/**
* Copyright 2012 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 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.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``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 JogAmp Community OR
* CONTRIBUTORS 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.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package com.jogamp.opengl.util.texture;
import javax.media.opengl.GL;
/**
* Protocol for texture sequences, like animations, movies, etc.
* <p>
* Ensure to respect the texture coordinates provided by
* {@link TextureFrame}.{@link TextureFrame#getTexture() getTexture()}.{@link Texture#getImageTexCoords() getImageTexCoords()}.
* </p>
* The user's shader shall be fitted for this implementation.
* Assuming we use a base shader code w/o headers using </code>ShaderCode</code>.
* (Code copied from unit test / demo <code>TexCubeES2</code>)
* <pre>
*
static final String[] es2_prelude = { "#version 100\n", "precision mediump float;\n" };
static final String gl2_prelude = "#version 110\n";
static final String shaderBasename = "texsequence_xxx"; // the base shader code w/o headers
static final String myTextureLookupName = "myTexture2D"; // the desired texture lookup function
private void initShader(GL2ES2 gl, TextureSequence texSeq) {
// Create & Compile the shader objects
ShaderCode rsVp = ShaderCode.create(gl, GL2ES2.GL_VERTEX_SHADER, TexCubeES2.class,
"shader", "shader/bin", shaderBasename, true);
ShaderCode rsFp = ShaderCode.create(gl, GL2ES2.GL_FRAGMENT_SHADER, TexCubeES2.class,
"shader", "shader/bin", shaderBasename, true);
// Prelude shader code w/ GLSL profile specifics [ 1. pre-proc, 2. other ]
int rsFpPos;
if(gl.isGLES2()) {
// insert ES2 version string in beginning
rsVp.insertShaderSource(0, 0, es2_prelude[0]);
rsFpPos = rsFp.insertShaderSource(0, 0, es2_prelude[0]);
} else {
// insert GL2 version string in beginning
rsVp.insertShaderSource(0, 0, gl2_prelude);
rsFpPos = rsFp.insertShaderSource(0, 0, gl2_prelude);
}
// insert required extensions as determined by TextureSequence implementation.
rsFpPos = rsFp.insertShaderSource(0, rsFpPos, texSeq.getRequiredExtensionsShaderStub());
if(gl.isGLES2()) {
// insert ES2 default precision declaration
rsFpPos = rsFp.insertShaderSource(0, rsFpPos, es2_prelude[1]);
}
// negotiate the texture lookup function name
final String texLookupFuncName = texSeq.getTextureLookupFunctionName(myTextureLookupName);
// in case a fixed lookup function is being chosen, replace the name in our code
rsFp.replaceInShaderSource(myTextureLookupName, texLookupFuncName);
// Cache the TextureSequence shader details in StringBuffer:
final StringBuilder sFpIns = new StringBuilder();
// .. declaration of the texture sampler using the implementation specific type
sFpIns.append("uniform ").append(texSeq.getTextureSampler2DType()).append(" mgl_ActiveTexture;\n");
// .. the actual texture lookup function, maybe null in case a built-in function is being used
sFpIns.append(texSeq.getTextureLookupFragmentShaderImpl());
// Now insert the TextureShader details in our shader after the given tag:
rsFp.insertShaderSource(0, "TEXTURE-SEQUENCE-CODE-BEGIN", 0, sFpIns);
// Create & Link the shader program
ShaderProgram sp = new ShaderProgram();
sp.add(rsVp);
sp.add(rsFp);
if(!sp.link(gl, System.err)) {
throw new GLException("Couldn't link program: "+sp);
}
...
* </pre>
* The above procedure might look complicated, however, it allows most flexibility and
* workarounds to also deal with GLSL bugs.
*
*/
public interface TextureSequence {
public static final String GL_OES_EGL_image_external_Required_Prelude = "#extension GL_OES_EGL_image_external : enable\n";
public static final String samplerExternalOES = "samplerExternalOES";
public static final String sampler2D = "sampler2D";
/**
* Texture holder interface, maybe specialized by implementation
* to associated related data.
*/
public static class TextureFrame {
public TextureFrame(Texture t) {
texture = t;
}
public final Texture getTexture() { return texture; }
public String toString() {
return "TextureFrame[" + texture + "]";
}
protected final Texture texture;
}
public interface TexSeqEventListener<T extends TextureSequence> {
/**
* Signaling listeners that {@link TextureSequence#getNextTexture(GL, boolean)} is able to deliver a new frame.
* @param ts the event source
* @param when system time in msec.
**/
public void newFrameAvailable(T ts, long when);
}
/** Return the texture unit to be used with this frame. */
public int getTextureUnit();
public int[] getTextureMinMagFilter();
public int[] getTextureWrapST();
/**
* Returns the last updated texture.
* <p>
* In case the instance is just initialized, it shall return a <code>TextureFrame</code>
* object with valid attributes. The texture content may be undefined
* until the first call of {@link #getNextTexture(GL, boolean)}.<br>
* </p>
* Not blocking.
*
* @throws IllegalStateException if instance is not initialized
*/
public TextureFrame getLastTexture() throws IllegalStateException ;
/**
* Returns the next texture to be rendered.
* <p>
* Implementation shall block until next frame is available if <code>blocking</code> is <code>true</code>,
* otherwise it shall return the last frame in case a new frame is not available.
* </p>
* <p>
* Shall return <code>null</code> in case <i>no</i> frame is available.
* </p>
*
* @throws IllegalStateException if instance is not initialized
*/
public TextureFrame getNextTexture(GL gl, boolean blocking) throws IllegalStateException ;
/**
* In case a shader extension is required, based on the implementation
* and the runtime GL profile, this method returns the preprocessor macros, e.g.:
* <pre>
* #extension GL_OES_EGL_image_external : enable
* </pre>
*
* @throws IllegalStateException if instance is not initialized
*/
public String getRequiredExtensionsShaderStub() throws IllegalStateException ;
/**
* Returns either <code>sampler2D</code> or <code>samplerExternalOES</code>
* depending on {@link #getLastTexture()}.{@link TextureFrame#getTexture() getTexture()}.{@link Texture#getTarget() getTarget()}.
*
* @throws IllegalStateException if instance is not initialized
**/
public String getTextureSampler2DType() throws IllegalStateException ;
/**
* @param desiredFuncName desired lookup function name. If <code>null</code> or ignored by the implementation,
* a build-in name is returned.
* @return the final lookup function name
*
* @see {@link #getTextureLookupFragmentShaderImpl()}
*
* @throws IllegalStateException if instance is not initialized
*/
public String getTextureLookupFunctionName(String desiredFuncName) throws IllegalStateException ;
/**
* Returns the complete texture2D lookup function code of type
* <pre>
* vec4 <i>funcName</i>(in <i>getTextureSampler2DType()</i> image, in vec2 texCoord) {
* vec4 texColor = do_something_with(image, texCoord);
* return texColor;
* }
* </pre>
* <p>
* <i>funcName</i> can be negotiated and queried via {@link #getTextureLookupFunctionName(String)}.
* </p>
* Note: This function may return an empty string in case a build-in lookup
* function is being chosen. If the implementation desires so,
* {@link #getTextureLookupFunctionName(String)} will ignore the desired function name
* and returns the build-in lookup function name.
* </p>
* @see #getTextureLookupFunctionName(String)
* @see #getTextureSampler2DType()
*
* @throws IllegalStateException if instance is not initialized
*/
public String getTextureLookupFragmentShaderImpl() throws IllegalStateException ;
}