20 lines
723 B
Text
20 lines
723 B
Text
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// Load in a texture from a sampler2D with an offset and scale
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// See examples/place_texture.gdshader
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vec4 place_texture(sampler2D sampler, vec2 uv, vec2 texture_pixel_size, vec2 offset, vec2 scale) {
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vec2 texture_size = vec2(textureSize(sampler, 0));
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// position of current pixel; sample color c
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vec2 pos = (uv - offset) / (texture_size*texture_pixel_size) / scale;
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vec4 c = texture(sampler, pos);
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// top-left bounds
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vec2 a = offset;
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// bottom-right bounds
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vec2 b = offset + (texture_size*texture_pixel_size) * scale;
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// check bounds
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if (
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a.x < uv.x && a.y < uv.y
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&& b.x > uv.x && b.y > uv.y
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) { return c; } // within bounds -> return color
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return vec4(0); // not within bounds -> return transparency
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}
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