507 lines
12 KiB
C
507 lines
12 KiB
C
/***************************************************************************/
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/*
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* pieMatrix.c
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*
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* matrix functions for pumpkin image library.
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*
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*/
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/***************************************************************************/
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#include <stdio.h>
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#ifdef _MSC_VER
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#include <windows.h> //needed for gl.h! --Qamly
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#endif
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include "piedef.h"
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#include "pieclip.h"
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#include "piematrix.h"
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#include "rendmode.h"
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#include "bug.h"
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/***************************************************************************/
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/*
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* Local Definitions
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*/
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/***************************************************************************/
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/*
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Playstation and PC stuff ... just the matrix stack & surface normal code is all thats needed on the PSX
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*/
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#define MATRIX_MAX 8
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#define ONE_PERCENT 41 // 4096/100
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static SDMATRIX aMatrixStack[MATRIX_MAX];
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SDMATRIX *psMatrix = &aMatrixStack[0];
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static BOOL perspective = FALSE;
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BOOL drawing_interface = TRUE;
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void pie_VectorNormalise(iVector *v)
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{
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int32 size;
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iVector av;
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av.x = pie_ABS(v->x);
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av.y = pie_ABS(v->y);
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av.z = pie_ABS(v->z);
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if (av.x >= av.y) {
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if (av.x > av.z)
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size = av.x + (av.z >> 2) + (av.y >> 2);
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else
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size = av.z + (av.x >> 2) + (av.y >> 2);
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} else {
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if (av.y > av.z)
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size = av.y + (av.z >> 2) + (av.x >> 2);
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else
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size = av.z + (av.y >> 2) + (av.x >> 2);
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}
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if (size > 0) {
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v->x = (v->x << FP12_SHIFT) / size;
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v->y = (v->y << FP12_SHIFT) / size;
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v->z = (v->z << FP12_SHIFT) / size;
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}
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}
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//*************************************************************************
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//*** calculate surface normal
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//*
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//* params p1,p2,p3 = points for forming 2 vector for cross product
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//* v = normal vector returned << FP12_SHIFT
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//*
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//* eg if a polygon (with n points in clockwise order) normal
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//* is required, p1 = point 0, p2 = point 1, p3 = point n-1
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//*
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//******
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void pie_SurfaceNormal(iVector *p1, iVector *p2, iVector *p3, iVector *v)
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{
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iVector a, b;
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a.x = p3->x - p1->x;
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a.y = p3->y - p1->y;
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a.z = p3->z - p1->z;
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pie_VectorNormalise(&a);
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b.x = p2->x - p1->x;
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b.y = p2->y - p1->y;
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b.z = p2->z - p1->z;
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pie_VectorNormalise(&b);
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v->x = ((a.y * b.z) - (a.z * b.y)) >> FP12_SHIFT;
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v->y = ((a.z * b.x) - (a.x * b.z)) >> FP12_SHIFT;
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v->z = ((a.x * b.y) - (a.y * b.x)) >> FP12_SHIFT;
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pie_VectorNormalise(v);
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}
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#define SC_TABLESIZE 4096
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//*************************************************************************
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#define X_INTERCEPT(pt1,pt2,yy) \
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(pt2->x - (((pt2->y - yy) * (pt1->x - pt2->x)) / (pt1->y - pt2->y)))
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//*************************************************************************
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static SDMATRIX _MATRIX_ID = {FP12_MULTIPLIER,0,0, 0,FP12_MULTIPLIER,0, 0,0,FP12_MULTIPLIER, 0L,0L,0L};
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static SDWORD _MATRIX_INDEX;
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//*************************************************************************
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SDWORD aSinTable[SC_TABLESIZE + (SC_TABLESIZE/4)];
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//*************************************************************************
