19 lines
573 B
Plaintext
19 lines
573 B
Plaintext
shader_type canvas_item;
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//uniform usampler2D tex;
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uniform sampler2D palette;
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const float index_scale = 255.0 / 16.0;
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void fragment() {
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// GLES3
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/*uint color_idx = uint(textureLod(TEXTURE, UV, 0.0).r * 255.0);
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COLOR = texelFetch(palette, ivec2(int(color_idx), 0), 0);
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if (color_idx == uint(0))
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COLOR.a = 0.0;*/
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// GLES2
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float color_idx16 = texture(TEXTURE, UV).r * index_scale;
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float row = trunc(color_idx16) / 16.0;
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float col = fract(color_idx16);
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COLOR = texture(palette, vec2(col, row));
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COLOR.a = step(0.000001, color_idx16); // Branchless transparency
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}
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