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
212
213
214
215
216
217
218
219
220
221
|
const Texture = @This();
const std = @import("std");
const c = @import("c.zig").c;
const errors = @import("errors.zig");
const glad = @import("glad.zig");
id: c.GLuint,
pub fn active(index: c_uint) errors.Error!void {
glad.context.ActiveTexture.?(index + c.GL_TEXTURE0);
try errors.getError();
}
/// Create a single texture.
pub fn create() errors.Error!Texture {
var id: c.GLuint = undefined;
glad.context.GenTextures.?(1, &id);
try errors.getError();
return .{ .id = id };
}
/// glBindTexture
pub fn bind(v: Texture, target: Target) !Binding {
glad.context.BindTexture.?(@intFromEnum(target), v.id);
try errors.getError();
return .{ .target = target };
}
pub fn destroy(v: Texture) void {
glad.context.DeleteTextures.?(1, &v.id);
}
/// Enum for possible texture binding targets.
pub const Target = enum(c_uint) {
@"1D" = c.GL_TEXTURE_1D,
@"2D" = c.GL_TEXTURE_2D,
@"3D" = c.GL_TEXTURE_3D,
@"1DArray" = c.GL_TEXTURE_1D_ARRAY,
@"2DArray" = c.GL_TEXTURE_2D_ARRAY,
Rectangle = c.GL_TEXTURE_RECTANGLE,
CubeMap = c.GL_TEXTURE_CUBE_MAP,
Buffer = c.GL_TEXTURE_BUFFER,
@"2DMultisample" = c.GL_TEXTURE_2D_MULTISAMPLE,
@"2DMultisampleArray" = c.GL_TEXTURE_2D_MULTISAMPLE_ARRAY,
};
/// Enum for possible texture parameters.
pub const Parameter = enum(c_uint) {
BaseLevel = c.GL_TEXTURE_BASE_LEVEL,
CompareFunc = c.GL_TEXTURE_COMPARE_FUNC,
CompareMode = c.GL_TEXTURE_COMPARE_MODE,
LodBias = c.GL_TEXTURE_LOD_BIAS,
MinFilter = c.GL_TEXTURE_MIN_FILTER,
MagFilter = c.GL_TEXTURE_MAG_FILTER,
MinLod = c.GL_TEXTURE_MIN_LOD,
MaxLod = c.GL_TEXTURE_MAX_LOD,
MaxLevel = c.GL_TEXTURE_MAX_LEVEL,
SwizzleR = c.GL_TEXTURE_SWIZZLE_R,
SwizzleG = c.GL_TEXTURE_SWIZZLE_G,
SwizzleB = c.GL_TEXTURE_SWIZZLE_B,
SwizzleA = c.GL_TEXTURE_SWIZZLE_A,
WrapS = c.GL_TEXTURE_WRAP_S,
WrapT = c.GL_TEXTURE_WRAP_T,
WrapR = c.GL_TEXTURE_WRAP_R,
};
/// Internal format enum for texture images.
pub const InternalFormat = enum(c_int) {
red = c.GL_RED,
rgb = c.GL_RGB8,
rgba = c.GL_RGBA8,
srgb = c.GL_SRGB8,
srgba = c.GL_SRGB8_ALPHA8,
rgba_compressed = c.GL_COMPRESSED_RGBA_BPTC_UNORM,
srgba_compressed = c.GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM,
// There are so many more that I haven't filled in.
_,
};
/// Format for texture images
pub const Format = enum(c_uint) {
red = c.GL_RED,
rgb = c.GL_RGB,
rgba = c.GL_RGBA,
bgra = c.GL_BGRA,
// There are so many more that I haven't filled in.
_,
};
/// Minification filter for textures.
pub const MinFilter = enum(c_int) {
nearest = c.GL_NEAREST,
linear = c.GL_LINEAR,
nearest_mipmap_nearest = c.GL_NEAREST_MIPMAP_NEAREST,
linear_mipmap_nearest = c.GL_LINEAR_MIPMAP_NEAREST,
nearest_mipmap_linear = c.GL_NEAREST_MIPMAP_LINEAR,
linear_mipmap_linear = c.GL_LINEAR_MIPMAP_LINEAR,
};
/// Magnification filter for textures.
pub const MagFilter = enum(c_int) {
nearest = c.GL_NEAREST,
linear = c.GL_LINEAR,
};
/// Texture coordinate wrapping mode.
pub const Wrap = enum(c_int) {
clamp_to_edge = c.GL_CLAMP_TO_EDGE,
clamp_to_border = c.GL_CLAMP_TO_BORDER,
mirrored_repeat = c.GL_MIRRORED_REPEAT,
repeat = c.GL_REPEAT,
};
/// Data type for texture images.
pub const DataType = enum(c_uint) {
UnsignedByte = c.GL_UNSIGNED_BYTE,
// There are so many more that I haven't filled in.
_,
};
pub const Binding = struct {
target: Target,
pub fn unbind(b: *const Binding) void {
glad.context.BindTexture.?(@intFromEnum(b.target), 0);
}
pub fn generateMipmap(b: Binding) void {
glad.context.GenerateMipmap.?(@intFromEnum(b.target));
}
pub fn parameter(b: Binding, name: Parameter, value: anytype) errors.Error!void {
switch (@TypeOf(value)) {
c.GLint => glad.context.TexParameteri.?(
@intFromEnum(b.target),
@intFromEnum(name),
value,
),
else => unreachable,
}
try errors.getError();
}
pub fn image2D(
b: Binding,
level: c.GLint,
internal_format: InternalFormat,
width: c.GLsizei,
height: c.GLsizei,
format: Format,
typ: DataType,
data: ?*const anyopaque,
) errors.Error!void {
glad.context.TexImage2D.?(
@intFromEnum(b.target),
level,
@intFromEnum(internal_format),
width,
height,
0,
@intFromEnum(format),
@intFromEnum(typ),
data,
);
try errors.getError();
}
pub fn subImage2D(
b: Binding,
level: c.GLint,
xoffset: c.GLint,
yoffset: c.GLint,
width: c.GLsizei,
height: c.GLsizei,
format: Format,
typ: DataType,
data: ?*const anyopaque,
) errors.Error!void {
glad.context.TexSubImage2D.?(
@intFromEnum(b.target),
level,
xoffset,
yoffset,
width,
height,
@intFromEnum(format),
@intFromEnum(typ),
data,
);
try errors.getError();
}
pub fn copySubImage2D(
b: Binding,
level: c.GLint,
xoffset: c.GLint,
yoffset: c.GLint,
x: c.GLint,
y: c.GLint,
width: c.GLsizei,
height: c.GLsizei,
) errors.Error!void {
glad.context.CopyTexSubImage2D.?(
@intFromEnum(b.target),
level,
xoffset,
yoffset,
x,
y,
width,
height,
);
try errors.getError();
}
};
|
