mirror of
https://github.com/overte-org/overte.git
synced 2025-06-29 05:30:57 +02:00
37 lines
1.3 KiB
GLSL
37 lines
1.3 KiB
GLSL
#version 120
|
|
|
|
//
|
|
// metavoxel_voxel_splat.frag
|
|
// fragment shader
|
|
//
|
|
// Created by Andrzej Kapolka on 9/4/14.
|
|
// Copyright 2014 High Fidelity, Inc.
|
|
//
|
|
// Distributed under the Apache License, Version 2.0.
|
|
// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
|
|
//
|
|
|
|
// the number of splats per pass
|
|
const int SPLAT_COUNT = 4;
|
|
|
|
// the splat textures
|
|
uniform sampler2D diffuseMaps[SPLAT_COUNT];
|
|
|
|
// the model space normal
|
|
varying vec3 normal;
|
|
|
|
// alpha values for the four splat textures
|
|
varying vec4 alphaValues;
|
|
|
|
void main(void) {
|
|
// determine the cube face to use for texture coordinate generation
|
|
vec3 absNormal = abs(normal);
|
|
vec3 steps = step(absNormal.zzy, absNormal.xyx);
|
|
vec2 parameters = mix(vec2(0.0, steps.y), vec2(steps.x, steps.x), steps.z);
|
|
|
|
// blend the splat textures
|
|
gl_FragColor = (texture2D(diffuseMaps[0], mix(gl_TexCoord[0].xy, gl_TexCoord[0].zw, parameters)) * alphaValues.x +
|
|
texture2D(diffuseMaps[1], mix(gl_TexCoord[1].xy, gl_TexCoord[1].zw, parameters)) * alphaValues.y +
|
|
texture2D(diffuseMaps[2], mix(gl_TexCoord[2].xy, gl_TexCoord[2].zw, parameters)) * alphaValues.z +
|
|
texture2D(diffuseMaps[3], mix(gl_TexCoord[3].xy, gl_TexCoord[3].zw, parameters)) * alphaValues.w);
|
|
}
|