com.jogamp.opengl.util.awt.TextureRenderer Maven / Gradle / Ivy
/*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
* Copyright (c) 2010 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
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*
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* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
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* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
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* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
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*
* You acknowledge that this software is not designed or intended for use
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* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package com.jogamp.opengl.util.awt;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.gl2.*;
import com.jogamp.opengl.util.texture.*;
import com.jogamp.opengl.util.texture.awt.*;
/** Provides the ability to render into an OpenGL {@link
com.jogamp.opengl.util.texture.Texture Texture} using the Java 2D
APIs. This renderer class uses an internal Java 2D image (of
unspecified type) for its backing store and flushes portions of
that image to an OpenGL texture on demand. The resulting OpenGL
texture can then be mapped on to a polygon for display. */
public class TextureRenderer {
// For now, we supply only a BufferedImage back-end for this
// renderer. In theory we could use the Java 2D/JOGL bridge to fully
// accelerate the rendering paths, but there are restrictions on
// what work can be done where; for example, Graphics2D-related work
// must not be done on the Queue Flusher Thread, but JOGL's
// OpenGL-related work must be. This implies that the user's code
// would need to be split up into multiple callbacks run from the
// appropriate threads, which would be somewhat unfortunate.
// Whether we have an alpha channel in the (RGB/A) backing store
private boolean alpha;
// Whether we're using only a GL_INTENSITY backing store
private boolean intensity;
// Whether we're attempting to use automatic mipmap generation support
private boolean mipmap;
// Whether smoothing is enabled for the OpenGL texture (switching
// between GL_LINEAR and GL_NEAREST filtering)
private boolean smoothing = true;
private boolean smoothingChanged;
// The backing store itself
private BufferedImage image;
private Texture texture;
private AWTTextureData textureData;
private boolean mustReallocateTexture;
private Rectangle dirtyRegion;
private GLUgl2 glu = new GLUgl2();
// Current color
private float r = 1.0f;
private float g = 1.0f;
private float b = 1.0f;
private float a = 1.0f;
/** Creates a new renderer with backing store of the specified width
and height. If alpha is true, allocates an alpha
channel in the backing store image. No mipmap support is
requested.
@param width the width of the texture to render into
@param height the height of the texture to render into
@param alpha whether to allocate an alpha channel for the texture
*/
public TextureRenderer(int width, int height, boolean alpha) {
this(width, height, alpha, false);
}
/** Creates a new renderer with backing store of the specified width
and height. If alpha is true, allocates an alpha channel in the
backing store image. If mipmap is true, attempts to use OpenGL's
automatic mipmap generation for better smoothing when rendering
the TextureRenderer's contents at a distance.
@param width the width of the texture to render into
@param height the height of the texture to render into
@param alpha whether to allocate an alpha channel for the texture
@param mipmap whether to attempt use of automatic mipmap generation
*/
public TextureRenderer(int width, int height, boolean alpha, boolean mipmap) {
this(width, height, alpha, false, mipmap);
}
// Internal constructor to avoid confusion since alpha only makes
// sense when intensity is not set
private TextureRenderer(int width, int height, boolean alpha, boolean intensity, boolean mipmap) {
this.alpha = alpha;
this.intensity = intensity;
this.mipmap = mipmap;
init(width, height);
}
/** Creates a new renderer with a special kind of backing store
which acts only as an alpha channel. No mipmap support is
requested. Internally, this associates a GL_INTENSITY OpenGL
texture with the backing store. */
public static TextureRenderer createAlphaOnlyRenderer(int width, int height) {
return createAlphaOnlyRenderer(width, height, false);
}
/** Creates a new renderer with a special kind of backing store
which acts only as an alpha channel. If mipmap is
true, attempts to use OpenGL's automatic mipmap generation for
better smoothing when rendering the TextureRenderer's contents
at a distance. Internally, this associates a GL_INTENSITY OpenGL
texture with the backing store. */
public static TextureRenderer createAlphaOnlyRenderer(int width, int height, boolean mipmap) {
return new TextureRenderer(width, height, false, true, mipmap);
}
/** Returns the width of the backing store of this renderer.
