nuclear@0: #include <stdio.h>
nuclear@0: #include <stdlib.h>
nuclear@0: #include <glide.h>
nuclear@0: #include <windows.h>
nuclear@0: #include "mesh.h"
nuclear@0: 
nuclear@0: #define XSZ	640
nuclear@0: #define YSZ	480
nuclear@0: 
nuclear@0: void display(unsigned int msec);
nuclear@0: void process_vertex(Vertex *vres, const Vertex &vin);
nuclear@0: void draw_mesh(const std::vector<Vertex> &varr);
nuclear@0: void draw_triangle(const Vertex *v);
nuclear@0: 
nuclear@0: unsigned int start_time;
nuclear@0: Matrix4x4 mv_matrix, proj_matrix, norm_matrix;
nuclear@0: Vector4 mat_diffuse;
nuclear@0: Vector3 light_dir;
nuclear@0: std::vector<Vertex> torus;
nuclear@0: 
nuclear@0: int main(void)
nuclear@0: {
nuclear@0: 	GrHwConfiguration hwcfg;
nuclear@0: 
nuclear@0: 	if(!grSstQueryBoards(&hwcfg)) {
nuclear@0: 		fprintf(stderr, "No 3dfx graphics boards detected!\n");
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 	printf("Found %d 3dfx graphics boards!\n", hwcfg.num_sst);
nuclear@0: 
nuclear@0: 	grGlideInit();
nuclear@0: 	if(!grSstQueryHardware(&hwcfg)) {
nuclear@0: 		fprintf(stderr, "No 3dfx graphics hardware detected!\n");
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 	grSstSelect(0);
nuclear@0: 	
nuclear@0: 	if(!grSstWinOpen(0, GR_RESOLUTION_640x480, GR_REFRESH_60Hz, GR_COLORFORMAT_RGBA,
nuclear@0: 			GR_ORIGIN_UPPER_LEFT, 2, 1)) {
nuclear@0: 		fprintf(stderr, "Failed to initialize glide device\n");
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	printf("Voodoo graphics initialized sucessfully!\n");
nuclear@0: 
nuclear@0: 	// setup projection matrix
nuclear@0: 	proj_matrix.perspective(45.0f, 1.3333333f, 0.5, 250.0);
nuclear@0: 
nuclear@0: 	// generate torus mesh
nuclear@0: 	gen_torus(torus, 1.5, 0.5, 24, 12);
nuclear@0: 
nuclear@0: 	// light
nuclear@0: 	light_dir = normalize(Vector3(-0.6f, 1.0f, 2.0f));
nuclear@0: 
nuclear@0: 	// enable W-buffer (depth buffer)
nuclear@0: 	grDepthBufferMode(GR_DEPTHBUFFER_WBUFFER);
nuclear@0: 	grDepthMask(1);
nuclear@0: 	grDepthBufferFunction(GR_CMP_LESS);
nuclear@0: 
nuclear@0: 	// main loop
nuclear@0: 	start_time = GetTickCount();
nuclear@0: 	unsigned int msec = 0;
nuclear@0: 	while((msec = GetTickCount() - start_time) < 8000) {
nuclear@0: 		display(msec);
nuclear@0: 	}
nuclear@0: 	
nuclear@0: 	grGlideShutdown();
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: void display(unsigned int msec)
nuclear@0: {
nuclear@0: 	float t = (float)msec / 1000.0f;
nuclear@0: 
nuclear@0: 	grBufferClear(0x103060ff, 255, GR_WDEPTHVALUE_FARTHEST);
nuclear@0: 
nuclear@0: 	mv_matrix.set_identity();
nuclear@0: 	mv_matrix.translate(0, 0, -8);
nuclear@0: 	mv_matrix.rotate(t * 100.0f, 1, 0, 0);
nuclear@0: 	mv_matrix.rotate(t * 80.0f, 0, 0, 1);
nuclear@0: 
nuclear@0: 	norm_matrix = mv_matrix;
nuclear@0: 	norm_matrix[0][3] = norm_matrix[1][3] = norm_matrix[2][3] = 0.0f;
nuclear@0: 	norm_matrix[3][0] = norm_matrix[3][1] = norm_matrix[3][2] = 0.0f;
