/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.media.filterfw;
import android.graphics.Bitmap;
import android.opengl.GLES20;
import android.opengl.GLUtils;
import android.os.Looper;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* TODO: Make this package-private as RenderTarget and TextureSource should suffice as public
* facing OpenGL utilities.
* @hide
*/
public class GLToolbox {
public static int textureNone() {
return 0;
}
public static boolean isTexture(int texId) {
return GLES20.glIsTexture(texId);
}
public static void deleteTexture(int texId) {
int[] textures = new int[] { texId };
assertNonUiThread("glDeleteTextures");
GLES20.glDeleteTextures(1, textures, 0);
checkGlError("glDeleteTextures");
}
public static void deleteFbo(int fboId) {
int[] fbos = new int[] { fboId };
assertNonUiThread("glDeleteFramebuffers");
GLES20.glDeleteFramebuffers(1, fbos, 0);
checkGlError("glDeleteFramebuffers");
}
public static int generateTexture() {
int[] textures = new int[1];
GLES20.glGenTextures(1, textures, 0);
checkGlError("glGenTextures");
return textures[0];
}
public static int generateFbo() {
int[] fbos = new int[1];
GLES20.glGenFramebuffers(1, fbos, 0);
checkGlError("glGenFramebuffers");
return fbos[0];
}
public static void readFbo(int fboId, ByteBuffer pixels, int width, int height) {
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fboId);
GLES20.glReadPixels(0, 0, width, height, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, pixels);
checkGlError("glReadPixels");
}
public static void readTarget(RenderTarget target, ByteBuffer pixels, int width, int height) {
target.focus();
GLES20.glReadPixels(0, 0, width, height, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, pixels);
checkGlError("glReadPixels");
}
public static int attachedTexture(int fboId) {
int[] params = new int[1];
GLES20.glGetFramebufferAttachmentParameteriv(
GLES20.GL_FRAMEBUFFER,
GLES20.GL_COLOR_ATTACHMENT0,
GLES20.GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
params, 0);
checkGlError("glGetFramebufferAttachmentParameteriv");
return params[0];
}
public static void attachTextureToFbo(int texId, int fboId) {
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fboId);
GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER,
GLES20.GL_COLOR_ATTACHMENT0,
GLES20.GL_TEXTURE_2D,
texId,
0);
checkGlError("glFramebufferTexture2D");
}
public static void allocateTexturePixels(int texId, int target, int width, int height) {
setTexturePixels(texId, target, (ByteBuffer)null, width, height);
}
public static void setTexturePixels(int texId, int target, Bitmap bitmap) {
GLES20.glBindTexture(target, texId);
GLUtils.texImage2D(target, 0, bitmap, 0);
checkGlError("glTexImage2D");
setDefaultTexParams();
}
public static void setTexturePixels(int texId, int target, ByteBuffer pixels,
int width, int height) {
GLES20.glBindTexture(target, texId);
// For some devices, "pixels" being null causes system error.
if (pixels == null) {
pixels = ByteBuffer.allocateDirect(width * height * 4);
}
GLES20.glTexImage2D(target, 0, GLES20.GL_RGBA, width, height, 0,
GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, pixels);
checkGlError("glTexImage2D");
setDefaultTexParams();
}
public static void setDefaultTexParams() {
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
checkGlError("glTexParameteri");
}
public static int vboNone() {
return 0;
}
public static int generateVbo() {
int[] vbos = new int[1];
GLES20.glGenBuffers(1, vbos, 0);
checkGlError("glGenBuffers");
return vbos[0];
}
public static void setVboData(int vboId, ByteBuffer data) {
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, vboId);
GLES20.glBufferData(GLES20.GL_ARRAY_BUFFER, data.remaining(), data, GLES20.GL_STATIC_DRAW);
checkGlError("glBufferData");
}
public static void setVboFloats(int vboId, float[] values) {
int len = values.length * 4;
ByteBuffer buffer = ByteBuffer.allocateDirect(len).order(ByteOrder.nativeOrder());
setVboData(vboId, buffer);
}
public static boolean isVbo(int vboId) {
return GLES20.glIsBuffer(vboId);
}
public static void deleteVbo(int vboId) {
int[] buffers = new int[] { vboId };
GLES20.glDeleteBuffers(1, buffers, 0);
checkGlError("glDeleteBuffers");
}
public static void checkGlError(String operation) {
int error;
while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
throw new RuntimeException("GL Operation '" + operation + "' caused error "
+ Integer.toHexString(error) + "!");
}
}
/**
* Make sure we are not operating in the UI thread.
*
* It is often tricky to track down bugs that happen when issuing GL commands in the UI thread.
* This is especially true when releasing GL resources. Often this will cause errors much later
* on. Therefore we make sure we do not do these dangerous operations on the UI thread.
*/
private static void assertNonUiThread(String operation) {
if (Looper.getMainLooper().getThread() == Thread.currentThread()) {
throw new RuntimeException("Attempting to perform GL operation '" + operation
+ "' on UI thread!");
}
}
}