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366 lines
10 KiB
C++
366 lines
10 KiB
C++
#include "pass.hpp"
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#include <sstream>
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#include <string>
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#include <unordered_set>
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#include <osg/BindImageTexture>
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#include <osg/FrameBufferObject>
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#include <osg/Program>
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#include <osg/Shader>
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#include <osg/State>
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#include <osg/StateSet>
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#include <components/resource/scenemanager.hpp>
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#include <components/sceneutil/clearcolor.hpp>
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#include <components/sceneutil/lightmanager.hpp>
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#include <components/sceneutil/util.hpp>
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#include <components/stereo/multiview.hpp>
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#include "stateupdater.hpp"
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#include "technique.hpp"
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namespace
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{
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constexpr char s_DefaultVertex[] = R"GLSL(
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#if OMW_USE_BINDINGS
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omw_In vec2 omw_Vertex;
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#endif
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omw_Out vec2 omw_TexCoord;
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void main()
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{
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omw_Position = vec4(omw_Vertex.xy, 0.0, 1.0);
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omw_TexCoord = omw_Position.xy * 0.5 + 0.5;
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})GLSL";
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constexpr char s_DefaultVertexMultiview[] = R"GLSL(
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layout(num_views = 2) in;
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#if OMW_USE_BINDINGS
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omw_In vec2 omw_Vertex;
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#endif
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omw_Out vec2 omw_TexCoord;
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void main()
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{
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omw_Position = vec4(omw_Vertex.xy, 0.0, 1.0);
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omw_TexCoord = omw_Position.xy * 0.5 + 0.5;
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})GLSL";
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}
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namespace fx
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{
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Pass::Pass(Pass::Type type, Pass::Order order, bool ubo)
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: mCompiled(false)
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, mType(type)
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, mOrder(order)
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, mLegacyGLSL(true)
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, mUBO(ubo)
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{
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}
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std::string Pass::getPassHeader(Technique& technique, std::string_view preamble, bool fragOut)
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{
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std::string header = R"GLSL(
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#version @version @profile
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@extensions
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@uboStruct
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#define OMW_REVERSE_Z @reverseZ
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#define OMW_RADIAL_FOG @radialFog
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#define OMW_EXPONENTIAL_FOG @exponentialFog
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#define OMW_HDR @hdr
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#define OMW_NORMALS @normals
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#define OMW_USE_BINDINGS @useBindings
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#define OMW_MULTIVIEW @multiview
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#define omw_In @in
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#define omw_Out @out
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#define omw_Position @position
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#define omw_Texture1D @texture1D
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#define omw_Texture2D @texture2D
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#define omw_Texture3D @texture3D
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#define omw_Vertex @vertex
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#define omw_FragColor @fragColor
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@fragBinding
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uniform @builtinSampler omw_SamplerLastShader;
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uniform @builtinSampler omw_SamplerLastPass;
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uniform @builtinSampler omw_SamplerDepth;
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uniform @builtinSampler omw_SamplerNormals;
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uniform vec4 omw_PointLights[@pointLightCount];
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uniform int omw_PointLightsCount;
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#if OMW_MULTIVIEW
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uniform mat4 projectionMatrixMultiView[2];
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uniform mat4 invProjectionMatrixMultiView[2];
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#endif
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int omw_GetPointLightCount()
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{
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return omw_PointLightsCount;
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}
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vec3 omw_GetPointLightWorldPos(int index)
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{
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return omw_PointLights[(index * 3)].xyz;
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}
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vec3 omw_GetPointLightDiffuse(int index)
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{
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return omw_PointLights[(index * 3) + 1].xyz;
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}
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vec3 omw_GetPointLightAttenuation(int index)
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{
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return omw_PointLights[(index * 3) + 2].xyz;
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}
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float omw_GetPointLightRadius(int index)
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{
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return omw_PointLights[(index * 3) + 2].w;
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}
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#if @ubo
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layout(std140) uniform _data { _omw_data omw; };
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#else
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uniform _omw_data omw;
