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
139
140
141
142
143
144
145
146
|
/**
* @file shader.cpp
*
* Copyright (C) 2019 Belle-Isle, Andrew <drumsetmonkey@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <shader.hpp>
#include <fstream>
#include <iostream>
#include <vector>
#include <SDL2/SDL.h>
/*************
* PRIVATE *
*************/
std::string Shader::readShader(std::string filepath)
{
std::string contents = "";
std::ifstream file(filepath, std::ios::in);
if (!file.is_open()) {
std::cerr << "Could not read shader " << filepath <<
". Shader doesn't exist" << std::endl;
return "";
}
std::string line = "";
while (!file.eof()) {
std::getline(file, line);
contents.append(line + "\n");
}
file.close();
return contents;
}
GLuint Shader::createShader(std::string filepath, GLenum shaderType)
{
GLuint shader = glCreateShader(shaderType);
std::string shaderStr = readShader(filepath);
const char* shaderSrc = shaderStr.c_str();
GLint result = GL_FALSE;
int logLength;
glShaderSource(shader, 1, &shaderSrc, NULL);
glCompileShader(shader);
glGetShaderiv(shader, GL_COMPILE_STATUS, &result);
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLength);
std::vector<char> shaderError((logLength > 1) ? logLength : 1);
glGetShaderInfoLog(shader, logLength, NULL, &shaderError[0]);
std::cerr << &shaderError[0] << std::endl;
return shader;
}
/************
* PUBLIC *
************/
GLuint Shader::createProgram(std::string vertexPath, std::string fragmentPath)
{
GLuint vertex = createShader(vertexPath, GL_VERTEX_SHADER);
GLuint fragment = createShader(fragmentPath, GL_FRAGMENT_SHADER);
GLuint program = glCreateProgram();
glAttachShader(program, vertex);
glAttachShader(program, fragment);
glLinkProgram(program);
GLint result = GL_FALSE;
int logLength;
glGetProgramiv(program, GL_COMPILE_STATUS, &result);
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
std::vector<char> programError((logLength > 1) ? logLength : 1);
glGetProgramInfoLog(program, logLength, NULL, &programError[0]);
std::cerr << &programError[0] << std::endl;
glDeleteShader(vertex);
glDeleteShader(fragment);
this->program = program;
return program;
}
// TODO exceptions
GLint Shader::addAttribute(std::string attrib)
{
GLint attribute = glGetAttribLocation(program, attrib.c_str());
if (attribute == -1)
SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_ERROR,
"Could not bind attribute %s", attrib.c_str());
attributes.emplace(attrib, attribute);
return attribute;
}
GLint Shader::addUniform(std::string unfi)
{
GLint uniform = glGetUniformLocation(program, unfi.c_str());
if (uniform == -1)
SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_ERROR,
"Could not bind uniform %s", unfi.c_str());
uniforms.emplace(unfi, uniform);
return uniform;
}
// TODO exceptions
GLint Shader::getAttribute(std::string attrib)
{
return attributes.at(attrib);
}
GLint Shader::getUniform(std::string unfi)
{
return uniforms.at(unfi);
}
GLuint Shader::getProgram()
{
return program;
}
|
