DragonEngine/ModuleProgram.cpp at master · Dartemiss/DragonEngine · 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
#include"Globals.h"
#include"Application.h"
#include"ModuleProgram.h"
#include"SDL/SDL.h"
#include"GL/glew.h"
#include"MathGeoLib/Math/float4x4.h"
#include"assert.h"
#include<string>
#include<streambuf>
#include<fstream>


boolModuleProgram::Init()
{
//Lighting shader
	uberProg = createProgramWithShaders("../Shaders/UberShader.vs", "../Shaders/UberShader.fs");

//Skybox shader
	skyboxProg = createProgramWithShaders("../Shaders/Skybox.vs", "../Shaders/Skybox.fs");

//Default shader
	defaultProg = createProgramWithShaders("../Shaders/VertexShader.vs", "../Shaders/FragmentShader.fs");

returntrue;
}

boolModuleProgram::CleanUp()
{
glDeleteProgram(uberProg);
glDeleteProgram(skyboxProg);
glDeleteProgram(defaultProg);

returntrue;
}

unsignedintModuleProgram::createProgramWithShaders(constchar * vertexFilename, constchar * fragmentFilename) const
{
LOG("Compiling Vertex Shader from %s", vertexFilename);
unsignedint vertexShader = createShader(vertexFilename, GL_VERTEX_SHADER);
LOG("Compiling Fragment Shader from %s", fragmentFilename);
unsignedint fragmentShader = createShader(fragmentFilename, GL_FRAGMENT_SHADER);

returncreateProgram(vertexShader, fragmentShader);
}

unsignedintModuleProgram::createProgram(unsignedint vShader, unsignedintfShader) const
{
unsignedint program = glCreateProgram();

if (vShader != NULL)
	{
LOG("Attaching Vertex Shader");
glAttachShader(program, vShader);
	}

if (fShader != NULL)
	{
LOG("Attaching Fragment Shader");
glAttachShader(program, fShader);
	}

LOG("Linking program");
glLinkProgram(program);

int success;
char infoLog[512];
glGetProgramiv(program, GL_LINK_STATUS, &success);
if (!success) {
glGetProgramInfoLog(program, 512, NULL, infoLog);
LOG("\nERROR::PROGRAM::CREATION_FAILED");
LOG("ERROR: %s\n", infoLog);
	}

//Now we can delete shaders
LOG("Deleting Vertex Shader");
glDeleteShader(vShader);

LOG("Deleting Fragment Shader\n");
glDeleteShader(fShader);

return program;
}

unsignedintModuleProgram::createShader(constchar * filename, unsignedint shaderType) const
{
assert(filename != nullptr);

char* data = readFile(filename);
unsignedint shaderId = glCreateShader(shaderType);
glShaderSource(shaderId, 1, &data, NULL);
glCompileShader(shaderId);
delete[] data;

	GLint success = GL_FALSE;
int logLength;
glGetShaderiv(shaderId, GL_COMPILE_STATUS, &success);

if (!success) {
glGetShaderiv(shaderId, GL_INFO_LOG_LENGTH, &logLength);
 std::vector<GLchar> shaderError((logLength > 1) ? logLength : 1);
glGetShaderInfoLog(shaderId, logLength, NULL, &shaderError[0]);
LOG("ERROR: Shader with path %s coudn't be compiled : %s\n", filename, &shaderError[0]);
	}

return shaderId;
}

char* ModuleProgram::readFile(constchar* file_name) const
{
assert(file_name != nullptr);

char* result = nullptr;
FILE* file = nullptr;
fopen_s(&file, file_name, "rb");
if (file)
	{
fseek(file, 0, SEEK_END);
int size = ftell(file);
rewind(file);
 result = newchar[size + 1];
fread(result, 1, size, file);
 result[size] = 0;
fclose(file);
	}

return result;
}