com.android.grafika.gles

Class GlUtil

java.lang.Object

com.android.grafika.gles.GlUtil

public class GlUtil
extends Object

Some OpenGL utility functions.

Field Summary

Fields

Modifier and Type	Field and Description
static float[]	IDENTITY_MATRIX Identity matrix for general use.

Method Summary

Modifier and Type	Method and Description
static void	checkGlError(String op) Checks to see if a GLES error has been raised.
static void	checkLocation(int location, String label) Checks to see if the location we obtained is valid.
static FloatBuffer	createFloatBuffer(float[] coords) Allocates a direct float buffer, and populates it with the float array data.
static int	createImageTexture(ByteBuffer data, int width, int height, int format) Creates a texture from raw data.
static int	createProgram(String vertexSource, String fragmentSource) Creates a new program from the supplied vertex and fragment shaders.
static int	loadShader(int shaderType, String source) Compiles the provided shader source.
static void	logVersionInfo() Writes GL version info to the log.

Methods inherited from class java.lang.Object

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

Field Detail

IDENTITY_MATRIX

public static final float[] IDENTITY_MATRIX

Identity matrix for general use. Don't modify or life will get weird.

Method Detail

createProgram

public static int createProgram(String vertexSource,
                                String fragmentSource)

Creates a new program from the supplied vertex and fragment shaders.

Returns:

A handle to the program, or 0 on failure.

loadShader

public static int loadShader(int shaderType,
                             String source)

Compiles the provided shader source.

Returns:

A handle to the shader, or 0 on failure.

checkGlError

public static void checkGlError(String op)

Checks to see if a GLES error has been raised.

checkLocation

public static void checkLocation(int location,
                                 String label)

Checks to see if the location we obtained is valid. GLES returns -1 if a label could not be found, but does not set the GL error.

Throws a RuntimeException if the location is invalid.

createImageTexture

public static int createImageTexture(ByteBuffer data,
                                     int width,
                                     int height,
                                     int format)

Creates a texture from raw data.

Parameters:

data - Image data, in a "direct" ByteBuffer.

width - Texture width, in pixels (not bytes).

height - Texture height, in pixels.

format - Image data format (use constant appropriate for glTexImage2D(), e.g. GL_RGBA).

Returns:

Handle to texture.

createFloatBuffer

public static FloatBuffer createFloatBuffer(float[] coords)

Allocates a direct float buffer, and populates it with the float array data.

logVersionInfo

public static void logVersionInfo()

Writes GL version info to the log.