Example usage for org.lwjgl.opengl ARBComputeVariableGroupSize glDispatchComputeGroupSizeARB

Introduction

In this page you can find the example usage for org.lwjgl.opengl ARBComputeVariableGroupSize glDispatchComputeGroupSizeARB.

Prototype

public static native void glDispatchComputeGroupSizeARB(@NativeType("GLuint") int num_groups_x,
        @NativeType("GLuint") int num_groups_y, @NativeType("GLuint") int num_groups_z,
        @NativeType("GLuint") int group_size_x, @NativeType("GLuint") int group_size_y,
        @NativeType("GLuint") int group_size_z);

Source Link

Document

Launches one or more compute work groups, with arbitrary dimensions.

Usage

From source file:org.lwjgl.demo.opengl.raytracing.PhotonMappingBindlessDemo.java

License:Open Source License

/**
 * Trace some rays from the light.//from  w ww . java 2  s.  c om
 */
private void trace() {
    glUseProgram(photonTraceProgram);

    long thisTime = System.nanoTime();
    float elapsedSeconds = (thisTime - firstTime) / 1E9f;
    glUniform1f(timeUniform, elapsedSeconds);

    /* Bind the SSBO containing our boxes */
    glBindBufferBase(GL_SHADER_STORAGE_BUFFER, boxesSsboBinding, ssbo);
    /* Bind the UBO containing the bindless handles of our images */
    glBindBufferBase(GL_UNIFORM_BUFFER, imagesUboBinding, imageHandlesUbo);

    /* Compute appropriate invocation dimension. */
    int invocationsPerDimension = photonsPerFrame;
    int worksizeX = mathRoundPoT(invocationsPerDimension);
    int worksizeY = mathRoundPoT(invocationsPerDimension);

    /* Invoke the compute shader. */
    if (variableGroupSize) {
        ARBComputeVariableGroupSize.glDispatchComputeGroupSizeARB(worksizeX / workGroupSizeX,
                worksizeY / workGroupSizeY, 1, workGroupSizeX, workGroupSizeY, 1);
    } else {
        glDispatchCompute(worksizeX / workGroupSizeX, worksizeY / workGroupSizeY, 1);
    }
    /*
     * Synchronize all writes that the shader did on the photonMap cube map
     * array image before we later let OpenGL source texels from it when
     * rasterizing the scene and sampling the cube maps in the fragment
     * shader.
     */
    glMemoryBarrier(GL_SHADER_IMAGE_ACCESS_BARRIER_BIT);

    /* Reset bindings. */
    glBindBufferBase(GL_SHADER_STORAGE_BUFFER, boxesSsboBinding, 0);
    glBindBufferBase(GL_UNIFORM_BUFFER, imagesUboBinding, 0);
    glUseProgram(0);
}

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