Package org.lwjgl.opengl

Class ARBShaderImageLoadStore

java.lang.Object
org.lwjgl.opengl.ARBShaderImageLoadStore
public class ARBShaderImageLoadStore extends Object
Native bindings to the ARB_shader_image_load_store extension.

This extension provides GLSL built-in functions allowing shaders to load from, store to, and perform atomic read-modify-write operations to a single level of a texture object from any shader stage. These built-in functions are named imageLoad(), imageStore(), and imageAtomic*(), respectively, and accept integer texel coordinates to identify the texel accessed. The extension adds the notion of "image units" to the OpenGL API, to which texture levels are bound for access by the GLSL built-in functions. To allow shaders to specify the image unit to access, GLSL provides a new set of data types ("image*") similar to samplers. Each image variable is assigned an integer value to identify an image unit to access, which is specified using Uniform*() APIs in a manner similar to samplers.

This extension also provides the capability to explicitly enable "early" per-fragment tests, where operations like depth and stencil testing are performed prior to fragment shader execution. In unextended OpenGL, fragment shaders never have any side effects and implementations can sometimes perform per-fragment tests and discard some fragments prior to executing the fragment shader. Since this extension allows fragment shaders to write to texture and buffer object memory using the built-in image functions, such optimizations could lead to non-deterministic results. To avoid this, implementations supporting this extension may not perform such optimizations on shaders having such side effects. However, enabling early per-fragment tests guarantees that such tests will be performed prior to fragment shader execution, and ensures that image stores and atomics will not be performed by fragment shader invocations where these per-fragment tests fail.

Finally, this extension provides both a GLSL built-in function and an OpenGL API function allowing applications some control over the ordering of image loads, stores, and atomics relative to other OpenGL pipeline operations accessing the same memory. Because the extension provides the ability to perform random accesses to texture or buffer object memory, such accesses are not easily tracked by the OpenGL driver. To avoid the need for heavy-handed synchronization at the driver level, this extension requires manual synchronization. The MemoryBarrier() OpenGL API function allows applications to specify a bitfield indicating the set of OpenGL API operations to synchronize relative to shader memory access. The memoryBarrier() GLSL built-in function provides a synchronization point within a given shader invocation to ensure that all memory accesses performed prior to the synchronization point complete prior to any started after the synchronization point.

Requires OpenGL 3.0 and GLSL 1.30. Promoted to core in OpenGL 4.2.

  • Field Details

    • GL_MAX_IMAGE_UNITS

      public static final int GL_MAX_IMAGE_UNITS
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev, and GetInteger64v.
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    • GL_MAX_COMBINED_IMAGE_UNITS_AND_FRAGMENT_OUTPUTS

      public static final int GL_MAX_COMBINED_IMAGE_UNITS_AND_FRAGMENT_OUTPUTS
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev, and GetInteger64v.
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    • GL_MAX_IMAGE_SAMPLES

      public static final int GL_MAX_IMAGE_SAMPLES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev, and GetInteger64v.
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    • GL_MAX_VERTEX_IMAGE_UNIFORMS

      public static final int GL_MAX_VERTEX_IMAGE_UNIFORMS
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev, and GetInteger64v.
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    • GL_MAX_TESS_CONTROL_IMAGE_UNIFORMS

      public static final int GL_MAX_TESS_CONTROL_IMAGE_UNIFORMS
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev, and GetInteger64v.
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    • GL_MAX_TESS_EVALUATION_IMAGE_UNIFORMS

      public static final int GL_MAX_TESS_EVALUATION_IMAGE_UNIFORMS
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev, and GetInteger64v.
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    • GL_MAX_GEOMETRY_IMAGE_UNIFORMS

      public static final int GL_MAX_GEOMETRY_IMAGE_UNIFORMS
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev, and GetInteger64v.
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    • GL_MAX_FRAGMENT_IMAGE_UNIFORMS

      public static final int GL_MAX_FRAGMENT_IMAGE_UNIFORMS
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev, and GetInteger64v.
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    • GL_MAX_COMBINED_IMAGE_UNIFORMS

      public static final int GL_MAX_COMBINED_IMAGE_UNIFORMS
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev, and GetInteger64v.
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    • GL_IMAGE_BINDING_NAME

      public static final int GL_IMAGE_BINDING_NAME
      Accepted by the target parameter of GetIntegeri_v and GetBooleani_v.
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    • GL_IMAGE_BINDING_LEVEL

