mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
38 lines
1.1 KiB
V
38 lines
1.1 KiB
V
module gg
|
|
|
|
import gl
|
|
import gx
|
|
import math
|
|
|
|
fn arc_vertices(x, y, r, start_angle, end_angle f32, segments int) []f32 {
|
|
mut vertices := []f32{}
|
|
start_rads := start_angle * 0.0174533 // deg -> rad approx
|
|
end_rads := end_angle * 0.0174533
|
|
increment := (end_rads - start_rads) / f32(segments)
|
|
vertices << [x + f32(math.cos(start_rads)) * r, y + f32(math.sin(start_rads)) * r] !
|
|
mut i := 1
|
|
for i < segments {
|
|
theta := f32(i) * increment + start_rads
|
|
vertices << [x + f32(math.cos(theta)) * r, y + f32(math.sin(theta)) * r] !
|
|
i++
|
|
}
|
|
vertices << [x + f32(math.cos(end_rads)) * r, y + f32(math.sin(end_rads)) * r] !
|
|
return vertices
|
|
}
|
|
|
|
fn (ctx &GG) use_color_shader(color gx.Color) {
|
|
ctx.shader.set_int('has_texture', 0)
|
|
C.glDeleteBuffers(1, &ctx.vao)
|
|
C.glDeleteBuffers(1, &ctx.vbo)
|
|
ctx.shader.use()
|
|
ctx.shader.set_color('color', color)
|
|
}
|
|
|
|
fn (ctx &GG) bind_vertices(vertices []f32) {
|
|
gl.bind_vao(ctx.vao)
|
|
gl.set_vbo(ctx.vbo, vertices, C.GL_STATIC_DRAW)
|
|
gl.vertex_attrib_pointer(0, 2, C.GL_FLOAT, false, 2, 0)
|
|
gl.enable_vertex_attrib_array(0)
|
|
gl.bind_vao(ctx.vao)
|
|
}
|