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POTwo textures with different texture coordinates in OpenGL ES 2.0
 

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  1. POTwo textures with different texture coordinates in OpenGL ES 2.0
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    <p>Brief: when I apply to one fragment shader two textures with two different texture coordinates, I see only first texture. But when I use one texture coordinate for two textures it works fine and I can see both textures.</p> <p>I work with photo filters and use OpenGL ES 2.0 to make filters. Some filters have an advance texture. First texture is a photo and second is a tracery. </p> <p>Here is my vertext shader</p> <pre><code>attribute vec4 position; attribute vec4 inputTextureCoordinate; attribute vec4 inputTextureCoordinate2; varying vec2 textureCoordinate; varying vec2 textureCoordinate2; void main() { gl_Position = position; textureCoordinate = inputTextureCoordinate.xy; textureCoordinate2 = inputTextureCoordinate2.xy; } </code></pre> <p>Here is my fragment shader</p> <pre><code>precision mediump float; uniform sampler2D inputImageTexture1; uniform sampler2D inputImageTexture2; varying vec2 textureCoordinate; varying vec2 textureCoordinate2; void main() { mediump vec4 color1 = texture2D(inputImageTexture1, textureCoordinate); mediump vec4 color2 = texture2D(inputImageTexture2, textureCoordinate2); mediump vec3 colorResult = mix(color1.rgb, color2.rgb, 0.5); gl_FragColor = vec4(colorResult, 1.0); } </code></pre> <p>In my code I use GLSurfaceView.Render implementation.</p> <p>Initialization of coordinates:</p> <pre><code>static final float CUBE[] = {-1.0f, 1.0f, 1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f,}; public static final float COORDINATES1[] = {0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,}; public static final float COORDINATES2[] = {0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,}; ... mGLCubeBuffer = ByteBuffer.allocateDirect(CUBE.length * 4).order(ByteOrder.nativeOrder()).asFloatBuffer(); mGLCubeBuffer.put(CUBE).position(0); mGLTextureCoordinates1 = ByteBuffer.allocateDirect(COORDINATES1.length * 4).order(ByteOrder.nativeOrder()) .asFloatBuffer(); mGLTextureCoordinates1.clear(); mGLTextureCoordinates1.put(COORDINATES1).position(0); mGLTextureCoordinates2 = ByteBuffer.allocateDirect(COORDINATES2.length * 4).order(ByteOrder.nativeOrder()) .asFloatBuffer(); mGLTextureCoordinates2.clear(); mGLTextureCoordinates1.put(COORDINATES2).position(0); </code></pre> <p><code>onSurfaceCreate</code> method: </p> <pre><code>@Override public void onSurfaceCreated(GL10 gl, EGLConfig config) { GLES20.glClearColor(0, 0, 0, 1); GLES20.glDisable(GLES20.GL_DEPTH_TEST); GLES20.glDisable(GLES20.GL_DEPTH_BITS); String vertexShader = RawResourceReader.readTextFileFromRawResource(mContext, R.raw.test_vertex); String fragmentShader = RawResourceReader.readTextFileFromRawResource(mContext, R.raw.test_fragment); mGLProgId = loadProgram(vertexShader, fragmentShader); mGLAttribPosition = GLES20.glGetAttribLocation(mGLProgId, "position"); mGLAttribTextureCoordinate = GLES20.glGetAttribLocation(mGLProgId, "inputTextureCoordinate"); mGLAttribTextureCoordinate2 = GLES20.glGetAttribLocation(mGLProgId, "inputTextureCoordinate2"); mGLUniformTexture1 = GLES20.glGetUniformLocation(mGLProgId, "inputImageTexture1"); mGLUniformTexture2 = GLES20.glGetUniformLocation(mGLProgId, "inputImageTexture2"); mTexture1 = loadTexture(mContext, R.drawable.photo); mTexture2 = loadTexture(mContext, R.drawable.formula1); } </code></pre> <p><code>onDrawFrame</code> method:</p> <pre><code> @Override public void onDrawFrame(GL10 gl) { GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT); GLES20.glUseProgram(mGLProgId); mGLCubeBuffer.position(0); GLES20.glVertexAttribPointer(mGLAttribPosition, 2, GLES20.GL_FLOAT, false, 0, mGLCubeBuffer); GLES20.glEnableVertexAttribArray(mGLAttribPosition); //set first coordinates mGLTextureCoordinates1.position(0); GLES20.glVertexAttribPointer(mGLAttribTextureCoordinate, 2, GLES20.GL_FLOAT, false, 0, mGLTextureCoordinates1); GLES20.glEnableVertexAttribArray(mGLAttribTextureCoordinate); //set second coordinates mGLTextureCoordinates2.position(0); GLES20.glVertexAttribPointer(mGLAttribTextureCoordinate2, 2, GLES20.GL_FLOAT, false, 0, mGLTextureCoordinates2); GLES20.glEnableVertexAttribArray(mGLAttribTextureCoordinate2); GLES20.glActiveTexture(GLES20.GL_TEXTURE0); GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTexture1); GLES20.glUniform1i(mGLUniformTexture1, 0); GLES20.glActiveTexture(GLES20.GL_TEXTURE1); GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTexture2); GLES20.glUniform1i(mGLUniformTexture2, 1); GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4); GLES20.glDisableVertexAttribArray(mGLAttribPosition); GLES20.glDisableVertexAttribArray(mGLAttribTextureCoordinate); GLES20.glDisableVertexAttribArray(mGLAttribTextureCoordinate2); GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0); } </code></pre> <p>Significant part of <code>loadTexture</code> method:</p> <pre><code> GLES20.glGenTextures(1, textureHandle, 0); // Bind to the texture in OpenGL GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandle[0]); // Set filtering GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE); GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_CONSTANT_ALPHA); GLES20.glEnable(GLES20.GL_BLEND); // Load the bitmap into the bound texture. GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0); // Recycle the bitmap, since its data has been loaded into OpenGL. bitmap.recycle(); </code></pre> <p>Note that on iOs it works fine, but there is used some library. I tried to use library jp.co.cyberagent.android.gpuimage but it has a few bugs and doesn't work properly with this problem. </p> <p>I want to know how solve this problem. It mays be some property which I don't know or something else. I'm new in OpenGL and hope to your help.</p>
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    1. USSergei Vasilenko
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    1. COWhy do you enable blending ? With such an uncommon blendFunc ?
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      1. POTwo textures with different texture coordinates in OpenGL ES 2.0
      1. USrotoglup
    2. COI found it as solution of another problem and I thought it can help me with my problem. But it is useless now.
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      1. POTwo textures with different texture coordinates in OpenGL ES 2.0
      1. USSergei Vasilenko
 

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