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Texture Rendering (#9)

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Co-authored-by: Zachary Levy <zachary@sunforge.is>
Reviewed-on: #9
This commit was merged in pull request #9.
This commit is contained in:
Zachary Levy
2026-04-22 00:05:08 +00:00
parent 64de816647
commit 0d424cbd6e
19 changed files with 1765 additions and 357 deletions
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5
draw/examples/hellope.odin
View File

@@ -78,10 +78,11 @@ hellope_shapes :: proc() {
draw.ellipse(base_layer, {410, 340}, 50, 30, {255, 200, 50, 255}, rotation = spin_angle)
// Circle orbiting a point (moon orbiting planet)
// Convention B: center = pivot point (planet), origin = offset from moon center to pivot.
// Moon's visual center at rotation=0: planet_pos - origin = (100, 450) - (0, 40) = (100, 410).
planet_pos := [2]f32{100, 450}
moon_pos := planet_pos + {0, -40}
draw.circle(base_layer, planet_pos, 8, {200, 200, 200, 255}) // planet (stationary)
draw.circle(base_layer, moon_pos, 5, {100, 150, 255, 255}, origin = {0, 40}, rotation = spin_angle) // moon orbiting
draw.circle(base_layer, planet_pos, 5, {100, 150, 255, 255}, origin = {0, 40}, rotation = spin_angle) // moon orbiting
// Ring arc rotating in place
draw.ring(base_layer, {250, 450}, 15, 30, 0, 270, {100, 100, 220, 255}, rotation = spin_angle)

5
draw/examples/main.odin
View File

@@ -57,7 +57,7 @@ main :: proc() {
args := os.args
if len(args) < 2 {
fmt.eprintln("Usage: examples <example_name>")
fmt.eprintln("Available examples: hellope-shapes, hellope-text, hellope-clay, hellope-custom")
fmt.eprintln("Available examples: hellope-shapes, hellope-text, hellope-clay, hellope-custom, textures")
os.exit(1)
}
@@ -66,9 +66,10 @@ main :: proc() {
case "hellope-custom": hellope_custom()
case "hellope-shapes": hellope_shapes()
case "hellope-text": hellope_text()
case "textures": textures()
case:
fmt.eprintf("Unknown example: %v\n", args[1])
fmt.eprintln("Available examples: hellope-shapes, hellope-text, hellope-clay, hellope-custom")
fmt.eprintln("Available examples: hellope-shapes, hellope-text, hellope-clay, hellope-custom, textures")
os.exit(1)
}
}

