mirror of
https://github.com/overte-org/overte.git
synced 2025-04-26 08:16:30 +02:00
62 lines
2.3 KiB
GLSL
62 lines
2.3 KiB
GLSL
#version 120
|
|
|
|
//
|
|
// metavoxel_voxel_splat.vert
|
|
// vertex 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 splat textures scales on the S axis
|
|
uniform vec4 splatTextureScalesS;
|
|
|
|
// the splat texture scales on the T axis
|
|
uniform vec4 splatTextureScalesT;
|
|
|
|
// the lower bounds of the values corresponding to the splat textures
|
|
uniform vec4 textureValueMinima;
|
|
|
|
// the upper bounds of the values corresponding to the splat textures
|
|
uniform vec4 textureValueMaxima;
|
|
|
|
// the materials to apply to the vertex
|
|
attribute vec4 materials;
|
|
|
|
// the weights of each material
|
|
attribute vec4 materialWeights;
|
|
|
|
// alpha values for the four splat textures
|
|
varying vec4 alphaValues;
|
|
|
|
void main(void) {
|
|
// use the fixed-function position
|
|
gl_Position = ftransform();
|
|
|
|
// pass along the scaled/offset texture coordinates
|
|
vec4 textureSpacePosition = vec4(gl_Vertex.xz, 0.0, 1.0);
|
|
gl_TexCoord[0] = textureSpacePosition * vec4(splatTextureScalesS[0], splatTextureScalesT[0], 0.0, 1.0);
|
|
gl_TexCoord[1] = textureSpacePosition * vec4(splatTextureScalesS[1], splatTextureScalesT[1], 0.0, 1.0);
|
|
gl_TexCoord[2] = textureSpacePosition * vec4(splatTextureScalesS[2], splatTextureScalesT[2], 0.0, 1.0);
|
|
gl_TexCoord[3] = textureSpacePosition * vec4(splatTextureScalesS[3], splatTextureScalesT[3], 0.0, 1.0);
|
|
|
|
// compute the alpha values for each texture
|
|
float value = materials[0];
|
|
vec4 valueVector = vec4(value, value, value, value);
|
|
alphaValues = step(textureValueMinima, valueVector) * step(valueVector, textureValueMaxima) * materialWeights[0];
|
|
|
|
value = materials[1];
|
|
valueVector = vec4(value, value, value, value);
|
|
alphaValues += step(textureValueMinima, valueVector) * step(valueVector, textureValueMaxima) * materialWeights[1];
|
|
|
|
value = materials[2];
|
|
valueVector = vec4(value, value, value, value);
|
|
alphaValues += step(textureValueMinima, valueVector) * step(valueVector, textureValueMaxima) * materialWeights[2];
|
|
|
|
value = materials[3];
|
|
valueVector = vec4(value, value, value, value);
|
|
alphaValues += step(textureValueMinima, valueVector) * step(valueVector, textureValueMaxima) * materialWeights[3];
|
|
}
|