90 lines
3 KiB
GLSL
90 lines
3 KiB
GLSL
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/*
|
|
* This file is part of the LibreOffice project.
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
*/
|
|
#define MAX_LIGHT_NUM 8
|
|
|
|
varying vec3 positionWorldspace;
|
|
varying vec3 normalCameraspace;
|
|
|
|
uniform mat4 V;
|
|
uniform vec4 materialAmbient;
|
|
uniform vec4 materialDiffuse;
|
|
uniform vec4 materialSpecular;
|
|
uniform vec4 materialColor;
|
|
uniform int twoSidesLighting;
|
|
uniform float materialShininess;
|
|
uniform vec4 lightColor[MAX_LIGHT_NUM];
|
|
uniform vec4 lightPosWorldspace[MAX_LIGHT_NUM];
|
|
uniform float lightPower[MAX_LIGHT_NUM];
|
|
uniform int lightNum;
|
|
uniform vec4 lightAmbient;
|
|
uniform int undraw;
|
|
uniform float minCoordX;
|
|
|
|
void main()
|
|
{
|
|
if ((positionWorldspace.x <= minCoordX) && (undraw == 1))
|
|
discard;
|
|
vec3 colorTotal = vec3(0.0f, 0.0f, 0.0f);
|
|
|
|
vec3 vertexPositionCameraspace = (V * vec4(positionWorldspace,1)).xyz;
|
|
|
|
vec3 MaterialDiffuseColor = materialColor.rgb;
|
|
|
|
vec3 normalDirectionCameraspace = normalCameraspace;
|
|
vec3 eyeDirectionCameraspace = normalize(vec3(0, 0, 0) - vertexPositionCameraspace);
|
|
float attenuation = 1.0;
|
|
int i = 0;
|
|
vec3 lightDirectionCameraspace;
|
|
vec3 vertexToLightSource;
|
|
|
|
vec3 totalAmbient = lightAmbient.rgb *
|
|
MaterialDiffuseColor *
|
|
materialAmbient.rgb;
|
|
|
|
if ((twoSidesLighting == 1) && (!gl_FrontFacing))
|
|
{
|
|
normalDirectionCameraspace = -normalDirectionCameraspace;
|
|
}
|
|
for (i = 0; i < lightNum; i++)
|
|
{
|
|
float LightPower = lightPower[i];
|
|
lightDirectionCameraspace = normalize((V * lightPosWorldspace[i]).xyz);
|
|
|
|
float cosTheta = clamp(dot(normalDirectionCameraspace,lightDirectionCameraspace), 0,1);
|
|
vec3 lightDiffuse = LightPower *
|
|
attenuation *
|
|
lightColor[i].rgb *
|
|
MaterialDiffuseColor *
|
|
materialDiffuse.rgb *
|
|
cosTheta;
|
|
|
|
vec3 specularReflection;
|
|
if (dot(normalDirectionCameraspace, lightDirectionCameraspace) < 0)
|
|
{
|
|
specularReflection = vec3(0.0, 0.0, 0.0);
|
|
}
|
|
else
|
|
{
|
|
vec3 R = reflect(-lightDirectionCameraspace,normalDirectionCameraspace);
|
|
float cosAlpha = clamp(dot(eyeDirectionCameraspace, R), 0,1);
|
|
specularReflection = attenuation *
|
|
LightPower *
|
|
lightColor[i].rgb *
|
|
materialSpecular.rgb *
|
|
MaterialDiffuseColor *
|
|
pow(max(0.0, cosAlpha), materialShininess);
|
|
}
|
|
colorTotal += lightDiffuse + specularReflection;
|
|
|
|
}
|
|
colorTotal += totalAmbient;
|
|
gl_FragColor = vec4(colorTotal, 1.0);
|
|
}
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|