272
draw/examples/textures.odin Normal file
View File

@@ -0,0 +1,272 @@
package examples
import "../../draw"
import "../../draw/draw_qr"
import "core:os"
import sdl "vendor:sdl3"
textures :: proc() {
if !sdl.Init({.VIDEO}) do os.exit(1)
window := sdl.CreateWindow("Textures", 800, 600, {.HIGH_PIXEL_DENSITY})
gpu := sdl.CreateGPUDevice(draw.PLATFORM_SHADER_FORMAT, true, nil)
if !sdl.ClaimWindowForGPUDevice(gpu, window) do os.exit(1)
if !draw.init(gpu, window) do os.exit(1)
JETBRAINS_MONO_REGULAR = draw.register_font(JETBRAINS_MONO_REGULAR_RAW)
FONT_SIZE :: u16(14)
LABEL_OFFSET :: f32(8) // gap between item and its label
//----- Texture registration ----------------------------------
checker_size :: 8
checker_pixels: [checker_size * checker_size * 4]u8
for y in 0 ..< checker_size {
for x in 0 ..< checker_size {
i := (y * checker_size + x) * 4
is_dark := ((x + y) % 2) == 0
val: u8 = 40 if is_dark else 220
checker_pixels[i + 0] = val // R
checker_pixels[i + 1] = val / 2 // G — slight color tint
checker_pixels[i + 2] = val // B
checker_pixels[i + 3] = 255 // A
}
}
checker_texture, _ := draw.register_texture(
draw.Texture_Desc {
width = checker_size,
height = checker_size,
depth_or_layers = 1,
type = .D2,
format = .R8G8B8A8_UNORM,
usage = {.SAMPLER},
mip_levels = 1,
},
checker_pixels[:],
)
defer draw.unregister_texture(checker_texture)
stripe_w :: 16
stripe_h :: 8
stripe_pixels: [stripe_w * stripe_h * 4]u8
for y in 0 ..< stripe_h {
for x in 0 ..< stripe_w {
i := (y * stripe_w + x) * 4
stripe_pixels[i + 0] = u8(x * 255 / (stripe_w - 1)) // R gradient left→right
stripe_pixels[i + 1] = u8(y * 255 / (stripe_h - 1)) // G gradient top→bottom
stripe_pixels[i + 2] = 128 // B constant
stripe_pixels[i + 3] = 255 // A
}
}
stripe_texture, _ := draw.register_texture(
draw.Texture_Desc {
width = stripe_w,
height = stripe_h,
depth_or_layers = 1,
type = .D2,
format = .R8G8B8A8_UNORM,
usage = {.SAMPLER},
mip_levels = 1,
},
stripe_pixels[:],
)
defer draw.unregister_texture(stripe_texture)
qr_texture, _ := draw_qr.register_texture_from("https://x.com/miiilato/status/1880241066471051443")
defer draw.unregister_texture(qr_texture)
spin_angle: f32 = 0
//----- Draw loop ----------------------------------
for {
defer free_all(context.temp_allocator)
ev: sdl.Event
for sdl.PollEvent(&ev) {
if ev.type == .QUIT do return
}
spin_angle += 1
base_layer := draw.begin({width = 800, height = 600})
// Background
draw.rectangle(base_layer, {0, 0, 800, 600}, {30, 30, 30, 255})
//----- Row 1: Sampler presets (y=30) ----------------------------------
ROW1_Y :: f32(30)
ITEM_SIZE :: f32(120)
COL1 :: f32(30)
COL2 :: f32(180)
COL3 :: f32(330)
COL4 :: f32(480)
// Nearest (sharp pixel edges)
draw.rectangle_texture(
base_layer,
{COL1, ROW1_Y, ITEM_SIZE, ITEM_SIZE},
checker_texture,
sampler = .Nearest_Clamp,
)
draw.text(
base_layer,
"Nearest",
{COL1, ROW1_Y + ITEM_SIZE + LABEL_OFFSET},
JETBRAINS_MONO_REGULAR,
FONT_SIZE,
color = draw.WHITE,
)
// Linear (bilinear blur)
draw.rectangle_texture(
base_layer,
{COL2, ROW1_Y, ITEM_SIZE, ITEM_SIZE},
checker_texture,
sampler = .Linear_Clamp,
)
draw.text(
base_layer,
"Linear",
{COL2, ROW1_Y + ITEM_SIZE + LABEL_OFFSET},
JETBRAINS_MONO_REGULAR,
FONT_SIZE,
color = draw.WHITE,
)
// Tiled (4x repeat)
