ogl_dot3_bump_mapping.zip_bump_bump map_bump mapping_mapping

//----------------------------------------------------------------------------- // Name: ogl_dot3_bump_mapping.cpp // Author: Kevin Harris (kevin@codesampler.com) // Last Modified: 03/30/05 // Description: This sample demonstrates how to perform Dot3 per-pixel bump // mapping using a normal map and the GL_DOT3_RGB_EXT // texture-blending operation. This technique is sometimes // referred to as per-pixel lighting or per-pixel attenuation, // but Dot3 per-pixel bump-mapping is what most programmers // know it as. // // This sample also demonstrates how to create tangent, // binormal, and normal vectors, for each vertex of our test // geometry (a simple cube). These vectors are used during // rendering to define an inverse tangent matrix for each // vertex. This has to be done because a normal-map stores its // normals in tangent-space. Therefore, we need an inverse // tangent matrix so we can transform our scene's light vector // from object-space into tangent-space. Once transformed, we // then encode this new light vector as a RGB color and pass // it into the texture blending stage as the vertex's Diffuse // color. // // Additional Notes: // // The phrase "Dot3" comes form the mathematical operation that // combines a light vector with a surface normal. // // The phrase "Per-pixel" comes from the fact that for every // pixel in the base texture map, we store a unique surface // normal to light it. These surface normals are passed into the // texture blending stage via a normal-map. A normal-map is a // texture where normals (x,y,z) have been encoded and stored // as (r,g,b). // // Control Keys: d/D - Toggle Dot3 bump mapping // l/L - Toggle the usage of regular lighting in addition // to the per-pixel lighting effect of bump mapping. // m/M - Toggle motion of point light // Up Arrow - Move the test cube closer // Down Arrow - Move the test cube away //----------------------------------------------------------------------------- #define STRICT #define WIN32_LEAN_AND_MEAN #include <windows.h> #include <mmsystem.h> // Do this to access M_PI, which is not officially part of the C/C++ standard. #define _USE_MATH_DEFINES #include <math.h> #include <stdlib.h> #include <GL/gl.h> #include <GL/glu.h> #include <GL/glaux.h> #include "geometry.h" #include "matrix4x4f.h" #include "vector3f.h" #include "resource.h" //----------------------------------------------------------------------------- // FUNCTION POINTERS FOR OPENGL EXTENSIONS //----------------------------------------------------------------------------- // For convenience, this project ships with its own "glext.h" extension header // file. If you have trouble running this sample, it may be that this "glext.h" // file is defining something that your hardware doesn�t actually support. // Try recompiling the sample using your own local, vendor-specific "glext.h" // header file. #include "glext.h" // Sample's header file //#include <GL/glext.h> // Your local header file PFNGLACTIVETEXTUREPROC glActiveTexture = NULL; PFNGLMULTITEXCOORD2FPROC glMultiTexCoord2f = NULL; PFNGLCLIENTACTIVETEXTUREPROC glClientActiveTexture = NULL; //----------------------------------------------------------------------------- // GLOBALS //----------------------------------------------------------------------------- HDC g_hDC = NULL; HGLRC g_hRC = NULL; HWND g_hWnd = NULL; GLuint g_textureID = -1; GLuint g_normalmapTextureID = -1; bool g_bDoDot3BumpMapping = true; bool g_bMoveLightAbout = true; bool g_bToggleRegularLighting = false; GLfloat g_lightPosition[] = { 0.0f, 0.0f, 0.0f, 1.0f }; // Point Light's position float g_fDistance = -5.0f; float g_fSpinX = 0.0f; float g_fSpinY = 0.0f; float g_fElpasedTime; double g_dCurTime; double g_dLastTime; struct Vertex { float tu, tv; float r, g, b, a; float nx, ny, nz; float x, y, z; }; const int NUM_VERTICES = 24; Vertex g_cubeVertices[NUM_VERTICES] = { // tu tv r g b a nx ny nz x y z // Front face { 0.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 0.0f, 1.0f, -1.0f,-1.0f, 1.0f }, { 1.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 0.0f, 1.0f, 1.0f,-1.0f, 1.0f }, { 1.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f }, { 0.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 0.0f, 1.0f, -1.0f, 1.0f, 1.0f }, // Back face { 1.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 0.0f,-1.0f, -1.0f,-1.0f,-1.0f }, { 1.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 0.0f,-1.0f, -1.0f, 1.0f,-1.0f }, { 0.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 0.0f,-1.0f, 1.0f, 1.0f,-1.0f }, { 0.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 0.0f,-1.0f, 1.0f,-1.0f,-1.0f }, // Top face { 0.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 1.0f, 0.0f, -1.0f, 1.0f,-1.0f }, { 0.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 1.0f, 0.0f, -1.0f, 1.0f, 1.0f }, { 1.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f }, { 1.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f,-1.0f }, // Bottom face { 1.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f,-1.0f, 0.0f, -1.0f,-1.0f,-1.0f }, { 0.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f,-1.0f, 0.0f, 1.0f,-1.0f,-1.0f }, { 0.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f,-1.0f, 0.0f, 1.0f,-1.0f, 1.0f }, { 1.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, 0.0f,-1.0f, 0.0f, -1.0f,-1.0f, 1.0f }, // Right face { 1.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, 1.0f, 0.0f, 0.0f, 1.0f,-1.0f,-1.0f }, { 1.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f,-1.0f }, { 0.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f }, { 0.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, 1.0f, 0.0f, 0.0f, 1.0f,-1.0f, 1.0f }, // Left face { 0.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, -1.0f, 0.0f, 0.0f, -1.0f,-1.0f,-1.0f }, { 1.0f,0.0f, 1.0f,1.0f,1.0f,1.0f, -1.0f, 0.0f, 0.0f, -1.0f,-1.0f, 1.0f }, { 1.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f }, { 0.0f,1.0f, 1.0f,1.0f,1.0f,1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f,-1.0f } }; // For each vertex defined above, we'll need to create a Tangent, BiNormal, and // Normal vector, which together define a tangent matrix for Dot3 bump mapping. vector3f g_vTangents[NUM_VERTICES]; vector3f g_vBiNormals[NUM_VERTICES]; vector3f g_vNormals[NUM_VERTICES]; //----------------------------------------------------------------------------- // PROTOTYPES //----------------------------------------------------------------------------- int WINAPI WinMain(HINSTANCE g_hInstance,HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow); LRESULT CALLBACK WindowProc(HWND g_hWnd, UINT msg, WPARAM wParam, LPARAM lParam); void loadTexture(void); void init(void); void render(void); void shutDown(void); vector3f scaleAndBiasVectorAsRGBColor(vector3f* vVector); void computeTangentsMatricesForEachVertex(void); void createTangentSpaceVectors( vector3f *v1, vector3f *v2, vector3f *v3, float v1u, float v1v, float v2u, float v2v, float v3u, float v3v, vector3f *vTangent, vector3f *vBiNormal, vector3f *vNormal ); //----------------------------------------------------------------------------- // Name: WinMain() // Desc: The application's entry point //----------------------------