@return the width of the backing store of this renderer
*/
public int getWidth() {
return image.getWidth();
}
/** Returns the height of the backing store of this renderer.
@return the height of the backing store of this renderer
*/
public int getHeight() {
return image.getHeight();
}
/** Returns the size of the backing store of this renderer in a
newly-allocated {@link java.awt.Dimension Dimension} object.
@return the size of the backing store of this renderer
*/
public Dimension getSize() {
return getSize(null);
}
/** Returns the size of the backing store of this renderer. Uses the
{@link java.awt.Dimension Dimension} object if one is supplied,
or allocates a new one if null is passed.
@param d a {@link java.awt.Dimension Dimension} object in which
to store the results, or null to allocate a new one
@return the size of the backing store of this renderer
*/
public Dimension getSize(Dimension d) {
if (d == null)
d = new Dimension();
d.setSize(image.getWidth(), image.getHeight());
return d;
}
/** Sets the size of the backing store of this renderer. This may
cause the OpenGL texture object associated with this renderer to
be invalidated; it is not recommended to cache this texture
object outside this class but to instead call {@link #getTexture
getTexture} when it is needed.
@param width the new width of the backing store of this renderer
@param height the new height of the backing store of this renderer
@throws GLException If an OpenGL context is not current when this method is called
*/
public void setSize(int width, int height) throws GLException {
init(width, height);
}
/** Sets the size of the backing store of this renderer. This may
cause the OpenGL texture object associated with this renderer to
be invalidated.
@param d the new size of the backing store of this renderer
@throws GLException If an OpenGL context is not current when this method is called
*/
public void setSize(Dimension d) throws GLException {
setSize(d.width, d.height);
}
/** Sets whether smoothing is enabled for the OpenGL texture; if so,
uses GL_LINEAR interpolation for the minification and
magnification filters. Defaults to true. Changes to this setting
will not take effect until the next call to {@link
#beginOrthoRendering beginOrthoRendering}.
@param smoothing whether smoothing is enabled for the OpenGL texture
*/
public void setSmoothing(boolean smoothing) {
this.smoothing = smoothing;
smoothingChanged = true;
}
/** Returns whether smoothing is enabled for the OpenGL texture; see
{@link #setSmoothing setSmoothing}. Defaults to true.
@return whether smoothing is enabled for the OpenGL texture
*/
public boolean getSmoothing() {
return smoothing;
}
/** Creates a {@link java.awt.Graphics2D Graphics2D} instance for
rendering to the backing store of this renderer. The returned
object should be disposed of using the normal {@link
java.awt.Graphics#dispose() Graphics.dispose()} method once it
is no longer being used.
@return a new {@link java.awt.Graphics2D Graphics2D} object for
rendering into the backing store of this renderer
*/
public Graphics2D createGraphics() {
return image.createGraphics();
}
/** Returns the underlying Java 2D {@link java.awt.Image Image}
being rendered into. */
public Image getImage() {
return image;
}
/** Marks the given region of the TextureRenderer as dirty. This
region, and any previously set dirty regions, will be
automatically synchronized with the underlying Texture during
the next {@link #getTexture getTexture} operation, at which
point the dirty region will be cleared. It is not necessary for
an OpenGL context to be current when this method is called.
@param x the x coordinate (in Java 2D coordinates -- relative to
upper left) of the region to update
@param y the y coordinate (in Java 2D coordinates -- relative to
upper left) of the region to update
@param width the width of the region to update
@param height the height of the region to update
*/
public void markDirty(int x, int y, int width, int height) {
Rectangle curRegion = new Rectangle(x, y, width, height);
if (dirtyRegion == null) {
dirtyRegion = curRegion;
} else {
dirtyRegion.add(curRegion);
}
}
/** Returns the underlying OpenGL Texture object associated with
this renderer, synchronizing any dirty regions of the
TextureRenderer with the underlying OpenGL texture.
