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Effect framework (view source)

Revision as of 13:43, 7 February 2024

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== Uniforms passed to shaders outside the XML effect framework ==
== Uniforms passed to shaders outside the XML effect framework ==


{| class="wikitable"
Some uniforms are passed from C++ directly by the [[Compositor]], [[WS 3.0]], and others. See [[Compositor#Built-in uniforms|Compositor built-in uniforms]].
!Name
!Type
!Purpose
|-
|<tt>fg_ViewMatrix</tt>
|<tt>mat4</tt>
|In fullscreen pass only, view matrix used to transform from world to view space. Same as osg_ViewMatrix, but for fullscreen pass.
|-
|<tt>fg_ViewMatrixInverse</tt>
|<tt>mat4</tt>
|In fullscreen pass only, view matrix inverse used to transform from view to world space. Same as osg_ViewMatrixInverse but for fullscreen pass.
|-
|<tt>fg_ProjectionMatrixInverse</tt>
|<tt>mat4</tt>
|In fullscreen pass only, projection matrix inverse
|-
|<tt>fg_CameraPositionCart</tt>
|<tt>vec3</tt>
|Position of the camera in world space, expressed in cartesian coordinates
|-
|<tt>fg_CameraPositionGeod</tt>
|<tt>vec3</tt>
|Position of the camera in world space, expressed in geodesic coordinates (longitude in radians, latitude in radians, elevation in meters)
|-
|<tt>fg_SunAmbientColor</tt>
|<tt>vec4</tt>
|For fullscreen pass only, sun information as lightsource[0] is not available in fullscreen pass.
|-
|<tt>fg_SunDiffuseColor</tt>
|<tt>vec4</tt>
|For fullscreen pass only, sun information as lightsource[0] is not available in fullscreen pass.
|-
|<tt>fg_SunSpecularColor</tt>
|<tt>vec4</tt>
|For fullscreen pass only, sun information as lightsource[0] is not available in fullscreen pass.
|-
|<tt>fg_SunDirection</tt>
|<tt>vec3</tt>
|For fullscreen pass only, sun information as lightsource[0] is not available in fullscreen pass.
|-
|<tt>fg_FogColor</tt>
|<tt>vec4</tt>
|
|-
|<tt>fg_FogDensity</tt>
|<tt>float</tt>
|
|-
|<tt>fg_ShadowNumber</tt>
|<tt>int</tt>
|
|-
|<tt>fg_ShadowDistances</tt>
|<tt>vec4</tt>
|
|-
|<tt>fg_DepthInColor</tt>
|<tt>bool</tt>
|Tells if the depth is stored in a depth texture or a color texture
|-
|<tt>fg_Planes</tt>
|<tt>vec3</tt>
|Used to convert the value of the depth buffer to a depth that can be used to compute the eye space position of the fragment
|-
|<tt>fg_BufferSize</tt>
|<tt>vec2</tt>
|Dimensions of the buffer, used to convert gl_FragCoord into the range [0..1][0..1]
|-
|<tt>osg_ViewMatrix</tt>
|<tt>mat4</tt>
|Defined by OSG, used only when working on actual geometry. Transforms from world to view space.
|-
|<tt>osg_ViewMatrixInverse</tt>
|<tt>mat4</tt>
|Defined by OSG, used only when working on actual geometry. Transforms from view to world space.
|-
|<tt>osg_SimulationTime</tt>
|<tt>float</tt>
|Defined by OSG
|-
|<tt>osg_FrameTime</tt>
|<tt>float</tt>
|Defined by OSG
|-
|<tt>osg_DeltaFrameTime</tt>
|<tt>float</tt>
|Defined by OSG
|-
|<tt>osg_FrameTime</tt>
|<tt>float</tt>
|Defined by OSG
|-
|<tt>osg_FrameNumber</tt>
|<tt>int</tt>
|Defined by OSG
|}


== Related content ==
== Related content ==
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