src/shaders/depthshader.frag

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#version 150

// ===== Uniforms =====

uniform sampler2D height_texUnit;   
uniform vec3 size;                  
uniform float maxDepth;             


// ===== In/Out params =====

in vec2 out_TexCoord;               
in vec3 out_ObjPos;                 

out vec4 out_Color;                 


// ===== Variables needed =====

float depth;                        
vec4 terrainDataUnderSurface;       


void main(void)
{
    // Texture lookup at fragment.
    terrainDataUnderSurface = texture(height_texUnit, out_TexCoord);

    // Depth at fragment.
    depth = out_ObjPos.y - size.y * terrainDataUnderSurface.a;
    
    if (depth < 0 || out_ObjPos.z < 1 || out_ObjPos.x < 1 )
    {
        discard;
    }
    
    out_Color = vec4(vec3(1.0, 1.0, 1.0) * (1 - depth / maxDepth), 1.0);
}