com.io7m.r2.core.shaders.types

## Class R2ShaderLightScreenSingleVerifier<M extends R2LightScreenSingleType>

- java.lang.Object
- - com.io7m.r2.core.shaders.types.R2ShaderLightScreenSingleVerifier<M>

- Type Parameters:
    `M` - See `R2ShaderLightSingleType`
  All Implemented Interfaces:
    com.io7m.jcanephora.core.JCGLResourceUsableType, R2DeletableType, R2ShaderLightScreenSingleType<M>, R2ShaderLightScreenSingleUsableType<M>, R2ShaderLightSingleType<M>, R2ShaderLightSingleUsableType<M>, R2ShaderScreenType<M>, R2ShaderScreenUsableType<M>, R2ShaderType<M>, R2ShaderUsableType<M>

      public final class R2ShaderLightScreenSingleVerifier<M extends R2LightScreenSingleType>
      extends Object
      implements R2ShaderLightScreenSingleType<M>

  A verifier for single-instance volume light shaders; a type that verifies that a renderer has called all of the required methods in the correct order.

- - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `delete(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type g)` Delete the current object.
    `boolean` | `isDeleted()`
    `static <M extends R2LightScreenSingleType> R2ShaderLightScreenSingleType<M>` | `newVerifier(R2ShaderLightScreenSingleType<M> s)` Construct a new verifier for the given shader.
    `void` | `onActivate(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type g)` Activate the shader for rendering.
    `void` | `onDeactivate(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type g)` Deactivate the shader.
    `void` | `onReceiveBoundGeometryBufferTextures(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type g, R2GeometryBufferUsableType gbuffer, com.io7m.jcanephora.core.JCGLTextureUnitType unit_albedo, com.io7m.jcanephora.core.JCGLTextureUnitType unit_specular, com.io7m.jcanephora.core.JCGLTextureUnitType unit_depth, com.io7m.jcanephora.core.JCGLTextureUnitType unit_normals)` Set the bound geometry buffer textures for the current shader.
    `void` | `onReceiveValues(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type g, R2ShaderParametersLightType<M> light_parameters)` Set light values.
    `void` | `onValidate()` Validate the shader prior to executing a draw call.
    `long` | `shaderID()`
    `Class<M>` | `shaderParametersType()`
    `com.io7m.jcanephora.core.JCGLProgramShaderUsableType` | `shaderProgram()`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Method Detail

    - #### newVerifier

          public static <M extends R2LightScreenSingleType> R2ShaderLightScreenSingleType<M> newVerifier(R2ShaderLightScreenSingleType<M> s)

      Construct a new verifier for the given shader.
      Type Parameters:
        `M` - See `R2ShaderLightVolumeSingleType`
      Parameters:
        `s` - The shader
      Returns:
        A new verifier

    - #### delete

          public void delete(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type g)
                      throws R2Exception

      Description copied from interface: `R2DeletableType`
      Delete the current object.
      Specified by:
        `delete` in interface `R2DeletableType`
      Parameters:
        `g` - An OpenGL interface
      Throws:
        `R2Exception` - On errors

    - #### isDeleted

          public boolean isDeleted()

      Specified by:
        `isDeleted` in interface `com.io7m.jcanephora.core.JCGLResourceUsableType`

    - #### shaderID

          public long shaderID()

      Specified by:
        `shaderID` in interface `R2ShaderUsableType<M extends R2LightScreenSingleType>`
      Returns:
        The unique shader ID

    - #### shaderParametersType

          public Class<M> shaderParametersType()

      Specified by:
        `shaderParametersType` in interface `R2ShaderUsableType<M extends R2LightScreenSingleType>`
      Returns:
        The shader parameter type

    - #### shaderProgram

          public com.io7m.jcanephora.core.JCGLProgramShaderUsableType shaderProgram()

      Specified by:
        `shaderProgram` in interface `R2ShaderUsableType<M extends R2LightScreenSingleType>`
      Returns:
        The compiled shader program

    - #### onActivate

          public void onActivate(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type g)

      Description copied from interface: `R2ShaderUsableType`
      Activate the shader for rendering.
      Specified by:
        `onActivate` in interface `R2ShaderUsableType<M extends R2LightScreenSingleType>`
      Parameters:
        `g` - A GL interface

    - #### onValidate

          public void onValidate()
                          throws R2ExceptionShaderValidationFailed

      Description copied from interface: `R2ShaderUsableType`
      Validate the shader prior to executing a draw call. This method exists so that shader implementations can check that the caller has called all required methods before drawing.
      Specified by:
        `onValidate` in interface `R2ShaderUsableType<M extends R2LightScreenSingleType>`
      Throws:
        `R2ExceptionShaderValidationFailed` - If validation fails

    - #### onDeactivate

          public void onDeactivate(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type g)

      Description copied from interface: `R2ShaderUsableType`
      Deactivate the shader.
      Specified by:
        `onDeactivate` in interface `R2ShaderUsableType<M extends R2LightScreenSingleType>`
      Parameters:
        `g` - A GL interface

    - #### onReceiveBoundGeometryBufferTextures

          public void onReceiveBoundGeometryBufferTextures(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type g,
                                                           R2GeometryBufferUsableType gbuffer,
                                                           com.io7m.jcanephora.core.JCGLTextureUnitType unit_albedo,
                                                           com.io7m.jcanephora.core.JCGLTextureUnitType unit_specular,
                                                           com.io7m.jcanephora.core.JCGLTextureUnitType unit_depth,
                                                           com.io7m.jcanephora.core.JCGLTextureUnitType unit_normals)

      Description copied from interface: `R2ShaderLightSingleUsableType`

      Set the bound geometry buffer textures for the current shader.

      This method will be called exactly once between calls to `R2ShaderUsableType.onActivate(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type)` and `R2ShaderUsableType.onValidate()`.

      Specified by:
        `onReceiveBoundGeometryBufferTextures` in interface `R2ShaderLightSingleUsableType<M extends R2LightScreenSingleType>`
      Parameters:
        `g` - An OpenGL interface
        `gbuffer` - The geometry buffer
        `unit_albedo` - The texture unit to which the geometry buffer's albedo/emissive texture is bound
        `unit_specular` - The texture unit to which the geometry buffer's specular texture is bound
        `unit_depth` - The texture unit to which the geometry buffer's depth/stencil texture is bound
        `unit_normals` - The texture unit to which the geometry buffer's normal

    - #### onReceiveValues

          public void onReceiveValues(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type g,
                                      R2ShaderParametersLightType<M> light_parameters)

      Description copied from interface: `R2ShaderLightSingleUsableType`

      Set light values.

      This method will be called once for each light that uses the current shader.

      This method will be called after a call to `R2ShaderUsableType.onActivate(com.io7m.jcanephora.core.api.JCGLInterfaceGL33Type)` and before a call to `R2ShaderUsableType.onValidate()`.

      Specified by:
        `onReceiveValues` in interface `R2ShaderLightSingleUsableType<M extends R2LightScreenSingleType>`
      Parameters:
        `g` - An OpenGL interface
        `light_parameters` - The light parameters

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