Package org.lwjgl.opengl

Class INTELMapTexture

java.lang.Object

org.lwjgl.opengl.INTELMapTexture

public class INTELMapTexture
extends java.lang.Object

Native bindings to the INTEL_map_texture extension.

Systems with integrated GPUs can share the same physical memory between CPU and GPU. This feature, if exposed by API, can bring significant performance benefits for graphics applications by reducing the complexity of uploading/accessing texture contents. This extension enables CPU direct access to the GPU memory holding textures.

The problem with texture memory directly exposed to clients is that textures are often 'tiled'. Texels are kept in specific layout to improve locality of reference and thus performance of texturing. This 'tiling' is specific to particular hardware and would be thus difficult to use.

This extension allows to create textures with 'linear' layout which allows for simplified access on user side (potentially sacrificing some performance during texture sampling).

Requires OpenGL 3.0.

Field Summary

Fields

Modifier and Type	Field and Description
static int	GL_LAYOUT_DEFAULT_INTEL GL_LAYOUT_LINEAR_CPU_CACHED_INTEL GL_LAYOUT_LINEAR_INTEL Accepted by the params when pname is set to TEXTURE_MEMORY_LAYOUT_INTEL.
static int	GL_TEXTURE_MEMORY_LAYOUT_INTEL Accepted by the pname parameter of TexParameteri, for target TEXTURE_2D.

Method Summary

Modifier and Type	Method and Description
static java.nio.ByteBuffer	glMapTexture2DINTEL(int texture, int level, int access, int[] stride, int[] layout) Array version of: MapTexture2DINTEL
static java.nio.ByteBuffer	glMapTexture2DINTEL(int texture, int level, int access, int[] stride, int[] layout, java.nio.ByteBuffer old_buffer) Array version of: MapTexture2DINTEL
static java.nio.ByteBuffer	glMapTexture2DINTEL(int texture, int level, int access, int[] stride, int[] layout, long length, java.nio.ByteBuffer old_buffer) Array version of: MapTexture2DINTEL
static java.nio.ByteBuffer	glMapTexture2DINTEL(int texture, int level, int access, java.nio.IntBuffer stride, java.nio.IntBuffer layout) Attempts to return a direct pointer to the graphics storage for 2D texture indicated by the texture parameter.
static java.nio.ByteBuffer	glMapTexture2DINTEL(int texture, int level, int access, java.nio.IntBuffer stride, java.nio.IntBuffer layout, java.nio.ByteBuffer old_buffer) Attempts to return a direct pointer to the graphics storage for 2D texture indicated by the texture parameter.
static java.nio.ByteBuffer	glMapTexture2DINTEL(int texture, int level, int access, java.nio.IntBuffer stride, java.nio.IntBuffer layout, long length, java.nio.ByteBuffer old_buffer) Attempts to return a direct pointer to the graphics storage for 2D texture indicated by the texture parameter.
static void	glSyncTextureINTEL(int texture) Makes sure that changes made by CPU are visible to GPU by flushing texture cache in GPU.
static void	glUnmapTexture2DINTEL(int texture, int level) Releases the pointer obtained previously via MapTexture2DINTEL.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GL_TEXTURE_MEMORY_LAYOUT_INTEL

Accepted by the pname parameter of TexParameteri, for target TEXTURE_2D.

GL_LAYOUT_DEFAULT_INTEL, GL_LAYOUT_LINEAR_INTEL, GL_LAYOUT_LINEAR_CPU_CACHED_INTEL

Accepted by the params when pname is set to TEXTURE_MEMORY_LAYOUT_INTEL.

Method Detail

glSyncTextureINTEL

public static void glSyncTextureINTEL(int texture)

Makes sure that changes made by CPU are visible to GPU by flushing texture cache in GPU. The GL implementation tracks the cache usage and ignores the command if such flush is not needed.

It is worth noting that this extension does not address automatic synchronization between CPU and GPU when both entities operate on the same texture at the same time. This is up to the application to assure such synchronization. Otherwise, the results may not be deterministic (writes from different entities may interleave in a non-deterministic way).

Parameters:

texture - the texture to synchronize

glUnmapTexture2DINTEL

public static void glUnmapTexture2DINTEL(int texture,
                                         int level)

Releases the pointer obtained previously via MapTexture2DINTEL. This means that virtual memory space dedicated to make the texture available via a pointer is released and an application can no longer assume this memory is accessible from CPU. Successful execution of this command has an additional effect as if SyncTextureINTEL was called with texture parameter.

Parameters:

texture - the texture to unmap

level - the mipmap level-of-detail of the texture

glMapTexture2DINTEL

public static java.nio.ByteBuffer glMapTexture2DINTEL(int texture,
                                                      int level,
                                                      int access,
                                                      java.nio.IntBuffer stride,
                                                      java.nio.IntBuffer layout)

public static java.nio.ByteBuffer glMapTexture2DINTEL(int texture,
                                                      int level,
                                                      int access,
                                                      java.nio.IntBuffer stride,
                                                      java.nio.IntBuffer layout,
                                                      java.nio.ByteBuffer old_buffer)

public static java.nio.ByteBuffer glMapTexture2DINTEL(int texture,
                                                      int level,
                                                      int access,
                                                      java.nio.IntBuffer stride,
                                                      java.nio.IntBuffer layout,
                                                      long length,
                                                      java.nio.ByteBuffer old_buffer)

Attempts to return a direct pointer to the graphics storage for 2D texture indicated by the texture parameter.

LWJGL note: If glMapTexture2DINTEL without an explicit length argument is used and direct-state-access functionality is not available in the current context, the texture object must currently be bound to the GL_TEXTURE_2D target.

Parameters:

texture - the texture to map

level - the mipmap level-of-detail of the texture

access - the type of access that will be performed by the application. One of:

MAP_READ_BIT

MAP_WRITE_BIT

stride - returns the distance in bytes between subsequent rows in the texture

layout - returns the internal layout of the texture in the graphics memory

glMapTexture2DINTEL

public static java.nio.ByteBuffer glMapTexture2DINTEL(int texture,
                                                      int level,
                                                      int access,
                                                      int[] stride,
                                                      int[] layout)

public static java.nio.ByteBuffer glMapTexture2DINTEL(int texture,
                                                      int level,
                                                      int access,
                                                      int[] stride,
                                                      int[] layout,
                                                      java.nio.ByteBuffer old_buffer)

public static java.nio.ByteBuffer glMapTexture2DINTEL(int texture,
                                                      int level,
                                                      int access,
                                                      int[] stride,
                                                      int[] layout,
                                                      long length,
                                                      java.nio.ByteBuffer old_buffer)

Array version of: MapTexture2DINTEL