@throws GLException If an OpenGL context is not current when this method is called
*/
public Texture getTexture() throws GLException {
if (dirtyRegion != null) {
sync(dirtyRegion.x, dirtyRegion.y, dirtyRegion.width, dirtyRegion.height);
dirtyRegion = null;
}
ensureTexture();
return texture;
}
/** Disposes all resources associated with this renderer. It is not
valid to use this renderer after calling this method.
@throws GLException If an OpenGL context is not current when this method is called
*/
public void dispose() throws GLException {
if (texture != null) {
texture.destroy(GLContext.getCurrentGL());
texture = null;
}
if (image != null) {
image.flush();
image = null;
}
}
/** Convenience method which assists in rendering portions of the
OpenGL texture to the screen, if the application intends to draw
them as a flat overlay on to the screen. Pushes OpenGL state
bits (GL_ENABLE_BIT, GL_DEPTH_BUFFER_BIT and GL_TRANSFORM_BIT);
disables the depth test, back-face culling, and lighting;
enables the texture in this renderer; and sets up the viewing
matrices for orthographic rendering where the coordinates go
from (0, 0) at the lower left to (width, height) at the upper
right. Equivalent to beginOrthoRendering(width, height, true).
{@link #endOrthoRendering} must be used in conjunction with this
method to restore all OpenGL states.
@param width the width of the current on-screen OpenGL drawable
@param height the height of the current on-screen OpenGL drawable
@throws GLException If an OpenGL context is not current when this method is called
*/
public void beginOrthoRendering(int width, int height) throws GLException {
beginOrthoRendering(width, height, true);
}
/** Convenience method which assists in rendering portions of the
OpenGL texture to the screen, if the application intends to draw
them as a flat overlay on to the screen. Pushes OpenGL state
bits (GL_ENABLE_BIT, GL_DEPTH_BUFFER_BIT and GL_TRANSFORM_BIT);
disables the depth test (if the "disableDepthTest" argument is
true), back-face culling, and lighting; enables the texture in
this renderer; and sets up the viewing matrices for orthographic
rendering where the coordinates go from (0, 0) at the lower left
to (width, height) at the upper right. {@link
#endOrthoRendering} must be used in conjunction with this method
to restore all OpenGL states.
@param width the width of the current on-screen OpenGL drawable
@param height the height of the current on-screen OpenGL drawable
@param disableDepthTest whether the depth test should be disabled
@throws GLException If an OpenGL context is not current when this method is called
*/
public void beginOrthoRendering(int width, int height, boolean disableDepthTest) throws GLException {
beginRendering(true, width, height, disableDepthTest);
}
/** Convenience method which assists in rendering portions of the
OpenGL texture to the screen as 2D quads in 3D space. Pushes
OpenGL state (GL_ENABLE_BIT); disables lighting; and enables the
texture in this renderer. Unlike {@link #beginOrthoRendering
beginOrthoRendering}, does not modify the depth test, back-face
culling, lighting, or the modelview or projection matrices. The
user is responsible for setting up the view matrices for correct
results of {@link #draw3DRect draw3DRect}. {@link
#end3DRendering} must be used in conjunction with this method to
restore all OpenGL states.
@throws GLException If an OpenGL context is not current when this method is called
*/
public void begin3DRendering() throws GLException {
beginRendering(false, 0, 0, false);
}
/** Changes the color of the polygons, and therefore the drawn
images, this TextureRenderer produces. Use of this method is
optional. The TextureRenderer uses the GL_MODULATE texture
environment mode, which causes the portions of the rendered
texture to be multiplied by the color of the rendered
polygons. The polygon color can be varied to achieve effects
like tinting of the overall output or fading in and out by
changing the alpha of the color.
