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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_raster_multisample extension.
 * 
 * This extension allows rendering to a non-multisample color buffer while rasterizing with more than one sample. The result of rasterization (coverage)
 * is available in the {@code gl_SampleMaskIn[]} fragment shader input, multisample rasterization is enabled for all primitives, and several per- fragment
 * operations operate at the raster sample rate.
 * 
 * When using the functionality provided by this extension, depth, stencil, and depth bounds tests must be disabled, and a multisample draw framebuffer
 * must not be used.
 * 
 * A fragment's "coverage", or "effective raster samples" is considered to have "N bits" (as opposed to "one bit" corresponding to the single color
 * sample) through the fragment shader, in the sample mask output, through the multisample fragment operations and occlusion query, until the coverage is
 * finally "reduced" to a single bit in a new "Coverage Reduction" stage that occurs before blending.
 */
public class EXTRasterMultisample {

    /** Accepted by the {@code cap} parameter of Enable, Disable, IsEnabled. */
    public static final int GL_RASTER_MULTISAMPLE_EXT = 0x9327;

    /** Accepted by the {@code pname} parameter of GetBooleanv, GetDoublev, GetIntegerv, and GetFloatv. */
    public static final int
        GL_RASTER_SAMPLES_EXT                    = 0x9328,
        GL_MAX_RASTER_SAMPLES_EXT                = 0x9329,
        GL_RASTER_FIXED_SAMPLE_LOCATIONS_EXT     = 0x932A,
        GL_MULTISAMPLE_RASTERIZATION_ALLOWED_EXT = 0x932B,
        GL_EFFECTIVE_RASTER_SAMPLES_EXT          = 0x932C;

    static { GL.initialize(); }

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

    static boolean isAvailable(GLCapabilities caps) {
        return checkFunctions(
            caps.glRasterSamplesEXT
        );
    }

    // --- [ glRasterSamplesEXT ] ---

    /**
     * Selects the number of samples to be used for rasterization. {@code samples} represents a request for a desired minimum number of samples. Since
     * different implementations may support different sample counts, the actual sample pattern used is implementation-dependent. However, the resulting value
     * for {@link #GL_RASTER_SAMPLES_EXT RASTER_SAMPLES_EXT} is guaranteed to be greater than or equal to {@code samples} and no more than the next larger sample count supported by the
     * implementation. If {@code fixedsamplelocations} is {@link GL11#GL_TRUE TRUE}, identical sample locations will be used for all pixels. The sample locations chosen are a
     * function of only the parameters to RasterSamplesEXT and not of any other state.
     * 
     * If {@link #GL_RASTER_MULTISAMPLE_EXT RASTER_MULTISAMPLE_EXT} is enabled, then the sample pattern chosen by RasterSamplesEXT will be used instead of sampling at the center of the pixel.
     * The sample locations can be queried with {@link GL32#glGetMultisamplefv GetMultisamplefv} with a {@code pname} of {@link GL32#GL_SAMPLE_POSITION SAMPLE_POSITION}, similar to normal multisample sample
     * locations.
     * 
     * The value {@link #GL_MULTISAMPLE_RASTERIZATION_ALLOWED_EXT MULTISAMPLE_RASTERIZATION_ALLOWED_EXT} is {@link GL11#GL_TRUE TRUE} if {@link GL13#GL_SAMPLE_BUFFERS SAMPLE_BUFFERS} is one or if {@link #GL_RASTER_MULTISAMPLE_EXT RASTER_MULTISAMPLE_EXT} is enabled. The value
     * {@link #GL_EFFECTIVE_RASTER_SAMPLES_EXT EFFECTIVE_RASTER_SAMPLES_EXT} is equal to {@link #GL_RASTER_SAMPLES_EXT RASTER_SAMPLES_EXT} if {@link #GL_RASTER_MULTISAMPLE_EXT RASTER_MULTISAMPLE_EXT} is enabled, otherwise is equal to {@link GL13#GL_SAMPLES SAMPLES}.
     * 
     * Explicit multisample rasterization can not be used in conjunction with depth, stencil, or depth bounds tests, multisample framebuffers, or if
     * {@link #GL_RASTER_SAMPLES_EXT RASTER_SAMPLES_EXT} is zero. If {@link #GL_RASTER_MULTISAMPLE_EXT RASTER_MULTISAMPLE_EXT} is enabled, the error {@link GL11#GL_INVALID_OPERATION INVALID_OPERATION} will be generated by Draw commands if
     * 
     * 
     * the value of {@link #GL_RASTER_SAMPLES_EXT RASTER_SAMPLES_EXT} is zero
     * the depth, stencil, or depth bounds test is enabled
     * a multisample draw framebuffer is bound ({@link GL13#GL_SAMPLE_BUFFERS SAMPLE_BUFFERS} is one)
     * 
     * 
     * Errors
     * 
     * An {@link GL11#GL_INVALID_VALUE INVALID_VALUE} error is generated if {@code samples} is greater than the value of {@link #GL_MAX_RASTER_SAMPLES_EXT MAX_RASTER_SAMPLES_EXT} (the implementation-dependent maximum
     * number of samples).
     *
     * @param samples              the number of samples to be used for rasterization
     * @param fixedsamplelocations if {@link GL11#GL_TRUE TRUE}, identical sample locations will be used for all pixels
     */
    public static native void glRasterSamplesEXT(@NativeType("GLuint") int samples, @NativeType("GLboolean") boolean fixedsamplelocations);

}