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uniform sampler1D weightTex;
uniform vec4 color; /* Drawsize packed in alpha */
/* ---- Instantiated Attrs ---- */
in vec3 pos;
in int vclass;
/* ---- Per instance Attrs ---- */
in vec3 part_pos;
in vec4 part_rot;
in float part_val;
#ifdef USE_DOTS
out vec4 finalColor;
#else
flat out vec4 finalColor;
#endif
#define VCLASS_SCREENALIGNED (1 << 9)
#define VCLASS_EMPTY_AXES (1 << 11)
vec3 rotate(vec3 vec, vec4 quat)
{
/* The quaternion representation here stores the w component in the first index */
return vec + 2.0 * cross(quat.yzw, cross(quat.yzw, vec) + quat.x * vec);
}
void main()
{
float draw_size = color.a;
vec3 world_pos = part_pos;
#ifdef USE_DOTS
gl_Position = point_world_to_ndc(world_pos);
/* World sized points. */
gl_PointSize = sizePixel * draw_size * ProjectionMatrix[1][1] * sizeViewport.y / gl_Position.w;
#else
if ((vclass & VCLASS_SCREENALIGNED) != 0) {
/* World sized, camera facing geometry. */
world_pos += (screenVecs[0].xyz * pos.x + screenVecs[1].xyz * pos.y) * draw_size;
}
else {
world_pos += rotate(pos, part_rot) * draw_size;
}
gl_Position = point_world_to_ndc(world_pos);
#endif
/* Coloring */
if ((vclass & VCLASS_EMPTY_AXES) != 0) {
/* see VBO construction for explanation. */
finalColor = vec4(clamp(pos * 10000.0, 0.0, 1.0), 1.0);
}
else if (part_val < 0.0) {
finalColor = vec4(color.rgb, 1.0);
}
else {
finalColor = vec4(texture(weightTex, part_val).rgb, 1.0);
}
#ifdef USE_WORLD_CLIP_PLANES
world_clip_planes_calc_clip_distance(world_pos);
#endif
}
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