Each component ranges from 0.0f - 1.0f. The alpha component, if
used, does not need to be premultiplied into the color channels
as described in the documentation for {@link
com.jogamp.opengl.util.texture.Texture Texture}, although
premultiplied colors are used internally. The default color is
opaque white.
@param r the red component of the new color
@param g the green component of the new color
@param b the blue component of the new color
@param a the alpha component of the new color, 0.0f = completely
transparent, 1.0f = completely opaque
@throws GLException If an OpenGL context is not current when this method is called
*/
public void setColor(float r, float g, float b, float a) throws GLException {
GL2 gl = GLContext.getCurrentGL().getGL2();
this.r = r * a;
this.g = g * a;
this.b = b * a;
this.a = a;
gl.glColor4f(this.r, this.g, this.b, this.a);
}
private float[] compArray;
/** Changes the current color of this TextureRenderer to the
supplied one. The default color is opaque white. See {@link
#setColor(float,float,float,float) setColor} for more details.
@param color the new color to use for rendering
@throws GLException If an OpenGL context is not current when this method is called
*/
public void setColor(Color color) throws GLException {
// Get color's RGBA components as floats in the range [0,1].
if (compArray == null) {
compArray = new float[4];
}
color.getRGBComponents(compArray);
setColor(compArray[0], compArray[1], compArray[2], compArray[3]);
}
/** Draws an orthographically projected rectangle containing all of
the underlying texture to the specified location on the
screen. All (x, y) coordinates are specified relative to the
lower left corner of either the texture image or the current
OpenGL drawable. This method is equivalent to
drawOrthoRect(screenx, screeny, 0, 0, getWidth(),
getHeight());.
@param screenx the on-screen x coordinate at which to draw the rectangle
@param screeny the on-screen y coordinate (relative to lower left) at
which to draw the rectangle
@throws GLException If an OpenGL context is not current when this method is called
*/
public void drawOrthoRect(int screenx, int screeny) throws GLException {
drawOrthoRect(screenx, screeny, 0, 0, getWidth(), getHeight());
}
/** Draws an orthographically projected rectangle of the underlying
texture to the specified location on the screen. All (x, y)
coordinates are specified relative to the lower left corner of
either the texture image or the current OpenGL drawable.
@param screenx the on-screen x coordinate at which to draw the rectangle
@param screeny the on-screen y coordinate (relative to lower left) at
which to draw the rectangle
@param texturex the x coordinate of the pixel in the texture of
the lower left portion of the rectangle to draw
@param texturey the y coordinate of the pixel in the texture
(relative to lower left) of the lower left portion of the
rectangle to draw
@param width the width of the rectangle to draw
@param height the height of the rectangle to draw
@throws GLException If an OpenGL context is not current when this method is called
*/
public void drawOrthoRect(int screenx, int screeny,
int texturex, int texturey,
int width, int height) throws GLException {
draw3DRect(screenx, screeny, 0, texturex, texturey, width, height, 1);
}
/** Draws a rectangle of the underlying texture to the specified 3D
location. In the current coordinate system, the lower left
corner of the rectangle is placed at (x, y, z), and the upper
right corner is placed at (x + width * scaleFactor, y + height *
scaleFactor, z). The lower left corner of the sub-rectangle of
the texture is (texturex, texturey) and the upper right corner
is (texturex + width, texturey + height). For back-face culling
purposes, the rectangle is drawn with counterclockwise
orientation of the vertices when viewed from the front.
