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This commit is contained in:
luboslenco
2020-03-09 23:48:12 +01:00
parent 4cbadfefd1
commit f7f77a525e
13 changed files with 186 additions and 81 deletions
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Shaders/painter/glsl/cursor.vert.glsl
+26 -14
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@@ -4,18 +4,19 @@ uniform mat4 invVP;
uniform vec2 mouse;
uniform vec2 texStep;
uniform float radius;
uniform vec3 cameraRight;
uniform sampler2D gbufferD;
in vec4 pos;
in vec2 nor;
in vec2 tex;
out vec2 texCoord;
mat3 rotAxis(vec3 axis, float a) {
float c = cos(a);
vec3 as = axis * sin(a);
mat3 p = mat3(axis.x * axis, axis.y * axis, axis.z * axis);
mat3 q = mat3(c, -as.z, as.y, as.z, c, -as.x, -as.y, as.x, c);
return p * (1.0 - c) + q;
}
// mat3 rotAxis(vec3 axis, float a) {
// float c = cos(a);
// vec3 as = axis * sin(a);
// mat3 p = mat3(axis.x * axis, axis.y * axis, axis.z * axis);
// mat3 q = mat3(c, -as.z, as.y, as.z, c, -as.x, -as.y, as.x, c);
// return p * (1.0 - c) + q;
// }
vec3 getPos(vec2 uv) {
float depth = textureLod(gbufferD, uv, 0.0).r;
vec4 wpos = vec4(uv * 2.0 - 1.0, depth * 2.0 - 1.0, 1.0);
@@ -27,6 +28,10 @@ vec3 getNormal(vec3 p0, vec2 uv) {
vec3 p2 = getPos(uv + vec2(0, texStep.y * 4));
return normalize(cross(p2 - p0, p1 - p0));
}
void createBasis(vec3 normal, out vec3 tangent, out vec3 binormal) {
tangent = normalize(cameraRight - normal * dot(cameraRight, normal));
binormal = cross(tangent, normal);
}
void main() {
texCoord = tex;
vec3 wpos = getPos(mouse);
@@ -39,12 +44,19 @@ void main() {
getNormal(wpos1, uv1) +
getNormal(wpos2, uv2)
);
float ax = acos(dot(vec3(1,0,0), vec3(n.x,0,0)));
float az = acos(dot(vec3(0,0,1), vec3(0,0,n.z)));
float sy = -sign(n.y);
wpos +=
rotAxis(vec3(1,0,0), -az * sy + 3.14/2) *
rotAxis(vec3(0,0,1), ax + 3.14/2) *
(pos.xyz * radius);
// float ax = acos(dot(vec3(1,0,0), vec3(n.x,0,0)));
// float az = acos(dot(vec3(0,0,1), vec3(0,0,n.z)));
// float sy = -sign(n.y);
// wpos +=
// rotAxis(vec3(1,0,0), -az * sy + 3.14/2) *
// rotAxis(vec3(0,0,1), ax + 3.14/2) *
// (pos.xyz * radius);
vec3 n_tan;
vec3 n_bin;
createBasis(n, n_tan, n_bin);
if (gl_VertexID == 0) wpos += normalize(-n_tan - n_bin) * 0.7 * radius;
else if (gl_VertexID == 1) wpos += normalize( n_tan - n_bin) * 0.7 * radius;
else if (gl_VertexID == 2) wpos += normalize( n_tan + n_bin) * 0.7 * radius;
else if (gl_VertexID == 3) wpos += normalize(-n_tan + n_bin) * 0.7 * radius;
gl_Position = VP * vec4(wpos, 1.0);
}