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precision highp float;
#define PI 3.1415926535897932384626433832795
#define FOVY (90.0 * PI / 180.0)
uniform mat4 CameraRotation; // From camera space to world space.
uniform float Flip;
layout (location = 0) in vec2 vPosition;
out vec3 Ray;
// DEBUG
// out vec2 Texcoord;
// This is very similar to the skyquad vertex shader.
//
// The ray is not normalized because it isn't necessary for cubemap sampling.
//
// We also use a fixed fovy = 90 degrees because we want the frustum to pass
// exactly through each face of the cube. The aspect ratio is also just 1.
vec3 sky_ray(vec2 FilmPosition)
{
float d = 0.5 / tan(FOVY/2.0);
return vec3(FilmPosition, -d);
}
void main()
{
vec2 FilmPosition = vPosition * 0.5; // map [-1,1] -> [-1/2, +1/2]
FilmPosition *= Flip;
Ray = mat3(CameraRotation) * sky_ray(FilmPosition);
// TODO: Should disable depth test when rendering.
gl_Position = vec4(vPosition, 0.99999, 1.0); // z=1 -> send to background
// DEBUG
// Texcoord = FilmPosition + 0.5;
// Texcoord.y = 1.0 - Texcoord.y;
}
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