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502 lines
16 KiB
502 lines
16 KiB
/******************************Module*Header*******************************\
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* Module Name: gentex.c
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*
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* The Textured Flag style of the 3D Flying Objects screen saver.
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*
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* Texture maps .BMP files onto a simulation of a flag waving in the breeze.
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*
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* Copyright (c) 1994 Microsoft Corporation
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*
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\**************************************************************************/
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#include <stdlib.h>
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#include <windows.h>
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#include <GL\gl.h>
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#include <GL\glu.h>
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#include <string.h>
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#include <math.h>
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#include "ss3dfo.h"
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static float winTotalwidth = (float)0.75;
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static float winTotalheight = (float)0.75 * (float)0.75;
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#define MAX_FRAMES 20
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// IPREC is the number of faces in the mesh that models the flag.
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#define IPREC 15
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static int Frames = 10;
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static MESH winMesh[MAX_FRAMES];
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static float sinAngle = (float)0.0;
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static float xTrans = (float)0.0;
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static int curMatl = 0;
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// Material properties.
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static RGBA matlBrightSpecular = {1.0f, 1.0f, 1.0f, 1.0f};
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static RGBA matlDimSpecular = {0.5f, 0.5f, 0.5f, 1.0f};
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static RGBA matlNoSpecular = {0.0f, 0.0f, 0.0f, 0.0f};
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// Lighting properties.
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static GLfloat light0Pos[] = {20.0f, 5.0f, 20.0f, 0.0f};
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static GLfloat light1Pos[] = {-20.0f, 5.0f, 0.0f, 0.0f};
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static RGBA light1Ambient = {0.0f, 0.0f, 0.0f, 0.0f};
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static RGBA light1Diffuse = {0.4f, 0.4f, 0.4f, 1.0f};
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static RGBA light1Specular = {0.0f, 0.0f, 0.0f, 0.0f};
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static RGBA flagColors[] = {{1.0f, 1.0f, 1.0f, 1.0f},
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{0.94f, 0.37f, 0.13f, 1.0f}, // red
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};
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// Default texture resource
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TEX_RES gTexRes = { TEX_BMP, IDB_DEFTEX };
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/******************************Public*Routine******************************\
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* iPtInList
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*
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* Add a vertex and its normal to the mesh. If the vertex already exists,
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* add in the normal to the existing normal (we to accumulate the average
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* normal at each vertex). Normalization of the normals is the
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* responsibility of the caller.
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*
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\**************************************************************************/
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static int iPtInList(MESH *mesh, int start,
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POINT3D *p, POINT3D *norm, BOOL blend)
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{
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int i;
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POINT3D *pts = mesh->pts + start;
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if (blend) {
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for (i = start; i < mesh->numPoints; i++, pts++) {
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if ((pts->x == p->x) && (pts->y == p->y) && (pts->z == p->z)) {
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mesh->norms[i].x += norm->x;
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mesh->norms[i].y += norm->y;
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mesh->norms[i].z += norm->z;
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return i;
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}
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}
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} else {
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i = mesh->numPoints;
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}
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mesh->pts[i] = *p;
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mesh->norms[i] = *norm;
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mesh->numPoints++;
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return i;
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}
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/******************************Public*Routine******************************\
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* getZpos
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*
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* Get the z-position (depth) of the "wavy" flag component at the given x.
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*
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* The function used to model the wave is:
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*
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* 1/2
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* z = x * sin((2*PI*x + sinAngle) / 4)
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*
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* The shape of the wave varies from frame to frame by changing the
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* phase, sinAngle.
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*
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\**************************************************************************/
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float getZpos(float x)
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{
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float xAbs = x - xTrans;
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float angle = sinAngle + ((float) (2.0 * PI) * (xAbs / winTotalwidth));
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xAbs = winTotalwidth - xAbs;
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// xAbs += (winTotalwidth / 2.0);
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return (float)((sin((double)angle) / 4.0) *
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sqrt((double)(xAbs / winTotalwidth )));
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}
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/******************************Public*Routine******************************\
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* genTex
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*
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* Generate a mesh representing a frame of the flag. The phase, sinAngle,
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* is a global variable.
