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[carveJwlIkooP6JGAAIwe30JlM.git] / shaders / blit.h

diff --git a/shaders/blit.h b/shaders/blit.h
index f05194eb3b299fc9045eb7c59ca52a633d31ef0f..12a0dcb2c293823f2b21104175ac7252c56b2b34 100644 (file)
--- a/shaders/blit.h
+++ b/shaders/blit.h
@@ -7,7 +7,7 @@ static struct vg_shader _shader_blit = {
    .link = shader_blit_link,
    .vs = 
 {
-.orig_file = "../shaders/blit.vs",
+.orig_file = "shaders/blit.vs",
 .static_src = 
 "layout (location=0) in vec2 a_co;\n"
 "out vec2 aUv;\n"
@@ -20,15 +20,47 @@ static struct vg_shader _shader_blit = {
 ""},
    .fs = 
 {
-.orig_file = "../shaders/blit.fs",
+.orig_file = "shaders/blit.fs",
 .static_src = 
 "out vec4 FragColor;\n"
 "uniform sampler2D uTexMain;\n"
 "\n"
 "in vec2 aUv;\n"
 "\n"
+"float kPi = 3.14159265358979;\n"
+"\n"
+"vec2 fisheye_distort(vec2 xy)\n"
+"{\n"
+"   float aperture = 1350.0;\n"
+"   float apertureHalf = 0.5 * aperture * (kPi / 180.0);\n"
+"   float maxFactor = sin(apertureHalf);\n"
+"\n"
+"   vec2 uv;\n"
+"   float d = length(xy);\n"
+"   if(d < (2.0-maxFactor))\n"
+"   {\n"
+"      d = length(xy * maxFactor);\n"
+"      float z = sqrt(1.0 - d * d);\n"
+"      float r = atan(d, z) / kPi;\n"
+"      float phi = atan(xy.y, xy.x);\n"
+"\n"
+"      uv.x = r * cos(phi) + 0.5;\n"
+"      uv.y = r * sin(phi) + 0.5;\n"
+"   }\n"
+"   else\n"
+"   {\n"
+"      uv = 0.5*xy + 0.5;\n"
+"   }\n"
+"   \n"
+"   return uv;\n"
+"}\n"
+"\n"
+"\n"
 "void main()\n"
 "{\n"
+"   vec2 vwarp = 2.0*aUv - 1.0;\n"
+"   vwarp = fisheye_distort( vwarp );\n"
+"\n"
 "   FragColor = texture( uTexMain, aUv );\n"
 "}\n"
 ""},
@@ -36,7 +68,7 @@ static struct vg_shader _shader_blit = {
 
 static GLuint _uniform_blit_uTexMain;
 static void shader_blit_uTexMain(int i){
-   glUniform1i( _uniform_blit_uTexMain, i );
+   glUniform1i(_uniform_blit_uTexMain,i);
 }
 static void shader_blit_register(void){
    vg_shader_register( &_shader_blit );