/* 21_bump_map_wall.c - OpenGL-based bump mapping example using Cg programs from Chapter 8 of "The Cg Tutorial" (Addison-Wesley, ISBN 0321194969). */ /* Requires the OpenGL Utility Toolkit (GLUT) and Cg runtime (version 1.5 or higher). */ #include <stdio.h> /* for printf and NULL */ #include <stdlib.h> /* for exit */ #include <math.h> /* for sqrt, sin, and cos */ #include <assert.h> /* for assert */ #include <GL/glew.h> #ifdef __APPLE__ #include <GLUT/glut.h> #else #include <GL/glut.h> #endif #ifdef _WIN32 #include <GL/wglew.h> #else #ifdef __APPLE__ #include <OpenGL/OpenGL.h> #else #include <GL/glxew.h> #endif #endif #include <Cg/cg.h> /* Can't include this? Is Cg Toolkit installed! */ #include <Cg/cgGL.h> static CGcontext myCgContext; static CGprofile myCgVertexProfile, myCgFragmentProfile; static CGprogram myCgVertexProgram, myCgFragmentProgram; static CGparameter myCgVertexParam_lightPosition, myCgVertexParam_modelViewProj, myCgFragmentParam_normalMap, myCgFragmentParam_normalizeCube; static const char *myProgramName = "21_bump_map_wall", *myVertexProgramFileName = "C8E1v_bumpWall.cg", /* page 205 */ *myVertexProgramName = "C8E1v_bumpWall", *myFragmentProgramFileName = "C8E2f_bumpSurf.cg", /* page 206 */ *myFragmentProgramName = "C8E2f_bumpSurf"; static float myLightAngle = 4.0; /* Angle light rotates around scene. */ /* OpenGL texture object (TO) handles. */ enum { TO_NORMALIZE_VECTOR_CUBE_MAP = 0, TO_NORMAL_MAP = 1, }; GLuint texObj[2]; static const GLubyte myBrickNormalMapImage[3*(128*128+64*64+32*32+16*16+8*8+4*4+2*2+1*1)] = { /* RGB8 image data for a mipmapped 128x128 normal map for a brick pattern */ #include "brick_image.h" }; static const GLubyte myNormalizeVectorCubeMapImage[6*3*32*32] = { /* RGB8 image data for a normalization vector cube map with 32x32 faces */ #include "normcm_image.h" }; static void checkForCgError(const char *situation) { CGerror error; const char *string = cgGetLastErrorString(&error); if (error != CG_NO_ERROR) { printf("%s: %s: %s\n", myProgramName, situation, string); if (error == CG_COMPILER_ERROR) { printf("%s\n", cgGetLastListing(myCgContext)); } exit(1); } } /* Forward declared GLUT callbacks registered by main. */ static void display(void); static void keyboard(unsigned char c, int x, int y); static void menu(int item); static void reshape(int width, int height); /* Other forward declared functions. */ static void requestSynchronizedSwapBuffers(void); int main(int argc, char **argv) { const GLubyte *image; unsigned int size, level; int face; glutInitWindowSize(400, 400); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); glutInit(&argc, argv); glutCreateWindow(myProgramName); glutDisplayFunc(display); glutKeyboardFunc(keyboard); glutReshapeFunc(reshape); /* Initialize OpenGL entry points. */ if (glewInit()!=GLEW_OK || !GLEW_VERSION_1_3) { fprintf(stderr, "%s: failed to initialize GLEW, OpenGL 1.3 required.\n", myProgramName); exit(1); } requestSynchronizedSwapBuffers(); glClearColor(0.1, 0.3, 0.6, 0.0); /* Blue background */ glEnable(GL_DEPTH_TEST); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); /* Tightly packed texture data. */ glGenTextures( 2, texObj ); glBindTexture(GL_TEXTURE_2D, texObj[TO_NORMAL_MAP]); /* Load each mipmap level of range-compressed 128x128 brick normal map texture. */ for (size = 128, level = 0, image = myBrickNormalMapImage; size > 0; image += 3*size*size, size /= 2, level++) { glTexImage2D(GL_TEXTURE_2D, level, GL_RGB8, size, size, 0, GL_RGB, GL_UNSIGNED_BYTE, image); } glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); glBindTexture(GL_TEXTURE_CUBE_MAP, texObj[TO_NORMALIZE_VECTOR_CUBE_MAP]); /* Load each 32x32 face (without mipmaps) of range-compressed "normalize vector" cube map. */ for (face = 0, image = myNormalizeVectorCubeMapImage; face < 6; face++, image += 3*32*32) { glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, 0, GL_RGB8, 32, 32, 0, GL_RGB, GL_UNSIGNED_BYTE, image); } glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); myCgContext = cgCreateContext(); checkForCgError("creating context"); cgGLSetDebugMode(CG_FALSE); cgSetParameterSettingMode(myCgContext, CG_DEFERRED_PARAMETER_SETTING); myCgVertexProfile = cgGLGetLatestProfile(CG_GL_VERTEX); cgGLSetOptimalOptions(myCgVertexProfile); checkForCgError("selecting vertex profile"); myCgVertexProgram = cgCreateProgramFromFile( myCgContext, /* Cg runtime context */ CG_SOURCE, /* Program in human-readable form */ myVertexProgramFileName, /* Name of file containing program */ myCgVertexProfile, /* Profile: OpenGL ARB vertex program */ myVertexProgramName, /* Entry function name */ NULL); /* No extra compiler options */ checkForCgError("creating vertex program from file"); cgGLLoadProgram(myCgVertexProgram); checkForCgError("loading vertex program"); myCgVertexParam_lightPosition = cgGetNamedParameter(myCgVertexProgram, "lightPosition"); checkForCgError("could