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Code Issues Releases Wiki Activity

Panini projection

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Zeno Rogue
2020-11-01 21:20:54 +01:00
parent 2cc06e39ba
commit 6513b3a87e
6 changed files with 104 additions and 17 deletions
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raycaster.cpp
+29 -8
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@@ -370,14 +370,34 @@ void enable_raycaster() {
" mediump mat4 vw = uStart * xzspin(-lambda) * xpush(eye) * yzspin(phi);\n"
" mediump vec4 at0 = vec4(0., 0., 1., 0.);\n";
else fmain +=
" mediump mat4 vw = uStart;\n"
" mediump vec4 at0 = at;\n"
" gl_FragColor = vec4(0,0,0,1);\n"
" mediump float left = 1.;\n"
" at0.y = -at.y;\n"
" at0.w = 0.;\n"
" at0.xyz = at0.xyz / length(at0.xyz);\n";
else {
fmain +=
" mediump mat4 vw = uStart;\n"
" mediump vec4 at0 = at;\n"
" gl_FragColor = vec4(0,0,0,1);\n"
" mediump float left = 1.;\n"
" at0.y = -at.y;\n"
" at0.w = 0.;\n";
if(panini_alpha) fmain +=
"mediump float hr = at0.x*at0.x;\n"
"mediump float alpha = " + to_glsl(panini_alpha) + ";\n"
"mediump float A = 1. + hr;\n"
"mediump float B = -2.*hr*alpha;\n"
"mediump float C = 1. - hr*alpha*alpha;\n"
"B /= A; C /= A;\n"
"mediump float hz = B / 2. + sqrt(C + B*B/4.);\n"
"if(abs(hz) > 1e-3) {"
"at0.xyz *= hz+alpha;\n"
"at0.z = hz;\n}"
" else at0.z = 0.;\n"
"\n"
;
fmain +=
" at0.xyz = at0.xyz / length(at0.xyz);\n";
}
if(hyperbolic) fsh += " mediump float len(mediump vec4 x) { return x[3]; }\n";
else if(sphere && rotspace) fsh += " mediump float len(mediump vec4 x) { return 1.+x.x*x.x+x.y*x.y-x.z*x.z-x.w*x.w; }\n";
@@ -1091,6 +1111,7 @@ void enable_raycaster() {
}
#ifndef GLES_ONLY
/* todo: fix for Panini */
fmain +=
" gl_FragDepth = (" + to_glsl(-vnear-vfar)+"+w*" + to_glsl(2*vnear*vfar)+"/z)/" + to_glsl(vnear-vfar)+";\n"
" gl_FragDepth = (gl_FragDepth + 1.) / 2.;\n";