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*
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\**************************************************************************/
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void genTex(MESH *winMesh)
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{
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POINT3D pos;
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POINT3D pts[4];
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float w, h;
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int i;
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newMesh(winMesh, IPREC * IPREC, IPREC * IPREC);
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// Width and height of each face
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w = (winTotalwidth) / (float)(IPREC + 1);
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h = winTotalheight;
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// Generate the mesh data. At equally spaced intervals along the x-axis,
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// we compute the z-position of the flag surface.
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pos.y = (float) 0.0;
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pos.z = (float) 0.0;
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for (i = 0, pos.x = xTrans; i < IPREC; i++, pos.x += w) {
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int faceCount = winMesh->numFaces;
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pts[0].x = (float)pos.x;
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pts[0].y = (float)(pos.y);
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pts[0].z = getZpos(pos.x);
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pts[1].x = (float)pos.x;
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pts[1].y = (float)(pos.y + h);
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pts[1].z = getZpos(pos.x);
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pts[2].x = (float)(pos.x + w);
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pts[2].y = (float)(pos.y);
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pts[2].z = getZpos(pos.x + w);
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pts[3].x = (float)(pos.x + w);
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pts[3].y = (float)(pos.y + h);
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pts[3].z = getZpos(pos.x + w);
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// Compute the face normal.
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ss_calcNorm(&winMesh->faces[faceCount].norm, pts + 2, pts + 1, pts);
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// Add the face to the mesh.
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winMesh->faces[faceCount].material = 0;
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winMesh->faces[faceCount].p[0] = iPtInList(winMesh, 0, pts,
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&winMesh->faces[faceCount].norm, TRUE);
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winMesh->faces[faceCount].p[1] = iPtInList(winMesh, 0, pts + 1,
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&winMesh->faces[faceCount].norm, TRUE);
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winMesh->faces[faceCount].p[2] = iPtInList(winMesh, 0, pts + 2,
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&winMesh->faces[faceCount].norm, TRUE);
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winMesh->faces[faceCount].p[3] = iPtInList(winMesh, 0, pts + 3,
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&winMesh->faces[faceCount].norm, TRUE);
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winMesh->numFaces++;
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}
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// Normalize the vertex normals in the mesh.
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ss_normalizeNorms(winMesh->norms, winMesh->numPoints);
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}
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/******************************Public*Routine******************************\
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* initTexScene
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*
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* Initialize the screen saver.
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*
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* This function is exported to the main module in ss3dfo.c.
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*
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\**************************************************************************/
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void initTexScene()
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{
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int i;
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float angleDelta;
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TEXTURE tex;
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float aspectRatio;
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// Initialize the transform.
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-0.25, 1.0, -0.25, 1.0, 0.0, 3.0);
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glTranslatef(0.0f, 0.0f, -1.5f);
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// Initialize and turn on lighting.
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glLightfv(GL_LIGHT0, GL_POSITION, light0Pos);
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glLightfv(GL_LIGHT1, GL_AMBIENT, (GLfloat *) &light1Ambient);
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glLightfv(GL_LIGHT1, GL_DIFFUSE, (GLfloat *) &light1Diffuse);
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glLightfv(GL_LIGHT1, GL_SPECULAR, (GLfloat *) &light1Specular);
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glLightfv(GL_LIGHT1, GL_POSITION, light1Pos);
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glEnable(GL_LIGHT1);
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glDisable(GL_DEPTH_TEST);
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// Leave OpenGL in a state ready to accept the model view transform (we
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// are going to have the flag vary its orientation from frame to frame).
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glMatrixMode(GL_MODELVIEW);
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// Define orientation of polygon faces.
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glFrontFace(GL_CW);
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// glEnable(GL_CULL_FACE);
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Frames = (int)((float)(MAX_FRAMES / 2) * fTesselFact);
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// Load user texture - if that fails load default texture resource
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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if( ss_LoadTextureFile( &gTexFile, &tex ) ||
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ss_LoadTextureResource( &gTexRes, &tex) )
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{
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glEnable(GL_TEXTURE_2D);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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ss_SetTexture( &tex );
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// Correct aspect ratio of flag to match image.
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//
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// The 1.4 is a correction factor to account for the length of the
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// curve that models the surface ripple of the waving flag. This
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// factor is the length of the curve at zero phase. It would be
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// more accurate to determine the length of the curve at each phase,
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// but this is a sufficient approximation for our purposes.
