From 533abb2b643a0f8e1d41e0d570e08e3df5339f80 Mon Sep 17 00:00:00 2001
From: Joursoir <chat@joursoir.net>
Date: Tue, 23 Mar 2021 08:45:12 +0000
Subject: add shader subsystem

---
 src/graphics/Shader.cpp | 60 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/graphics/Shader.hpp | 31 +++++++++++++++++++++++++
 2 files changed, 91 insertions(+)
 create mode 100644 src/graphics/Shader.cpp
 create mode 100644 src/graphics/Shader.hpp

diff --git a/src/graphics/Shader.cpp b/src/graphics/Shader.cpp
new file mode 100644
index 0000000..35a451d
--- /dev/null
+++ b/src/graphics/Shader.cpp
@@ -0,0 +1,60 @@
+#include <GL/glew.h>
+
+#include "Shader.hpp"
+
+Shader::~Shader()
+{
+	if(shader_id)
+		glDeleteShader(shader_id);
+	if(error_log)
+		delete[] error_log;
+}
+
+int Shader::Compile(const char *source, GLenum shaderType)
+{
+	GLint success;
+
+	shader_id = glCreateShader(shaderType);
+	glShaderSource(shader_id, 1, &source, NULL);
+	glCompileShader(shader_id);
+	glGetShaderiv(shader_id, GL_COMPILE_STATUS, &success);
+	if(success == 0) {
+		error_log = new char[GL_INFO_LOG_LENGTH];
+		glGetShaderInfoLog(shader_id, GL_INFO_LOG_LENGTH, NULL, error_log);
+		return 1;
+	}
+	return 0;
+}
+
+////////////////////////////////////////////////////////////////////
+
+ShaderManager::~ShaderManager()
+{
+	if(program_id)
+		glDeleteProgram(program_id);
+	if(error_log)
+		delete[] error_log;
+}
+
+int ShaderManager::Link(Shader *arr, int nsize)
+{
+	GLint success;
+	int i;
+
+	program_id = glCreateProgram();
+	for(i = 0; i < nsize; i++)
+		glAttachShader(program_id, arr[i].GetID());
+	glLinkProgram(program_id);
+	glGetProgramiv(program_id, GL_LINK_STATUS, &success);
+	if(success == 0) {
+		error_log = new char[GL_INFO_LOG_LENGTH];
+		glGetProgramInfoLog(program_id, GL_INFO_LOG_LENGTH, NULL, error_log);
+		return 1;
+	}
+	return 0;
+}
+
+void ShaderManager::Use()
+{
+	glUseProgram(program_id);
+}
diff --git a/src/graphics/Shader.hpp b/src/graphics/Shader.hpp
new file mode 100644
index 0000000..81841ad
--- /dev/null
+++ b/src/graphics/Shader.hpp
@@ -0,0 +1,31 @@
+#ifndef ENGINE_SHADER_H
+#define ENGINE_SHADER_H
+
+class Shader {
+	GLuint shader_id;
+	GLchar *error_log;
+
+public:
+	Shader() : shader_id(0), error_log(0) { }
+	~Shader();
+
+	int Compile(const char *source, GLenum shaderType);
+	char *GetError() { return error_log; }
+	GLuint GetID() { return shader_id; }
+};
+
+class ShaderManager {
+	GLuint program_id;
+	GLchar *error_log;
+
+public:
+	ShaderManager() : program_id(0), error_log(0) { }
+	~ShaderManager();
+
+	int Link(Shader *arr, int nsize);
+	char *GetError() { return error_log; }
+	GLuint GetID() { return program_id; }
+	void Use();
+};
+
+#endif /* ENGINE_SHADER_H */
-- 
cgit v1.2.3-18-g5258