Example usage for org.lwjgl.opengl ARBClearTexture glClearTexImage

Introduction

In this page you can find the example usage for org.lwjgl.opengl ARBClearTexture glClearTexImage.

Prototype

public static void glClearTexImage(@NativeType("GLuint") int texture, @NativeType("GLint") int level,
        @NativeType("GLenum") int format, @NativeType("GLenum") int type,
        @Nullable @NativeType("void const *") double[] data) 

Source Link

Document

Array version of: #glClearTexImage ClearTexImage

Usage

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

License:Open Source License

/**
 * Clear the photon map textures./*from  w  w  w  .j  ava  2  s.c o m*/
 */
private void clearPhotonMapTextures() {
    /*
     * Clear the first level of the texture with black without allocating
     * host memory.
     */
    if (caps.GL_ARB_clear_texture) {
        /*
         * If ARB_clear_texture is available, we can directly clear the
         * image of the texture. A version where you can clear the images of
         * multiple successive textures would be handy here!
         */
        for (int i = 0; i < photonMapTextures.length; i++) {
            TextureInfo info = photonMapTextures[i];
            ARBClearTexture.glClearTexImage(info.openGlHandle, 0, GL_RG, GL_HALF_FLOAT, clearTexBuffer);
        }
    } else {
        /*
         * If not, we create a temporary buffer object and use pixel unpack
         * to move GPU memory from that buffer to the texture image.
         */
        for (int i = 0; i < photonMapTextures.length; i++) {
            TextureInfo info = photonMapTextures[i];
            int texBuffer = glGenBuffers();
            glBindBuffer(GL_PIXEL_UNPACK_BUFFER, texBuffer);
            int size = 2 * 2 * info.textureWidth * info.textureHeight;
            glBufferData(GL_PIXEL_UNPACK_BUFFER, size, GL_STATIC_DRAW);
            glClearBufferSubData(GL_PIXEL_UNPACK_BUFFER, GL_RG16F, 0, size, GL_RG, GL_HALF_FLOAT,
                    (ByteBuffer) null);
            glBindTexture(GL_TEXTURE_CUBE_MAP, info.openGlHandle);
            for (int f = 0; f < 6; f++) {
                glTexSubImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + f, 0, 0, 0, info.textureWidth,
                        info.textureHeight, GL_RG, GL_HALF_FLOAT, 0L);
            }
            glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
            glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
            glDeleteBuffers(texBuffer);
        }
    }
}

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

License:Open Source License

/**
 * Clear the photon map texture.//from   w  ww . ja  va2s .c om
 */
private void clearPhotonMapTexture() {
    /*
     * Clear the first level of the texture with black without allocating
     * host memory.
     */
    if (caps.GL_ARB_clear_texture) {
        /*
         * If ARB_clear_texture is available, we can directly clear the
         * image of the texture.
         */
        ARBClearTexture.glClearTexImage(photonMapTexture, 0, GL_RG, GL_HALF_FLOAT, clearTexBuffer);
    } else {
        /*
         * If not, we create a temporary buffer object and use pixel unpack
         * to move GPU memory from that buffer to the texture image.
         */
        int texBuffer = glGenBuffers();
        glBindBuffer(GL_PIXEL_UNPACK_BUFFER, texBuffer);
        int size = 2 * 2 * photonMapSize * photonMapSize * 6 * boxes.length / 2;
        glBufferData(GL_PIXEL_UNPACK_BUFFER, size, GL_STATIC_DRAW);
        glClearBufferSubData(GL_PIXEL_UNPACK_BUFFER, GL_RG16F, 0, size, GL_RG, GL_HALF_FLOAT,
                (ByteBuffer) null);
        glBindTexture(GL_TEXTURE_CUBE_MAP_ARRAY, photonMapTexture);
        glTexSubImage3D(GL_TEXTURE_CUBE_MAP_ARRAY, 0, 0, 0, 0, photonMapSize, photonMapSize,
                6 * boxes.length / 2, GL_RG, GL_HALF_FLOAT, 0L);
        glBindTexture(GL_TEXTURE_CUBE_MAP_ARRAY, 0);
        glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
        glDeleteBuffers(texBuffer);
    }
}

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