90 lines
2.6 KiB
GLSL
90 lines
2.6 KiB
GLSL
#extension GL_EXT_texture_array : require
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/*
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Copyright (c) 2013 yvt
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This file is part of OpenSpades.
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OpenSpades is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenSpades is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OpenSpades. If not, see <http://www.gnu.org/licenses/>.
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*/
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uniform mat4 projectionViewMatrix;
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uniform mat4 modelMatrix;
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uniform mat4 viewMatrix;
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uniform vec3 viewOrigin;
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uniform float fogDistance;
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// [x, y]
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attribute vec2 positionAttribute;
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varying vec3 fogDensity;
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varying vec3 screenPosition;
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varying vec3 viewPosition;
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varying vec3 worldPosition;
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varying vec2 worldPositionOriginal;
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uniform sampler2DArray waveTextureArray;
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void PrepareForShadow(vec3 worldOrigin, vec3 normal);
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vec4 FogDensity(float poweredLength);
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vec3 DisplaceWater(vec2 worldPos){
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vec4 waveCoord = worldPos.xyxy * vec4(vec2(0.04), vec2(0.08704))
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+ vec4(0., 0., 0.754, 0.1315);
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vec2 waveCoord2 = worldPos.xy * 0.00844 + vec2(.154, .7315);
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float wave = texture2DArrayLod(waveTextureArray, vec3(waveCoord.xy, 0.0), 0.).w;
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float disp = mix(-0.1, 0.1, wave) * 1.8;
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float wave2 = texture2DArrayLod(waveTextureArray, vec3(waveCoord.zw, 1.0), 0.).w;
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disp += mix(-0.1, 0.1, wave2) * 1.2;
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float wave3 = texture2DArrayLod(waveTextureArray, vec3(waveCoord2.xy, 2.0), 0.).w;
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disp += mix(-0.1, 0.1, wave3) * 2.5;
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vec2 waveDerivatives = texture2DArrayLod(waveTextureArray, vec3(waveCoord2.xy, 2.0), 3.).xy;
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vec2 dispHorz = (waveDerivatives - 0.5) * -2.;
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return vec3(dispHorz, disp * 4.);
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}
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void main() {
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vec4 vertexPos = vec4(positionAttribute.xy, 0., 1.);
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worldPosition = (modelMatrix * vertexPos).xyz;
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worldPositionOriginal = worldPosition.xy;
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worldPosition += DisplaceWater(worldPosition.xy);
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gl_Position = projectionViewMatrix * vec4(worldPosition, 1.);
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screenPosition = gl_Position.xyw;
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screenPosition.xy = (screenPosition.xy + screenPosition.z) * .5;
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vec4 viewPos = viewMatrix * vec4(worldPosition, 1.);
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vec2 horzRelativePos = worldPosition.xy - viewOrigin.xy;
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float horzDistance = dot(horzRelativePos, horzRelativePos);
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fogDensity = FogDensity(horzDistance).xyz;
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viewPosition = viewPos.xyz;
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PrepareForShadow(worldPosition, vec3(0., 0., -1.));
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}
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