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Use the fragment shader to calculate the shading effect for a more uniform shading than the one based on vertex

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luisangelsm
2026-01-18 18:23:04 +01:00
parent 7384d50721
commit 41b02725d7
7 changed files with 58 additions and 32 deletions
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31
common/rhi/shaders/flow.frag
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@ -2,8 +2,11 @@
// Inputs from vertex shader
layout(location = 0) in vec2 vTexCoord;
layout(location = 1) in vec4 vColor;
layout(location = 2) in float vIsReflection;
layout(location = 1) in flat vec4 vInstanceShading;
layout(location = 2) in flat float vInstanceOpacity;
layout(location = 3) in flat float vIsReflection;
layout(location = 4) in flat float vInstanceRotation;
layout(location = 5) in vec2 vLocalPos;
// Output
layout(location = 0) out vec4 fragColor;
@ -29,16 +32,30 @@ void main()
{
vec4 texColor = texture(coverTexture, vTexCoord);
// Apply shading: multiply texture by vColor.r to darken
float shadingAmount = vColor.r;
// Compute per-pixel shading using per-instance corner shading values
float leftUp = vInstanceShading.x;
float leftDown = vInstanceShading.y;
float rightUp = vInstanceShading.z;
float rightDown = vInstanceShading.w;
// For reflections, apply gradient fade (darker at bottom, fading to black)
// Use interpolated local vertex position to match original vertex-based shading.
// position.y in vertex ranges [-0.5..0.5], so map to [0..1] with +0.5
float y = clamp(vLocalPos.y + 0.5, 0.0, 1.0);
float x = clamp(vLocalPos.x + 0.5, 0.0, 1.0);
float leftShading = mix(leftDown, leftUp, y);
float rightShading = mix(rightDown, rightUp, y);
float shading = mix(leftShading, rightShading, x);
// Combine with per-instance opacity (opacity only darkens RGB, alpha preserved)
float shadingAmount = shading * vInstanceOpacity;
// For reflections, apply a gradient fade using reflection uniforms (darker further away)
if (vIsReflection > 0.5) {
// vTexCoord.y goes from 1 (top of reflection, near cover) to 0 (bottom, far from cover)
// We want it brightest near the cover and fading away
// Legacy reflection fade: ramp from 0.0 to 0.33 using texture V coordinate
float gradientFade = mix(0.0, 0.33, vTexCoord.y);
shadingAmount *= gradientFade;
}
// Final color: shaded RGB, keep source alpha
fragColor = vec4(texColor.rgb * shadingAmount, texColor.a);
}