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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
#include "gl_3d.h"
#include "../util/matrix.h"
#include "gl.h"
#include "gl_batch.h"
GL3D* gl_3d_init( GL_DATA* gl, VEC2 screensize, const char* shadername ) {
GL3D *gl3d = (GL3D*)gl_program_create( gl, shadername, sizeof(GL3D) );
if( !OK( gl_program_compile( gl, gl3d ) ) )
dlog( "gl_2d_init() : error compiling shader %s\n", shadername );
gl3d->winsize = screensize;
gl3d->aspect = screensize.x / screensize.y;
glUseProgram( gl3d->id );
I32 samplers_location = glGetUniformLocation( gl3d->id, "g_samplers" );
glUniform1iv( samplers_location, gl->shader_texture_limit, SAMPLER_INDICES );
return gl3d;
}
void gl_3d_projection_setup( GL_SHADER_PROGRAM *_gl3d, VEC3 pos, F32 fov_deg, F32 yaw, F32 pitch, F32 near, F32 far, VEC2 winsize ) {
GL3D* gl3d = (GL3D*)_gl3d;
MAT4 proj, yaw_rot, pitch_rot, view, transl, tmp;
F32 fov_y_rad = m_deg2rad( fov_deg );
F32 yaw_rad = m_deg2rad( remainderf( yaw + 90.f, 360.f ) );
F32 pitch_rad = m_deg2rad( remainderf( pitch , 360.f ) );
gl3d->aspect = winsize.y > 0.f ? winsize.x / winsize.y : 1.f;
if( gl3d->aspect <= 0.000001f )
gl3d->aspect = 1.f;
const F32 min_fovy = m_deg2rad( 1.f );
const F32 max_fovy = m_deg2rad( 179.f );
if( fov_y_rad < min_fovy ) fov_y_rad = min_fovy;
if( fov_y_rad > max_fovy ) fov_y_rad = max_fovy;
gl3d->winsize = winsize;
mat4_perspective( &proj, fov_y_rad, gl3d->aspect, near, far );
mat4_rotation_y( &yaw_rot, -yaw_rad );
mat4_rotation_x( &pitch_rot, -pitch_rad );
mat4_translation( &transl, -pos.x, -pos.z, -pos.y );
mat4_mul( &yaw_rot, &transl, &tmp );
mat4_mul( &pitch_rot, &tmp, &view );
mat4_mul( &proj, &view, &gl3d->projmat );
gl3d->gl->proj_matrix = &gl3d->projmat;
glUseProgram( gl3d->id );
I32 location = glGetUniformLocation( gl3d->id, "in_proj_matrix" );
glUniformMatrix4fv( location, 1, 1, (GLfloat*)&gl3d->projmat );
glUniform1f( glGetUniformLocation( gl3d->id, "in_time" ), u_time() );
}
void gl_3d_batch_setup( GL_BATCH3D *batch ) {
glUseProgram( batch->shader->id );
glBindBuffer( GL_ARRAY_BUFFER, batch->vbuffer );
I32 position = glGetAttribLocation( batch->shader->id, "in_pos" );
glEnableVertexAttribArray( position );
glVertexAttribPointer( position, 3, GL_FLOAT, 0, sizeof(VERTEX3D), 0 );
I32 color = glGetAttribLocation( batch->shader->id, "in_clr" );
glEnableVertexAttribArray( color );
glVertexAttribPointer( color, 3, GL_FLOAT, 0, sizeof(VERTEX3D), &( (VERTEX3D*)nullptr )->clr );
I32 texcoord = glGetAttribLocation( batch->shader->id, "in_texcoord" );
glEnableVertexAttribArray( texcoord );
glVertexAttribPointer( texcoord, 2, GL_FLOAT, 0, sizeof(VERTEX3D), &( (VERTEX3D*)nullptr )->uv );
I32 sampler = glGetAttribLocation( batch->shader->id, "in_sampler" );
glEnableVertexAttribArray( sampler );
glVertexAttribPointer( sampler, 1, GL_UNSIGNED_BYTE, 1, sizeof(VERTEX3D), &( (VERTEX3D*)nullptr )->sampler );
glBindBuffer( GL_ARRAY_BUFFER, 0 );
}
void gl_3d_polygon(
GL_SHADER_PROGRAM* gl3d,
VERTEX3D* vertices,
U32 vertices_count,
GL_TEX2D* tex
) {
glUseProgram( gl3d->id );
if( !!tex ) {
glActiveTexture( GL_TEXTURE0 );
glBindTexture( GL_TEXTURE_2D, tex->id );
} else {
for( U32 i = 0; i < vertices_count; ++i )
vertices[i].sampler = SAMPLER_ID_NONE;
