/source/client/graphics/Framebuffer.hpp
@@ -29,12 +29,19 @@
 
 #include <gk/core/IntTypes.hpp>
 #include <gk/gl/OpenGL.hpp>
+#include <gk/utils/NonCopyable.hpp>
 
-class Framebuffer {
+class Framebuffer : public gk::NonCopyable {
 	public:
 		Framebuffer(u16 width, u16 height);
+		Framebuffer(Framebuffer &&) = default;
 		~Framebuffer();
 
+		Framebuffer &operator=(Framebuffer &&) = default;
+
+		void init(u16 width, u16 height);
+		void clear();
+
 		GLuint texid() const { return m_texid; }
 
 		static void bind(const Framebuffer *framebuffer);
diff --git a/source/client/states/GameState.cpp b/source/client/states/GameState.cpp
index 896e33fc..92f534cf 100644
--- a/source/client/states/GameState.cpp
+++ b/source/client/states/GameState.cpp
@@ -139,6 +139,8 @@ void GameState::onEvent(const sf::Event &event) {
 
 		m_camera.setAspectRatio((float)Config::screenWidth / Config::screenHeight);
 		m_hud.setup();
+
+		m_fbo.init(Config::screenWidth, Config::screenHeight);
 	}
 }
 
@@ -213,7 +215,6 @@ void GameState::draw(gk::RenderTarget &target, gk::RenderStates states) const {
 	// gk::Shader::bind(nullptr);
 
 	Framebuffer::bind(&m_fbo);
-	// glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 	glEnable(GL_DEPTH_TEST);
 
@@ -226,7 +227,6 @@ void GameState::draw(gk::RenderTarget &target, gk::RenderStates states) const {
 			target.draw(it.second, states);
 
 	Framebuffer::bind(nullptr);
-	// glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
 	glClear(GL_COLOR_BUFFER_BIT);
 
 	glDisable(GL_DEPTH_TEST);