Clément Foucault
a5644f9a28
This leaves some of the unresolved case where we still need both implementation.
82 lines
2.3 KiB
GLSL
82 lines
2.3 KiB
GLSL
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/* Values in GPU_shader.h. */
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#define GPU_KEYFRAME_SHAPE_DIAMOND (1 << 0)
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#define GPU_KEYFRAME_SHAPE_CIRCLE (1 << 1)
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#define GPU_KEYFRAME_SHAPE_CLIPPED_VERTICAL (1 << 2)
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#define GPU_KEYFRAME_SHAPE_CLIPPED_HORIZONTAL (1 << 3)
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#define GPU_KEYFRAME_SHAPE_INNER_DOT (1 << 4)
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#define GPU_KEYFRAME_SHAPE_ARROW_END_MAX (1 << 8)
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#define GPU_KEYFRAME_SHAPE_ARROW_END_MIN (1 << 9)
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#define GPU_KEYFRAME_SHAPE_ARROW_END_MIXED (1 << 10)
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#define GPU_KEYFRAME_SHAPE_SQUARE \
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(GPU_KEYFRAME_SHAPE_CLIPPED_VERTICAL | GPU_KEYFRAME_SHAPE_CLIPPED_HORIZONTAL)
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const float line_falloff = 1.0;
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const float circle_scale = sqrt(2.0 / 3.1416);
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const float square_scale = sqrt(0.5);
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const float diagonal_scale = sqrt(0.5);
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bool test(int bit)
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{
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return (flags & bit) != 0;
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}
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vec2 line_thresholds(float width)
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{
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return vec2(max(0.0, width - line_falloff), width);
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}
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void main()
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{
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gl_Position = ModelViewProjectionMatrix * vec4(pos, 0.0, 1.0);
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/* Align to pixel grid if the viewport size is known. */
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if (ViewportSize.x > 0) {
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vec2 scale = ViewportSize * 0.5;
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vec2 px_pos = (gl_Position.xy + 1) * scale;
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vec2 adj_pos = round(px_pos - 0.5) + 0.5;
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gl_Position.xy = adj_pos / scale - 1;
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}
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/* Pass through parameters. */
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finalColor = color;
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finalOutlineColor = outlineColor;
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finalFlags = flags;
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if (!test(GPU_KEYFRAME_SHAPE_DIAMOND | GPU_KEYFRAME_SHAPE_CIRCLE |
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GPU_KEYFRAME_SHAPE_CLIPPED_VERTICAL | GPU_KEYFRAME_SHAPE_CLIPPED_HORIZONTAL)) {
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finalFlags |= GPU_KEYFRAME_SHAPE_DIAMOND;
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}
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/* Size-dependent line thickness. */
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float half_width = (0.06 + (size - 10) * 0.04);
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float line_width = half_width + line_falloff;
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/* Outline thresholds. */
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thresholds.xy = line_thresholds(line_width * outline_scale);
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/* Inner dot thresholds. */
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thresholds.zw = line_thresholds(line_width * 1.6);
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/* Extend the primitive size by half line width on either side; odd for symmetry. */
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float ext_radius = round(0.5 * size) + thresholds.x;
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gl_PointSize = ceil(ext_radius + thresholds.y) * 2 + 1;
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/* Diamond radius. */
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radii[0] = ext_radius * diagonal_scale;
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/* Circle radius. */
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radii[1] = ext_radius * circle_scale;
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/* Square radius. */
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radii[2] = round(ext_radius * square_scale);
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/* Min/max cutout offset. */
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radii[3] = -line_falloff;
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/* Convert to PointCoord units. */
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radii /= gl_PointSize;
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thresholds /= gl_PointSize;
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}
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