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
|
#pragma once
#include "common.hpp"
#include "program.hpp"
#include "shaders/basic.hpp"
namespace kel {
namespace lbm {
namespace sch {
using namespace saw::schema;
}
struct ogl_state final {
public:
SDL_Window* window;
SDL_GLContext context;
int version;
GLuint vao_id;
GLuint vbo_id;
GLuint veo_id;
GLuint program_id;
GLuint fbo_id;
GLuint tex_id;
uint64_t w, h;
public:
ogl_state():
window{nullptr},
version{0},
vao_id{0u},
vbo_id{0u},
program_id{0u},
fbo_id{0u},
tex_id{0u},
w{1024},
h{1024}
{
SDL_Init(SDL_INIT_VIDEO);
}
~ogl_state(){
SDL_GL_DestroyContext(context);
if(window){
SDL_DestroyWindow(window);
window = nullptr;
}
SDL_Quit();
}
void clear(){
glClear(GL_COLOR_BUFFER_BIT);
}
};
saw::error_or<saw::own<ogl_state>> create_ogl_renderer(){
auto owned_state = saw::heap<ogl_state>();
auto& st = *owned_state;
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION,3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION,3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
st.window = SDL_CreateWindow("Kel'LBM Renderer",st.w,st.h,SDL_WINDOW_OPENGL /*| SDL_WINDOW_HIDDEN*/);
if(not st.window){
return saw::make_error<saw::err::critical>("Window not created");
}
st.context = SDL_GL_CreateContext(st.window);
st.version = gladLoadGL((GLADloadfunc)SDL_GL_GetProcAddress);
glGenVertexArrays(1,&st.vao_id);
glBindVertexArray(st.vao_id);
glClearColor(0.0,0.0,0.0,1.0);
glGenBuffers(1,&st.vbo_id);
glGenBuffers(1,&st.veo_id);
static constexpr GLfloat vertex_buffer_data[] = {
-1.f, -1.f, 0.f, 0.f,
1.f, -1.f, 1.f, 0.f,
1.f, 1.f, 1.f, 1.f,
-1.f, 1.f, 0.f, 1.f
};
static unsigned int index_buffer_data[] = {
0, 1, 2,
2, 3, 0
};
glBindBuffer(GL_ARRAY_BUFFER, st.vbo_id);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_buffer_data), vertex_buffer_data, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, st.veo_id);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(index_buffer_data), index_buffer_data, GL_STATIC_DRAW);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), 0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), (void*)(2 * sizeof(GLfloat)));
glEnableVertexAttribArray(1);
glGenFramebuffers(1,&st.fbo_id);
//glBindFramebuffer(GL_FRAMEBUFFER, st.fbo_id);
glGenTextures(1,&st.tex_id);
glBindTexture(GL_TEXTURE_2D,st.tex_id);
glTexImage2D(
GL_TEXTURE_2D,
0,
GL_RGBA,
1024,
1024,
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
NULL
);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glFramebufferTexture2D(
GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D,
st.tex_id,
0
);
glViewport(0,0,1024,1024);
st.program_id = create_ogl_program(shader_basic_vertex.data(), shader_basic_fragment.data());
glUseProgram(st.program_id);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, st.tex_id);
glUniform1i(glGetUniformLocation(st.program_id, "tex_sampler"), 0);
st.clear();
return owned_state;
}
}
}
|
