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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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25
common/rhi/shaders/flow.vert
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@ -12,11 +12,15 @@ layout(location = 5) in vec4 instanceModel_row3;
layout(location = 6) in vec4 instanceShading1;
layout(location = 7) in float instanceOpacity;
layout(location = 8) in float instanceFlip;
layout(location = 9) in float instanceRotation;
// Outputs to fragment shader
layout(location = 0) out vec2 vTexCoord;
layout(location = 1) out vec4 vColor;
layout(location = 2) out float vIsReflection;
layout(location = 1) out flat vec4 vInstanceShading;
layout(location = 2) out flat float vInstanceOpacity;
layout(location = 3) out flat float vIsReflection;
layout(location = 4) out flat float vInstanceRotation;
layout(location = 5) out vec2 vLocalPos;
// Uniform buffer
layout(std140, binding = 0) uniform UniformBuffer
@ -39,21 +43,16 @@ void main()
gl_Position = viewProjectionMatrix * instanceModel * vec4(position, 1.0);
vTexCoord = texCoord;
vLocalPos = position.xy;
// Flip texture vertically per-instance when requested (reflection)
if (instanceFlip != 0.0) {
vTexCoord.y = 1.0 - texCoord.y;
vTexCoord.y = 1.0 - vTexCoord.y;
}
float leftUpShading = instanceShading1.x;
float leftDownShading = instanceShading1.y;
float rightUpShading = instanceShading1.z;
float rightDownShading = instanceShading1.w;
float leftShading = mix(leftDownShading, leftUpShading, (position.y + 0.5));
float rightShading = mix(rightDownShading, rightUpShading, (position.y + 0.5));
float shading = mix(leftShading, rightShading, (position.x + 0.5));
vColor = vec4(shading * instanceOpacity);
// Pass per-instance values to fragment shader as flat (no interpolation)
vInstanceShading = instanceShading1;
vInstanceOpacity = instanceOpacity;
vIsReflection = instanceFlip;
vInstanceRotation = instanceRotation;
}