ref: 3c2622aa007b32a3c1e11ea6532c42c2481aca3f
dir: /src/zline.c/
#include "../include/zbuffer.h" #include <stdlib.h> #define ZCMP(z, zpix) (!(zbdt) || z >= (zpix)) /* TODO: Implement blending for lines.*/ void ZB_plot(ZBuffer* zb, ZBufferPoint* p) { GLushort* pz; PIXEL* pp; GLint zz; GLubyte zbdw = zb->depth_write; GLubyte zbdt = zb->depth_test; TGL_BLEND_VARS // PIXEL col; pz = zb->zbuf + (p->y * zb->xsize + p->x); pp = (PIXEL*)((GLbyte*)zb->pbuf + zb->linesize * p->y + p->x * PSZB); zz = p->z >> ZB_POINT_Z_FRAC_BITS; if (ZCMP(zz, *pz)) { //*pp = TGL_BLEND_FUNC_RGB(p->r, p->g, p->b, (*pp)) if(zbdw) *pz = zz; } } #define INTERP_Z static void ZB_line_flat_z(ZBuffer* zb, ZBufferPoint* p1, ZBufferPoint* p2, GLint color) { //GLubyte zbdw = zb->depth_write; GLubyte zbdt = zb->depth_test; #include "zline.h" } /* line with color GLinterpolation */ #define INTERP_Z #define INTERP_RGB static void ZB_line_interp_z(ZBuffer* zb, ZBufferPoint* p1, ZBufferPoint* p2) { //GLubyte zbdw = zb->depth_write; GLubyte zbdt = zb->depth_test; #include "zline.h" } /* no Z GLinterpolation */ static void ZB_line_flat(ZBuffer* zb, ZBufferPoint* p1, ZBufferPoint* p2, GLint color) { //GLubyte zbdw = zb->depth_write; //GLubyte zbdt = zb->depth_test; #include "zline.h" } #define INTERP_RGB static void ZB_line_interp(ZBuffer* zb, ZBufferPoint* p1, ZBufferPoint* p2) { // GLubyte zbdw = zb->depth_write; GLubyte zbdt = zb->depth_test; #include "zline.h" } void ZB_line_z(ZBuffer* zb, ZBufferPoint* p1, ZBufferPoint* p2) { GLint color1, color2; // GLubyte zbdw = zb->depth_write; GLubyte zbdt = zb->depth_test; color1 = RGB_TO_PIXEL(p1->r, p1->g, p1->b); color2 = RGB_TO_PIXEL(p2->r, p2->g, p2->b); /* choose if the line should have its color GLinterpolated or not */ if (color1 == color2) { ZB_line_flat_z(zb, p1, p2, color1); } else { ZB_line_interp_z(zb, p1, p2); } } void ZB_line(ZBuffer* zb, ZBufferPoint* p1, ZBufferPoint* p2) { GLint color1, color2; color1 = RGB_TO_PIXEL(p1->r, p1->g, p1->b); color2 = RGB_TO_PIXEL(p2->r, p2->g, p2->b); /* choose if the line should have its color GLinterpolated or not */ if (color1 == color2) { ZB_line_flat(zb, p1, p2, color1); } else { ZB_line_interp(zb, p1, p2); } }