Package org.lwjgl.opengles

Class OESGeometryShader

java.lang.Object
org.lwjgl.opengles.OESGeometryShader
public class OESGeometryShader extends Object
Native bindings to the OES_geometry_shader extension.

OES_geometry_shader defines a new shader type available to be run on the GPU, called a geometry shader. Geometry shaders are run after vertices are transformed, but prior to color clamping, flatshading and clipping.

A geometry shader begins with a single primitive (point, line, triangle). It can read the attributes of any of the vertices in the primitive and use them to generate new primitives. A geometry shader has a fixed output primitive type (point, line strip, or triangle strip) and emits vertices to define a new primitive. A geometry shader can emit multiple disconnected primitives. The primitives emitted by the geometry shader are clipped and then processed like an equivalent primitive specified by the application.

Furthermore, OES_geometry_shader provides four additional primitive types: lines with adjacency, line strips with adjacency, separate triangles with adjacency, and triangle strips with adjacency. Some of the vertices specified in these new primitive types are not part of the ordinary primitives, instead they represent neighboring vertices that are adjacent to the two line segment end points (lines/strips) or the three triangle edges (triangles/tstrips). These vertices can be accessed by geometry shaders and used to match up the vertices emitted by the geometry shader with those of neighboring primitives.

Since geometry shaders expect a specific input primitive type, an error will occur if the application presents primitives of a different type. For example, if a geometry shader expects points, an error will occur at drawing time if a primitive mode of TRIANGLES is specified.

This extension also adds the notion of layered framebuffer attachments and framebuffers that can be used in conjunction with geometry shaders to allow programs to direct primitives to a face of a cube map or layer of a three-dimensional texture or two-dimensional array texture. The layer used for rendering can be selected by the geometry shader at run time. The framebuffer layer count present in GL 4.x and removed from ES 3.1 is restored.

Not all geometry shader implementations have the ability to write the point size from a geometry shader. Thus a second extension string and shading language enable are provided for implementations which do support geometry shader point size.

This extension relies on the OES_shader_io_blocks extension to provide the required functionality for declaring input and output blocks and interfacing between shaders.

Requires GLES 3.1 and OES_shader_io_blocks or EXT_shader_io_blocks.

  • Field Details

    • GL_GEOMETRY_SHADER_OES

      public static final int GL_GEOMETRY_SHADER_OES
      Accepted by the type parameter of CreateShader and CreateShaderProgramv, by the pname parameter of GetProgramPipelineiv and returned in the params parameter of GetShaderiv when pname is SHADER_TYPE.
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    • GL_GEOMETRY_SHADER_BIT_OES

      public static final int GL_GEOMETRY_SHADER_BIT_OES
      Accepted by the stages parameter of UseProgramStages.
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    • GL_GEOMETRY_LINKED_VERTICES_OUT_OES

      public static final int GL_GEOMETRY_LINKED_VERTICES_OUT_OES
      Accepted by the pname parameter of GetProgramiv.
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    • GL_GEOMETRY_LINKED_INPUT_TYPE_OES

      public static final int GL_GEOMETRY_LINKED_INPUT_TYPE_OES
      Accepted by the pname parameter of GetProgramiv.
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    • GL_GEOMETRY_LINKED_OUTPUT_TYPE_OES

      public static final int GL_GEOMETRY_LINKED_OUTPUT_TYPE_OES
      Accepted by the pname parameter of GetProgramiv.
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    • GL_GEOMETRY_SHADER_INVOCATIONS_OES

      public static final int GL_GEOMETRY_SHADER_INVOCATIONS_OES
      Accepted by the pname parameter of GetProgramiv.
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    • GL_LAYER_PROVOKING_VERTEX_OES

      public static final int GL_LAYER_PROVOKING_VERTEX_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_UNIFORM_COMPONENTS_OES

      public static final int GL_MAX_GEOMETRY_UNIFORM_COMPONENTS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_UNIFORM_BLOCKS_OES

      public static final int GL_MAX_GEOMETRY_UNIFORM_BLOCKS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_COMBINED_GEOMETRY_UNIFORM_COMPONENTS_OES

      public static final int GL_MAX_COMBINED_GEOMETRY_UNIFORM_COMPONENTS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_INPUT_COMPONENTS_OES

