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feat(D.2b): textured-sprite path in TextRenderer + UV-rect DrawSprite

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Add uUseTexture==2 (RGBA modulate) branch to ui_text.frag so dat sprites
can be drawn through the existing 2D batcher without touching the font path.

TextRenderer gains _spriteBufs (per-GL-handle List<float>), DrawSprite(), and
a Flush block that issues one draw call per distinct texture with uUseTexture=2.
Also adds DepthMask(false) in the state-save block (restored to true after) to
prevent the transparent-quad pass from writing depth and corrupting the 3D scene
if the UI is flushed mid-frame.

TextureCache gains GetOrUpload(surfaceId, out width, out height) — caches pixel
dimensions alongside the GL handle so UI 9-slice geometry can compute slice UVs
from the source image size without a second decode.

UiRenderContext gains a DrawSprite forwarder that applies the current 2D
translate stack, matching the DrawRect / DrawRectOutline pattern.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-06-14 14:28:29 +02:00
parent 626d06ebc1
commit c9eef1d7cd
4 changed files with 70 additions and 2 deletions
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5
src/AcDream.App/Rendering/Shaders/ui_text.frag
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@ -7,10 +7,13 @@ uniform sampler2D uTex;
uniform int uUseTexture;
void main() {
if (uUseTexture != 0) {
if (uUseTexture == 1) {
// Font atlas is a single-channel R8 texture; red = coverage alpha.
float coverage = texture(uTex, vUv).r;
FragColor = vec4(vColor.rgb, vColor.a * coverage);
} else if (uUseTexture == 2) {
// RGBA dat sprite (decoded to RGBA8); modulate by tint/alpha.
FragColor = texture(uTex, vUv) * vColor;
} else {
FragColor = vColor;
}