Class OESGeometryShader
- java.lang.Object
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- org.lwjgl.opengles.OESGeometryShader
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public class OESGeometryShader extends java.lang.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
andOES_shader_io_blocks
orEXT_shader_io_blocks
.
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Field Summary
Fields Modifier and Type Field Description static int
GL_FIRST_VERTEX_CONVENTION_OES
Returned in thedata
parameter from a Get query with apname
of LAYER_PROVOKING_VERTEX_OES.static int
GL_FRAMEBUFFER_ATTACHMENT_LAYERED_OES
Accepted by thepname
parameter of GetFramebufferAttachmentParameteriv.static int
GL_FRAMEBUFFER_DEFAULT_LAYERS_OES
Accepted by thepname
parameter of FramebufferParameteri, and GetFramebufferParameteriv.static int
GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS_OES
Returned by CheckFramebufferStatus.static int
GL_GEOMETRY_LINKED_INPUT_TYPE_OES
GL_GEOMETRY_LINKED_OUTPUT_TYPE_OES
GL_GEOMETRY_LINKED_VERTICES_OUT_OESAccepted by thepname
parameter of GetProgramiv.static int
GL_GEOMETRY_SHADER_BIT_OES
Accepted by thestages
parameter of UseProgramStages.static int
GL_GEOMETRY_SHADER_INVOCATIONS_OES
Accepted by thepname
parameter of GetProgramiv.static int
GL_GEOMETRY_SHADER_OES
Accepted by thetype
parameter of CreateShader and CreateShaderProgramv, by thepname
parameter of GetProgramPipelineiv and returned in theparams
parameter of GetShaderiv whenpname
is SHADER_TYPE.static int
GL_LAST_VERTEX_CONVENTION_OES
Returned in thedata
parameter from a Get query with apname
of LAYER_PROVOKING_VERTEX_OES.static int
GL_LAYER_PROVOKING_VERTEX_OES
Accepted by thepname
parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.static int
GL_LINE_STRIP_ADJACENCY_OES
GL_LINES_ADJACENCY_OESAccepted by themode
parameter of DrawArrays, DrawElements, and other commands which draw primitives.static int
GL_MAX_COMBINED_GEOMETRY_UNIFORM_COMPONENTS_OES
Accepted by thepname
parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.static int
GL_MAX_FRAMEBUFFER_LAYERS_OES
Accepted by thepname
parameter of GetIntegerv, GetBooleanv, GetInteger64v, and GetFloatv.static int
GL_MAX_GEOMETRY_ATOMIC_COUNTER_BUFFERS_OES
GL_MAX_GEOMETRY_ATOMIC_COUNTERS_OES
GL_MAX_GEOMETRY_IMAGE_UNIFORMS_OES
GL_MAX_GEOMETRY_INPUT_COMPONENTS_OES
GL_MAX_GEOMETRY_OUTPUT_COMPONENTS_OES
GL_MAX_GEOMETRY_OUTPUT_VERTICES_OES
GL_MAX_GEOMETRY_SHADER_INVOCATIONS_OES
GL_MAX_GEOMETRY_SHADER_STORAGE_BLOCKS_OES
GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS_OES
GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS_OES
GL_MAX_GEOMETRY_UNIFORM_BLOCKS_OES
GL_MAX_GEOMETRY_UNIFORM_COMPONENTS_OESAccepted by thepname
parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.static int
GL_PRIMITIVES_GENERATED_OES
Accepted by thetarget
parameter of BeginQuery, EndQuery, GetQueryiv, and GetQueryObjectuiv.static int
GL_REFERENCED_BY_GEOMETRY_SHADER_OES
Accepted by theprops
parameter of GetProgramResourceiv.static int
GL_TRIANGLE_STRIP_ADJACENCY_OES
GL_TRIANGLES_ADJACENCY_OESAccepted by themode
parameter of DrawArrays, DrawElements, and other commands which draw primitives.static int
GL_UNDEFINED_VERTEX_OES
Returned in thedata
parameter from a Get query with apname
of LAYER_PROVOKING_VERTEX_OES.
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static void
glFramebufferTextureOES(int target, int attachment, int texture, int level)
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Field Detail
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GL_GEOMETRY_SHADER_OES
Accepted by thetype
parameter of CreateShader and CreateShaderProgramv, by thepname
parameter of GetProgramPipelineiv and returned in theparams
parameter of GetShaderiv whenpname
is SHADER_TYPE.
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GL_GEOMETRY_SHADER_BIT_OES
Accepted by thestages
parameter of UseProgramStages.
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GL_GEOMETRY_LINKED_VERTICES_OUT_OES, GL_GEOMETRY_LINKED_INPUT_TYPE_OES, GL_GEOMETRY_LINKED_OUTPUT_TYPE_OES, GL_GEOMETRY_SHADER_INVOCATIONS_OES
Accepted by thepname
parameter of GetProgramiv.
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GL_LAYER_PROVOKING_VERTEX_OES, GL_MAX_GEOMETRY_UNIFORM_COMPONENTS_OES, GL_MAX_GEOMETRY_UNIFORM_BLOCKS_OES, GL_MAX_COMBINED_GEOMETRY_UNIFORM_COMPONENTS_OES, GL_MAX_GEOMETRY_INPUT_COMPONENTS_OES, GL_MAX_GEOMETRY_OUTPUT_COMPONENTS_OES, GL_MAX_GEOMETRY_OUTPUT_VERTICES_OES, GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS_OES, GL_MAX_GEOMETRY_SHADER_INVOCATIONS_OES, GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS_OES, GL_MAX_GEOMETRY_ATOMIC_COUNTER_BUFFERS_OES, GL_MAX_GEOMETRY_ATOMIC_COUNTERS_OES, GL_MAX_GEOMETRY_IMAGE_UNIFORMS_OES, GL_MAX_GEOMETRY_SHADER_STORAGE_BLOCKS_OES
Accepted by thepname
parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v.
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GL_FIRST_VERTEX_CONVENTION_OES, GL_LAST_VERTEX_CONVENTION_OES, GL_UNDEFINED_VERTEX_OES
Returned in thedata
parameter from a Get query with apname
of LAYER_PROVOKING_VERTEX_OES.
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GL_PRIMITIVES_GENERATED_OES
Accepted by thetarget
parameter of BeginQuery, EndQuery, GetQueryiv, and GetQueryObjectuiv.
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GL_LINES_ADJACENCY_OES, GL_LINE_STRIP_ADJACENCY_OES, GL_TRIANGLES_ADJACENCY_OES, GL_TRIANGLE_STRIP_ADJACENCY_OES
Accepted by themode
parameter of DrawArrays, DrawElements, and other commands which draw primitives.
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GL_FRAMEBUFFER_DEFAULT_LAYERS_OES
Accepted by thepname
parameter of FramebufferParameteri, and GetFramebufferParameteriv.
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GL_MAX_FRAMEBUFFER_LAYERS_OES
Accepted by thepname
parameter of GetIntegerv, GetBooleanv, GetInteger64v, and GetFloatv.
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GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS_OES
Returned by CheckFramebufferStatus.
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GL_FRAMEBUFFER_ATTACHMENT_LAYERED_OES
Accepted by thepname
parameter of GetFramebufferAttachmentParameteriv.
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GL_REFERENCED_BY_GEOMETRY_SHADER_OES
Accepted by theprops
parameter of GetProgramResourceiv.
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