not get lightPosition parameter"); myCgVertexParam_modelViewProj = cgGetNamedParameter(myCgVertexProgram, "modelViewProj"); checkForCgError("could not get modelViewProj parameter"); myCgFragmentProfile = cgGLGetLatestProfile(CG_GL_FRAGMENT); cgGLSetOptimalOptions(myCgFragmentProfile); checkForCgError("selecting fragment profile"); myCgFragmentProgram = cgCreateProgramFromFile( myCgContext, /* Cg runtime context */ CG_SOURCE, /* Program in human-readable form */ myFragmentProgramFileName, /* Name of file containing program */ myCgFragmentProfile, /* Profile: OpenGL ARB vertex program */ myFragmentProgramName, /* Entry function name */ NULL); /* No extra compiler options */ checkForCgError("creating fragment program from file"); cgGLLoadProgram(myCgFragmentProgram); checkForCgError("loading fragment program"); myCgFragmentParam_normalMap = cgGetNamedParameter(myCgFragmentProgram, "normalMap"); checkForCgError("getting normalMap parameter"); myCgFragmentParam_normalizeCube = cgGetNamedParameter(myCgFragmentProgram, "normalizeCube"); checkForCgError("getting normalizeCube parameter"); cgGLSetTextureParameter(myCgFragmentParam_normalMap, texObj[TO_NORMAL_MAP]); checkForCgError("setting normal map 2D texture"); cgGLSetTextureParameter(myCgFragmentParam_normalizeCube, texObj[TO_NORMALIZE_VECTOR_CUBE_MAP]); checkForCgError("setting normalize vector cube map"); glutCreateMenu(menu); glutAddMenuEntry("[ ] Animate", ' '); glutAttachMenu(GLUT_RIGHT_BUTTON); glutMainLoop(); return 0; } static void reshape(int width, int height) { double aspectRatio = (float) width / (float) height; double fieldOfView = 75.0; /* Degrees */ glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(fieldOfView, aspectRatio, 0.1, /* Z near */ 100.0); /* Z far */ glMatrixMode(GL_MODELVIEW); glViewport(0, 0, width, height); } static void display(void) { const float lightPosition[3] = { 12.5*sin(myLightAngle), 12.5*cos(myLightAngle), 4 }; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); gluLookAt( 0.0, 0.0, 20.0, 0.0, 0.0, 0.0, /* XYZ view center */ 0.0, 1.0, 0.0); /* Up is in positive Y direction */ cgGLBindProgram(myCgVertexProgram); checkForCgError("binding vertex program"); cgGLSetStateMatrixParameter(myCgVertexParam_modelViewProj, CG_GL_MODELVIEW_PROJECTION_MATRIX, CG_GL_MATRIX_IDENTITY); checkForCgError("setting modelview-projection matrix"); cgSetParameter3fv(myCgVertexParam_lightPosition, lightPosition); checkForCgError("setting light position"); cgGLEnableProfile(myCgVertexProfile); checkForCgError("enabling vertex profile"); cgGLBindProgram(myCgFragmentProgram); checkForCgError("binding fragment program"); cgGLEnableTextureParameter(myCgFragmentParam_normalMap); checkForCgError("enable texture normal map"); cgGLEnableTextureParameter(myCgFragmentParam_normalizeCube); checkForCgError("enable normalize vector cube map"); cgGLEnableProfile(myCgFragmentProfile); checkForCgError("enabling fragment profile"); cgUpdateProgramParameters(myCgVertexProgram); cgUpdateProgramParameters(myCgFragmentProgram); glBegin(GL_QUADS); /* Counter clockwise (GL_CCW) winding */ glTexCoord2f(0,0); glVertex2f(-7,-7); glTexCoord2f(1,0); glVertex2f( 7,-7); glTexCoord2f(1,1); glVertex2f( 7, 7); glTexCoord2f(0,1); glVertex2f(-7, 7); glEnd(); cgGLDisableProfile(myCgVertexProfile); checkForCgError("disabling vertex profile"); cgGLDisableProfile(myCgFragmentProfile); checkForCgError("disabling fragment profile"); /*** Render light as white ball using fixed function pipe ***/ glTranslatef(lightPosition[0], lightPosition[1], lightPosition[2]); glColor3f(0.8, 0.8, 0.1); /* yellow */ glutSolidSphere(0.4, 12, 12); glutSwapBuffers(); } static const double my2Pi = 2.0 * 3.14159265358979323846; static void idle(void) { myLightAngle += 0.008; /* Add a small angle (in radians). */ if (myLightAngle > my2Pi) { myLightAngle -= my2Pi; } glutPostRedisplay(); } static void keyboard(unsigned char c, int x, int y) { static int animating = 0; switch (c) { case ' ': animating = !animating; /* Toggle */ if (animating) { glutIdleFunc(idle); } else { glutIdleFunc(NULL); } break; case 27: /* Esc key */ /* Demonstrate proper deallocation of Cg runtime data structures. Not strictly necessary if we are simply going to exit. */ cgDestroyProgram(myCgVertexProgram); cgDestroyContext(myCgContext); exit(0); break; } } static void menu(int item) { /* Pass menu item character code to keyboard callback. */ keyboard((unsigned char)item, 0, 0); } /* Platform-specific code to request synchronized buffer swaps. */ static void requestSynchronizedSwapBuffers(void) { #if defined(__APPLE__) #ifdef CGL_VERSION_1_2 const GLint sync = 1; #else const long sync = 1; #endif CGLSetParameter(CGLGetCurrentContext(), kCGLCPSwapInterval, &sync); #elif defined(_WIN32) if (wglSwapIntervalEXT) { wglSwapIntervalEXT(1); } #else if (glXSwapIntervalSGI) { glXSwapIntervalSGI(1); } #endif }