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    <p>Well I have figured it out. It turns out the BitmapFactory was scaling my images to a non power of 2 size so it would not work. GLSurfaceView supports the OpenGL ES 1.0 way of doing things, you just draw on-screen. I can use framebuffers, but to I have to link them to a texture and then draw the texture to screen. I used this <a href="http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/FrameBufferObjectActivity.html" rel="nofollow">example</a> and ported it across to native excluding the depth buffer.</p> <p>Here's the code:</p> <p>Java:</p> <pre><code>public class NativeRenderer implements Renderer { static { System.loadLibrary("Test"); } private static native void init(); private static native void setTexture(byte[] data, int width, int height); private static native void resize(int width, int height); private static native void render(); private Context mContext; public NativeRenderer(Context context) { mContext = context; } public void onDrawFrame(GL10 gl) { render(); } public void onSurfaceChanged(GL10 gl, int width, int height) { resize(width, height); } public void onSurfaceCreated(GL10 gl, EGLConfig config) { init(); ByteBuffer data; BitmapFactory.Options opts = new BitmapFactory.Options(); opts.inPreferredConfig = Bitmap.Config.ARGB_8888; //ARGB_888 is the default opts.inDensity = 240; // this needed so my images are 512x512 (power of 2) opts.inScaled = false; // someone suggested to add this Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.image, opts); int width = bitmap.getWidth(); int height = bitmap.getHeight(); data = ByteBuffer.allocate(width * height * 4); Log.i(TAG, "allocate:" + (width * height * 4)); data.order(ByteOrder.nativeOrder()); bitmap.copyPixelsToBuffer(data); data.position(0); bitmap.recycle(); Log.i(TAG, "data.hasArray():" + data.hasArray()); setTexture(data.array(), width, height); } } </code></pre> <p>C++:</p> <pre><code>#include "your_company_NativeRenderer.h" #include &lt;android/log.h&gt; #include &lt;GLES/gl.h&gt; #include &lt;GLES/glext.h&gt; #include &lt;string.h&gt; #include "Functions.h" static GLuint texture[2]; static GLuint framebuffer; static GLuint renderbuffer; static GLuint texturebuffer; static int textureWidth; static int textureHeight; static int sWidth; static int sHeight; static float hheight; void viewportFramebuffer() { glViewport(0, 0, textureWidth, textureHeight); glMatrixMode(GL_PROJECTION); glLoadIdentity(); static float viewportFramebufferRight = 160.0f + (320.0 / (float)sWidth) * (textureWidth - sWidth); static float viewportFramebufferTop = hheight + ((2 * hheight) / (float)sHeight) * (textureHeight - sHeight); glOrthof(-160.0f, viewportFramebufferRight, -hheight, viewportFramebufferTop, -1.0f, 1.0f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } void viewportSurface() { glViewport(0, 0, sWidth, sHeight); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrthof(-160.0f, 160.0f, -hheight, hheight, -1.0f, 1.0f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } JNIEXPORT void JNICALL Java_your_company_NativeRenderer_init (JNIEnv *env, jclass obj) { __android_log_print(ANDROID_LOG_INFO, TAG, "init()"); glGenFramebuffersOES(1, &amp;framebuffer); glBindFramebufferOES(GL_FRAMEBUFFER_OES, framebuffer); glEnable(GL_TEXTURE_2D); //glEnable(GL_BLEND); glGenTextures(2, texture); texturebuffer = texture[0]; } JNIEXPORT void JNICALL Java_your_company_NativeRenderer_setTexture (JNIEnv *env, jclass obj, jbyteArray array, jint width, jint height) { __android_log_print(ANDROID_LOG_INFO, TAG, "setTexture()"); void *image = env-&gt;GetPrimitiveArrayCritical(array, 0); unsigned int *imageData = static_cast&lt;unsigned int *&gt;(image); flipImageVertically(imageData, width, height); // flips the bytes vertically glBindTexture(GL_TEXTURE_2D, texture[1]); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image); env-&gt;ReleasePrimitiveArrayCritical(array, image, 0); } JNIEXPORT void JNICALL Java_your_company_NativeRenderer_resize (JNIEnv *env, jclass obj, jint width, jint height) { __android_log_print(ANDROID_LOG_INFO, TAG, "resize(width:%d, height:%d)", width, height); sWidth = width; sHeight = height; hheight = 240.0f + additionToScalePlane(width, height); // used to adjust the spect ratio // iPhone is 2 : 3, my Galaxy S is 5 : 3 __android_log_print(ANDROID_LOG_INFO, TAG, "hheight:%g", hheight); textureWidth = powerOf2Bigger(width); textureHeight = powerOf2Bigger(height); __android_log_print(ANDROID_LOG_INFO, TAG, "texture:{w:%d, h:%d}", textureWidth, textureHeight); glBindTexture(GL_TEXTURE_2D, texturebuffer); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glColor4ub(0, 0, 0, 255); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, textureWidth, textureHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL); int area[] = {0.0, 0.0, sWidth, sHeight}; // using draw_texture extension glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES, area); glBindFramebufferOES(GL_FRAMEBUFFER_OES, framebuffer); glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, texturebuffer, 0); int status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES); if(status != GL_FRAMEBUFFER_COMPLETE_OES) __android_log_print(ANDROID_LOG_ERROR, TAG, "Framebuffer is not complete: %x", status); glBindFramebufferOES(GL_FRAMEBUFFER_OES, framebuffer); } JNIEXPORT void JNICALL Java_your_company_NativeRenderer_render (JNIEnv *env, jclass obj) { static float texCoord[] = { 0.0, 0.0, 0.0, 480.0/512.0, 320.0/512.0, 0.0, 320.0/512.0, 480.0/512.0, }; static float vertex[] = { -160.0, -240.0, -160.0, 240.0, 160.0, -240.0, 160.0, 240.0, }; //off-screen viewportFramebuffer(); glBindFramebufferOES(GL_FRAMEBUFFER_OES, framebuffer); glClearColor(1.0, 0.0, 0.0, 1.0); glClear(GL_COLOR_BUFFER_BIT); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glBindTexture(GL_TEXTURE_2D, texture[1]); glVertexPointer(2, GL_FLOAT, 0, vertex); glTexCoordPointer(2, GL_FLOAT, 0, texCoord); glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); glDisableClientState(GL_VERTEX_ARRAY); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0); //on-screen viewportSurface(); glClearColor(0.0, 0.0, 1.0, 1.0); glClear(GL_COLOR_BUFFER_BIT); /*static float textureCoord[] = { 0.0, 0.0, 0.0, sHeight/(float)textureHeight, sWidth/(float)textureWidth, 0.0, sWidth/(float)textureWidth, sHeight/(float)textureHeight, }; static float textureVertex[] = { -160.0, -hheight, -160.0, hheight, 160.0, -hheight, 160.0, hheight, };*/ //if there isn't draw_texture extension glBindTexture(GL_TEXTURE_2D, texturebuffer); glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE, GL_REPLACE); glActiveTexture(GL_TEXTURE0); glDrawTexiOES(0, 0, 0, sWidth, sHeight); //glVertexPointer(2, GL_FLOAT, 0, textureVertex); //glTexCoordPointer(2, GL_FLOAT, 0, textureCoord); //glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); //glDisableClientState(GL_VERTEX_ARRAY); //glDisableClientState(GL_TEXTURE_COORD_ARRAY); glBindTexture(GL_TEXTURE_2D, 0); } </code></pre>
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