21 lines
699 B
Plaintext
21 lines
699 B
Plaintext
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shader_type canvas_item;
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uniform sampler2D glyph_atlas : hint_normal;
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uniform vec2 tilemap_size = vec2(32.0, 20.0); // Update this to match the texture size
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// tile_atlas hardcoded to 64x4 tiles for now
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void fragment() {
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// GLES2
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vec2 xy = UV * tilemap_size; // Texel-space coord of our texture
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float t = texture(TEXTURE, UV).r;
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int tile_idx = int(t * 255.0); // Luminosity channel (any RGB channel works)
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// Convert tile_idx to a texel coordinate, then to a UV coordinate
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ivec2 tile_xy = ivec2(tile_idx%64, tile_idx/64);
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vec2 tile_uv = vec2(tile_xy)/64.0;
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// Get sub-tile UV
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vec2 sub_tile_uv = fract(xy);
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vec2 uv = tile_uv + (sub_tile_uv/64.0);
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COLOR = texture(glyph_atlas, uv);
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}
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