Joshua Leung
72a360827b
This commit restores support for Motion Path drawing in 2.8 (as it wasn't ported over to the new draw engines earlier, and the existing space_view3d/drawanimviz.c code was removed during the Blender Internal removal). Notes: * Motion Paths are now implemented as an overlay (enabled by default). Therefore, you can turn all of them on/off from the "Overlays" popover * By and large, we have kept the same draw style as was used in 2.7 Further changes can happen later following further design work. * One change from 2.7 is that thicker lines are used by default (2px vs 1px) Todo's: * There are some bad-level calls introduced here (i.e. the actgroup_to_keylist() stuff). These were introduced to optimise drawing performance (by avoiding full keyframes -> keylist conversion step on each drawcall). Instead, this has been moved to the calculation step (in blenkernel). Soon, there will be some cleanups/improvements with those functions, so until then, we'll keep the bad level calls. Credits: * Clément Foucault (fclem) - Draw Engine magic + Shader Conversion/Optimisation * Joshua Leung (Aligorith) - COW fixes, UI integration, etc. Revision History: See "tmp-b28-motionpath_drawing" branch (rBa12ab5b2ef49ccacae091ccb54d72de0d63f990d)
39 lines
1.0 KiB
GLSL
39 lines
1.0 KiB
GLSL
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layout(lines) in;
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layout(triangle_strip, max_vertices = 4) out;
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uniform mat4 ProjectionMatrix;
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uniform vec2 viewportSize;
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uniform int lineThickness = 2;
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in vec4 finalColor_geom[];
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in vec2 ssPos[];
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out vec4 finalColor;
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vec2 compute_dir(vec2 v0, vec2 v1)
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{
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vec2 dir = normalize(v1 - v0 + 1e-8);
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dir = vec2(-dir.y, dir.x);
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return dir;
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}
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void main(void)
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{
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vec2 t;
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vec2 edge_dir = compute_dir(ssPos[0], ssPos[1]) / viewportSize;
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bool is_persp = (ProjectionMatrix[3][3] == 0.0);
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finalColor = finalColor_geom[0];
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t = edge_dir * (float(lineThickness) * (is_persp ? gl_in[0].gl_Position.w : 1.0));
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gl_Position = gl_in[0].gl_Position + vec4(t, 0.0, 0.0); EmitVertex();
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gl_Position = gl_in[0].gl_Position - vec4(t, 0.0, 0.0); EmitVertex();
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finalColor = finalColor_geom[1];
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t = edge_dir * (float(lineThickness) * (is_persp ? gl_in[1].gl_Position.w : 1.0));
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gl_Position = gl_in[1].gl_Position + vec4(t, 0.0, 0.0); EmitVertex();
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gl_Position = gl_in[1].gl_Position - vec4(t, 0.0, 0.0); EmitVertex();
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EndPrimitive();
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}
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