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aspectRatio = ((float) tex.height / (float) tex.width)
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* (float) 1.4;
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if (aspectRatio < (float) 1.0) {
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winTotalwidth = (float)0.75;
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winTotalheight = winTotalwidth * aspectRatio;
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} else {
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winTotalheight = (float) 0.75;
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winTotalwidth = winTotalheight / aspectRatio;
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};
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}
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if (Frames < 5)
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Frames = 5;
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if (Frames > MAX_FRAMES)
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Frames = MAX_FRAMES;
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// Generate the geometry data (stored in the array of mesh structures),
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// for each frame of the animation. The shape of the flag is varied by
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// changing the global variable sinAngle.
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angleDelta = (float)(2.0 * PI) / (float)Frames;
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sinAngle = (float) 0.0;
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for (i = 0; i < Frames; i++) {
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genTex(&winMesh[i]);
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sinAngle += angleDelta;
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}
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}
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/******************************Public*Routine******************************\
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* delTexScene
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*
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* Cleanup the data associated with this screen saver.
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*
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* This function is exported to the main module in ss3dfo.c.
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*
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\**************************************************************************/
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void delTexScene()
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{
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int i;
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for (i = 0; i < Frames; i++)
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delMesh(&winMesh[i]);
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}
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/******************************Public*Routine******************************\
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* updateTexScene
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*
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* Generate a scene by taking one of the meshes and rendering it with
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* OpenGL.
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*
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* This function is exported to the main module in ss3dfo.c.
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*
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\**************************************************************************/
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void updateTexScene(int flags)
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{
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MESH *mesh;
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MFACE *faces;
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int i;
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static double mxrot = 23.0;
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static double myrot = 23.0;
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static double mzrot = 5.7;
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static double mxrotInc = 0.0;
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static double myrotInc = 3.0;
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static double mzrotInc = 0.0;
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static int h = 0;
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static int frameNum = 0;
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POINT3D *pp;
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POINT3D *pn;
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int lastC, lastD;
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int aOffs, bOffs, cOffs, dOffs;
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int a, b;
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GLfloat s = (GLfloat) 0.0;
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GLfloat ds;
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// In addition to having the flag wave (an effect acheived by switching
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// meshes from frame to frame), the flag changes its orientation from
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// frame to frame. This is done by applying a model view transform.
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glLoadIdentity();
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glRotatef((float)mxrot, 1.0f, 0.0f, 0.0f);
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glRotatef((float)myrot, 0.0f, 1.0f, 0.0f);
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glRotatef((float)mzrot, 0.0f, 0.0f, 1.0f);
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// Divide the texture into IPREC slices. ds is the texture coordinate
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// delta we apply as we move along the x-axis.
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ds = (GLfloat)1.0 / (GLfloat)IPREC;
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// Setup the material property of the flag. The material property, light
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// properties, and polygon orientation will interact with the texture.
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curMatl = 0;
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// glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, &flagColors[0]);
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// glMaterialfv(GL_FRONT, GL_SPECULAR, &matlBrightSpecular);
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// glMaterialf(GL_FRONT, GL_SHININESS, 60.0);
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glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, (GLfloat *) &flagColors[0]);
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glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, (GLfloat *) &matlBrightSpecular);
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glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, (float) 60.0);
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// Pick the mesh for the current frame.
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mesh = &winMesh[frameNum];
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// Take the geometry data is the mesh and convert it to a single OpenGL
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// quad strip. If smooth shading is required, use the vertex normals stored
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// in the mesh. Otherwise, use the face normals.
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//
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// As we define each vertex, we also define a corresponding vertex and
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// texture coordinate.
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glBegin(GL_QUAD_STRIP);
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pp = mesh->pts;
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pn = mesh->norms;
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for (i = 0, faces = mesh->faces, lastC = faces->p[0], lastD = faces->p[1];
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i < mesh->numFaces; i++, faces++) {
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a = faces->p[0];
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b = faces->p[1];
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if (!bSmoothShading) {
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// Since flag is a single quad strip, this isn't needed.
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// But lets keep it in case we ever change to a more
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// complex model (ie., one that uses more than one quad
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// strip).
