1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/vr/vr_sdr.h	Sun Nov 24 14:00:14 2013 +0200
     1.3 @@ -0,0 +1,45 @@
     1.4 +static const char *sdr_src =
     1.5 +	"uniform sampler2D tex;\n"
     1.6 +	"uniform float aspect, scale;\n"
     1.7 +	"uniform float lens_center_offset;\n"
     1.8 +	"uniform vec4 dist_factors;\n"
     1.9 +	"\n"
    1.10 +	"vec2 distort_texcoords(in vec2 tc);\n"
    1.11 +	"float barrel_scale(float x, in vec4 k);\n"
    1.12 +	"\n"
    1.13 +	"void main()\n"
    1.14 +	"{\n"
    1.15 +	"	vec2 tc = distort_texcoords(gl_TexCoord[0].xy);\n"
    1.16 +	"\n"
    1.17 +	"	float vis = any(greaterThan(tc, vec2(1.0)) || lessThan(tc, vec2(0.0))) ? 0.0 : 1.0;\n"
    1.18 +	"\n"
    1.19 +	"	gl_FragColor.rgb = texture2D(tex, tc).rgb * vis;\n"
    1.20 +	"	gl_FragColor.a = 1.0;\n"
    1.21 +	"}\n"
    1.22 +	"\n"
    1.23 +	"vec2 distort_texcoords(in vec2 tc)\n"
    1.24 +	"{\n"
    1.25 +	"	// map tc [0, 1] -> [-1, 1]\n"
    1.26 +	"	vec2 pt = tc * 2.0 - 1.0;\n"
    1.27 +	"\n"
    1.28 +	"	pt.x += lens_center_offset * 2.0;\n"
    1.29 +	"	pt.y /= aspect;	// correct for aspect ratio\n"
    1.30 +	"\n"
    1.31 +	"	float rad = barrel_scale(dot(pt, pt), dist_factors);\n"
    1.32 +	"	pt *= rad;	// scale the point by the computer distortion radius\n"
    1.33 +	"\n"
    1.34 +	"	pt /= scale;\n"
    1.35 +	"	pt.y *= aspect;\n"
    1.36 +	"	pt.x -= lens_center_offset * 2.0;\n"
    1.37 +	"\n"
    1.38 +	"	// map back to range [0, 1]\n"
    1.39 +	"	return pt * 0.5 + 0.5;\n"
    1.40 +	"}\n"
    1.41 +	"\n"
    1.42 +	"float barrel_scale(float rad, in vec4 k)\n"
    1.43 +	"{\n"
    1.44 +	"	float radsq = rad * rad;\n"
    1.45 +	"	float radquad = radsq * radsq;\n"
    1.46 +	"	return k.x + k.y * radsq + k.z * radquad + k.w * radquad * radsq;\n"
    1.47 +	"}\n";
    1.48 +