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//*** reset transformation matrix stack and make current identity
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//*
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//******
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void pie_MatReset(void)
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{
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// printf("pie_MatReset\n");
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psMatrix = &aMatrixStack[0];
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// make 1st matrix identity
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*psMatrix = _MATRIX_ID;
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glLoadIdentity();
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}
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//*************************************************************************
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//*** create new matrix from current transformation matrix and make current
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//*
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//******
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void pie_MatBegin(void)
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{
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_MATRIX_INDEX++;
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if (_MATRIX_INDEX > 3)
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{
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ASSERT((_MATRIX_INDEX < MATRIX_MAX,"pie_MatBegin past top of the stack"));
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}
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psMatrix++;
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aMatrixStack[_MATRIX_INDEX] = aMatrixStack[_MATRIX_INDEX-1];
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glPushMatrix();
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}
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//*************************************************************************
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//*** make current transformation matrix previous one on stack
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//*
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//******
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void pie_MatEnd(void)
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{
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_MATRIX_INDEX--;
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ASSERT((_MATRIX_INDEX >= 0,"pie_MatEnd of the bottom of the stack"));
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psMatrix--;
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glPopMatrix();
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}
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void pie_MATTRANS(int x, int y, int z) {
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GLfloat matrix[16];
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psMatrix->j = x<<FP12_SHIFT;
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psMatrix->k = y<<FP12_SHIFT;
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psMatrix->l = z<<FP12_SHIFT;
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glGetFloatv(GL_MODELVIEW_MATRIX, matrix);
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matrix[12] = x;
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matrix[13] = y;
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matrix[14] = z;
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glLoadIdentity();
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glMultMatrixf(matrix);
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}
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void pie_TRANSLATE(int x, int y, int z) {
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psMatrix->j += ((x) * psMatrix->a + (y) * psMatrix->d + (z) * psMatrix->g);
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psMatrix->k += ((x) * psMatrix->b + (y) * psMatrix->e + (z) * psMatrix->h);
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psMatrix->l += ((x) * psMatrix->c + (y) * psMatrix->f + (z) * psMatrix->i);
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glTranslatef(x, y, z);
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}
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//*************************************************************************
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//*** matrix scale current transformation matrix
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//*
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//******
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void pie_MatScale( UDWORD percent )
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{
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SDWORD scaleFactor;
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if(percent == 100)
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{
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return;
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}
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scaleFactor = percent * ONE_PERCENT;
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psMatrix->a = (psMatrix->a * scaleFactor) / 4096;
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psMatrix->b = (psMatrix->b * scaleFactor) / 4096;
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psMatrix->c = (psMatrix->c * scaleFactor) / 4096;
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psMatrix->d = (psMatrix->d * scaleFactor) / 4096;
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psMatrix->e = (psMatrix->e * scaleFactor) / 4096;
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psMatrix->f = (psMatrix->f * scaleFactor) / 4096;
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psMatrix->g = (psMatrix->g * scaleFactor) / 4096;
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psMatrix->h = (psMatrix->h * scaleFactor) / 4096;
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psMatrix->i = (psMatrix->i * scaleFactor) / 4096;
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glScalef(0.01*percent, 0.01*percent, 0.01*percent);
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}
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//*************************************************************************
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//*** matrix rotate y (yaw) current transformation matrix
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//*
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//******
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void pie_MatRotY(int y)
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{
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// printf("pie_MatRotY %i\n", y);
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int t;
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int cra, sra;
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if (y != 0) {
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cra = COS(y);
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sra = SIN(y);
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t = ((cra * psMatrix->a) - (sra * psMatrix->g))>>FP12_SHIFT;
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psMatrix->g = ((sra * psMatrix->a) + (cra * psMatrix->g))>>FP12_SHIFT;
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psMatrix->a = t;
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t = ((cra * psMatrix->b) - (sra * psMatrix->h))>>FP12_SHIFT;
