org.lwjgl.opengles.APPLECopyTextureLevels 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 org.lwjgl.system.*;
import static org.lwjgl.system.Checks.*;
/**
* Native bindings to the APPLE_copy_texture_levels extension.
*
* This extension provides an efficient path for copying a contiguous subset of mipmap levels from one texture to the matching subset of mipmap levels of
* another texture, where matches are determined by the equality of a level's dimensions.
*
* This extension is dependent on the existence of the extension EXT_texture_storage. Immutable textures are used to guarantee that storage is allocated
* up front for the source and destination textures and that the internal formats of those textures are sized the same.
*
* An efficient copy can be achieved by implementations because the internal storage requirements are the same between textures and will remain unchanged
* when moving data. It is expected that in all cases, moving levels from one texture to another is a simple copy operation without any necessary
* conversion. This extension can be used as an alternative to TEXTURE_BASE_LEVEL. In some implementations, changing the value of TEXTURE_BASE_LEVEL can
* incur a costly re-allocation at runtime.
*
* Texture streaming is an expected use case for this extension. For example, a developer may want to stream in a larger base level for a given texture
* from a storage device. To achieve this, a copy of the current mipmap levels are made into a destination whose storage was specified to accommodate the
* source levels and the larger base level. The efficiency of the copy without conversion allows for the smaller mipmap levels to be in place while the
* larger base level is being read from the storage device and uploaded.
*
* Requires {@link GLES20 GLES 2.0} and {@link EXTTextureStorage EXT_texture_storage}.
*/
public class APPLECopyTextureLevels {
static { GLES.initialize(); }
protected APPLECopyTextureLevels() {
throw new UnsupportedOperationException();
}
static boolean isAvailable(GLESCapabilities caps) {
return checkFunctions(
caps.glCopyTextureLevelsAPPLE
);
}
// --- [ glCopyTextureLevelsAPPLE ] ---
public static native void glCopyTextureLevelsAPPLE(@NativeType("GLuint") int destinationTexture, @NativeType("GLuint") int sourceTexture, @NativeType("GLint") int sourceBaseLevel, @NativeType("GLsizei") int sourceLevelCount);
}