draw.rectangle_texture(
base_layer,
{COL3, ROW1_Y, ITEM_SIZE, ITEM_SIZE},
checker_texture,
sampler = .Nearest_Repeat,
uv_rect = {0, 0, 4, 4},
)
draw.text(
base_layer,
"Tiled 4x",
{COL3, ROW1_Y + ITEM_SIZE + LABEL_OFFSET},
JETBRAINS_MONO_REGULAR,
FONT_SIZE,
color = draw.WHITE,
)
//----- Row 2: Sampler presets (y=190) ----------------------------------
ROW2_Y :: f32(190)
// QR code (RGBA texture with baked colors, nearest sampling)
draw.rectangle(base_layer, {COL1, ROW2_Y, ITEM_SIZE, ITEM_SIZE}, {255, 255, 255, 255}) // white bg
draw.rectangle_texture(
base_layer,
{COL1, ROW2_Y, ITEM_SIZE, ITEM_SIZE},
qr_texture,
sampler = .Nearest_Clamp,
)
draw.text(
base_layer,
"QR Code",
{COL1, ROW2_Y + ITEM_SIZE + LABEL_OFFSET},
JETBRAINS_MONO_REGULAR,
FONT_SIZE,
color = draw.WHITE,
)
// Rounded corners
draw.rectangle_texture(
base_layer,
{COL2, ROW2_Y, ITEM_SIZE, ITEM_SIZE},
checker_texture,
sampler = .Nearest_Clamp,
roundness = 0.3,
)
draw.text(
base_layer,
"Rounded",
{COL2, ROW2_Y + ITEM_SIZE + LABEL_OFFSET},
JETBRAINS_MONO_REGULAR,
FONT_SIZE,
color = draw.WHITE,
)
// Rotating
rot_rect := draw.Rectangle{COL3, ROW2_Y, ITEM_SIZE, ITEM_SIZE}
draw.rectangle_texture(
base_layer,
rot_rect,
checker_texture,
sampler = .Nearest_Clamp,
origin = draw.center_of(rot_rect),
rotation = spin_angle,
)
draw.text(
base_layer,
"Rotating",
{COL3, ROW2_Y + ITEM_SIZE + LABEL_OFFSET},
JETBRAINS_MONO_REGULAR,
FONT_SIZE,
color = draw.WHITE,
)
//----- Row 3: Fit modes + Per-corner radii (y=360) ----------------------------------
ROW3_Y :: f32(360)
FIT_SIZE :: f32(120) // square target rect
// Stretch
uv_s, sampler_s, inner_s := draw.fit_params(.Stretch, {COL1, ROW3_Y, FIT_SIZE, FIT_SIZE}, stripe_texture)
draw.rectangle(base_layer, {COL1, ROW3_Y, FIT_SIZE, FIT_SIZE}, {60, 60, 60, 255}) // bg
draw.rectangle_texture(base_layer, inner_s, stripe_texture, uv_rect = uv_s, sampler = sampler_s)
draw.text(
base_layer,
"Stretch",
{COL1, ROW3_Y + FIT_SIZE + LABEL_OFFSET},
JETBRAINS_MONO_REGULAR,
FONT_SIZE,
color = draw.WHITE,
)
// Fill (center-crop)
uv_f, sampler_f, inner_f := draw.fit_params(.Fill, {COL2, ROW3_Y, FIT_SIZE, FIT_SIZE}, stripe_texture)
draw.rectangle(base_layer, {COL2, ROW3_Y, FIT_SIZE, FIT_SIZE}, {60, 60, 60, 255})
draw.rectangle_texture(base_layer, inner_f, stripe_texture, uv_rect = uv_f, sampler = sampler_f)
draw.text(
base_layer,
"Fill",
{COL2, ROW3_Y + FIT_SIZE + LABEL_OFFSET},
JETBRAINS_MONO_REGULAR,
FONT_SIZE,
color = draw.WHITE,
)
// Fit (letterbox)
uv_ft, sampler_ft, inner_ft := draw.fit_params(.Fit, {COL3, ROW3_Y, FIT_SIZE, FIT_SIZE}, stripe_texture)
draw.rectangle(base_layer, {COL3, ROW3_Y, FIT_SIZE, FIT_SIZE}, {60, 60, 60, 255}) // visible margin bg
draw.rectangle_texture(base_layer, inner_ft, stripe_texture, uv_rect = uv_ft, sampler = sampler_ft)
draw.text(
base_layer,
"Fit",
{COL3, ROW3_Y + FIT_SIZE + LABEL_OFFSET},
JETBRAINS_MONO_REGULAR,
FONT_SIZE,
color = draw.WHITE,
)
// Per-corner radii
draw.rectangle_texture_corners(
base_layer,
{COL4, ROW3_Y, FIT_SIZE, FIT_SIZE},
{20, 0, 20, 0},
checker_texture,
sampler = .Nearest_Clamp,
)
draw.text(
base_layer,
"Per-corner",
{COL4, ROW3_Y + FIT_SIZE + LABEL_OFFSET},
JETBRAINS_MONO_REGULAR,
FONT_SIZE,
color = draw.WHITE,
)
draw.end(gpu, window)
}
}