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psMatrix->h = ((sra * psMatrix->b) + (cra * psMatrix->h))>>FP12_SHIFT;
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psMatrix->b = t;
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t = ((cra * psMatrix->c) - (sra * psMatrix->i))>>FP12_SHIFT;
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psMatrix->i = ((sra * psMatrix->c) + (cra * psMatrix->i))>>FP12_SHIFT;
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psMatrix->c = t;
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}
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glRotatef(y*22.5/4096.0, 0, 1, 0);
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}
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//*************************************************************************
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//*** matrix rotate z (roll) current transformation matrix
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//*
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//******
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void pie_MatRotZ(int z)
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{
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// printf("pie_MatRotZ %i\n", z);
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int t;
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int cra, sra;
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if (z != 0) {
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cra = COS(z);
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sra = SIN(z);
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t = ((cra * psMatrix->a) + (sra * psMatrix->d))>>FP12_SHIFT;
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psMatrix->d = ((cra * psMatrix->d) - (sra * psMatrix->a))>>FP12_SHIFT;
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psMatrix->a = t;
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t = ((cra * psMatrix->b) + (sra * psMatrix->e))>>FP12_SHIFT;
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psMatrix->e = ((cra * psMatrix->e) - (sra * psMatrix->b))>>FP12_SHIFT;
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psMatrix->b = t;
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t = ((cra * psMatrix->c) + (sra * psMatrix->f))>>FP12_SHIFT;
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psMatrix->f = ((cra * psMatrix->f) - (sra * psMatrix->c))>>FP12_SHIFT;
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psMatrix->c = t;
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}
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glRotatef(z*22.5/4096.0, 0, 0, 1);
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}
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//*************************************************************************
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//*** matrix rotate x (pitch) current transformation matrix
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//*
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//******
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void pie_MatRotX(int x)
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{
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// printf("pie_MatRotX %i\n", x);
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int cra, sra;
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int t;
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if (x != 0) {
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cra = COS(x);
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sra = SIN(x);
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t = ((cra * psMatrix->d) + (sra * psMatrix->g))>>FP12_SHIFT;
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psMatrix->g = ((cra * psMatrix->g) - (sra * psMatrix->d))>>FP12_SHIFT;
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psMatrix->d = t;
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t = ((cra * psMatrix->e) + (sra * psMatrix->h))>>FP12_SHIFT;
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psMatrix->h = ((cra * psMatrix->h) - (sra * psMatrix->e))>>FP12_SHIFT;
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psMatrix->e = t;
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t = ((cra * psMatrix->f) + (sra * psMatrix->i))>>FP12_SHIFT;
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psMatrix->i = ((cra * psMatrix->i) - (sra * psMatrix->f))>>FP12_SHIFT;
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psMatrix->f = t;
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}
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glRotatef(x*22.5/4096.0, 1, 0, 0);
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}
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//*************************************************************************
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//*** 3D vector perspective projection
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//*
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//* params v1 = 3D vector to project
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//* v2 = pointer to 2D resultant vector
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//*
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//* on exit v2 = projected vector
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//*
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//* returns rotated and translated z component of v1
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//*
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//******
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int32 pie_RotateProject(SDWORD x, SDWORD y, SDWORD z, SDWORD* xs, SDWORD* ys)
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{
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int32 zfx, zfy;
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int32 zz, _x, _y, _z;
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_x = x * psMatrix->a+y * psMatrix->d+z * psMatrix->g + psMatrix->j;
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_y = x * psMatrix->b+y * psMatrix->e+z * psMatrix->h + psMatrix->k;
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_z = x * psMatrix->c+y * psMatrix->f+z * psMatrix->i + psMatrix->l;
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zz = _z >> STRETCHED_Z_SHIFT;
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zfx = _z >> psRendSurface->xpshift;
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zfy = _z >> psRendSurface->ypshift;
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if ((zfx<=0) || (zfy<=0))
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{
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xs = LONG_WAY;//just along way off screen
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ys = LONG_WAY;
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}
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else if (zz < MIN_STRETCHED_Z)
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{
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xs = LONG_WAY;//just along way off screen
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ys = LONG_WAY;
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}
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else
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{
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*xs = psRendSurface->xcentre + (_x / zfx);
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*ys = psRendSurface->ycentre - (_y / zfy);
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}
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return zz;
