Clément Foucault
ffdb41a8bc
This change the attribute binding scheme to something similar to the curves objects. Attributes are now buffer textures sampled per points. The actual geometry is now rendered using an index buffer that avoid too many vertex shader invocation. Drawcall is wrapped in a DRW function to reduce complexity of future changes.
101 lines
2.3 KiB
GLSL
101 lines
2.3 KiB
GLSL
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/* NOTE: To be used with UNIFORM_RESOURCE_ID and INSTANCED_ATTR as define. */
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#pragma BLENDER_REQUIRE(common_view_lib.glsl)
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int pointcloud_get_point_id()
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{
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return gl_VertexID / 32;
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}
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mat3 pointcloud_get_facing_matrix(vec3 p)
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{
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mat3 facing_mat;
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facing_mat[2] = cameraVec(p);
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facing_mat[1] = normalize(cross(ViewMatrixInverse[0].xyz, facing_mat[2]));
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facing_mat[0] = cross(facing_mat[1], facing_mat[2]);
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return facing_mat;
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}
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/* Returns world center position and radius. */
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void pointcloud_get_pos_and_radius(out vec3 outpos, out float outradius)
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{
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int id = pointcloud_get_point_id();
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vec4 pos_rad = texelFetch(ptcloud_pos_rad_tx, id);
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outpos = point_object_to_world(pos_rad.xyz);
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outradius = dot(abs(mat3(ModelMatrix) * pos_rad.www), vec3(1.0 / 3.0));
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}
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/* Return world position and normal. */
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void pointcloud_get_pos_and_nor(out vec3 outpos, out vec3 outnor)
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{
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vec3 p;
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float radius;
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pointcloud_get_pos_and_radius(p, radius);
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mat3 facing_mat = pointcloud_get_facing_matrix(p);
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/** \note: Avoid modulo by non-power-of-two in shader. See Index buffer setup. */
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int vert_id = gl_VertexID % 32;
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vec3 pos_inst = vec3(0.0);
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switch (vert_id) {
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case 0:
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pos_inst.z = 1.0;
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break;
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case 1:
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pos_inst.x = 1.0;
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break;
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case 2:
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pos_inst.y = 1.0;
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break;
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case 3:
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pos_inst.x = -1.0;
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break;
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case 4:
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pos_inst.y = -1.0;
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break;
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}
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/* TODO(fclem): remove multiplication here. Here only for keeping the size correct for now. */
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radius *= 0.01;
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outnor = facing_mat * pos_inst;
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outpos = p + outnor * radius;
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}
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vec3 pointcloud_get_pos()
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{
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vec3 outpos, outnor;
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pointcloud_get_pos_and_nor(outpos, outnor);
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return outpos;
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}
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float pointcloud_get_customdata_float(const samplerBuffer cd_buf)
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{
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int id = pointcloud_get_point_id();
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return texelFetch(cd_buf, id).r;
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}
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vec2 pointcloud_get_customdata_vec2(const samplerBuffer cd_buf)
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{
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int id = pointcloud_get_point_id();
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return texelFetch(cd_buf, id).rg;
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}
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vec3 pointcloud_get_customdata_vec3(const samplerBuffer cd_buf)
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{
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int id = pointcloud_get_point_id();
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return texelFetch(cd_buf, id).rgb;
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}
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vec4 pointcloud_get_customdata_vec4(const samplerBuffer cd_buf)
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{
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int id = pointcloud_get_point_id();
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return texelFetch(cd_buf, id).rgba;
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}
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vec2 pointcloud_get_barycentric(void)
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{
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/* TODO: To be implemented. */
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return vec2(0.0);
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}
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