LoG/Shaders.cpp at main · Autocrat/LoG · 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
#include "Shaders.h"
#include <iostream>

Shaders::Shaders()
{
  BlockShader();
  PortalShader();
}


void Shaders::BlockShader()
{
    const char *vertexShaderSource =  // "#version 330 core\n"
      "attribute vec3 aPos;\n"
      "uniform vec3 uColor;\n"
      "uniform mat4 mvp;\n"
      "varying vec3 vColor;\n"
      "void main()\n"
      "{\n"
      "   vColor=uColor;\n"
      "   gl_Position = mvp * vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
      "}\0";

    const char *fragmentShaderSource =  // "#version 330 core\n"
      "varying mediump vec3 vColor;\n"
      "void main()\n"
      "{\n"
      "   gl_FragColor = vec4(vColor, 1.0);\n"
      "}\n\0";


    compileShader(vertexShaderSource, fragmentShaderSource,"basic");
}


void Shaders::PortalShader()
{
  const char *vertexShaderSource = // "#version 330 core\n"
      "attribute vec3 aPos;\n"
      "uniform mat4 mvp;\n"
      "void main()\n"
      "{\n"
      "   gl_Position = mvp * vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
      "}\0";

  const char *fragmentShaderSource = // "#version 330 core\n"
    "void main()\n"
    "{\n"
    "   gl_FragColor = vec4(1.0f, 0.5f, 1.0f, 1.0f);\n"
    "}\n\0";

    compileShader(vertexShaderSource, fragmentShaderSource,"portal");

}


bool Shaders::compileShader(const char* vertexShaderSource,
                     const char* fragmentShaderSource,
                     const char* shaderName)
{
    int vertexShader = glCreateShader(GL_VERTEX_SHADER);
    glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
    glCompileShader(vertexShader);
    // check for shader compile errors
    int success;
    char infoLog[512];
    glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
    if (!success)
    {
        glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
        std::cerr << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl;
    }

    // fragment shader
    int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
    glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
    glCompileShader(fragmentShader);
    // check for shader compile errors
    glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
    if (!success)
    {
        glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
        std::cerr << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n" << infoLog << std::endl;
    }

    // link shaders
    GLuint shaderProgram = glCreateProgram();
    glAttachShader(shaderProgram, vertexShader);
    glAttachShader(shaderProgram, fragmentShader);
    glLinkProgram(shaderProgram);
    // check for linking errors
    glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
    if (!success) {
        glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
        std::cerr << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
    }

    m_shaderPrograms[shaderName] = shaderProgram;

    glDeleteShader(vertexShader);
    glDeleteShader(fragmentShader);

  return success;
}


Shaders::~Shaders()
{
}


GLuint Shaders::getShader(const std::string& shaderName) const
{
  std::map<std::string, GLuint>::const_iterator iter = m_shaderPrograms.find(shaderName);
  if(iter == m_shaderPrograms.end())
  {
    std::cerr << "Error finding shader: " << shaderName << std::endl;
    throw 1;
  }
  else
  {
    return iter->second;
  }

}