@param x the x coordinate at which to draw the rectangle
@param y the y coordinate at which to draw the rectangle
@param z the z coordinate at which to draw the rectangle
@param texturex the x coordinate of the pixel in the texture of
the lower left portion of the rectangle to draw
@param texturey the y coordinate of the pixel in the texture
(relative to lower left) of the lower left portion of the
rectangle to draw
@param width the width in texels of the rectangle to draw
@param height the height in texels of the rectangle to draw
@param scaleFactor the scale factor to apply (multiplicatively)
to the size of the drawn rectangle
@throws GLException If an OpenGL context is not current when this method is called
*/
public void draw3DRect(float x, float y, float z,
int texturex, int texturey,
int width, int height,
float scaleFactor) throws GLException {
GL2 gl = GLContext.getCurrentGL().getGL2();
Texture texture = getTexture();
TextureCoords coords = texture.getSubImageTexCoords(texturex, texturey,
texturex + width,
texturey + height);
gl.glBegin(GL2.GL_QUADS);
gl.glTexCoord2f(coords.left(), coords.bottom());
gl.glVertex3f(x, y, z);
gl.glTexCoord2f(coords.right(), coords.bottom());
gl.glVertex3f(x + width * scaleFactor, y, z);
gl.glTexCoord2f(coords.right(), coords.top());
gl.glVertex3f(x + width * scaleFactor, y + height * scaleFactor, z);
gl.glTexCoord2f(coords.left(), coords.top());
gl.glVertex3f(x, y + height * scaleFactor, z);
gl.glEnd();
}
/** Convenience method which assists in rendering portions of the
OpenGL texture to the screen, if the application intends to draw
them as a flat overlay on to the screen. Must be used if {@link
#beginOrthoRendering} is used to set up the rendering stage for
this overlay.
@throws GLException If an OpenGL context is not current when this method is called
*/
public void endOrthoRendering() throws GLException {
endRendering(true);
}
/** Convenience method which assists in rendering portions of the
OpenGL texture to the screen as 2D quads in 3D space. Must be
used if {@link #begin3DRendering} is used to set up the
rendering stage for this overlay.
@throws GLException If an OpenGL context is not current when this method is called
*/
public void end3DRendering() throws GLException {
endRendering(false);
}
/** Indicates whether automatic mipmap generation is in use for this
TextureRenderer. The result of this method may change from true
to false if it is discovered during allocation of the
TextureRenderer's backing store that automatic mipmap generation
is not supported at the OpenGL level. */
public boolean isUsingAutoMipmapGeneration() {
return mipmap;
}
//----------------------------------------------------------------------
// Internals only below this point
//
private void beginRendering(boolean ortho, int width, int height, boolean disableDepthTestForOrtho) {
GL2 gl = GLContext.getCurrentGL().getGL2();
int attribBits =
GL2.GL_ENABLE_BIT | GL2.GL_TEXTURE_BIT | GL2.GL_COLOR_BUFFER_BIT |
(ortho ? (GL2.GL_DEPTH_BUFFER_BIT | GL2.GL_TRANSFORM_BIT) : 0);
gl.glPushAttrib(attribBits);
gl.glDisable(GL2.GL_LIGHTING);
if (ortho) {
if (disableDepthTestForOrtho) {
gl.glDisable(GL2.GL_DEPTH_TEST);
}
gl.glDisable(GL2.GL_CULL_FACE);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glPushMatrix();
gl.glLoadIdentity();
glu.gluOrtho2D(0, width, 0, height);
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glPushMatrix();
gl.glLoadIdentity();
gl.glMatrixMode(GL2.GL_TEXTURE);
gl.glPushMatrix();
gl.glLoadIdentity();
}
gl.glEnable(GL2.GL_BLEND);
gl.glBlendFunc(GL2.GL_ONE, GL2.GL_ONE_MINUS_SRC_ALPHA);
Texture texture = getTexture();
texture.enable(gl);
texture.bind(gl);
gl.glTexEnvi(GL2.GL_TEXTURE_ENV, GL2.GL_TEXTURE_ENV_MODE, GL2.GL_MODULATE);
// Change polygon color to last saved