      public static final int GL_IMAGE_BINDING_LEVEL
      Accepted by the target parameter of GetIntegeri_v and GetBooleani_v.
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    • GL_IMAGE_BINDING_LAYERED

      public static final int GL_IMAGE_BINDING_LAYERED
      Accepted by the target parameter of GetIntegeri_v and GetBooleani_v.
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    • GL_IMAGE_BINDING_LAYER

      public static final int GL_IMAGE_BINDING_LAYER
      Accepted by the target parameter of GetIntegeri_v and GetBooleani_v.
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    • GL_IMAGE_BINDING_ACCESS

      public static final int GL_IMAGE_BINDING_ACCESS
      Accepted by the target parameter of GetIntegeri_v and GetBooleani_v.
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    • GL_IMAGE_BINDING_FORMAT

      public static final int GL_IMAGE_BINDING_FORMAT
      Accepted by the target parameter of GetIntegeri_v and GetBooleani_v.
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    • GL_VERTEX_ATTRIB_ARRAY_BARRIER_BIT

      public static final int GL_VERTEX_ATTRIB_ARRAY_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_ELEMENT_ARRAY_BARRIER_BIT

      public static final int GL_ELEMENT_ARRAY_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_UNIFORM_BARRIER_BIT

      public static final int GL_UNIFORM_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_TEXTURE_FETCH_BARRIER_BIT

      public static final int GL_TEXTURE_FETCH_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_SHADER_IMAGE_ACCESS_BARRIER_BIT

      public static final int GL_SHADER_IMAGE_ACCESS_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_COMMAND_BARRIER_BIT

      public static final int GL_COMMAND_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_PIXEL_BUFFER_BARRIER_BIT

      public static final int GL_PIXEL_BUFFER_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_TEXTURE_UPDATE_BARRIER_BIT

      public static final int GL_TEXTURE_UPDATE_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_BUFFER_UPDATE_BARRIER_BIT

      public static final int GL_BUFFER_UPDATE_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_FRAMEBUFFER_BARRIER_BIT

      public static final int GL_FRAMEBUFFER_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_TRANSFORM_FEEDBACK_BARRIER_BIT

      public static final int GL_TRANSFORM_FEEDBACK_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_ATOMIC_COUNTER_BARRIER_BIT

      public static final int GL_ATOMIC_COUNTER_BARRIER_BIT
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_ALL_BARRIER_BITS

      public static final int GL_ALL_BARRIER_BITS
      Accepted by the barriers parameter of MemoryBarrier.
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    • GL_IMAGE_1D

      public static final int GL_IMAGE_1D
      Returned by the type parameter of GetActiveUniform.
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    • GL_IMAGE_2D

      public static final int GL_IMAGE_2D
      Returned by the type parameter of GetActiveUniform.
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    • GL_IMAGE_3D

      public static final int GL_IMAGE_3D
      Returned by the type parameter of GetActiveUniform.
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    • GL_IMAGE_2D_RECT

      public static final int GL_IMAGE_2D_RECT
      Returned by the type parameter of GetActiveUniform.
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    • GL_IMAGE_CUBE

      public static final int GL_IMAGE_CUBE
      Returned by the type parameter of GetActiveUniform.
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    • GL_IMAGE_BUFFER

      public static final int GL_IMAGE_BUFFER
      Returned by the type parameter of GetActiveUniform.
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    • GL_IMAGE_1D_ARRAY

      public static final int GL_IMAGE_1D_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_IMAGE_2D_ARRAY

      public static final int GL_IMAGE_2D_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_IMAGE_CUBE_MAP_ARRAY

      public static final int GL_IMAGE_CUBE_MAP_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_IMAGE_2D_MULTISAMPLE

      public static final int GL_IMAGE_2D_MULTISAMPLE
      Returned by the type parameter of GetActiveUniform.
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    • GL_IMAGE_2D_MULTISAMPLE_ARRAY

      public static final int GL_IMAGE_2D_MULTISAMPLE_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_INT_IMAGE_1D

      public static final int GL_INT_IMAGE_1D
      Returned by the type parameter of GetActiveUniform.
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    • GL_INT_IMAGE_2D

      public static final int GL_INT_IMAGE_2D
      Returned by the type parameter of GetActiveUniform.
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    • GL_INT_IMAGE_3D

      public static final int GL_INT_IMAGE_3D
      Returned by the type parameter of GetActiveUniform.
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    • GL_INT_IMAGE_2D_RECT