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#if 0
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if ((a != lastC) || (b != lastD)) {
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glNormal3fv((GLfloat *)&(faces - 1)->norm);
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glTexCoord2f(s, (float) 0.0);
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glVertex3fv((GLfloat *)((char *)pp +
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(lastC << 3) + (lastC << 2)));
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glTexCoord2f(s, (float) 1.0);
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glVertex3fv((GLfloat *)((char *)pp +
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(lastD << 3) + (lastD << 2)));
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s += ds;
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glEnd();
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glBegin(GL_QUAD_STRIP);
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}
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#endif
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if (faces->material != curMatl) {
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curMatl = faces->material;
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glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR,
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(GLfloat *) &matlNoSpecular);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE,
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(GLfloat *) &flagColors[curMatl]);
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}
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glNormal3fv((GLfloat *)&faces->norm);
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glTexCoord2f(s, (float) 0.0);
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glVertex3fv((GLfloat *)((char *)pp + (a << 3) + (a << 2)));
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glTexCoord2f(s, (float) 1.0);
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glVertex3fv((GLfloat *)((char *)pp + (b << 3) + (b << 2)));
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s += ds;
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} else {
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// Since flag is a single quad strip, this isn't needed.
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// But lets keep it in case we ever change to a more
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// complex model (ie., one that uses more than one quad
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// strip).
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#if 0
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if ((a != lastC) || (b != lastD)) {
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cOffs = (lastC << 3) + (lastC << 2);
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dOffs = (lastD << 3) + (lastD << 2);
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glTexCoord2f(s, (float) 0.0);
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glNormal3fv((GLfloat *)((char *)pn + cOffs));
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glVertex3fv((GLfloat *)((char *)pp + cOffs));
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glTexCoord2f(s, (float) 1.0);
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glNormal3fv((GLfloat *)((char *)pn + dOffs));
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glVertex3fv((GLfloat *)((char *)pp + dOffs));
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s += ds;
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glEnd();
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glBegin(GL_QUAD_STRIP);
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}
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#endif
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aOffs = (a << 3) + (a << 2);
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bOffs = (b << 3) + (b << 2);
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if (faces->material != curMatl) {
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curMatl = faces->material;
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glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR,
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(GLfloat *) &matlNoSpecular);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE,
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(GLfloat *) &flagColors[curMatl]);
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}
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glTexCoord2f(s, (float) 0.0);
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glNormal3fv((GLfloat *)((char *)pn + aOffs));
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glVertex3fv((GLfloat *)((char *)pp + aOffs));
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glTexCoord2f(s, (float) 1.0);
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glNormal3fv((GLfloat *)((char *)pn + bOffs));
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glVertex3fv((GLfloat *)((char *)pp + bOffs));
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s += ds;
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}
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lastC = faces->p[2];
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lastD = faces->p[3];
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}
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if (!bSmoothShading) {
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glNormal3fv((GLfloat *)&(faces - 1)->norm);
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glTexCoord2f(s, (float) 0.0);
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glVertex3fv((GLfloat *)((char *)pp + (lastC << 3) + (lastC << 2)));
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glTexCoord2f(s, (float) 1.0);
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glVertex3fv((GLfloat *)((char *)pp + (lastD << 3) + (lastD << 2)));
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} else {
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cOffs = (lastC << 3) + (lastC << 2);
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dOffs = (lastD << 3) + (lastD << 2);
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glTexCoord2f(s, (float) 0.0);
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glNormal3fv((GLfloat *)((char *)pn + cOffs));
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glVertex3fv((GLfloat *)((char *)pp + cOffs));
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glTexCoord2f(s, (float) 1.0);
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glNormal3fv((GLfloat *)((char *)pn + dOffs));
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glVertex3fv((GLfloat *)((char *)pp + dOffs));
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}
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glEnd();
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// Transfer the image to the floating OpenGL window.
|
|
|
|
// Determine the flag orientation for the next frame.
|
|
// What we are doing is an oscillating rotation about the y-axis
|
|
// (mxrotInc and mzrotInc are currently 0).
|
|
|
|
mxrot += mxrotInc;
|
|
myrot += myrotInc;
|
|
mzrot += mzrotInc;
|
|
|
|
if ((myrot < -65.0) || (myrot > 25.0))
|
|
myrotInc = -myrotInc;
|
|
|
|
frameNum++;
|
|
if (frameNum >= Frames)
|
|
frameNum = 0;
|
|
}
|