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openmw/files/shaders/compatibility/terrain.vert

74 lines
2.1 KiB
GLSL

#version 120
#if @useUBO
#extension GL_ARB_uniform_buffer_object : require
#endif
#if @useGPUShader4
#extension GL_EXT_gpu_shader4: require
#endif
#include "lib/core/vertex.h.glsl"
varying vec2 uv;
varying float euclideanDepth;
varying float linearDepth;
#define PER_PIXEL_LIGHTING (@normalMap || @specularMap || @forcePPL)
#if !PER_PIXEL_LIGHTING
centroid varying vec3 passLighting;
centroid varying vec3 passSpecular;
centroid varying vec3 shadowDiffuseLighting;
centroid varying vec3 shadowSpecularLighting;
#endif
varying vec3 passViewPos;
varying vec3 passNormal;
#include "vertexcolors.glsl"
#include "shadows_vertex.glsl"
#include "compatibility/normals.glsl"
#include "lib/light/lighting.glsl"
#include "lib/view/depth.glsl"
void main(void)
{
gl_Position = modelToClip(gl_Vertex);
vec4 viewPos = modelToView(gl_Vertex);
gl_ClipVertex = viewPos;
euclideanDepth = length(viewPos.xyz);
linearDepth = getLinearDepth(gl_Position.z, viewPos.z);
passColor = gl_Color;
passNormal = gl_Normal.xyz;
passViewPos = viewPos.xyz;
normalToViewMatrix = gl_NormalMatrix;
#if @normalMap
mat3 tbnMatrix = generateTangentSpace(vec4(1.0, 0.0, 0.0, 1.0), passNormal);
tbnMatrix[0] = normalize(cross(tbnMatrix[2], tbnMatrix[1])); // note, now we need to re-cross to derive tangent again because it wasn't orthonormal
normalToViewMatrix *= tbnMatrix;
#endif
#if !PER_PIXEL_LIGHTING || @shadows_enabled
vec3 viewNormal = normalize(gl_NormalMatrix * passNormal);
#endif
#if !PER_PIXEL_LIGHTING
vec3 diffuseLight, ambientLight, specularLight;
doLighting(viewPos.xyz, viewNormal, gl_FrontMaterial.shininess, diffuseLight, ambientLight, specularLight, shadowDiffuseLighting, shadowSpecularLighting);
passLighting = getDiffuseColor().xyz * diffuseLight + getAmbientColor().xyz * ambientLight + getEmissionColor().xyz;
passSpecular = getSpecularColor().xyz * specularLight;
clampLightingResult(passLighting);
shadowDiffuseLighting *= getDiffuseColor().xyz;
shadowSpecularLighting *= getSpecularColor().xyz;
#endif
uv = gl_MultiTexCoord0.xy;
#if (@shadows_enabled)
setupShadowCoords(viewPos, viewNormal);
#endif
}