From 43394c8a8908442982e3a7e25975c31b3c952923 Mon Sep 17 00:00:00 2001
From: Nikolas <nikolas@boutalas.com>
Date: Sun, 27 Oct 2024 12:52:55 +0200
Subject: root

---
 graphics/shader.cpp | 246 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 246 insertions(+)
 create mode 100644 graphics/shader.cpp

(limited to 'graphics/shader.cpp')

diff --git a/graphics/shader.cpp b/graphics/shader.cpp
new file mode 100644
index 0000000..8e1598f
--- /dev/null
+++ b/graphics/shader.cpp
@@ -0,0 +1,246 @@
+#include "shader.h"
+#include <GL/glew.h>
+#include <iostream>
+#include <glm/gtc/type_ptr.hpp>
+
+const char* __DefaultVertexShader = R"glsl(
+	#version 120
+    in vec3 position;
+	void main()
+    {
+        gl_Position = vec4(position, 1.0);
+    }
+)glsl";
+
+
+const char* __DefaultFragmentShader = R"glsl(
+	#version 120
+    out vec4 fragcolor;
+    void main()
+    {
+        fragcolor = vec4(0.0,1.0,0.0,1.0);
+    }
+)glsl";
+
+void Shader::printLog(unsigned int object)
+{
+	GLint log_length = 0;
+	if (glIsShader(object))
+		glGetShaderiv(object, GL_INFO_LOG_LENGTH, &log_length);
+	else if (glIsProgram(object))
+		glGetProgramiv(object, GL_INFO_LOG_LENGTH, &log_length);
+	else
+	{
+		printf("printlog: Not a shader or a program\n");
+		return;
+	}
+	if (log_length == 0)
+		return;
+
+	char* log = new char[log_length];
+
+	if (glIsShader(object))
+		glGetShaderInfoLog(object, log_length, NULL, log);
+	else if (glIsProgram(object))
+		glGetProgramInfoLog(object, log_length, NULL, log);
+
+	printf("%s", log);
+	delete[] log;
+}
+Shader::Shader(const char * vertex, const char * fragment)
+{
+
+	if (!vertex || !fragment)
+		return;
+
+	vshader = glCreateShader(GL_VERTEX_SHADER);
+	glShaderSource(vshader, 1, &vertex, NULL);
+
+	fshader = glCreateShader(GL_FRAGMENT_SHADER);
+	glShaderSource(fshader, 1, &fragment, NULL);
+
+	GLint status;
+
+	glCompileShader(vshader);
+	glGetShaderiv(vshader, GL_COMPILE_STATUS, &status);
+	if (!status)
+	{
+		printLog(vshader);
+		return;
+	}
+	glCompileShader(fshader);
+	glGetShaderiv(fshader, GL_COMPILE_STATUS, &status);
+	if (!status)
+	{
+		printLog(fshader);
+		return;
+	}
+
+	program = glCreateProgram();
+	glAttachShader(program, vshader);
+	glAttachShader(program, fshader);
+	glLinkProgram(program);
+	assert(glGetError() == GL_NO_ERROR);
+//	GLint status;
+
+	glGetProgramiv(program, GL_LINK_STATUS, &status);
+
+	if (!status)
+	{
+		printLog(program);
+		return;
+	}
+
+	glValidateProgram(program);
+
+	glGetProgramiv(program, GL_VALIDATE_STATUS, &status);
+	if (!status)
+	{
+		printLog(program);
+		return;
+	}
+
+}
+
+Uniform & Shader::operator[](const char * name)
+{
+	
+	auto iter = uniforms.find(name);
+	if (iter == uniforms.end())
+	{
+		Uniform uni = glGetUniformLocation(program, name);
+		
+		uniforms[name] = uni;
+		return uniforms[name];
+	}
+	else
+	{
+		return iter->second;
+	}	
+	
+}
+
+bool Shader::use(bool use)
+{
+	if (!ready)
+		return false;
+
+	if (use)
+		glUseProgram(program);
+	else
+		glUseProgram(0);
+
+	return true;
+}
+
+std::string Shader::loadShaderText(char * file)
+{
+	return std::string();
+}
+
+bool Shader::init()
+{
+	
+	
+	ready = true;
+	return true;
+}
+
+void Shader::setFragmentLocation(char * name, unsigned int location)
+{
+	glBindFragDataLocation(program, location, name);
+}
+
+unsigned int Shader::getAttributeLocation(const char * attrib)
+{
+	return glGetAttribLocation(program, attrib);
+}
+
+Shader::~Shader()
+{
+	glDetachShader(program, vshader);
+	glDeleteShader(vshader);
+	glDetachShader(program, fshader);
+	glDeleteShader(fshader);
+	
+}
+
+Uniform::Uniform(const Uniform & right)
+{
+	id = right.id;
+}
+
+Uniform & Uniform::operator=(const Uniform & right)
+{
+	id = right.id;
+	return *this;
+}
+
+Uniform & Uniform::operator=(int i)
+{
+	glUniform1i(this->id, i);
+	return *this;
+}
+
+Uniform & Uniform::operator=(float f)
+{
+	glUniform1f(this->id, f);
+	return *this;
+}
+
+Uniform & Uniform::operator=(unsigned int i)
+{
+	glUniform1ui(this->id, i);
+	return *this;
+}
+
+Uniform & Uniform::operator=(glm::vec3 v)
+{
+	glUniform3f(this->id, v.x, v.y, v.z);
+	int err = glGetError();
+	assert(err == GL_NO_ERROR);
+
+	return *this;
+}
+
+Uniform & Uniform::operator=(glm::vec4 v)
+{
+	glUniform4f(this->id, v.x, v.y, v.z, v.w);
+	return *this;
+}
+
+Uniform & Uniform::operator=(glm::vec2 v)
+{
+	glUniform2fv(this->id, 1, &(v[0]));
+	return *this;
+}
+
+Uniform & Uniform::operator=(glm::ivec3 v)
+{
+	glUniform3iv(this->id, 1, &(v[0]));
+	return *this;
+}
+
+Uniform & Uniform::operator=(glm::ivec2 v)
+{
+	glUniform2iv(this->id, 1, &(v[0]));
+	return *this;
+}
+
+Uniform & Uniform::operator=(glm::ivec4 v)
+{
+	glUniform4iv(this->id, 1, &(v[0]));
+	return *this;
+}
+
+Uniform & Uniform::operator=(glm::mat4 m)
+{
+	glUniformMatrix4fv(this->id, 1, false, &(m[0][0]));
+	return *this;
+}
+
+Uniform & Uniform::operator=(glm::mat3 m)
+{
+	glUniformMatrix3fv(this->id, 1, false, &(m[0][0]));
+	return *this;
+}
-- 
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