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
|
#include "shader.h"
#include "transform.h"
#include <array>
#include <gfx/gl/shaders/fs-basicShader.h>
#include <gfx/gl/shaders/vs-basicShader.h>
#include <glm/glm.hpp>
#include <stdexcept>
#include <string>
Shader::Shader() : mvp_uniform {}, normal_uniform {}, lightDir_uniform {}
{
glAttachShader(m_program, Source {{basicShader_vs, basicShader_vs_len}, GL_VERTEX_SHADER}.id);
glAttachShader(m_program, Source {{basicShader_fs, basicShader_fs_len}, GL_FRAGMENT_SHADER}.id);
glBindAttribLocation(m_program, 0, "position");
glBindAttribLocation(m_program, 1, "texCoord");
glBindAttribLocation(m_program, 2, "normal");
glLinkProgram(m_program);
CheckShaderError(m_program, GL_LINK_STATUS, true, "Error linking shader program");
glValidateProgram(m_program);
CheckShaderError(m_program, GL_VALIDATE_STATUS, true, "Invalid shader program");
mvp_uniform = glGetUniformLocation(m_program, "MVP");
normal_uniform = glGetUniformLocation(m_program, "Normal");
lightDir_uniform = glGetUniformLocation(m_program, "lightDirection");
}
void
Shader::Bind() const
{
glUseProgram(m_program);
}
void
Shader::Update(const Transform & transform, const Camera & camera) const
{
glm::mat4 MVP = transform.GetMVP(camera);
glm::mat4 Normal = transform.GetModel();
glUniformMatrix4fv(mvp_uniform, 1, GL_FALSE, &MVP[0][0]);
glUniformMatrix4fv(normal_uniform, 1, GL_FALSE, &Normal[0][0]);
glUniform3f(lightDir_uniform, 0.0F, 0.0F, 1.0F);
}
void
Shader::CheckShaderError(GLuint shader, GLuint flag, bool isProgram, std::string_view errorMessage)
{
GLint success = 0;
std::array<GLchar, 1024> error {};
if (isProgram) {
glGetProgramiv(shader, flag, &success);
}
else {
glGetShaderiv(shader, flag, &success);
}
if (success == GL_FALSE) {
if (isProgram) {
glGetProgramInfoLog(shader, error.size(), nullptr, error.data());
}
else {
glGetShaderInfoLog(shader, error.size(), nullptr, error.data());
}
throw std::runtime_error {std::string {errorMessage} + ": '" + std::string {error.data(), error.size()} + "'"};
}
}
Shader::Source::Source(const std::basic_string_view<unsigned char> text, GLuint type) :
Source {(const GLchar *)(text.data()), (GLint)(text.length()), type}
{
}
Shader::Source::Source(const GLchar * text, GLint len, unsigned int type) : id {type}
{
glShaderSource(id, 1, &text, &len);
glCompileShader(id);
CheckShaderError(id, GL_COMPILE_STATUS, false, "Error compiling shader!");
}
|