      public static final int GL_MAX_GEOMETRY_INPUT_COMPONENTS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_OUTPUT_COMPONENTS_OES

      public static final int GL_MAX_GEOMETRY_OUTPUT_COMPONENTS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_OUTPUT_VERTICES_OES

      public static final int GL_MAX_GEOMETRY_OUTPUT_VERTICES_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS_OES

      public static final int GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_SHADER_INVOCATIONS_OES

      public static final int GL_MAX_GEOMETRY_SHADER_INVOCATIONS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS_OES

      public static final int GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_ATOMIC_COUNTER_BUFFERS_OES

      public static final int GL_MAX_GEOMETRY_ATOMIC_COUNTER_BUFFERS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_ATOMIC_COUNTERS_OES

      public static final int GL_MAX_GEOMETRY_ATOMIC_COUNTERS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_IMAGE_UNIFORMS_OES

      public static final int GL_MAX_GEOMETRY_IMAGE_UNIFORMS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_MAX_GEOMETRY_SHADER_STORAGE_BLOCKS_OES

      public static final int GL_MAX_GEOMETRY_SHADER_STORAGE_BLOCKS_OES
      Accepted by the pname parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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    • GL_FIRST_VERTEX_CONVENTION_OES

      public static final int GL_FIRST_VERTEX_CONVENTION_OES
      Returned in the data parameter from a Get query with a pname of LAYER_PROVOKING_VERTEX_OES.
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    • GL_LAST_VERTEX_CONVENTION_OES

      public static final int GL_LAST_VERTEX_CONVENTION_OES
      Returned in the data parameter from a Get query with a pname of LAYER_PROVOKING_VERTEX_OES.
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    • GL_UNDEFINED_VERTEX_OES

      public static final int GL_UNDEFINED_VERTEX_OES
      Returned in the data parameter from a Get query with a pname of LAYER_PROVOKING_VERTEX_OES.
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    • GL_PRIMITIVES_GENERATED_OES

      public static final int GL_PRIMITIVES_GENERATED_OES
      Accepted by the target parameter of BeginQuery, EndQuery, GetQueryiv, and GetQueryObjectuiv.
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    • GL_LINES_ADJACENCY_OES

      public static final int GL_LINES_ADJACENCY_OES
      Accepted by the mode parameter of DrawArrays, DrawElements, and other commands which draw primitives.
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    • GL_LINE_STRIP_ADJACENCY_OES

      public static final int GL_LINE_STRIP_ADJACENCY_OES
      Accepted by the mode parameter of DrawArrays, DrawElements, and other commands which draw primitives.
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    • GL_TRIANGLES_ADJACENCY_OES

      public static final int GL_TRIANGLES_ADJACENCY_OES
      Accepted by the mode parameter of DrawArrays, DrawElements, and other commands which draw primitives.
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    • GL_TRIANGLE_STRIP_ADJACENCY_OES

      public static final int GL_TRIANGLE_STRIP_ADJACENCY_OES
      Accepted by the mode parameter of DrawArrays, DrawElements, and other commands which draw primitives.
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    • GL_FRAMEBUFFER_DEFAULT_LAYERS_OES

      public static final int GL_FRAMEBUFFER_DEFAULT_LAYERS_OES
      Accepted by the pname parameter of FramebufferParameteri, and GetFramebufferParameteriv.
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    • GL_MAX_FRAMEBUFFER_LAYERS_OES

      public static final int GL_MAX_FRAMEBUFFER_LAYERS_OES
      Accepted by the pname parameter of GetIntegerv, GetBooleanv, GetInteger64v, and GetFloatv.
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    • GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS_OES

      public static final int GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS_OES
      Returned by CheckFramebufferStatus.
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    • GL_FRAMEBUFFER_ATTACHMENT_LAYERED_OES

      public static final int GL_FRAMEBUFFER_ATTACHMENT_LAYERED_OES
      Accepted by the pname parameter of GetFramebufferAttachmentParameteriv.
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    • GL_REFERENCED_BY_GEOMETRY_SHADER_OES

      public static final int GL_REFERENCED_BY_GEOMETRY_SHADER_OES
      Accepted by the props parameter of GetProgramResourceiv.
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  • Method Details

    • glFramebufferTextureOES

      public static void glFramebufferTextureOES(int target, int attachment, int texture, int level)