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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.opengl;

import org.lwjgl.system.*;

import static org.lwjgl.system.Checks.*;

/**
 * Native bindings to the EXT_geometry_shader4 extension.
 * 
 * EXT_geometry_shader4 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, flat shading 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 OpenGL primitive specified by the application.
 * 
 * Furthermore, EXT_geometry_shader4 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 Begin() time, if a primitive mode of TRIANGLES is specified.
 */
public class EXTGeometryShader4 {

    /** Accepted by the {@code type} parameter of CreateShader and returned by the {@code params} parameter of GetShaderiv. */
    public static final int GL_GEOMETRY_SHADER_EXT = 0x8DD9;

    /** Accepted by the {@code pname} parameter of ProgramParameteriEXT and GetProgramiv. */
    public static final int
        GL_GEOMETRY_VERTICES_OUT_EXT = 0x8DDA,
        GL_GEOMETRY_INPUT_TYPE_EXT   = 0x8DDB,
        GL_GEOMETRY_OUTPUT_TYPE_EXT  = 0x8DDC;

    /** Accepted by the {@code pname} parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetDoublev. */
    public static final int
        GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS_EXT     = 0x8C29,
        GL_MAX_GEOMETRY_VARYING_COMPONENTS_EXT      = 0x8DDD,
        GL_MAX_VERTEX_VARYING_COMPONENTS_EXT        = 0x8DDE,
        GL_MAX_VARYING_COMPONENTS_EXT               = 0x8B4B,
        GL_MAX_GEOMETRY_UNIFORM_COMPONENTS_EXT      = 0x8DDF,
        GL_MAX_GEOMETRY_OUTPUT_VERTICES_EXT         = 0x8DE0,
        GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS_EXT = 0x8DE1;

    /** Accepted by the {@code mode} parameter of Begin, DrawArrays, MultiDrawArrays, DrawElements, MultiDrawElements, and DrawRangeElements. */
    public static final int
        GL_LINES_ADJACENCY_EXT          = 0xA,
        GL_LINE_STRIP_ADJACENCY_EXT     = 0xB,
        GL_TRIANGLES_ADJACENCY_EXT      = 0xC,
        GL_TRIANGLE_STRIP_ADJACENCY_EXT = 0xD;

    /** Returned by CheckFramebufferStatusEXT. */
    public static final int
        GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS_EXT = 0x8DA8,
        GL_FRAMEBUFFER_INCOMPLETE_LAYER_COUNT_EXT   = 0x8DA9;

    /** Accepted by the {@code pname} parameter of GetFramebufferAttachment- ParameterivEXT. */
    public static final int
        GL_FRAMEBUFFER_ATTACHMENT_LAYERED_EXT       = 0x8DA7,
        GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER_EXT = 0x8CD4;

    /**
     * Accepted by the {@code cap} parameter of Enable, Disable, and IsEnabled, and by the {@code pname} parameter of GetIntegerv, GetFloatv, GetDoublev, and
     * GetBooleanv.
     */
    public static final int GL_PROGRAM_POINT_SIZE_EXT = 0x8642;

    static { GL.initialize(); }

    protected EXTGeometryShader4() {
        throw new UnsupportedOperationException();
    }

    static boolean isAvailable(GLCapabilities caps) {
        return checkFunctions(
            caps.glProgramParameteriEXT, caps.glFramebufferTextureEXT, caps.glFramebufferTextureLayerEXT, caps.glFramebufferTextureFaceEXT
        );
    }

    // --- [ glProgramParameteriEXT ] ---

    public static native void glProgramParameteriEXT(@NativeType("GLuint") int program, @NativeType("GLenum") int pname, @NativeType("GLint") int value);

    // --- [ glFramebufferTextureEXT ] ---

    public static native void glFramebufferTextureEXT(@NativeType("GLenum") int target, @NativeType("GLenum") int attachment, @NativeType("GLuint") int texture, @NativeType("GLint") int level);

    // --- [ glFramebufferTextureLayerEXT ] ---

    public static native void glFramebufferTextureLayerEXT(@NativeType("GLenum") int target, @NativeType("GLenum") int attachment, @NativeType("GLuint") int texture, @NativeType("GLint") int level, @NativeType("GLint") int layer);

    // --- [ glFramebufferTextureFaceEXT ] ---

    public static native void glFramebufferTextureFaceEXT(@NativeType("GLenum") int target, @NativeType("GLenum") int attachment, @NativeType("GLuint") int texture, @NativeType("GLint") int level, @NativeType("GLenum") int face);

}