org.lwjgl.opengles.EXTTessellationShader Maven / Gradle / Ivy
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/*
* Copyright LWJGL. All rights reserved.
* License terms: https://www.lwjgl.org/license
* MACHINE GENERATED FILE, DO NOT EDIT
*/
package org.lwjgl.opengles;
import static org.lwjgl.system.Checks.*;
/**
* Native bindings to the EXT_tessellation_shader extension.
*
* This extension introduces new tessellation stages and two new shader types to the OpenGL ES primitive processing pipeline. These pipeline stages
* operate on a new basic primitive type, called a patch. A patch consists of a fixed-size collection of vertices, each with per-vertex attributes, plus a
* number of associated per-patch attributes. Tessellation control shaders transform an input patch specified by the application, computing per-vertex and
* per-patch attributes for a new output patch. A fixed-function tessellation primitive generator subdivides the patch, and tessellation evaluation
* shaders are used to compute the position and attributes of each vertex produced by the tessellator.
*
* When tessellation is active, it begins by running the optional tessellation control shader. This shader consumes an input patch and produces a new
* fixed-size output patch. The output patch consists of an array of vertices, and a set of per-patch attributes. The per-patch attributes include
* tessellation levels that control how finely the patch will be tessellated. For each patch processed, multiple tessellation control shader invocations
* are performed -- one per output patch vertex. Each tessellation control shader invocation writes all the attributes of its corresponding output patch
* vertex. A tessellation control shader may also read the per-vertex outputs of other tessellation control shader invocations, as well as read and write
* shared per-patch outputs. The tessellation control shader invocations for a single patch effectively run as a group. A built-in barrier() function is
* provided to allow synchronization points where no shader invocation will continue until all shader invocations have reached the barrier.
*
* The tessellation primitive generator then decomposes a patch into a new set of primitives using the tessellation levels to determine how finely
* tessellated the output should be. The primitive generator begins with either a triangle or a quad, and splits each outer edge of the primitive into a
* number of segments approximately equal to the corresponding element of the outer tessellation level array. The interior of the primitive is tessellated
* according to elements of the inner tessellation level array. The primitive generator has three modes: "triangles" and "quads" split a triangular or
* quad-shaped patch into a set of triangles that cover the original patch; "isolines" splits a quad-shaped patch into a set of line strips running across
* the patch horizontally. Each vertex generated by the tessellation primitive generator is assigned a (u,v) or (u,v,w) coordinate indicating its relative
* location in the subdivided triangle or quad.
*
* For each vertex produced by the tessellation primitive generator, the tessellation evaluation shader is run to compute its position and other
* attributes of the vertex, using its (u,v) or (u,v,w) coordinate. When computing final vertex attributes, the tessellation evaluation shader can also
* read the attributes of any of the vertices of the patch written by the tessellation control shader. Tessellation evaluation shader invocations are
* completely independent, although all invocations for a single patch share the same collection of input vertices and per-patch attributes.
*
* The tessellator operates on vertices after they have been transformed by a vertex shader. The primitives generated by the tessellator are passed
* further down the OpenGL ES pipeline, where they can be used as inputs to geometry shaders, transform feedback, and the rasterizer.
*
* The tessellation control and evaluation shaders are both optional. If neither shader type is present, the tessellation stage has no effect. However, if
* either a tessellation control or a tessellation evaluation shader is present, the other must also be present.
*
* Not all tessellation shader implementations have the ability to write the point size from a tessellation shader. Thus a second extension string and
* shading language enable are provided for implementations which do support tessellation shader point size.
*
* This extension relies on the EXT_shader_io_blocks extension to provide the required functionality for declaring input and output blocks and interfacing
* between shaders.
*
* This extension relies on the EXT_gpu_shader5 extension to provide the 'precise' and 'fma' functionality which are necessary to ensure crack-free
* tessellation.
*
* Requires {@link GLES31 GLES 3.1}.
