X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2F3dgfx.c;h=b1dea9f086bee0cd850fc6cd35bd933f2017f342;hb=HEAD;hp=31e649d3d5174770b9ce031237e849d8e1c4d824;hpb=90a1ba8903eed9e3d4b17f4b56cd02ed801dd8b6;p=dosdemo

diff --git a/src/3dgfx.c b/src/3dgfx.c
deleted file mode 100644
index 31e649d..0000000
--- a/src/3dgfx.c
+++ /dev/null
@@ -1,369 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include <assert.h>
-#include "3dgfx.h"
-#include "polyfill.h"
-#include "inttypes.h"
-
-#define STACK_SIZE	8
-typedef float g3d_matrix[16];
-
-#define MAX_VBUF_SIZE	256
-
-struct g3d_state {
-	unsigned int opt;
-	int frontface;
-
-	g3d_matrix mat[G3D_NUM_MATRICES][STACK_SIZE];
-	int mtop[G3D_NUM_MATRICES];
-	int mmode;
-
-	g3d_matrix norm_mat;
-
-	int width, height;
-	void *pixels;
-};
-
-static void xform4_vec3(const float *mat, float *vec);
-static void xform3_vec3(const float *mat, float *vec);
-static void shade(struct g3d_vertex *v);
-
-static struct g3d_state *st;
-static const float idmat[] = {
-	1, 0, 0, 0,
-	0, 1, 0, 0,
-	0, 0, 1, 0,
-	0, 0, 0, 1
-};
-
-int g3d_init(void)
-{
-	int i;
-
-	if(!(st = calloc(1, sizeof *st))) {
-		fprintf(stderr, "failed to allocate G3D context\n");
-		return -1;
-	}
-
-	for(i=0; i<G3D_NUM_MATRICES; i++) {
-		g3d_matrix_mode(i);
-		g3d_load_identity();
-	}
-	return 0;
-}
-
-void g3d_destroy(void)
-{
-	free(st);
-}
-
-void g3d_framebuffer(int width, int height, void *pixels)
-{
-	st->width = width;
-	st->height = height;
-	st->pixels = pixels;
-}
-
-void g3d_enable(unsigned int opt)
-{
-	st->opt |= opt;
-}
-
-void g3d_disable(unsigned int opt)
-{
-	st->opt &= ~opt;
-}
-
-void g3d_setopt(unsigned int opt, unsigned int mask)
-{
-	st->opt = (st->opt & ~mask) | (opt & mask);
-}
-
-unsigned int g3d_getopt(unsigned int mask)
-{
-	return st->opt & mask;
-}
-
-void g3d_front_face(unsigned int order)
-{
-	st->frontface = order;
-}
-
-void g3d_matrix_mode(int mmode)
-{
-	st->mmode = mmode;
-}
-
-void g3d_load_identity(void)
-{
-	int top = st->mtop[st->mmode];
-	memcpy(st->mat[st->mmode][top], idmat, 16 * sizeof(float));
-}
-
-void g3d_load_matrix(const float *m)
-{
-	int top = st->mtop[st->mmode];
-	memcpy(st->mat[st->mmode][top], m, 16 * sizeof(float));
-}
-
-#define M(i,j)	(((i) << 2) + (j))
-void g3d_mult_matrix(const float *m2)
-{
-	int i, j, top = st->mtop[st->mmode];
-	float m1[16];
-	float *dest = st->mat[st->mmode][top];
-
-	memcpy(m1, dest, sizeof m1);
-
-	for(i=0; i<4; i++) {
-		for(j=0; j<4; j++) {
-			*dest++ = m1[M(0,j)] * m2[M(i,0)] +
-				m1[M(1,j)] * m2[M(i,1)] +
-				m1[M(2,j)] * m2[M(i,2)] +
-				m1[M(3,j)] * m2[M(i,3)];
-		}
-	}
-}
-
-void g3d_push_matrix(void)
-{
-	int top = st->mtop[st->mmode];
-	if(top >= G3D_NUM_MATRICES) {
-		fprintf(stderr, "g3d_push_matrix overflow\n");
-		return;
-	}
-	memcpy(st->mat[st->mmode][top + 1], st->mat[st->mmode][top], 16 * sizeof(float));
-	st->mtop[st->mmode] = top + 1;
