+++ /dev/null
-#include <stdio.h>
-#include <math.h>
-#include <string.h>
-#include "3dgfx.h"
-#include "polyfill.h"
-
-#define STACK_SIZE 8
-typedef float g3d_matrix[16];
-
-struct g3d_state {
- unsigned int opt;
-
- g3d_matrix mat[G3D_NUM_MATRICES][STACK_SIZE];
- int mtop[G3D_NUM_MATRICES];
-
- 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 proc_vertex(struct pvertex *res, const struct g3d_vertex *vert, int space);
-
-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
-};
-
-void g3d_init(void)
-{
- int i;
-
- memset(&st, 0, sizeof st);
-
- for(i=0; i<G3D_NUM_MATRICES; i++) {
- g3d_set_matrix(i, 0);
- }
-}
-
-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_set_matrix(int which, const float *m)
-{
- int top = st.mtop[which];
-
- if(!m) m = idmat;
- memcpy(st.mat[which][top], m, 16 * sizeof(float));
-}
-
-#define M(i,j) (((i) << 2) + (j))
-void g3d_mult_matrix(int which, const float *m2)
-{
- int i, j, top = st.mtop[which];
- float m1[16];
- float *dest = st.mat[which][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(int which)
-{
- int top = st.mtop[which];
- if(top >= G3D_NUM_MATRICES) {
- fprintf(stderr, "g3d_push_matrix overflow\n");
- return;
- }
- memcpy(st.mat[which][top + 1], st.mat[which][top], 16 * sizeof(float));
- st.mtop[which] = top + 1;;
-}
-
-void g3d_pop_matrix(int which)
-{
- if(st.mtop[which] <= 0) {
- fprintf(stderr, "g3d_pop_matrix underflow\n");
- return;
- }
- --st.mtop[which];
-}
-
-void g3d_translate(int which, 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(which, m);
-}
-
-void g3d_rotate(int which, 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;
-
- g3d_mult_matrix(which, m);
-}
-
-void g3d_scale(int which, 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;
- g3d_mult_matrix(which, m);
-}
-
-void g3d_ortho(int which, 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(which, m);
-}
-
-void g3d_frustum(int which, 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(which, m);
-}
-
-void g3d_perspective(int which, 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(which, m);
-}
-
-void g3d_draw(int prim, int space, const struct g3d_vertex *varr, int varr_size)
-{
- int i;
- int vnum = prim; /* primitive vertex counts correspond to the enum values */
-
- while(varr_size >= vnum) {
- struct pvertex pv[4];
-
- for(i=0; i<vnum; i++) {
- proc_vertex(pv + i, varr++, space);
- }
-
- polyfill_wire(pv, vnum);
-
- varr_size -= 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;
-}
-
-#define VEC3(v, x, y, z) do { v[0] = x; v[1] = y; v[2] = z; } while(0)
-#define VEC4(v, x, y, z, w) do { v[0] = x; v[1] = y; v[2] = z; v[3] = w; } while(0)
-
-static void proc_vertex(struct pvertex *res, const struct g3d_vertex *vert, int space)
-{
- float pos[4];
- float norm[3];
- float color[3];
- int mvtop = st.mtop[G3D_MODELVIEW];
- int ptop = st.mtop[G3D_PROJECTION];
- g3d_matrix norm_mat;
-
- VEC4(pos, vert->x, vert->y, vert->z, 1.0f);
- VEC3(norm, vert->nx, vert->ny, vert->nz);
-
- switch(space) {
- case G3D_LOCAL_SPACE:
- memcpy(norm_mat, st.mat[G3D_MODELVIEW][mvtop], 16 * sizeof(float));
- norm_mat[12] = norm_mat[13] = norm_mat[14] = 0.0f;
-
- xform4_vec3(pos, st.mat[G3D_MODELVIEW][mvtop]);
- xform3_vec3(norm, norm_mat);
-
- case G3D_VIEW_SPACE:
- if(st.opt & G3D_LIGHTING) {
- /* TODO lighting */
- color[0] = vert->r;
- color[1] = vert->g;
- color[2] = vert->b;
- }
- xform4_vec3(pos, st.mat[G3D_PROJECTION][ptop]);
-
- case G3D_CLIP_SPACE:
- /* TODO clipping */
- if(pos[3] != 0.0f) {
- pos[0] /= pos[3];
- pos[1] /= pos[3];
- pos[2] /= pos[3];
- }
-
- case G3D_SCREEN_SPACE:
- pos[0] = (pos[0] * 0.5 + 0.5) * (float)st.width;
- pos[1] = (0.5 - pos[0] * 0.5) * (float)st.height;
-
- case G3D_PIXEL_SPACE:
- break;
- }
-
- /* convert pos to 24.8 fixed point */
- res->x = (int32_t)(pos[0] * 256.0f);
- res->y = (int32_t)(pos[1] * 256.0f);
-
- /* convert tex coords to 16.16 fixed point */
- res->u = (int32_t)(vert->u * 65536.0f);
- res->v = (int32_t)(vert->v * 65536.0f);
-
- /* pass color through as is */
- res->r = color[0];
- res->g = color[1];
- res->b = color[2];
-}
projects / dosdemo / blobdiff