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package draw
import "core:math"
import "core:c"
import rl "vendor:raylib"
Vec2 :: [2]f32
Vec3 :: [3]f32
Rect :: struct {
start: Vec2,
size: Vec2,
}
Mat4 :: matrix[4, 4]f32
Color :: [4]f32
SCREEN_WIDTH :: 480
SCREEN_HEIGHT :: 360
renderer: struct {
screen: rl.RenderTexture2D,
tint: Color,
}
@(private)
color_to_rl :: proc(col: Color) -> rl.Color {
return rl.Color{
u8(col.r * 255),
u8(col.g * 255),
u8(col.b * 255),
u8(col.a * 255),
}
}
init :: proc() {
renderer.screen = rl.LoadRenderTexture(SCREEN_WIDTH, SCREEN_HEIGHT)
renderer.tint = Color{1, 1, 1, 1}
}
deinit :: proc() {
rl.UnloadRenderTexture(renderer.screen)
}
new_frame :: proc() {
rl.BeginTextureMode(renderer.screen)
rl.ClearBackground(color_to_rl(Color{0.2, 0.2, 0.2, 1}))
}
end_frame :: proc() {
rl.EndTextureMode()
rl.BeginDrawing()
{
rl.ClearBackground(color_to_rl(Color{0, 0, 0, 1}))
scale := math.min(
f32(rl.GetScreenWidth()) / f32(SCREEN_WIDTH),
f32(rl.GetScreenHeight()) / f32(SCREEN_HEIGHT),
)
screen_start := Vec2{
(f32(rl.GetScreenWidth()) - (SCREEN_WIDTH * scale)) / 2,
(f32(rl.GetScreenHeight()) - (SCREEN_HEIGHT * scale)) / 2,
}
texture_full(
renderer.screen.texture,
screen_start,
scale = Vec2{scale, scale},
)
}
rl.EndDrawing()
}
rect :: proc(
rect: Rect,
) {
assert(rect.size.x > 0 && rect.size.y > 0)
rl.DrawRectangle(
c.int(rect.start.x), c.int(rect.start.y),
c.int(rect.size.x), c.int(rect.size.y),
color_to_rl(renderer.tint),
)
}
texture :: proc{
texture_full,
texture_quad,
}
texture_quad :: proc(
img: rl.Texture2D,
quad: Rect,
position: Vec2,
offset := Vec2{0, 0},
rotation: f32 = 0,
scale := Vec2{1, 1},
) {
// assert(quad.size.x > 0 && quad.size.y > 0)
quad := quad
quad.size *= scale
rl.DrawTexturePro(
img,
transmute(rl.Rectangle)quad,
rl.Rectangle{
position.x, position.y,
quad.size.x * scale.x, quad.size.y * scale.y,
},
offset,
rotation,
color_to_rl(renderer.tint),
)
}
texture_full :: proc(
img: rl.Texture2D,
position: Vec2,
offset := Vec2{0, 0},
rotation: f32 = 0,
scale := Vec2{1, 1},
) {
size := Vec2{
f32(img.width),
-f32(img.height),
}
texture_quad(img, Rect{Vec2{0, 0}, size}, position, offset, rotation, scale)
}
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