Jeroen Bakker
7bc300a74b
When using Vertex or Weight paint mode on a wireframe the overlay was blended with the background. In this case we now use alpha blending. Reviewed By: fclem Differential Revision: https://developer.blender.org/D5340
106 lines
3.1 KiB
GLSL
106 lines
3.1 KiB
GLSL
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in vec2 weight_interp; /* (weight, alert) */
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out vec4 fragColor;
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uniform float opacity = 1.0;
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uniform sampler1D colorramp;
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uniform bool drawContours = false;
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float contours(float value, float steps, float width_px, float max_rel_width, float gradient)
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{
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/* Minimum visible and minimum full strength line width in screen space for fade out. */
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const float min_width_px = 1.3, fade_width_px = 2.3;
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/* Line is thinner towards the increase in the weight gradient by this factor. */
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const float hi_bias = 2.0;
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/* Don't draw lines at 0 or 1. */
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float rel_value = value * steps;
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if (rel_value < 0.5 || rel_value > steps - 0.5) {
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return 0.0;
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}
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/* Check if completely invisible due to fade out. */
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float rel_gradient = gradient * steps;
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float rel_min_width = min_width_px * rel_gradient;
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if (max_rel_width <= rel_min_width) {
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return 0.0;
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}
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/* Main shape of the line, accounting for width bias and maximum weight space width. */
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float rel_width = width_px * rel_gradient;
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float offset = fract(rel_value + 0.5) - 0.5;
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float base_alpha = 1.0 - max(offset * hi_bias, -offset) / min(max_rel_width, rel_width);
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/* Line fadeout when too thin in screen space. */
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float rel_fade_width = fade_width_px * rel_gradient;
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float fade_alpha = (max_rel_width - rel_min_width) / (rel_fade_width - rel_min_width);
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return clamp(base_alpha, 0.0, 1.0) * clamp(fade_alpha, 0.0, 1.0);
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}
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vec4 contour_grid(float weight, float weight_gradient)
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{
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/* Fade away when the gradient is too low to avoid big fills and noise. */
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float flt_eps = max(1e-8, 1e-6 * weight);
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if (weight_gradient <= flt_eps) {
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return vec4(0.0);
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}
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/* Three levels of grid lines */
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float grid10 = contours(weight, 10.0, 5.0, 0.3, weight_gradient);
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float grid100 = contours(weight, 100.0, 3.5, 0.35, weight_gradient) * 0.6;
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float grid1000 = contours(weight, 1000.0, 2.5, 0.4, weight_gradient) * 0.25;
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/* White lines for 0.1 and 0.01, and black for 0.001 */
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vec4 grid = vec4(1.0) * max(grid10, grid100);
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grid.a = max(grid.a, grid1000);
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return grid * clamp((weight_gradient - flt_eps) / flt_eps, 0.0, 1.0);
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}
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void main()
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{
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float alert = weight_interp.y;
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vec4 color;
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/* Missing vertex group alert color. Uniform in practice. */
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if (alert > 1.1) {
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color = colorVertexMissingData;
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}
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/* Weights are available */
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else {
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float weight = weight_interp.x;
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vec4 weight_color = texture(colorramp, weight, 0);
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/* Contour display */
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if (drawContours) {
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/* This must be executed uniformly for all fragments */
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float weight_gradient = length(vec2(dFdx(weight), dFdy(weight)));
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vec4 grid = contour_grid(weight, weight_gradient);
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weight_color = grid + weight_color * (1 - grid.a);
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}
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/* Zero weight alert color. Nonlinear blend to reduce impact. */
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color = mix(weight_color, colorVertexUnreferenced, alert * alert);
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}
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#ifdef DRW_STATE_BLEND_ALPHA
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/* alpha blending mix */
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fragColor = vec4(color.rgb, opacity);
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#else
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/* mix with 1.0 -> is like opacity when using multiply blend mode */
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fragColor = vec4(mix(vec3(1.0), color.rgb, opacity), 1.0);
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#endif
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}
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