}
glBindBuffer( GL_ARRAY_BUFFER, gl3d->gl->vbuffer );
glBufferData( GL_ARRAY_BUFFER, sizeof(VERTEX3D) * vertices_count, vertices, GL_STATIC_DRAW );
I32 position = glGetAttribLocation( gl3d->id, "in_pos" );
glEnableVertexAttribArray( position );
glVertexAttribPointer( position, 3, GL_FLOAT, 0, sizeof(VERTEX3D), 0 );
I32 color = glGetAttribLocation( gl3d->id, "in_clr" );
glEnableVertexAttribArray( color );
glVertexAttribPointer( color, 3, GL_FLOAT, 0, sizeof(VERTEX3D), &( (VERTEX3D*)nullptr )->clr );
I32 texcoord = glGetAttribLocation( gl3d->id, "in_texcoord" );
glEnableVertexAttribArray( texcoord );
glVertexAttribPointer( texcoord, 2, GL_FLOAT, 0, sizeof(VERTEX3D), &( (VERTEX3D*)nullptr )->uv );
I32 sampler = glGetAttribLocation( gl3d->id, "in_sampler" );
glEnableVertexAttribArray( sampler );
glVertexAttribPointer( sampler, 1, GL_UNSIGNED_BYTE, 1, sizeof(VERTEX3D), &( (VERTEX3D*)nullptr )->sampler );
U16* order = (U16*)alloca( sizeof(U16) * vertices_count );
for( U32 i = 0; i < vertices_count; i++ )
order[i] = i;
glBindBuffer( GL_ARRAY_BUFFER, 0 );
glDrawElements( GL_TRIANGLE_FAN, vertices_count, GL_UNSIGNED_SHORT, order );
}
void gl_3d_polygon_fan(
GL_BATCH3D* batch,
VERTEX3D* vertices,
U32 vertices_count,
GL_TEX2D* tex
) {
if( vertices_count < 3 )
return;
LIST<VERTEX3D> list = triangle_fan_to_list( vertices, vertices_count );
gl_batch_insert(
batch,
list.data,
list.size,
tex
);
}
void gl_3d_polygon(
GL_BATCH3D* batch,
VERTEX3D* vertices,
U32 vertices_count,
GL_TEX2D* tex
) {
gl_batch_insert(
batch,
vertices,
vertices_count,
tex
);
}
void build_plane( VERTEX3D* v, VEC3 pos, VEC2 size, VEC2 rot, CLR col ) {
F32 half_width = size.x * 0.5f;
F32 half_height = size.y * 0.5f;
VEC3 vertices[4] = {
{ -half_width, -half_height, 0 },
{ half_width, -half_height, 0 },
{ half_width, half_height, 0 },
{ -half_width, half_height, 0 }
};
F32 sin_pitch = sinf( m_deg2rad( rot.x ) );
F32 cos_pitch = cosf( m_deg2rad( rot.x ) );
F32 sin_yaw = sinf( m_deg2rad( rot.y ) );
F32 cos_yaw = cosf( m_deg2rad( rot.y ) );
for( I32 i = 0; i < 4; i++) {
F32 x = vertices[i].x;
F32 y = vertices[i].y;
F32 z = vertices[i].z;
vertices[i].y = y * cos_pitch - z * sin_pitch;
vertices[i].z = y * sin_pitch + z * cos_pitch;
y = vertices[i].y;
vertices[i].x = x * cos_yaw - y * sin_yaw;
vertices[i].y = x * sin_yaw + y * cos_yaw;
vertices[i].x += pos.x;
vertices[i].y += pos.y;
vertices[i].z += pos.z;
}
VEC2 uvs[4] = {
{ 0.0f, 1.0f },
{ 1.0f, 1.0f },
{ 1.0f, 0.0f },
{ 0.0f, 0.0f }
};
v[0] = { .pos = { vertices[0].x, vertices[0].z, vertices[0].y }, .uv = uvs[0], .clr = col };
v[1] = { .pos = { vertices[1].x, vertices[1].z, vertices[1].y }, .uv = uvs[1], .clr = col };
v[2] = { .pos = { vertices[2].x, vertices[2].z, vertices[2].y }, .uv = uvs[2], .clr = col };
v[3] = { .pos = { vertices[3].x, vertices[3].z, vertices[3].y }, .uv = uvs[3], .clr = col };
}
void gl_3d_plane(
GL_SHADER_PROGRAM* gl3d,
VEC3 pos,
VEC2 size,
VEC2 rot,
GL_TEX2D* tex,
CLR col
) {
VERTEX3D v[4];
build_plane( v, pos, size, rot, col );
gl_3d_polygon( gl3d, v, 4, tex );
}
void gl_3d_plane(
GL_BATCH3D* batch,
VEC3 pos,
VEC2 size,
VEC2 rot,
GL_TEX2D* tex,
CLR col
) {
VERTEX3D v[4];
build_plane( v, pos, size, rot, col );
gl_3d_polygon_fan( batch, v, 4, tex );
}
|
