Clément Foucault
e000dcb849
This new method is only enabled if Overlay Smooth Wire is enabled.
This method gives really nice results but has some downside:
- Require a depth copy or loose the ability to write wire depth to the
depth buffer and have correct depth ordering of wires. This patch use the former, with its associated cost.
- Require some depth sampling and prevent early depth test (i.e: has
some performance impact).
- Has some relatively minor instability with geometry that are perpendicular
to the view and intersecting with other geometry.
Pros:
- Compared to a fullpass approach this is surely going to have less
performance impact and much higher quality.
- Removes the additional vertex offset. (see T74961)
- Fixes all half edges z-fighting.
{F8428014}
{F8428015}
Reviewed By: brecht
Differential Revision: https://developer.blender.org/D7233
56 lines
1.5 KiB
GLSL
56 lines
1.5 KiB
GLSL
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/* Scene Depth texture copy for manual depth test. */
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uniform sampler2D depthTex;
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flat in vec2 edgeStart;
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#ifndef SELECT_EDGES
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in vec3 finalColor;
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noperspective in vec2 edgePos;
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layout(location = 0) out vec4 fragColor;
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layout(location = 1) out vec4 lineOutput;
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#endif
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void main()
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{
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/* Needed only because of wireframe slider.
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* If we could get rid of it would be nice because of performance drain of discard. */
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if (edgeStart.r == -1.0) {
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discard;
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}
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#ifndef SELECT_EDGES
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lineOutput = pack_line_data(gl_FragCoord.xy, edgeStart, edgePos);
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fragColor.rgb = finalColor;
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fragColor.a = 1.0;
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# ifdef CUSTOM_DEPTH_BIAS
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vec2 dir = lineOutput.xy * 2.0 - 1.0;
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bool dir_horiz = abs(dir.x) > abs(dir.y);
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vec2 uv = gl_FragCoord.xy * sizeViewportInv.xy;
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float depth_occluder = texture(depthTex, uv).r;
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float depth_min = depth_occluder;
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if (dir_horiz) {
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depth_min = min(depth_min, texture(depthTex, uv + vec2(-sizeViewportInv.x, 0.0)).r);
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depth_min = min(depth_min, texture(depthTex, uv + vec2(sizeViewportInv.x, 0.0)).r);
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}
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else {
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depth_min = min(depth_min, texture(depthTex, uv + vec2(0, -sizeViewportInv.y)).r);
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depth_min = min(depth_min, texture(depthTex, uv + vec2(0, sizeViewportInv.y)).r);
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}
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float delta = abs(depth_occluder - depth_min);
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if (gl_FragCoord.z < (depth_occluder + delta) && gl_FragCoord.z > depth_occluder) {
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gl_FragDepth = depth_occluder;
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}
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else {
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gl_FragDepth = gl_FragCoord.z;
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}
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# endif
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#endif
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}
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