Differential D3675 Diff 11974 source/blender/draw/modes/shaders/paint_weight_frag.glsl

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				in vec2 weight_interp; /* (weight, alert) */

				out vec4 fragColor;

				uniform float opacity = 1.0;
				uniform sampler1D colorramp;

				void main()
				{
				float alert = weight_interp.y;
				vec4 color;

				/* Missing vertex group alert color */
				if (alert > 1.0) {
				color = colorVertexMissingData;
				}
				/* Weights are available */
				else {
				float weight = weight_interp.x;
				vec4 weight_color = texture(colorramp, weight, 0);

				/* Zero weight alert color. Nonlinear blend to reduce impact. */
				color = mix(weight_color, colorVertexUnreferenced, alert * alert);
				}

				/* See gpu_shader_multiply_and_blend_preprocessing.glsl */
				fragColor = vec4(color.rgb * opacity + (1 - opacity), 1.0);
				}