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Fix black glow cards on streetlamps: discard dark pixels in Mod blend batches

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Mod blend (GL_DST_COLOR, GL_ZERO) multiplies the framebuffer by texture color,
so dark pixels create visible black rectangles. Use a variable colorKeyThreshold
uniform (0.7 for Mod/Mod2x, 0.08 default) to discard dark pixels from these
batches while preserving normal colorKeyBlack behavior elsewhere.
This commit is contained in:
Kelsi 2026-02-19 19:07:58 -08:00
parent d2ff91435a
commit 6aac80e5b1
1 changed files with 13 additions and 1 deletions
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14
src/rendering/m2_renderer.cpp
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@ -326,6 +326,7 @@ bool M2Renderer::initialize(pipeline::AssetManager* assets) {
uniform bool uHasTexture;
uniform bool uAlphaTest;
uniform bool uColorKeyBlack;
uniform float uColorKeyThreshold;
uniform bool uUnlit;
uniform int uBlendMode;
uniform float uFadeAlpha;
@ -358,7 +359,7 @@ bool M2Renderer::initialize(pipeline::AssetManager* assets) {
if (uAlphaTest && maxRgb < 0.06) {
discard;
}
if (uColorKeyBlack && maxRgb < 0.08) {
if (uColorKeyBlack && maxRgb < uColorKeyThreshold) {
discard;
}
// Additive blend modes (3=Add, 6=BlendAdd): near-black fragments
@ -1919,6 +1920,7 @@ void M2Renderer::render(const Camera& camera, const glm::mat4& view, const glm::
glActiveTexture(GL_TEXTURE0);
shader->setUniform("uTexture", 0); // Texture unit 0, set once per frame
shader->setUniform("uColorKeyBlack", false);
shader->setUniform("uColorKeyThreshold", 0.08f);
shader->setUniform("uBlendMode", 0);
// Performance counters
@ -2151,6 +2153,16 @@ void M2Renderer::render(const Camera& camera, const glm::mat4& view, const glm::
shader->setUniform("uColorKeyBlack", colorKeyBlack);
lastColorKeyBlack = colorKeyBlack;
}
// ColorKeyBlack textures: discard dark pixels so background shows through.
// Mod blend (4) multiplies framebuffer by texture — dark pixels darken
// the scene, so use a high threshold to remove the dark rectangle.
if (colorKeyBlack) {
float thresh = 0.08f;
if (batch.blendMode == 4 || batch.blendMode == 5) {
thresh = 0.7f; // Mod/Mod2x: only keep near-white pixels
}
shader->setUniform("uColorKeyThreshold", thresh);
}
// Only bind texture if it changed (texture unit already set to GL_TEXTURE0)
if (hasTexture && batch.texture != lastBoundTexture) {