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uniform mat4 ModelViewProjectionMatrix;
uniform mat4 ModelViewMatrix;
uniform mat4 ProjectionMatrix;
uniform mat3 NormalMatrix;
uniform vec2 wireStepParam;
uniform vec2 viewportSize;
uniform float nearDist;
uniform samplerBuffer vertData;
uniform isamplerBuffer faceIds;
#ifdef USE_GEOM_SHADER
out vec2 ssPos;
out float facingOut; /* abs(facing) > 1.0 if we do edge */
#else
flat out vec3 ssVec0;
flat out vec3 ssVec1;
flat out vec3 ssVec2;
out float facing;
#endif
#ifdef LIGHT_EDGES
#ifdef USE_GEOM_SHADER
out vec3 obPos;
out vec3 edgeAdj;
#else
flat out vec3 edgeSharpness;
#endif
#endif
/* project to screen space */
vec2 proj(vec4 pos)
{
return (0.5 * (pos.xy / pos.w) + 0.5) * viewportSize;
}
vec3 compute_vec(vec2 v0, vec2 v1)
{
vec2 v = normalize(v1 - v0);
v = vec2(-v.y, v.x);
return vec3(v, -dot(v, v0));
}
float short_to_unit_float(uint s)
{
int value = int(s) & 0x7FFF;
if ((s & 0x8000u) != 0u) {
value |= ~0x7FFF;
}
return float(value) / float(0x7FFF);
}
vec3 get_vertex_nor(int v_id)
{
v_id *= 5; /* See vertex format for explanation. */
/* Fetch compressed normal as float and unpack them. */
vec2 data;
data.x = texelFetch(vertData, v_id + 3).r;
data.y = texelFetch(vertData, v_id + 4).r;
uvec2 udata = floatBitsToUint(data);
vec3 nor;
nor.x = short_to_unit_float(udata.x & 0xFFFFu);
nor.y = short_to_unit_float(udata.x >> 16u);
nor.z = short_to_unit_float(udata.y & 0xFFFFu);
return nor;
}
vec3 get_vertex_pos(int v_id)
{
v_id *= 5; /* See vertex format for explanation. */
vec3 pos;
pos.x = texelFetch(vertData, v_id).r;
pos.y = texelFetch(vertData, v_id + 1).r;
pos.z = texelFetch(vertData, v_id + 2).r;
return pos;
}
float get_edge_sharpness(vec3 e0, vec3 e1, vec3 e2)
{
vec3 n0 = normalize(cross(e0, e1));
vec3 n1 = normalize(cross(e1, e2));
return dot(n0, n1);
}
#define NO_EDGE vec3(10000.0);
void main()
{
#ifdef USE_GEOM_SHADER
# ifdef LIGHT_EDGES
int v_id = texelFetch(faceIds, gl_VertexID * 2).r;
# else
int v_id = texelFetch(faceIds, gl_VertexID).r;
# endif
bool do_edge = v_id < 0;
v_id = abs(v_id) - 1;
vec3 pos = get_vertex_pos(v_id);
vec3 nor = get_vertex_nor(v_id);
facingOut = normalize(NormalMatrix * nor).z;
facingOut += (do_edge) ? ((facingOut > 0.0) ? 2.0 : -2.0) : 0.0;
gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
ssPos = proj(gl_Position);
# ifdef LIGHT_EDGES
int adj_id = texelFetch(faceIds, gl_VertexID * 2 + 1).r;
obPos = pos;
edgeAdj = get_vertex_pos(adj_id);
# endif
#else
# ifdef LIGHT_EDGES
int v_0 = (gl_VertexID / 3) * 6;
ivec2 ofs = ivec2(2, 4); /* GL_TRIANGLE_ADJACENCY */
# else
int v_0 = (gl_VertexID / 3) * 3;
ivec2 ofs = ivec2(1, 2); /* GL_TRIANGLES */
# endif
int v_n = gl_VertexID % 3;
/* Getting the same positions for each of the 3 verts. */
ivec3 v_id;
v_id.x = texelFetch(faceIds, v_0).r;
v_id.y = texelFetch(faceIds, v_0 + ofs.x).r;
v_id.z = texelFetch(faceIds, v_0 + ofs.y).r;
bvec3 do_edge = lessThan(v_id, ivec3(0));
v_id = abs(v_id) - 1;
vec3 pos[3];
pos[0] = get_vertex_pos(v_id.x);
pos[1] = get_vertex_pos(v_id.y);
pos[2] = get_vertex_pos(v_id.z);
vec4 p_pos[3];
p_pos[0] = ModelViewProjectionMatrix * vec4(pos[0], 1.0);
p_pos[1] = ModelViewProjectionMatrix * vec4(pos[1], 1.0);
p_pos[2] = ModelViewProjectionMatrix * vec4(pos[2], 1.0);
vec2 ss_pos[3];
ss_pos[0] = proj(p_pos[0]);
ss_pos[1] = proj(p_pos[1]);
ss_pos[2] = proj(p_pos[2]);
/* Compute the edges screen vectors */
ssVec0 = do_edge.x ? compute_vec(ss_pos[0], ss_pos[1]) : NO_EDGE;
ssVec1 = do_edge.y ? compute_vec(ss_pos[1], ss_pos[2]) : NO_EDGE;
ssVec2 = do_edge.z ? compute_vec(ss_pos[2], ss_pos[0]) : NO_EDGE;
gl_Position = p_pos[v_n];
vec3 nor = get_vertex_nor(v_id[v_n]);
facing = normalize(NormalMatrix * nor).z;
# ifdef LIGHT_EDGES
ivec3 adj_id;
adj_id.x = texelFetch(faceIds, v_0 + 1).r;
adj_id.y = texelFetch(faceIds, v_0 + 3).r;
adj_id.z = texelFetch(faceIds, v_0 + 5).r;
vec3 adj_pos[3];
adj_pos[0] = get_vertex_pos(adj_id.x);
adj_pos[1] = get_vertex_pos(adj_id.y);
adj_pos[2] = get_vertex_pos(adj_id.z);
vec3 edges[3];
edges[0] = pos[1] - pos[0];
edges[1] = pos[2] - pos[1];
edges[2] = pos[0] - pos[2];
edgeSharpness.x = get_edge_sharpness(adj_pos[0] - pos[0], edges[0], -edges[2]);
edgeSharpness.y = get_edge_sharpness(adj_pos[1] - pos[1], edges[1], -edges[0]);
edgeSharpness.z = get_edge_sharpness(adj_pos[2] - pos[2], edges[2], -edges[1]);
/* Easy to adjust parameters. */
edgeSharpness = smoothstep(wireStepParam.xxx, wireStepParam.yyy, edgeSharpness);
# endif
#endif
}
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