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26 lines
557 B
26 lines
557 B
4 years ago
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#version 450
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layout(set = 0, binding = 0) uniform sampler2D tex;
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layout(location = 0) in vec2 uv;
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layout(location = 0) out vec4 out_color;
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layout(push_constant) uniform UBO {
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layout(offset = 80) float alpha;
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} data;
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void main() {
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out_color = textureLod(tex, uv, 0);
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// We expect this shader to output pre-alpha-multiplied color values.
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// alpha < 0.0 means that this shader should ignore the texture's alpha
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// value.
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if (data.alpha < 0.0) {
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out_color.a = -data.alpha;
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out_color.rgb *= -data.alpha;
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} else {
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out_color *= data.alpha;
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}
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}
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