blob: fd52c37eb4c085ae374ece167cf26e921b57b032 [file] [log] [blame]
/*
* libjingle
* Copyright 2015 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.webrtc;
import android.opengl.GLES20;
/**
* Helper class for handling OpenGL framebuffer with only color attachment and no depth or stencil
* buffer. Intended for simple tasks such as texture copy, texture downscaling, and texture color
* conversion.
*/
// TODO(magjed): Add unittests for this class.
public class GlTextureFrameBuffer {
private final int frameBufferId;
private final int textureId;
private final int pixelFormat;
private int width;
private int height;
/**
* Generate texture and framebuffer resources. An EGLContext must be bound on the current thread
* when calling this function. The framebuffer is not complete until setSize() is called.
*/
public GlTextureFrameBuffer(int pixelFormat) {
switch (pixelFormat) {
case GLES20.GL_LUMINANCE:
case GLES20.GL_RGB:
case GLES20.GL_RGBA:
this.pixelFormat = pixelFormat;
break;
default:
throw new IllegalArgumentException("Invalid pixel format: " + pixelFormat);
}
textureId = GlUtil.generateTexture(GLES20.GL_TEXTURE_2D);
this.width = 0;
this.height = 0;
// Create framebuffer object and bind it.
final int frameBuffers[] = new int[1];
GLES20.glGenFramebuffers(1, frameBuffers, 0);
frameBufferId = frameBuffers[0];
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, frameBufferId);
GlUtil.checkNoGLES2Error("Generate framebuffer");
// Attach the texture to the framebuffer as color attachment.
GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0,
GLES20.GL_TEXTURE_2D, textureId, 0);
GlUtil.checkNoGLES2Error("Attach texture to framebuffer");
// Restore normal framebuffer.
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
}
/**
* (Re)allocate texture. Will do nothing if the requested size equals the current size. An
* EGLContext must be bound on the current thread when calling this function. Must be called at
* least once before using the framebuffer. May be called multiple times to change size.
*/
public void setSize(int width, int height) {
if (width == 0 || height == 0) {
throw new IllegalArgumentException("Invalid size: " + width + "x" + height);
}
if (width == this.width && height == this.height) {
return;
}
this.width = width;
this.height = height;
// Bind our framebuffer.
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, frameBufferId);
GlUtil.checkNoGLES2Error("glBindFramebuffer");
// Allocate texture.
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);
GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, pixelFormat, width, height, 0, pixelFormat,
GLES20.GL_UNSIGNED_BYTE, null);
// Check that the framebuffer is in a good state.
final int status = GLES20.glCheckFramebufferStatus(GLES20.GL_FRAMEBUFFER);
if (status != GLES20.GL_FRAMEBUFFER_COMPLETE) {
throw new IllegalStateException("Framebuffer not complete, status: " + status);
}
// Restore normal framebuffer.
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0);
}
public int getWidth() {
return width;
}
public int getHeight() {
return height;
}
public int getFrameBufferId() {
return frameBufferId;
}
public int getTextureId() {
return textureId;
}
/**
* Release texture and framebuffer. An EGLContext must be bound on the current thread when calling
* this function. This object should not be used after this call.
*/
public void release() {
GLES20.glDeleteTextures(1, new int[] {textureId}, 0);
GLES20.glDeleteFramebuffers(1, new int[] {frameBufferId}, 0);
width = 0;
height = 0;
}
}