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#endif
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mat4 omw_ProjectionMatrix()
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{
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#if OMW_MULTIVIEW
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return projectionMatrixMultiView[gl_ViewID_OVR];
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#else
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return omw.projectionMatrix;
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#endif
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}
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mat4 omw_InvProjectionMatrix()
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{
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#if OMW_MULTIVIEW
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return invProjectionMatrixMultiView[gl_ViewID_OVR];
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#else
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return omw.invProjectionMatrix;
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#endif
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}
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float omw_GetDepth(vec2 uv)
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{
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#if OMW_MULTIVIEW
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float depth = omw_Texture2D(omw_SamplerDepth, vec3(uv, gl_ViewID_OVR)).r;
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#else
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float depth = omw_Texture2D(omw_SamplerDepth, uv).r;
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#endif
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#if OMW_REVERSE_Z
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return 1.0 - depth;
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#else
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return depth;
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#endif
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}
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vec4 omw_GetLastShader(vec2 uv)
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{
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#if OMW_MULTIVIEW
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return omw_Texture2D(omw_SamplerLastShader, vec3(uv, gl_ViewID_OVR));
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#else
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return omw_Texture2D(omw_SamplerLastShader, uv);
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#endif
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}
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vec4 omw_GetLastPass(vec2 uv)
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{
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#if OMW_MULTIVIEW
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return omw_Texture2D(omw_SamplerLastPass, vec3(uv, gl_ViewID_OVR));
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#else
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return omw_Texture2D(omw_SamplerLastPass, uv);
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#endif
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}
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vec3 omw_GetNormals(vec2 uv)
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{
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#if OMW_MULTIVIEW
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return omw_Texture2D(omw_SamplerNormals, vec3(uv, gl_ViewID_OVR)).rgb * 2.0 - 1.0;
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#else
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return omw_Texture2D(omw_SamplerNormals, uv).rgb * 2.0 - 1.0;
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#endif
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}
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vec3 omw_GetWorldPosFromUV(vec2 uv)
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{
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float depth = omw_GetDepth(uv);
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#if (OMW_REVERSE_Z == 1)
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float flippedDepth = 1.0 - depth;
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#else
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float flippedDepth = depth * 2.0 - 1.0;
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#endif
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vec4 clip_space = vec4(uv * 2.0 - 1.0, flippedDepth, 1.0);
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vec4 world_space = omw.invViewMatrix * (omw.invProjectionMatrix * clip_space);
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return world_space.xyz / world_space.w;
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}
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float omw_GetLinearDepth(vec2 uv)
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{
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#if (OMW_REVERSE_Z == 1)
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float depth = omw_GetDepth(uv);
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float dist = omw.near * omw.far / (omw.far + depth * (omw.near - omw.far));
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#else
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float depth = omw_GetDepth(uv) * 2.0 - 1.0;
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float dist = 2.0 * omw.near * omw.far / (omw.far + omw.near - depth * (omw.far - omw.near));
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#endif
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return dist;
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}
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float omw_EstimateFogCoverageFromUV(vec2 uv)
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{
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#if OMW_RADIAL_FOG
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vec3 uvPos = omw_GetWorldPosFromUV(uv);
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float dist = length(uvPos - omw.eyePos.xyz);
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#else
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float dist = omw_GetLinearDepth(uv);
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#endif
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#if OMW_EXPONENTIAL_FOG
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float fogValue = 1.0 - exp(-2.0 * max(0.0, dist - omw.fogNear/2.0) / (omw.fogFar - omw.fogNear/2.0));
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#else
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float fogValue = clamp((dist - omw.fogNear) / (omw.fogFar - omw.fogNear), 0.0, 1.0);
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#endif
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return fogValue;
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}
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#if OMW_HDR
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uniform sampler2D omw_EyeAdaptation;
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#endif
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float omw_GetEyeAdaptation()
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{
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#if OMW_HDR
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return omw_Texture2D(omw_EyeAdaptation, vec2(0.5, 0.5)).r;
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#else
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return 1.0;
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#endif
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}
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)GLSL";
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std::stringstream extBlock;
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for (const auto& extension : technique.getGLSLExtensions())
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extBlock << "#ifdef " << extension << '\n'
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<< "\t#extension " << extension << ": enable" << '\n'
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<< "#endif" << '\n';
