opengl-es

问题 I'm using min3D library in my project to visualize a 3D model. This library is based in openGL. For this, I defined a renderer which manages the GLSurfaceView. At this moment, I see the 3D model in my app, but the background of the surface view is black, and my goal is to make it transparent, this way I would only see the 3D model without the black background. The min3D library examples, as other SO questions and info I've readed about this, tell that the way to achieve this is by doing this:

问题 While trying to execute a program based on C++ in android via NDK platform, the compilation is giving error that 'gl.h' and 'glext.h' header files are not found, as I have included both of them in my C++ code. M using android-ndk-r8 and compiling it with Cygwin. here s my code: **ANDROID.MK** LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := NDK1 FILE_LIST := $(wildcard $(LOCAL_PATH)/*.cpp) LOCAL_SRC_FILES := $(FILE_LIST:$(LOCAL_PATH)/%=%) include $(BUILD_SHARED_LIBRARY) ---

问题 Is it possible to use color pallettes in openGL ES 1.1? I'm currently developing a game which has player sprites, and the player sprites need to be able to be changed to different teams' colors. For example, changing the shirts' colors but not the face colors, which rules out simple hue rotation. Is this possible, or will this have to be implemented manually (modifying the texture data directly)? 回答1: It's not a hardware feature of the MBX but a quick check of gl.h for ES 1.x from the iPhone

问题 I am trying to draw a rectangle using the GLPaint example project provided by apple. I have tried modifying the vertices but cannot get a rectangle to appear on the screen. The finger painting works perfectly. Am I missing something in my renderRect method? - (void)renderRect { [EAGLContext setCurrentContext:context]; glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer); // Replace the implementation of this method to do your own custom drawing. static const GLfloat squareVertices[] = {

问题 I'm trying to render some particle effects in Android using OpenGL. Each particle will be a billboarded textured quad and each particle is rendered with a rotation (i.e. around the z axis). I'm restricted to using OpenGL ES 1.1 so point sprites and pixel shaders aren't an option. What is a fast way of rendering and updating the positions of many particles (e.g. 100 to 5000)? I know that using an OpenGL draw call for each particle is going to be very slow but I'm confused at how to use things

问题 Am working in a simple iPhone game application using OpenGLES framework. I facing an "EXC Bad Access" error while draw a line on the images . Here i will explain you what i did and what i tried in my project. Step:1 I draw a Background Image used GL_TRIANGLE_STRIP . Here is my sample code, - (void)viewDidLoad { [super viewDidLoad]; self.context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2]; Test = NO; Test1 = NO; if (!self.context) { NSLog(@"Failed to create ES context"); }

问题 I'm using [NSString drawInRect:] to draw text to a texture and everything works fine until I add drop shadows. They appear correctly, but are often clipped by the rect I'm drawing to. The issue is that [NSString sizeWithFont:] doesn't know about the drop shadows since they are applied via CGContextSetShadowWithColor(...) . Here is the code I'm using (fluff removed): CGSize dim = [theString sizeWithFont:uifont]; ... CGContextSetRGBFillColor(context, 1.0f, 1.0f, 1.0f, 1.0f);

问题 I am developing a 2D Open GL game and i have to draw many squares on screen for a tilemap, with a diferent glTexCoordPointer from the texture. Now, I don't know how to use Gldrawelements for draw many squares, which would be the structure of the indices if I want to draw many squares? And, how can I put each array (vertices), which contains the coordinates of each square on the vertexbuffer ? Also, will it be possible to set different glTexCoordPointer for each square in just one call to the

问题 Currently i am working in ball game app using OpenGLES in iphone, Using GL_TRIANGLE_STRIP to draw ball and movement action from left to right, then GL_LINES to draw a line, but the line cannot draw inside the ball movement, how to solve this? I tried the sample code: #1 - (void)update { self.timeSinceLastSpawn += self.timeSinceLastUpdate; self.timeSinceLastSpawn = 0; if (self.timeSinceLastSpawn > 2.0) { [self target]; // Call the Method target } for (SGGSprite * sprite in self.children) /

问题 I'm writing a particle system that uses point sprites in OpenGL ES 1.1 on iOS. Everything works great until I try to texture the point sprites... when I render, each sprite is colored by the top left pixel of the texture I'm loading (rather than displaying the image). I've tried different images and different sizes and always get the same result. setup code (taken from GLPaint example): CGImageRef brushImage; CGContextRef brushContext; size_t width, height; GLubyte *brushData; brushImage =