      public static final int GL_INT_IMAGE_2D_RECT
      Returned by the type parameter of GetActiveUniform.
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    • GL_INT_IMAGE_CUBE

      public static final int GL_INT_IMAGE_CUBE
      Returned by the type parameter of GetActiveUniform.
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    • GL_INT_IMAGE_BUFFER

      public static final int GL_INT_IMAGE_BUFFER
      Returned by the type parameter of GetActiveUniform.
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    • GL_INT_IMAGE_1D_ARRAY

      public static final int GL_INT_IMAGE_1D_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_INT_IMAGE_2D_ARRAY

      public static final int GL_INT_IMAGE_2D_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_INT_IMAGE_CUBE_MAP_ARRAY

      public static final int GL_INT_IMAGE_CUBE_MAP_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_INT_IMAGE_2D_MULTISAMPLE

      public static final int GL_INT_IMAGE_2D_MULTISAMPLE
      Returned by the type parameter of GetActiveUniform.
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    • GL_INT_IMAGE_2D_MULTISAMPLE_ARRAY

      public static final int GL_INT_IMAGE_2D_MULTISAMPLE_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_UNSIGNED_INT_IMAGE_1D

      public static final int GL_UNSIGNED_INT_IMAGE_1D
      Returned by the type parameter of GetActiveUniform.
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    • GL_UNSIGNED_INT_IMAGE_2D

      public static final int GL_UNSIGNED_INT_IMAGE_2D
      Returned by the type parameter of GetActiveUniform.
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    • GL_UNSIGNED_INT_IMAGE_3D

      public static final int GL_UNSIGNED_INT_IMAGE_3D
      Returned by the type parameter of GetActiveUniform.
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    • GL_UNSIGNED_INT_IMAGE_2D_RECT

      public static final int GL_UNSIGNED_INT_IMAGE_2D_RECT
      Returned by the type parameter of GetActiveUniform.
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    • GL_UNSIGNED_INT_IMAGE_CUBE

      public static final int GL_UNSIGNED_INT_IMAGE_CUBE
      Returned by the type parameter of GetActiveUniform.
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    • GL_UNSIGNED_INT_IMAGE_BUFFER

      public static final int GL_UNSIGNED_INT_IMAGE_BUFFER
      Returned by the type parameter of GetActiveUniform.
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    • GL_UNSIGNED_INT_IMAGE_1D_ARRAY

      public static final int GL_UNSIGNED_INT_IMAGE_1D_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_UNSIGNED_INT_IMAGE_2D_ARRAY

      public static final int GL_UNSIGNED_INT_IMAGE_2D_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_UNSIGNED_INT_IMAGE_CUBE_MAP_ARRAY

      public static final int GL_UNSIGNED_INT_IMAGE_CUBE_MAP_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_UNSIGNED_INT_IMAGE_2D_MULTISAMPLE

      public static final int GL_UNSIGNED_INT_IMAGE_2D_MULTISAMPLE
      Returned by the type parameter of GetActiveUniform.
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    • GL_UNSIGNED_INT_IMAGE_2D_MULTISAMPLE_ARRAY

      public static final int GL_UNSIGNED_INT_IMAGE_2D_MULTISAMPLE_ARRAY
      Returned by the type parameter of GetActiveUniform.
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    • GL_IMAGE_FORMAT_COMPATIBILITY_TYPE

      public static final int GL_IMAGE_FORMAT_COMPATIBILITY_TYPE
      Accepted by the value parameter of GetTexParameteriv, GetTexParameterfv, GetTexParameterIiv, and GetTexParameterIuiv.
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    • GL_IMAGE_FORMAT_COMPATIBILITY_BY_SIZE

      public static final int GL_IMAGE_FORMAT_COMPATIBILITY_BY_SIZE
      Returned in the data parameter of GetTexParameteriv, GetTexParameterfv, GetTexParameterIiv, and GetTexParameterIuiv when value is IMAGE_FORMAT_COMPATIBILITY_TYPE.
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    • GL_IMAGE_FORMAT_COMPATIBILITY_BY_CLASS

      public static final int GL_IMAGE_FORMAT_COMPATIBILITY_BY_CLASS
      Returned in the data parameter of GetTexParameteriv, GetTexParameterfv, GetTexParameterIiv, and GetTexParameterIuiv when value is IMAGE_FORMAT_COMPATIBILITY_TYPE.
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  • Method Details