glut

问题 can somebody explain how does glutMainLoop work? and second question, why glClearColor(0.0f, 0.0f, 1.0f, 1.0f); defined after glutDisplayFunc(RenderScene); cause firstly we call glClear(GL_COLOR_BUFFER_BIT); and only then define glClearColor(0.0f, 0.0f, 1.0f, 1.0f); int main(int argc, char* argv[]) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); glutInitWindowSize(800, 00); glutInitWindowPosition(300,50); glutCreateWindow("GLRect"); glutDisplayFunc(RenderScene);

问题 I am trying to build the hello.c example from http://www.glprogramming.com/red/chapter01.html (look for "Example 1-2"). My CMakeLists.txt is as follows: cmake_minimum_required (VERSION 2.8) project (GLUTEX) find_package(OpenGL REQUIRED) find_package(GLUT REQUIRED) include_directories(${GLUT_INCLUDE_DIRS}) include_directories(${OpenGL_INCLUDE_DIRS}) add_executable (glutex glutex.c) target_link_libraries (glutex ${OpenGL_LIBRARIES}) target_link_libraries (glutex ${GLUT_LIBRARIES}) The CMake

问题 I've been trying to compile glut as a static library without having to link with glut32.dll on runtime. I downloaded the glut windows source code but when I try to compile (default), I keep getting: Making in glut subdirectory... link /INCREMENTAL:NO /NOLOGO -entry:_DllMainCRTStartup@12 -dll -out:glut32.dll -def:glut.def glut_8x13.obj glut_9x15.obj glut_bitmap.obj glut_bwidth.obj glut_cindex.obj glut_cmap.obj glut_cu rsor.obj glut_dials.obj glut_dstr.obj glut_event.obj glut_ext.obj glut

问题 Code is here: void readOIIOImage( const char* fname, float* img) { int xres, yres; ImageInput *in = ImageInput::create (fname); if (! in) {return;} ImageSpec spec; in->open (fname, spec); xres = spec.width; yres = spec.height; iwidth = spec.width; iheight = spec.height; channels = spec.nchannels; cout << "\n"; pixels = new float[xres*yres*channels]; in->read_image (TypeDesc::FLOAT, pixels); long index = 0; for( int j=0;j<yres;j++) { for( int i=0;i<xres;i++ ) { for( int c=0;c<channels;c++ ) {

问题 I've made the following code: #include <math.h> #include <GL/gl.h> #include <GL/glu.h> #include <GL/glut.h> #define WIDTH 400 #define HEIGTH 400 #define ORIGIN_X 50 #define ORIGIN_Y 50 #define move(x,y) glTranslatef(x, y, 0.0f); #define enlarge(y) glScalef(1, y, 1); #define rotateX(angle) glRotatef(angle, 1,0,0); #define rotateY(angle) glRotatef(angle, 0,1,0); #define rotateZ(angle) glRotatef(angle, 0,0,1); // Variables que definen la rotación del brazo entero (de hombro a mano) static

问题 Porting over a chapter 7 example of instanced rendering from Superbible OpenGL 7th ed. and run into a problem with the function glBufferSubData Whatever I do to it, it won't accept the data. Make it into a pointer, a byte string, list itself. Please help any assistance would be very much appreciated. Thank You. Update: Using the excellent answer from Rabbid76 the function glBufferSubData is now accepting the data and the numpy version is very nice, the ctypes version is an insightful answer

问题 Porting over a chapter 7 example of instanced rendering from Superbible OpenGL 7th ed. and run into a problem with the function glBufferSubData Whatever I do to it, it won't accept the data. Make it into a pointer, a byte string, list itself. Please help any assistance would be very much appreciated. Thank You. Update: Using the excellent answer from Rabbid76 the function glBufferSubData is now accepting the data and the numpy version is very nice, the ctypes version is an insightful answer

问题 When you make a window in glut using glutCreateWindow it puts a top to the window? What if I want to do some OpenGL rendering without a window top? This probably doesn't make much sense without a picture: Essentially I want to remove this from the window. 回答1: The proper terminology for what you want is "undecorated window" or "borderless window". Unfortunately, I can't find any GLUT calls which let you control window decorations. The closest I was able to find was glutFullScreen which, on

问题 I'm trying to display the text in my application using freetype. At first I thought that this built-in function (which would be quite natural for the library intended to draw the text). But there was only a function to display the symbol.Then I decided to take the characters one by one into a texture. But here again I was disappointed: all guides one texture uses a single image (probably glTexSubImage2D can help me?).Now I put a symbol on the texture and texture to opengl element.Here's my

问题 I am trying to move an image around in openGL while holding left mouse button. i am NOT trying to drag an object around, just move the whole picture. Its a 2d drawing of a fractal and i was told that i can use gluortho2d but i can't find any info or similar tries on how to do it. I am assuming something like void mouse_callback_func(int button, int state, int x, int y) { if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) gluOrtho2D(x-250.0, x+250.0, y-250.0,y+250.); glutPostRedisplay(); }