gl.glColor4f(r, g, b, a);
if (smoothingChanged) {
smoothingChanged = false;
if (smoothing) {
texture.setTexParameteri(gl, GL2.GL_TEXTURE_MAG_FILTER, GL2.GL_LINEAR);
if (mipmap) {
texture.setTexParameteri(gl, GL2.GL_TEXTURE_MIN_FILTER, GL2.GL_LINEAR_MIPMAP_LINEAR);
} else {
texture.setTexParameteri(gl, GL2.GL_TEXTURE_MIN_FILTER, GL2.GL_LINEAR);
}
} else {
texture.setTexParameteri(gl, GL2.GL_TEXTURE_MIN_FILTER, GL2.GL_NEAREST);
texture.setTexParameteri(gl, GL2.GL_TEXTURE_MAG_FILTER, GL2.GL_NEAREST);
}
}
}
private void endRendering(boolean ortho) {
GL2 gl = GLContext.getCurrentGL().getGL2();
Texture texture = getTexture();
texture.disable(gl);
if (ortho) {
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glPopMatrix();
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glPopMatrix();
gl.glMatrixMode(GL2.GL_TEXTURE);
gl.glPopMatrix();
}
gl.glPopAttrib();
}
private void init(int width, int height) {
GL2 gl = GLContext.getCurrentGL().getGL2();
// Discard previous BufferedImage if any
if (image != null) {
image.flush();
image = null;
}
// Infer the internal format if not an intensity texture
int internalFormat = (intensity ? GL2.GL_INTENSITY : 0);
int imageType =
(intensity ? BufferedImage.TYPE_BYTE_GRAY :
(alpha ? BufferedImage.TYPE_INT_ARGB_PRE : BufferedImage.TYPE_INT_RGB));
image = new BufferedImage(width, height, imageType);
// Always realllocate the TextureData associated with this
// BufferedImage; it's just a reference to the contents but we
// need it in order to update sub-regions of the underlying
// texture
textureData = new AWTTextureData(gl.getGLProfile(), internalFormat, 0, mipmap, image);
// For now, always reallocate the underlying OpenGL texture when
// the backing store size changes
mustReallocateTexture = true;
}
/** Synchronizes the specified region of the backing store down to
the underlying OpenGL texture. If {@link #markDirty markDirty}
is used instead to indicate the regions that are out of sync,
this method does not need to be called.
@param x the x coordinate (in Java 2D coordinates -- relative to
upper left) of the region to update
@param y the y coordinate (in Java 2D coordinates -- relative to
upper left) of the region to update
@param width the width of the region to update
@param height the height of the region to update
@throws GLException If an OpenGL context is not current when this method is called
*/
private void sync(int x, int y, int width, int height) throws GLException {
// Force allocation if necessary
boolean canSkipUpdate = ensureTexture();
if (!canSkipUpdate) {
// Update specified region.
// NOTE that because BufferedImage-based TextureDatas now don't
// do anything to their contents, the coordinate systems for
// OpenGL and Java 2D actually line up correctly for
// updateSubImage calls, so we don't need to do any argument
// conversion here (i.e., flipping the Y coordinate).
texture.updateSubImage(GLContext.getCurrentGL(), textureData, 0, x, y, x, y, width, height);
}
}
// Returns true if the texture was newly allocated, false if not
private boolean ensureTexture() {
GL gl = GLContext.getCurrentGL();
if (mustReallocateTexture) {
if (texture != null) {
texture.destroy(gl);
texture = null;
}
mustReallocateTexture = false;
}
if (texture == null) {
texture = TextureIO.newTexture(textureData);
if (mipmap && !texture.isUsingAutoMipmapGeneration()) {
// Only try this once
texture.destroy(gl);
mipmap = false;
textureData.setMipmap(false);
texture = TextureIO.newTexture(textureData);
}
if (!smoothing) {
// The TextureIO classes default to GL_LINEAR filtering
texture.setTexParameteri(gl, GL2.GL_TEXTURE_MIN_FILTER, GL2.GL_NEAREST);
texture.setTexParameteri(gl, GL2.GL_TEXTURE_MAG_FILTER, GL2.GL_NEAREST);
}
return true;
}
return false;
}
}