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const std::vector<std::pair<std::string, std::string>> defines
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= { { "@pointLightCount", std::to_string(SceneUtil::PPLightBuffer::sMaxPPLightsArraySize) },
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{ "@version", std::to_string(technique.getGLSLVersion()) },
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{ "@multiview", Stereo::getMultiview() ? "1" : "0" },
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{ "@builtinSampler", Stereo::getMultiview() ? "sampler2DArray" : "sampler2D" },
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{ "@profile", technique.getGLSLProfile() }, { "@extensions", extBlock.str() },
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{ "@uboStruct", StateUpdater::getStructDefinition() }, { "@ubo", mUBO ? "1" : "0" },
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{ "@normals", technique.getNormals() ? "1" : "0" },
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{ "@reverseZ", SceneUtil::AutoDepth::isReversed() ? "1" : "0" },
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{ "@radialFog", Settings::Manager::getBool("radial fog", "Fog") ? "1" : "0" },
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{ "@exponentialFog", Settings::Manager::getBool("exponential fog", "Fog") ? "1" : "0" },
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{ "@hdr", technique.getHDR() ? "1" : "0" }, { "@in", mLegacyGLSL ? "varying" : "in" },
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{ "@out", mLegacyGLSL ? "varying" : "out" }, { "@position", "gl_Position" },
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{ "@texture1D", mLegacyGLSL ? "texture1D" : "texture" },
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{ "@texture2D", mLegacyGLSL ? "texture2D" : "texture" },
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{ "@texture3D", mLegacyGLSL ? "texture3D" : "texture" },
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{ "@vertex", mLegacyGLSL ? "gl_Vertex" : "_omw_Vertex" },
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{ "@fragColor", mLegacyGLSL ? "gl_FragColor" : "_omw_FragColor" },
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{ "@useBindings", mLegacyGLSL ? "0" : "1" },
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{ "@fragBinding", mLegacyGLSL ? "" : "out vec4 omw_FragColor;" } };
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for (const auto& [define, value] : defines)
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for (size_t pos = header.find(define); pos != std::string::npos; pos = header.find(define))
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header.replace(pos, define.size(), value);
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for (const auto& target : mRenderTargets)
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header.append("uniform sampler2D " + std::string(target) + ";");
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for (auto& uniform : technique.getUniformMap())
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if (auto glsl = uniform->getGLSL())
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header.append(glsl.value());
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header.append(preamble);
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return header;
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}
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void Pass::prepareStateSet(osg::StateSet* stateSet, const std::string& name) const
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{
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osg::ref_ptr<osg::Program> program = new osg::Program;
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if (mType == Type::Pixel)
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{
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program->addShader(new osg::Shader(*mVertex));
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program->addShader(new osg::Shader(*mFragment));
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}
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else if (mType == Type::Compute)
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{
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program->addShader(new osg::Shader(*mCompute));
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}
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if (mUBO)
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program->addBindUniformBlock("_data", static_cast<int>(Resource::SceneManager::UBOBinding::PostProcessor));
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program->setName(name);
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if (!mLegacyGLSL)
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{
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program->addBindFragDataLocation("_omw_FragColor", 0);
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program->addBindAttribLocation("_omw_Vertex", 0);
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}
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stateSet->setAttribute(program);
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if (mBlendSource && mBlendDest)
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stateSet->setAttributeAndModes(new osg::BlendFunc(mBlendSource.value(), mBlendDest.value()));
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if (mBlendEq)
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stateSet->setAttributeAndModes(new osg::BlendEquation(mBlendEq.value()));
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if (mClearColor)
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stateSet->setAttributeAndModes(new SceneUtil::ClearColor(mClearColor.value(), GL_COLOR_BUFFER_BIT));
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}
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void Pass::dirty()
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{
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mVertex = nullptr;
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mFragment = nullptr;
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mCompute = nullptr;
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mCompiled = false;
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}
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void Pass::compile(Technique& technique, std::string_view preamble)
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{
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if (mCompiled)
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return;
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mLegacyGLSL = technique.getGLSLVersion() != 330;
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if (mType == Type::Pixel)
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{
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if (!mVertex)
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mVertex = new osg::Shader(
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osg::Shader::VERTEX, Stereo::getMultiview() ? s_DefaultVertexMultiview : s_DefaultVertex);
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mVertex->setShaderSource(getPassHeader(technique, preamble).append(mVertex->getShaderSource()));
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mFragment->setShaderSource(getPassHeader(technique, preamble, true).append(mFragment->getShaderSource()));
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mVertex->setName(mName);
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mFragment->setName(mName);
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}
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else if (mType == Type::Compute)
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{
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mCompute->setShaderSource(getPassHeader(technique, preamble).append(mCompute->getShaderSource()));
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mCompute->setName(mName);
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}
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mCompiled = true;
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}
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}
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