opengl-es

问题 I'm using opengl ES 2.0 I'm using a framebuffer linked to a texture to compile an offscreen render (of some simplistic metaballs), and then I'm rendering that texture to the main back buffer. Everything is looking great except that the texture appears clipped, ie. it is not the full window dimensions (short of about 128 pixels on one axis). Here's a screenshot: http://tinypic.com/r/9telwg/7 Any ideas what could cause this? I read here to set glViewport to the size of the texture, but that

问题 I'm writing an iPhone application which uses UIView with a CAEAGLayer as its layer. Everything is fine and working apart from 1 small problem: sometimes it crashes with EXC_BAD_ACCESS and the following stack trace: [EAGLView draw] glDrawArrays_Exec PrepareToDraw DrawFramebufferMakeResident AttachmentMakeResident TextureMakeResident memmove it crashes on the line: glVertexPointer(3, GL_FLOAT, 0, vertexCoordinates); glTexCoordPointer(2, GL_FLOAT, 0, textureCoordinates); glBindTexture(GL_TEXTURE

问题 I'm generating my VBO with this code int SCREEN_WIDTH = 800; int SCREEN_HEIGHT = 480; int PIXEL_PER_VERTEX = 4; int CAVERN_TEXTURE_WIDTH = 1024; int CAVERN_TEXTURE_HEIGHT = 512; final int vertexCount = ((SCREEN_WIDTH / PIXEL_PER_VERTEX) +1 ) * 2; final float[] bufferDataLowerCave = new float[vertexCount * CavernBoundMesh.VERTEX_SIZE]; for(int i=0; i < vertexCount; i += 2) { bufferDataLowerCave[i * CavernBoundMesh.VERTEX_SIZE + CavernBoundMesh.VERTEX_INDEX_X] = PIXEL_PER_VERTEX * i / 2.f;

问题 I'm generating my VBO with this code int SCREEN_WIDTH = 800; int SCREEN_HEIGHT = 480; int PIXEL_PER_VERTEX = 4; int CAVERN_TEXTURE_WIDTH = 1024; int CAVERN_TEXTURE_HEIGHT = 512; final int vertexCount = ((SCREEN_WIDTH / PIXEL_PER_VERTEX) +1 ) * 2; final float[] bufferDataLowerCave = new float[vertexCount * CavernBoundMesh.VERTEX_SIZE]; for(int i=0; i < vertexCount; i += 2) { bufferDataLowerCave[i * CavernBoundMesh.VERTEX_SIZE + CavernBoundMesh.VERTEX_INDEX_X] = PIXEL_PER_VERTEX * i / 2.f;

问题 I'm trying to load textures to use with NDK OpenGL from Java with the Bitmap class. It works, but I'm having problems with the pixel format. First, in Java, I load a bitmap from the assets folder like this: Bitmap bitmap = BitmapFactory.decodeStream(amgr.open(path)); return bitmap.copy(Bitmap.Config.ARGB_8888, false); the bitmap config does not have an option for RGBA channel order. [JNI things happen here] Using GLES 1, I then buffer the texture like so: glTexImage2D(GL_TEXTURE_2D, 0, GL

问题 I'm trying to load textures to use with NDK OpenGL from Java with the Bitmap class. It works, but I'm having problems with the pixel format. First, in Java, I load a bitmap from the assets folder like this: Bitmap bitmap = BitmapFactory.decodeStream(amgr.open(path)); return bitmap.copy(Bitmap.Config.ARGB_8888, false); the bitmap config does not have an option for RGBA channel order. [JNI things happen here] Using GLES 1, I then buffer the texture like so: glTexImage2D(GL_TEXTURE_2D, 0, GL

问题 I can't seem to find the glGenBuffer function in Qt5, my include list looks like #include <QtOpenGL/qgl.h> #include <QtOpenGL/qglbuffer.h> #include <QtOpenGL/qglcolormap.h> #include <QtOpenGL/qglframebufferobject.h> #include <QtOpenGL/qglfunctions.h> #include <QtOpenGL/qglpixelbuffer.h> #include <QtOpenGL/qglshaderprogram.h> #include <GL/GLU.h> I am trying to do something like the following example: http://qt-project.org/doc/qt-5.0/qtopengl/cube.html Where is it? 回答1: I know I'm late, but

问题 I have written a simple program that renders a sphere in a 3d environment and colores it according to four light sources around the sphere. When I run the program on the desktop it works just fine but on an Android device the sphere is just plain colored. Here are images to illustrate what I am talking about: -> Desktop -> Android And here is the shader code: sphere.vert #ifdef GL_ES precision mediump float; #endif uniform mat4 u_projectionMatrix; uniform mat3 u_normalMatrix; uniform mat4 u

问题 Right now I'm populating a UIScrollView with a series of views. The views need to be warped to make the UIScrollView appear like a carousel. In other words when the user scrolls it needs to be like a circle. I've never done anything quite like this before, but I'm assuming CoreAnimation is out of the question and OpenGL needs to be used. If this is possible with CoreAnimation or Quartz then I really just need a sample on how to warp the views and I can figure the rest out myself but I'm not

问题 I've got a vector tileset on Mapbox that I created by uploading a geojson file comprising polygons representing particular suburbs in Victoria, Australia. My vector tileset has three properties - suburb, state, postcode - corresponding to the feature properties in the geojson. I can also successfully query those properties via the Mapbox web gl js library to get an accurate map. For example I've got a map working that shows a popup when I click a highlighted polygon, and the popup correctly