OpenGL path (8) add illumination effects and keyboard control

Add the illumination effect to OpenGL and use a keyboard to zoom in or out.

W key zoom in s key zoom out d key switch light

The preview effect is as follows:

The source code is as follows:

# Include <Gl/glut. h> # include <Gl/Glaux. h> # include <stdio. h> # pragma comment (Lib, "opengl32.lib") # pragma comment (Lib, "glu32.lib") # pragma comment (Lib, "glu32.lib") # pragma comment (Lib, "glut. lib ") # pragma comment (Lib," Glaux. lib ") uint g_bmp [1]; // texture No. glfloat lightambient [] = {1.5f, 1.5f, 1.5f, 1.0f}; // environment light parameter, semi-bright white glfloat lightdiffuse [] = {1.0f, 1.0f, 1.0f, 1.0f}; // diffuse light parameter, glfloat lightposition [] = {0.0f, 0.0f, 0.0f, 1.0f}; // void box (float X, float y, float Z) // cube {glpushmatrix (); glscalef (x, y, z); glable (gl_texture_2d); // glbegin (gl_quads); gltexcoord2f (0.0f, 0.0f); glvertex3f (-1.0f,-1.0f, 1.0f ); // frontend vertex (1.0f, 0.0f); glvertex3f (1.0f,-1.0f, 1.0f); gltexcoord2f (1.0f, 1.0f); glvertex3f (1.0f, 1.0f, 1.0f); vertex (0.0f, 1.0f); glvertex3f (-1.0f, 1.0f, 1.0f); gltexcoord2f (1.0 F, 0.0f); glvertex3f (-1.0f,-1.0f,-1.0f); // post gltexcoord2f (1.0f, 1.0f); glvertex3f (-1.0f, 1.0f,-1.0f ); random (0.0f, 1.0f); glvertex3f (1.0f, 1.0f,-1.0f); random (0.0f, 0.0f); glvertex3f (1.0f,-1.0f,-1.0f); gltexcoord2f (0.0f, 1.0f); glvertex3f (-1.0f, 1.0f,-1.0f); // gltexcoord2f (0.0f, 0.0f); glvertex3f (-1.0f, 1.0f, 1.0f); gltexcoord2f (1.0f, 1.0f, 0.0f); glvertex3f (1.0f, 1.0f, 1.0f); gltexcoord2f (1.0f, 1.0f); glvertex3f (1.0f, 1.0f,-1.0f); gltexcoord2f (1.0f, 1.0f); glvertex3f (-1.0f,-1.0f,-1.0f ); // gltexcoord2f (0.0f, 1.0f); glvertex3f (1.0f,-1.0f,-1.0f); gltexcoord2f (0.0f, 0.0f); glvertex3f (1.0f,-1.0f, 1.0f ); gltexcoord2f (1.0f, 0.0f); glvertex3f (-1.0f,-1.0f, 1.0f); gltexcoord2f (1.0f, 0.0f); glvertex3f (1.0f,-1.0f,-1.0f ); // left gltexcoord2f (1.0f, 1.0f); glvertex3f (1.0f, 1.0f,-1.0f); gltexco Ord2f (0.0f, 1.0f); glvertex3f (1.0f, 1.0f, 1.0f); then (0.0f, 0.0f); glvertex3f (1.0f,-1.0f, 1.0f); then (0.0f, 0.0f ); glvertex3f (-1.0f,-1.0f,-1.0f); // right gltexcoord2f (1.0f, 0.0f); glvertex3f (-1.0f,-1.0f, 1.0f); gltexcoord2f (1.0f, 1.0f ); glvertex3f (-1.0f, 1.0f, 1.0f); gltexcoord2f (0.0f, 1.0f); glvertex3f (-1.0f, 1.0f,-1.0f); glend (); gldisable (gl_texture_2d ); // cancel the glpopmatrix ();} bool loadt Exture (char * filename, gluint & texture) {aux_rgbimagerec * pimage = auxdibimageloada (filename); // load bitmap if (pimage = NULL) return false; glgentextures (1, & texture); // generate the texture glbindtexture (gl_texture_2d, g_bmp [0]); // apply the texture glubuild2dmipmaps (outputs, 4, pimage-> sizex, pimage-> sizey, gl_rgb, gl_unsigned_byte, pimage-> data); // map data return true;} void Init () {loadtexture ("I: \ 4.bmp", g_bmp [0]); gllightfv (gl_l Ight1, gl_ambient, lightambient); // sets the environment light gllightfv (gl_light1, gl_diffuse, lightdiffuse); // sets the diffuse light gllightfv (gl_light1, gl_position, lightposition ); // set the position of the light source to gl_light1; // enable the 1 light source to gl_lighting; // open light} float S = 1, r = 0; // zoom in and out multiple and rotate the parameter void renderscene (void) {glclear (gl_color_buffer_bit | gl_depth_buffer_bit); // clear the screen and the depth bufferglloadidentity (); // reset the viewgltrans Latef (0.0f, 0.0f,-5); glrotatef (R, 1.0f, 1.0f, 0.0f); glscalef (S, S, S); box (1, 1, 1 ); R + = 0.01; // rotate fig ();} void changesize (int w, int h) {If (H = 0) H = 1; float ratio = 1.0 * W/H; glmatrixmode (gl_projection); // unitized projection matrix. Glloadidentity (); glviewport (0, 0, W, H); // you can specify the window size as gluperspective (45, ratio, 1, 1000 ); // set the correct projection matrix glmatrixmode (gl_modelview); // set the Model View matrix glloadidentity (); glulookat (0.0, 0.0, 5.0, 0.0, 0.0,-1.0, 0.0f, 1.0f, 0.0f); // set the observation point} int light = 1, BP = 0; void keyfunc (unsigned char CH, int X, int y) {If (CH = 'W') // The sending size is reduced by S + = 0.1; else if (CH = 's') S-= 0.1; if (CH = 'D') // d key switch light {If (light) {Light = 0; gldisable (gl_lighting); printf ("off \ n ");} else {Light = 1; glable (gl_lighting); printf ("On \ n") ;}} int main (INT argc, char * argv []) {gluinit (& argc, argv); gluinitdisplaymode (glu_depth | glu_double | glu_rgba); gluinitwindowposition (100,100); gluinitwindowsize (320,320); glucreatewindow ("Hello OpenGL"); Init (); gludisplayfunc (renderscene); glutidlefunc (renderscene); // call the function glureshapefunc (changesize) when the program is idle; // specify the gl_depth_test callback function when the window shape changes ); glukeyboardfunc (keyfunc); // The keyboard callback function: glumainloop (); Return 0 ;}

The textures used are as follows:

OpenGL path (8) add illumination effects and keyboard control