-}
-
-void g3d_pop_matrix(void)
-{
-	if(st->mtop[st->mmode] <= 0) {
-		fprintf(stderr, "g3d_pop_matrix underflow\n");
-		return;
-	}
-	--st->mtop[st->mmode];
-}
-
-void g3d_translate(float x, float y, float z)
-{
-	float m[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
-	m[12] = x;
-	m[13] = y;
-	m[14] = z;
-	g3d_mult_matrix(m);
-}
-
-void g3d_rotate(float deg, float x, float y, float z)
-{
-	float m[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
-
-	float angle = M_PI * deg / 180.0f;
-	float sina = sin(angle);
-	float cosa = cos(angle);
-	float one_minus_cosa = 1.0f - cosa;
-	float nxsq = x * x;
-	float nysq = y * y;
-	float nzsq = z * z;
-
-	m[0] = nxsq + (1.0f - nxsq) * cosa;
-	m[4] = x * y * one_minus_cosa - z * sina;
-	m[8] = x * z * one_minus_cosa + y * sina;
-	m[1] = x * y * one_minus_cosa + z * sina;
-	m[5] = nysq + (1.0 - nysq) * cosa;
-	m[9] = y * z * one_minus_cosa - x * sina;
-	m[2] = x * z * one_minus_cosa - y * sina;
-	m[6] = y * z * one_minus_cosa + x * sina;
-	m[10] = nzsq + (1.0 - nzsq) * cosa;
-	m[15] = 1.0f;
-
-	g3d_mult_matrix(m);
-}
-
-void g3d_scale(float x, float y, float z)
-{
-	float m[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
-	m[0] = x;
-	m[5] = y;
-	m[10] = z;
-	m[15] = 1.0f;
-	g3d_mult_matrix(m);
-}
-
-void g3d_ortho(float left, float right, float bottom, float top, float znear, float zfar)
-{
-	float m[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
-
-	float dx = right - left;
-	float dy = top - bottom;
-	float dz = zfar - znear;
-
-	m[0] = 2.0 / dx;
-	m[5] = 2.0 / dy;
-	m[10] = -2.0 / dz;
-	m[12] = -(right + left) / dx;
-	m[13] = -(top + bottom) / dy;
-	m[14] = -(zfar + znear) / dz;
-
-	g3d_mult_matrix(m);
-}
-
-void g3d_frustum(float left, float right, float bottom, float top, float nr, float fr)
-{
-	float m[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
-
-	float dx = right - left;
-	float dy = top - bottom;
-	float dz = fr - nr;
-
-	float a = (right + left) / dx;
-	float b = (top + bottom) / dy;
-	float c = -(fr + nr) / dz;
-	float d = -2.0 * fr * nr / dz;
-
-	m[0] = 2.0 * nr / dx;
-	m[5] = 2.0 * nr / dy;
-	m[8] = a;
-	m[9] = b;
-	m[10] = c;
-	m[11] = -1.0f;
-	m[14] = d;
-
-	g3d_mult_matrix(m);
-}
-
-void g3d_perspective(float vfov_deg, float aspect, float znear, float zfar)
-{
-	float m[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
-
-	float vfov = M_PI * vfov_deg / 180.0f;
-	float s = 1.0f / tan(vfov * 0.5f);
-	float range = znear - zfar;
-
-	m[0] = s / aspect;
-	m[5] = s;
-	m[10] = (znear + zfar) / range;
-	m[11] = -1.0f;
-	m[14] = 2.0f * znear * zfar / range;
-
-	g3d_mult_matrix(m);
-}
-
-const float *g3d_get_matrix(int which, float *m)
-{
-	int top = st->mtop[which];
-
-	if(m) {
-		memcpy(m, st->mat[which][top], 16 * sizeof(float));
-	}
-	return st->mat[which][top];
-}
-
-void g3d_draw(int prim, const struct g3d_vertex *varr, int varr_size)
