KlaoudeEngine/src/GLSLProgram.cpp at master · klaoude/KlaoudeEngine · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
#include "GLSLProgram.h"
#include "Errors.h"
#include "IOManager.h"

#include <vector>
#include <fstream>

namespace KlaoudeEngine
{

	GLSLProgram::GLSLProgram() : m_numAttributes(0), m_programID(0), m_vertexShaderID(0), m_fragmentShaderID(0)
	{

	}

	GLSLProgram::~GLSLProgram()
	{

	}

	void GLSLProgram::compileShaders(const std::string& vertexShaderFilePath, const std::string& fragementShaderFilePath)
	{
		std::string fragSource, vertSource;

		IOManager::readFileToBuffer(vertexShaderFilePath, vertSource);
		IOManager::readFileToBuffer(fragementShaderFilePath, fragSource);

		compileShadersFromSource(vertSource.c_str(), fragSource.c_str());
	}

	void GLSLProgram::compileShadersFromSource(const char* vertexSource, const char* fragmentSource)
	{
		m_programID = glCreateProgram();

		m_vertexShaderID = glCreateShader(GL_VERTEX_SHADER);
		if (m_vertexShaderID == 0)
			fatalError("Vertex shader dailed to be created");

		m_fragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
		if (m_fragmentShaderID == 0)
			fatalError("Fragment shader dailed to be created");

		compileShader(vertexSource, "Vertex Shader", m_vertexShaderID);
		compileShader(fragmentSource, "Fragment Shader", m_fragmentShaderID);
	}

	void GLSLProgram::linkShaders()
	{
		glAttachShader(m_programID, m_vertexShaderID);
		glAttachShader(m_programID, m_fragmentShaderID);

		glLinkProgram(m_programID);

		GLint isLinked = 0;
		glGetProgramiv(m_programID, GL_LINK_STATUS, (int*)&isLinked);
		if (isLinked == GL_FALSE)
		{
			GLint maxLenght = 0;
			glGetProgramiv(m_programID, GL_INFO_LOG_LENGTH, &maxLenght);

			std::vector<char> infoLog(maxLenght);
			glGetProgramInfoLog(m_programID, maxLenght, &maxLenght, &infoLog[0]);

			glDeleteShader(m_programID);
			glDeleteShader(m_vertexShaderID);
			glDeleteShader(m_fragmentShaderID);

			std::printf("%s\n", &(infoLog[0]));
			fatalError("Shaders failed to link !");
		}

		glDetachShader(m_programID, m_vertexShaderID);
		glDetachShader(m_programID, m_fragmentShaderID);
		glDeleteShader(m_vertexShaderID);
		glDeleteShader(m_fragmentShaderID);
	}

	void GLSLProgram::addAttribute(const std::string& attributeName)
	{
		glBindAttribLocation(m_programID, m_numAttributes++, attributeName.c_str());
	}

	GLint GLSLProgram::getUniformLocation(const std::string& uniformName)
	{
		GLint location = glGetUniformLocation(m_programID, uniformName.c_str());
		if (location == GL_INVALID_INDEX)
			fatalError("Uniform " + uniformName + " not found in shader !");
		return location;
	}

	void GLSLProgram::use()
	{
		glUseProgram(m_programID);
		for (int i = 0; i < m_numAttributes; i++)
		{
			glEnableVertexAttribArray(i);
		}
	}

	void GLSLProgram::unUse()
	{
		glUseProgram(0);
		for (int i = 0; i < m_numAttributes; i++)
		{
			glDisableVertexAttribArray(i);
		}
	}

	void GLSLProgram::dispose()
	{
		if(m_programID)
			glDeleteProgram(m_programID);
	}

	void GLSLProgram::compileShader(const char* source, const std::string& name, GLuint id)
	{
		glShaderSource(id, 1, &source, nullptr);

		glCompileShader(id);

		GLint success = 0;
		glGetShaderiv(id, GL_COMPILE_STATUS, &success);

		if (success == GL_FALSE)
		{
			GLint maxLenght = 0;
			glGetShaderiv(id, GL_INFO_LOG_LENGTH, &maxLenght);

			std::vector<char> errorLog(maxLenght);
			glGetShaderInfoLog(id, maxLenght, &maxLenght, &errorLog[0]);

			glDeleteShader(id);

			std::printf("%s\n", &(errorLog[0]));
			fatalError("Shader " + name + " failed to compile");
		}
	}
}