#version 410

uniform float yRatio; // height/width
uniform float eyePos;
uniform mat4 cameraMatrix;

in vec3 pos;
in vec2 uv;

out vec2 uvV;

void main(void)
{
    float yRatioScaler = yRatio > 1.0 ? 1.0 : yRatio;
    float xMore = yRatio / yRatioScaler;
    float yMore = 1.0 / yRatioScaler;
    float zFixer = -150.0; // we flip & compress Z for the final depth write. Our world is all in RHS, negative Z from screen. Device is +Z.
    // matrix is actually transpose of how it "looks" here...
    mat4 projectionMatrix = mat4(xMore, 0,     0, 0,
                                 0,     yMore, 0, 0,
                                 0,     0,     1.0 / zFixer, -1.0 / eyePos,
                                 0,     0,     eyePos / zFixer, 0);
    
    mat4 transformMatrix = projectionMatrix * cameraMatrix;
    vec4 a = vec4(pos,1);
    a = transformMatrix * a;
    gl_Position = a;
    uvV = uv;
}