From 7215fd5433ce5c4ec38ff84486a896320ed9dd90 Mon Sep 17 00:00:00 2001
From: maelstrom <maelstrom@maelstrom.dev>
Date: Fri, 27 Sep 2024 19:19:35 +0200
Subject: [PATCH] blu

---
 assets/shaders/orange.fs |  7 +++++
 assets/shaders/orange.vs |  7 +++++
 src/renderer.cpp         |  9 ++++++
 src/shader.cpp           | 62 ++++++++++++++++++++++++++++++++++++++++
 src/shader.h             | 11 +++++++
 5 files changed, 96 insertions(+)
 create mode 100644 assets/shaders/orange.fs
 create mode 100644 assets/shaders/orange.vs
 create mode 100644 src/shader.cpp
 create mode 100644 src/shader.h

diff --git a/assets/shaders/orange.fs b/assets/shaders/orange.fs
new file mode 100644
index 0000000..a9cb901
--- /dev/null
+++ b/assets/shaders/orange.fs
@@ -0,0 +1,7 @@
+#version 330 core
+
+out vec3 color;
+
+void main() {
+    color = vec3(0.2f, 0.2f, 0.8f);
+}
\ No newline at end of file
diff --git a/assets/shaders/orange.vs b/assets/shaders/orange.vs
new file mode 100644
index 0000000..a44d266
--- /dev/null
+++ b/assets/shaders/orange.vs
@@ -0,0 +1,7 @@
+#version 330 core
+
+in vec3 pos;
+
+void main() {
+    gl_Position = vec4(pos, 1.0f);
+}
\ No newline at end of file
diff --git a/src/renderer.cpp b/src/renderer.cpp
index 30c7bfa..b9d38c8 100644
--- a/src/renderer.cpp
+++ b/src/renderer.cpp
@@ -1,6 +1,8 @@
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 #include <GL/gl.h>
+#include <memory>
+#include "shader.h"
 
 #include "renderer.h"
 
@@ -11,6 +13,7 @@ float verts[] {
 };
 
 unsigned int VAO, VBO;
+Shader *shader = NULL;
 
 void renderInit(GLFWwindow* window) {
     glViewport(0, 0, 500, 500);
@@ -27,12 +30,18 @@ void renderInit(GLFWwindow* window) {
 
     glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
     glEnableVertexAttribArray(0);
+
+    // Compile shader
+    shader = new Shader("assets/shaders/orange.vs", "assets/shaders/orange.fs");
 }
 
 void render(GLFWwindow* window) {
     glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
+    // Use shader
+    shader->use();
+
     glBindVertexArray(VAO);
     glDrawArrays(GL_TRIANGLES, 0, 3);
 }
\ No newline at end of file
diff --git a/src/shader.cpp b/src/shader.cpp
new file mode 100644
index 0000000..4285033
--- /dev/null
+++ b/src/shader.cpp
@@ -0,0 +1,62 @@
+#include <fstream>
+#include <GL/glew.h>
+#include <GL/gl.h>
+
+#include "shader.h"
+
+std::string getContents(std::string filePath) {
+    std::ifstream ifs(filePath);
+    std::string content( (std::istreambuf_iterator<char>(ifs) ),
+                       (std::istreambuf_iterator<char>()    ) );
+
+    return content;
+}
+
+unsigned int compileShader(std::string path, GLenum type) {
+    int success;
+    unsigned int shader = glCreateShader(type);
+
+    std::string source = getContents(path);
+    const char* source2 = source.c_str();
+    glShaderSource(shader, 1, &source2, NULL);
+    glCompileShader(shader);
+    glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
+    if(success != 1) {
+        char infoLog[256];
+        glGetShaderInfoLog(shader, 512, NULL, infoLog);
+        printf("Fragment shader %s failed to compile: [%d]: %s\n", path.c_str(), success, infoLog);
+        abort();
+    }
+
+    return shader;
+}
+
+Shader::Shader(std::string vertexShaderPath, std::string fragmentShaderPath) {
+    unsigned int vertexShader = compileShader(vertexShaderPath, GL_VERTEX_SHADER);
+    unsigned int fragmentShader = compileShader(fragmentShaderPath, GL_FRAGMENT_SHADER);
+
+    int success;
+
+    id = glCreateProgram();
+    glAttachShader(id, vertexShader);
+    glAttachShader(id, fragmentShader);
+    glLinkProgram(id);
+    glGetProgramiv(id, GL_LINK_STATUS, &success);
+    if(success != 1) {
+        char infoLog[256];
+        glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
+        printf("Shader program failed to link: [%d]: %s\n", success, infoLog);
+        abort();
+    }
+
+    glDeleteShader(vertexShader);
+    glDeleteShader(fragmentShader);
+}
+
+Shader::~Shader() {
+    glDeleteProgram(id);
+}
+
+void Shader::use() {
+    glUseProgram(id);
+}
\ No newline at end of file
diff --git a/src/shader.h b/src/shader.h
new file mode 100644
index 0000000..e482036
--- /dev/null
+++ b/src/shader.h
@@ -0,0 +1,11 @@
+#pragma once
+#include <string>
+
+class Shader {
+    unsigned int id;
+
+public:
+    void use();
+    Shader(std::string vertexShaderPath, std::string fragmentShaderPath);
+    ~Shader();
+};
\ No newline at end of file