*/
public class EXTTessellationShader {
/** Accepted by the {@code mode} parameter of DrawArrays, DrawElements, and other commands which draw primitives. */
public static final int GL_PATCHES_EXT = 0xE;
/** Accepted by the {@code pname} parameter of PatchParameteriEXT, GetBooleanv, GetFloatv, GetIntegerv, and GetInteger64v. */
public static final int GL_PATCH_VERTICES_EXT = 0x8E72;
/** Accepted by the {@code pname} parameter of GetProgramiv. */
public static final int
GL_TESS_CONTROL_OUTPUT_VERTICES_EXT = 0x8E75,
GL_TESS_GEN_MODE_EXT = 0x8E76,
GL_TESS_GEN_SPACING_EXT = 0x8E77,
GL_TESS_GEN_VERTEX_ORDER_EXT = 0x8E78,
GL_TESS_GEN_POINT_MODE_EXT = 0x8E79;
/** Returned by GetProgramiv when {@code pname} is TESS_GEN_MODE_EXT. */
public static final int
GL_ISOLINES_EXT = 0x8E7A,
GL_QUADS_EXT = 0x7;
/** Returned by GetProgramiv when {@code pname} is TESS_GEN_SPACING_EXT. */
public static final int
GL_FRACTIONAL_ODD_EXT = 0x8E7B,
GL_FRACTIONAL_EVEN_EXT = 0x8E7C;
/** Accepted by the {@code pname} parameter of GetBooleanv, GetFloatv, GetIntegerv, and GetInteger64v. */
public static final int
GL_MAX_PATCH_VERTICES_EXT = 0x8E7D,
GL_MAX_TESS_GEN_LEVEL_EXT = 0x8E7E,
GL_MAX_TESS_CONTROL_UNIFORM_COMPONENTS_EXT = 0x8E7F,
GL_MAX_TESS_EVALUATION_UNIFORM_COMPONENTS_EXT = 0x8E80,
GL_MAX_TESS_CONTROL_TEXTURE_IMAGE_UNITS_EXT = 0x8E81,
GL_MAX_TESS_EVALUATION_TEXTURE_IMAGE_UNITS_EXT = 0x8E82,
GL_MAX_TESS_CONTROL_OUTPUT_COMPONENTS_EXT = 0x8E83,
GL_MAX_TESS_PATCH_COMPONENTS_EXT = 0x8E84,
GL_MAX_TESS_CONTROL_TOTAL_OUTPUT_COMPONENTS_EXT = 0x8E85,
GL_MAX_TESS_EVALUATION_OUTPUT_COMPONENTS_EXT = 0x8E86,
GL_MAX_TESS_CONTROL_UNIFORM_BLOCKS_EXT = 0x8E89,
GL_MAX_TESS_EVALUATION_UNIFORM_BLOCKS_EXT = 0x8E8A,
GL_MAX_TESS_CONTROL_INPUT_COMPONENTS_EXT = 0x886C,
GL_MAX_TESS_EVALUATION_INPUT_COMPONENTS_EXT = 0x886D,
GL_MAX_COMBINED_TESS_CONTROL_UNIFORM_COMPONENTS_EXT = 0x8E1E,
GL_MAX_COMBINED_TESS_EVALUATION_UNIFORM_COMPONENTS_EXT = 0x8E1F,
GL_MAX_TESS_CONTROL_ATOMIC_COUNTER_BUFFERS_EXT = 0x92CD,
GL_MAX_TESS_EVALUATION_ATOMIC_COUNTER_BUFFERS_EXT = 0x92CE,
GL_MAX_TESS_CONTROL_ATOMIC_COUNTERS_EXT = 0x92D3,
GL_MAX_TESS_EVALUATION_ATOMIC_COUNTERS_EXT = 0x92D4,
GL_MAX_TESS_CONTROL_IMAGE_UNIFORMS_EXT = 0x90CB,
GL_MAX_TESS_EVALUATION_IMAGE_UNIFORMS_EXT = 0x90CC,
GL_MAX_TESS_CONTROL_SHADER_STORAGE_BLOCKS_EXT = 0x90D8,
GL_MAX_TESS_EVALUATION_SHADER_STORAGE_BLOCKS_EXT = 0x90D9,
GL_PRIMITIVE_RESTART_FOR_PATCHES_SUPPORTED = 0x8221;
/** Accepted by the {@code props} parameter of GetProgramResourceiv. */
public static final int
GL_IS_PER_PATCH_EXT = 0x92E7,
GL_REFERENCED_BY_TESS_CONTROL_SHADER_EXT = 0x9307,
GL_REFERENCED_BY_TESS_EVALUATION_SHADER_EXT = 0x9308;
/**
* Accepted by the {@code type} parameter of CreateShader, by the {@code pname} parameter of GetProgramPipelineiv, and returned by the {@code params}
* parameter of GetShaderiv.
*/
public static final int
GL_TESS_EVALUATION_SHADER_EXT = 0x8E87,
GL_TESS_CONTROL_SHADER_EXT = 0x8E88;
/** Accepted by the {@code stages} parameter of UseProgramStages. */
public static final int
GL_TESS_CONTROL_SHADER_BIT_EXT = 0x8,
GL_TESS_EVALUATION_SHADER_BIT_EXT = 0x10;
static { GLES.initialize(); }
protected EXTTessellationShader() {
throw new UnsupportedOperationException();
}
static boolean isAvailable(GLESCapabilities caps) {
return checkFunctions(
caps.glPatchParameteriEXT
);
}
// --- [ glPatchParameteriEXT ] ---
public static native void nglPatchParameteriEXT(int pname, int value);
public static void glPatchParameteriEXT(int pname, int value) {
nglPatchParameteriEXT(pname, value);
}
}