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POTextures are stretched in android opengl es 2.0
 

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  1. POTextures are stretched in android opengl es 2.0
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    <p>I started from the google's android tutorial on open gl and then used this <a href="http://www.learnopengles.com/android-lesson-four-introducing-basic-texturing/" rel="nofollow noreferrer">tutorial</a>: to add textures. Since the class structures differ a bit, I had to do some code-moving-renaming. What i ended up is:</p> <p><img src="https://i.stack.imgur.com/QNRq7.png" alt="enter image description here"></p> <p><a href="https://dl.dropbox.com/u/16215704/temp/stars_1024.jpg" rel="nofollow noreferrer">Here</a> is the texture file i used. As one can see, the texture is somehow stretched along (1, 1), although the underlying object is a square. Here is my quad's code, any help is appreciated.</p> <pre><code>public class GLSquare implements IGLObject { private final String vertexShaderCode = // This matrix member variable provides a hook to manipulate // the coordinates of the objects that use this vertex shader "uniform mat4 uMVPMatrix;" + "attribute vec2 a_TexCoordinate;" + "varying vec2 v_TexCoordinate;" + "attribute vec4 vPosition;" + "void main() {" + // the matrix must be included as a modifier of gl_Position " gl_Position = uMVPMatrix * vPosition;" + "v_TexCoordinate = a_TexCoordinate;" + "}"; private final String fragmentShaderCode = "precision mediump float;" + "uniform sampler2D u_Texture;" + "varying vec2 v_TexCoordinate;" + "void main() {" + " gl_FragColor = texture2D(u_Texture, v_TexCoordinate);" + "}"; private final FloatBuffer vertexBuffer; private final ShortBuffer drawListBuffer; private final int mProgramHandle; private int mPositionHandle; private int mMVPMatrixHandle; private int mTextureDataHandle; /** The texture pointer */ // number of coordinates per vertex in this array static final int COORDS_PER_VERTEX = 3; static float squareCoords[] = { -10f, 10f, 0.0f, // top left -10f, -10f, 0.0f, // bottom left 10f, -10f, 0.0f, // bottom right 10f, 10f, 0.0f }; // top right private FloatBuffer textureBuffer; // buffer holding the texture coordinates private float texture[] = { // Mapping coordinates for the vertices 0.0f, 1.0f, // top left (V2) 0.0f, 0.0f, // bottom left (V1) 1.0f, 1.0f, // top right (V4) 1.0f, 0.0f // bottom right (V3) }; static float[] mTranslate = new float[16]; static float[] translatedMVP = new float[16]; private final short drawOrder[] = { 0, 1, 2, 0, 2, 3 }; public GLSquare(float x, float y, float z, Context context) { // initialize vertex byte buffer for shape coordinates ByteBuffer bb = ByteBuffer.allocateDirect(squareCoords.length * 4); bb.order(ByteOrder.nativeOrder()); vertexBuffer = bb.asFloatBuffer(); vertexBuffer.put(squareCoords); vertexBuffer.position(0); bb = ByteBuffer.allocateDirect(texture.length * 4); bb.order(ByteOrder.nativeOrder()); textureBuffer = bb.asFloatBuffer(); textureBuffer.put(texture); textureBuffer.position(0); // initialize byte buffer for the draw list ByteBuffer dlb = ByteBuffer.allocateDirect( // (# of coordinate values * 2 bytes per short) drawOrder.length * 2); dlb.order(ByteOrder.nativeOrder()); drawListBuffer = dlb.asShortBuffer(); drawListBuffer.put(drawOrder); drawListBuffer.position(0); Matrix.setIdentityM(mTranslate, 0); Matrix.translateM(mTranslate, 0, x, y, z); // prepare shaders and OpenGL program final int vertexShaderHandle = GLTools.compileShader( GLES20.GL_VERTEX_SHADER, vertexShaderCode); final int fragmentShaderHandle = GLTools.compileShader( GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode); mProgramHandle = GLTools.createAndLinkProgram(vertexShaderHandle, fragmentShaderHandle, new String[] { "a_Position", "a_Color", "a_TexCoordinate" }); // Load the texture mTextureDataHandle = GLTools.loadGLTexture(context, R.raw.stars1024); } public void draw(float[] vpMatrix) { // Add program to OpenGL environment GLES20.glUseProgram(mProgramHandle); // Pass in the position information vertexBuffer.position(0); GLES20.glVertexAttribPointer(mPositionHandle, 3, GLES20.GL_FLOAT, false, 0, vertexBuffer); GLES20.glEnableVertexAttribArray(mPositionHandle); int mTextureCoordinateHandle = GLES20.glGetAttribLocation( mProgramHandle, "a_TexCoordinate"); // Pass in the texture coordinate information textureBuffer.position(0); GLES20.glVertexAttribPointer(mTextureCoordinateHandle, 2, GLES20.GL_FLOAT, false, 0, textureBuffer); GLES20.glEnableVertexAttribArray(mTextureCoordinateHandle); mMVPMatrixHandle = GLES20.glGetUniformLocation(mProgramHandle, "uMVPMatrix"); WideOpenRenderer.checkGlError("glGetUniformLocation"); // Apply the projection and view transformation Matrix.multiplyMM(translatedMVP, 0, vpMatrix, 0, mTranslate, 0); GLES20.glUniformMatrix4fv(mMVPMatrixHandle, 1, false, translatedMVP, 0); // Draw the cube. GLES20.glDrawElements(GLES20.GL_TRIANGLES, drawOrder.length, GLES20.GL_UNSIGNED_SHORT, drawListBuffer); } } </code></pre> <p>here is the methode loading texture:</p> <pre><code>public static int loadGLTexture(Context context, final int resourceId) { Log.d("GLTools", "Loading texture..."); final int[] textureHandle = new int[1]; GLES20.glGenTextures(1, textureHandle, 0); if (textureHandle[0] != 0) { final BitmapFactory.Options options = new BitmapFactory.Options(); options.inScaled = false; // No pre-scaling // Read in the resource final Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resourceId, options); // Bind to the texture in OpenGL GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandle[0]); Log.d("GLTools", "Binding texture, setting parameter" + resourceId); // Set filtering GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST); GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST); // 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(); } if (textureHandle[0] == 0) { throw new RuntimeException("Error loading texture."); } return textureHandle[0]; } </code></pre>
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