-{
-	g3d_draw_indexed(prim, varr, varr_size, 0, 0);
-}
-
-void g3d_draw_indexed(int prim, const struct g3d_vertex *varr, int varr_size,
-		const int16_t *iarr, int iarr_size)
-{
-	int i, j, nfaces;
-	struct pvertex pv[4];
-	struct g3d_vertex v[4];
-	int vnum = prim; /* primitive vertex counts correspond to enum values */
-	int mvtop = st->mtop[G3D_MODELVIEW];
-	int ptop = st->mtop[G3D_PROJECTION];
-
-	/* calc the normal matrix */
-	memcpy(st->norm_mat, st->mat[G3D_MODELVIEW][mvtop], 16 * sizeof(float));
-	st->norm_mat[12] = st->norm_mat[13] = st->norm_mat[14] = 0.0f;
-
-	nfaces = (iarr ? iarr_size : varr_size) / vnum;
-
-	for(j=0; j<nfaces; j++) {
-
-		for(i=0; i<vnum; i++) {
-			v[i] = iarr ? varr[*iarr++] : *varr++;
-
-			xform4_vec3(st->mat[G3D_MODELVIEW][mvtop], &v[i].x);
-			xform3_vec3(st->norm_mat, &v[i].nx);
-
-			if(st->opt & G3D_LIGHTING) {
-				shade(v + i);
-			}
-			xform4_vec3(st->mat[G3D_PROJECTION][ptop], &v[i].x);
-		}
-
-		/* TODO clipping */
-
-		for(i=0; i<vnum; i++) {
-			if(v[i].w != 0.0f) {
-				v[i].x /= v[i].w;
-				v[i].y /= v[i].w;
-				/*v[i].z /= v[i].w;*/
-			}
-
-			/* viewport transformation */
-			v[i].x = (v[i].x * 0.5f + 0.5f) * (float)st->width;
-			v[i].y = (0.5f - v[i].y * 0.5f) * (float)st->height;
-
-			/* convert pos to 24.8 fixed point */
-			pv[i].x = (int32_t)(v[i].x * 256.0f);
-			pv[i].y = (int32_t)(v[i].y * 256.0f);
-			/* convert tex coords to 16.16 fixed point */
-			pv[i].u = (int32_t)(v[i].u * 65536.0f);
-			pv[i].v = (int32_t)(v[i].v * 65536.0f);
-			/* pass the color through as is */
-			pv[i].r = v[i].r;
-			pv[i].g = v[i].g;
-			pv[i].b = v[i].b;
-		}
-
-		/* backface culling */
-		if(vnum > 2 && st->opt & G3D_CULL_FACE) {
-			int32_t ax = pv[1].x - pv[0].x;
-			int32_t ay = pv[1].y - pv[0].y;
-			int32_t bx = pv[2].x - pv[0].x;
-			int32_t by = pv[2].y - pv[0].y;
-			int32_t cross_z = ax * (by >> 8) - ay * (bx >> 8);
-			int sign = (cross_z >> 31) & 1;
-
-			if(!(sign ^ st->frontface)) {
-				continue;	/* back-facing */
-			}
-		}
-
-		polyfill_flat(pv, vnum);
-	}
-}
-
-static void xform4_vec3(const float *mat, float *vec)
-{
-	float x = mat[0] * vec[0] + mat[4] * vec[1] + mat[8] * vec[2] + mat[12];
-	float y = mat[1] * vec[0] + mat[5] * vec[1] + mat[9] * vec[2] + mat[13];
-	float z = mat[2] * vec[0] + mat[6] * vec[1] + mat[10] * vec[2] + mat[14];
-	float w = mat[3] * vec[0] + mat[7] * vec[1] + mat[11] * vec[2] + mat[15];
-
-	vec[0] = x;
-	vec[1] = y;
-	vec[2] = z;
-	vec[3] = w;
-}
-
-static void xform3_vec3(const float *mat, float *vec)
-{
-	float x = mat[0] * vec[0] + mat[4] * vec[1] + mat[8] * vec[2];
-	float y = mat[1] * vec[0] + mat[5] * vec[1] + mat[9] * vec[2];
-	float z = mat[2] * vec[0] + mat[6] * vec[1] + mat[10] * vec[2];
-
-	vec[0] = x;
-	vec[1] = y;
-	vec[2] = z;
-}
-
-static void shade(struct g3d_vertex *v)
-{
-	v->r = v->g = v->b = 255;
-}