From b46a0d9369fbaa1938f0968ab216bc2d564a9c37 Mon Sep 17 00:00:00 2001
From: fschildt <florian.schildt@protonmail.com>
Date: Mon, 21 Jul 2025 16:07:28 +0200
Subject: first commit

---
 src/renderer/opengl/GlShader.cpp | 80 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 src/renderer/opengl/GlShader.cpp

(limited to 'src/renderer/opengl/GlShader.cpp')

diff --git a/src/renderer/opengl/GlShader.cpp b/src/renderer/opengl/GlShader.cpp
new file mode 100644
index 0000000..cf7c6c5
--- /dev/null
+++ b/src/renderer/opengl/GlShader.cpp
@@ -0,0 +1,80 @@
+#include <renderer/opengl/GlShader.hpp>
+#include <GL/glew.h>
+#include <stdio.h>
+
+static const char *s_vertex_shader_src = 
+"#version 330 core\n"
+"layout (location = 0) in vec3 aPos;\n"
+"layout (location = 1) in vec3 aColor;\n"
+"\n"
+"out vec4 vertexColor;\n"
+"\n"
+"void main()\n"
+"{\n"
+"    gl_Position = vec4(aPos.xy, 0.0, 1.0);\n"
+"    vertexColor = vec4(aColor, 1.0);\n"
+"}\n"
+;
+
+static const char *s_fragment_shader_src =
+"#version 330 core\n"
+"in vec4 vertexColor;\n"
+"\n"
+"out vec4 FragColor;\n"
+"\n"
+"void main()\n"
+"{\n"
+"    FragColor = vertexColor;\n"
+"}\n"
+;
+
+bool GlShader::InitProgram() {
+    GLuint vertex_shader;
+    GLuint fragment_shader;
+    if (!CompileShader(&vertex_shader, s_vertex_shader_src, GL_VERTEX_SHADER) ||
+        !CompileShader(&fragment_shader, s_fragment_shader_src, GL_FRAGMENT_SHADER)) {
+        return false;
+    }
+
+    GLuint program = glCreateProgram();
+    glAttachShader(program, vertex_shader);
+    glAttachShader(program, fragment_shader);
+    glLinkProgram(program);
+
+    glDeleteShader(vertex_shader);
+    glDeleteShader(fragment_shader);
+
+    int success;
+    char info_log[512];
+    glGetProgramiv(program, GL_LINK_STATUS, &success);
+    if (!success) {
+        printf("error linking shader program\n%s\n", info_log);
+        return false;
+    }
+
+    m_ProgramId = program;
+    return true;
+}
+
+void GlShader::UseProgram() {
+    glUseProgram(m_ProgramId);
+}
+
+bool GlShader::CompileShader(GLuint *id, const char *src, GLenum type) {
+    GLuint shader = glCreateShader(type);
+    glShaderSource(shader, 1, &src, 0);
+    glCompileShader(shader);
+
+    int  success;
+    char info_log[512];
+    glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
+    if(!success) {
+        glGetShaderInfoLog(shader, 512, 0, info_log);
+        printf("error %s shader compilation failed\n%s\n", type == GL_VERTEX_SHADER ? "vertex" : "fragment", info_log);
+        glDeleteShader(shader);
+        return false;
+    }
+
+    *id = shader;
+    return true;
+}
-- 
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