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}
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int32 pie_RotProj(iVector *v3d, iPoint *v2d)
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{
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return pie_RotateProject(v3d->x, v3d->y, v3d->z, &(v2d->x), &(v2d->y));
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}
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int32 pie_Transform(iVector *v3d, iPoint *v2d)
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{
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v2d->x = v3d->x;
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v2d->y = v3d->y;
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return v3d->z;
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}
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//*************************************************************************
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void pie_PerspectiveBegin() {
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float width = pie_GetVideoBufferWidth();
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float height = pie_GetVideoBufferHeight();
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float xangle = width/6;
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float yangle = height/6;
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glTranslatef((2*psRendSurface->xcentre-width)/width,
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(height-2*psRendSurface->ycentre)/height , 0);
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glFrustum(-xangle, xangle, -yangle, yangle, 330, 100000);
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glScalef(1, 1, -1);
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glMatrixMode(GL_MODELVIEW);
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}
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void pie_PerspectiveEnd() {
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(0, pie_GetVideoBufferWidth(), pie_GetVideoBufferHeight(), 0, 1, -1);
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glMatrixMode(GL_MODELVIEW);
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}
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void pie_Begin3DScene(void) {
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glDepthRange(0.1, 1);
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drawing_interface = FALSE;
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}
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void pie_BeginInterface(void) {
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glDepthRange(0, 0.1);
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drawing_interface = TRUE;
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}
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//*************************************************************************
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void pie_SetGeometricOffset(int x, int y)
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{
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psRendSurface->xcentre = x;
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psRendSurface->ycentre = y;
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}
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// all these routines use the PC format of iVertex ... and are not used on the PSX
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//*************************************************************************
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BOOL pie_Clockwise(iVertex *s)
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{
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return (((s[1].y - s[0].y) * (s[2].x - s[1].x)) <=
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((s[1].x - s[0].x) * (s[2].y - s[1].y)));
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}
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BOOL pie_PieClockwise(PIEVERTEX *s)
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{
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return (((s[1].sy - s[0].sy) * (s[2].sx - s[1].sx)) <=
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((s[1].sx - s[0].sx) * (s[2].sy - s[1].sy)));
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}
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//*************************************************************************
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//*** inverse rotate 3D vector with current rotation matrix
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//*
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//* params v1 = pointer to 3D vector to rotate
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//* v2 = pointer to 3D resultant vector
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//*
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//* on exit v2 = inverse-rotated vector
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//*
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//******
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void pie_VectorInverseRotate0(iVector *v1, iVector *v2)
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{
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int32 x, y, z;
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x = v1->x; y = v1->y; z = v1->z;
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v2->x = (x * psMatrix->a+y * psMatrix->b+z * psMatrix->c) >> FP12_SHIFT;
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v2->y = (x * psMatrix->d+y * psMatrix->e+z * psMatrix->f) >> FP12_SHIFT;
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v2->z = (x * psMatrix->g+y * psMatrix->h+z * psMatrix->i) >> FP12_SHIFT;
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}
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//*************************************************************************
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//*** setup transformation matrices/quaternions and trig tables
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//*
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//******
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void pie_MatInit(void)
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{
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unsigned i, scsize;
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double conv, v;
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// sin/cos table
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scsize = SC_TABLESIZE + (SC_TABLESIZE / 4);
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conv = (float)(PI / (0.5 * SC_TABLESIZE));
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for (i=0; i<scsize; i++) {
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v = (double) sin(i * conv) * FP12_MULTIPLIER;
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if (v >= 0.0)
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aSinTable[i] = (int32)(v + 0.5);
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else
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aSinTable[i] = (int32)(v - 0.5);
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}
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// init matrix/quat stack
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pie_MatReset();
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iV_DEBUG0("geo[_geo_setup] = setup successful\n");
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}
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