nuclear@0: 	norm_matrix[3][3] = 1.0f;
nuclear@0: 
nuclear@0: 	mat_diffuse = Vector4(1.0f, 0.6f, 0.2f, 1.0f);
nuclear@0: 	draw_mesh(torus);
nuclear@0: 
nuclear@0: 	grBufferSwap(1);
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: void process_vertex(Vertex *vres, const Vertex &vin)
nuclear@0: {
nuclear@0: 	// transform with the modelview matrix
nuclear@0: 	vres->pos = transform(vin.pos, mv_matrix);
nuclear@0: 	vres->normal = transform(vin.normal, norm_matrix);
nuclear@0: 
nuclear@0: 	// calculate lighting
nuclear@0: 	float ndotl = dot(vres->normal, light_dir);
nuclear@0: 	if(ndotl < 0.0) ndotl = 0.0;
nuclear@0: 	
nuclear@0: 	Vector3 vdir(0, 0, 1);
nuclear@0: 	Vector3 half_dir = normalize(vdir + light_dir);
nuclear@0: 	float ndoth = dot(vres->normal, half_dir);
nuclear@0: 	if(ndoth < 0.0) ndoth = 0.0;
nuclear@0: 	float spec = pow(ndoth, 32.0);
nuclear@0: 
nuclear@0: 	float red = mat_diffuse.x * ndotl + spec;
nuclear@0: 	float green = mat_diffuse.y * ndotl + spec;
nuclear@0: 	float blue = mat_diffuse.z * ndotl + spec;
nuclear@0: 	
nuclear@0: 
nuclear@0: 	vres->color.x = red > 1.0 ? 1.0 : red;
nuclear@0: 	vres->color.y = green > 1.0 ? 1.0 : green;
nuclear@0: 	vres->color.z = blue > 1.0 ? 1.0 : blue;
nuclear@0: 	vres->color.w = mat_diffuse.w;
nuclear@0: 
nuclear@0: 
nuclear@0: 	// transform with the projection matrix
nuclear@0: 	vres->pos = transform(vres->pos, proj_matrix);
nuclear@0: 
nuclear@0: 	// perspective division
nuclear@0: 	vres->pos.x = vres->pos.x / vres->pos.w;
nuclear@0: 	vres->pos.y = vres->pos.y / vres->pos.w;
nuclear@0: 	vres->pos.z = vres->pos.z / vres->pos.w;
nuclear@0: 
nuclear@0: 	// viewport transformation
nuclear@0: 	vres->pos.x = (vres->pos.x * 0.5 + 0.5) * (float)XSZ;
nuclear@0: 	vres->pos.y = (vres->pos.y * 0.5 + 0.5) * (float)YSZ;
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: void draw_mesh(const std::vector<Vertex> &varr)
nuclear@0: {
nuclear@0: 	static Vertex face_vert[3];
nuclear@0: 	size_t num = varr.size();
nuclear@0: 
nuclear@0: 	int face_vert_idx = 0;
nuclear@0: 
nuclear@0: 	for(int i=0; i<num; i++) {
nuclear@0: 		process_vertex(face_vert + face_vert_idx, varr[i]);
nuclear@0: 
nuclear@0: 		if(++face_vert_idx >= 3) {
nuclear@0: 			draw_triangle(face_vert);
nuclear@0: 			face_vert_idx = 0;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void draw_triangle(const Vertex *v)
nuclear@0: {
nuclear@0: 	GrVertex face[3];
nuclear@0: 
nuclear@0: 	for(int i=0; i<3; i++) {
nuclear@0: 		face[i].x = v[i].pos.x;
nuclear@0: 		face[i].y = v[i].pos.y;
nuclear@0: 		face[i].r = v[i].color.x * 255.0;
nuclear@0: 		face[i].g = v[i].color.y * 255.0;
nuclear@0: 		face[i].b = v[i].color.z * 255.0;
nuclear@0: 		face[i].a = v[i].color.w * 255.0;
nuclear@0: 		face[i].oow = 1.0f / v[i].pos.w;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	grDrawTriangle(face, face + 1, face + 2);
nuclear@0: }