From: John Tsiombikas Date: Wed, 19 Sep 2018 20:09:36 +0000 (+0300) Subject: initial commit X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=o2demo;a=commitdiff_plain;h=33e90b3faf9071620951b4cb7c2c03d82ec7fe76 initial commit --- 33e90b3faf9071620951b4cb7c2c03d82ec7fe76 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..564156e --- /dev/null +++ b/.gitignore @@ -0,0 +1,4 @@ +*.o +*.d +*.swp +demo diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..a359324 --- /dev/null +++ b/Makefile @@ -0,0 +1,15 @@ +src = $(wildcard src/*.c) $(wildcard src/parts/*.c) +obj = $(src:.c=.o) +bin = demo + +CFLAGS = -pedantic -Wall -g -Isrc -I/usr/local/include +LDFLAGS = -L/usr/local/lib $(libgl) -lm -limago + +libgl = -lGL -lGLU -lglut + +$(bin): $(obj) + $(CC) -o $@ $(obj) $(LDFLAGS) + +.PHONY: clean +clean: + rm -f $(obj) $(bin) diff --git a/README.md b/README.md new file mode 100644 index 0000000..1f97aee --- /dev/null +++ b/README.md @@ -0,0 +1,10 @@ +Untitled SGI O2 demo +==================== + +Goal: make a demo that runs well on the SGI O2 R5000 200MHz. +Performance target: 30fps at 800x600 (windowed) on the O2. + +NOTES +----- + +- Lightweight music playback might be warranted instead of OGG/Vorbis streaming. diff --git a/src/cfgopt.c b/src/cfgopt.c new file mode 100644 index 0000000..ef16167 --- /dev/null +++ b/src/cfgopt.c @@ -0,0 +1,125 @@ +#include +#include +#include +#include +#include "cfgopt.h" + +struct options opt = { + 0, /* start_scr */ + 0, /* music */ + 0, /* sball */ + 1 /* vsync */ +}; + +int parse_args(int argc, char **argv) +{ + int i; + char *scrname = 0; + + for(i=1; i s && isspace(*end)) *end-- = 0; + return end > s ? s : 0; +} + +static int bool_value(char *s) +{ + char *ptr = s; + while(*ptr) { + *ptr = tolower(*ptr); + ++ptr; + } + + return strcmp(s, "true") == 0 || strcmp(s, "yes") == 0 || strcmp(s, "1") == 0; +} + +int load_config(const char *fname) +{ + FILE *fp; + char buf[256]; + int nline = 0; + + if(!(fp = fopen(fname, "rb"))) { + return 0; /* just ignore missing config files */ + } + + while(fgets(buf, sizeof buf, fp)) { + char *line, *key, *value; + + ++nline; + if(!(line = strip_space(buf))) { + continue; + } + + if(!(value = strchr(line, '='))) { + fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline); + return -1; + } + *value++ = 0; + + if(!(key = strip_space(line)) || !(value = strip_space(value))) { + fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline); + return -1; + } + + if(strcmp(line, "music") == 0) { + opt.music = bool_value(value); + } else if(strcmp(line, "screen") == 0) { + opt.start_scr = strdup(value); + } else if(strcmp(line, "sball") == 0) { + opt.sball = bool_value(value); + } else if(strcmp(line, "vsync") == 0) { + opt.vsync = bool_value(value); + } else { + fprintf(stderr, "%s:%d invalid option: %s\n", fname, nline, line); + return -1; + } + } + return 0; +} diff --git a/src/cfgopt.h b/src/cfgopt.h new file mode 100644 index 0000000..57c41f6 --- /dev/null +++ b/src/cfgopt.h @@ -0,0 +1,16 @@ +#ifndef CFGOPT_H_ +#define CFGOPT_H_ + +struct options { + const char *start_scr; + int music; + int sball; + int vsync; +}; + +extern struct options opt; + +int parse_args(int argc, char **argv); +int load_config(const char *fname); + +#endif /* CFGOPT_H_ */ diff --git a/src/demo.c b/src/demo.c new file mode 100644 index 0000000..5af3c86 --- /dev/null +++ b/src/demo.c @@ -0,0 +1,167 @@ +#include +#include +#include +#include +#include +#include +#include "demo.h" +#include "screen.h" +#include "cfgopt.h" + +static int console_active; + +int demo_init(int argc, char **argv) +{ + struct screen *scr; + char *env; + + if(load_config("demo.cfg") == -1) { + return -1; + } + if((env = getenv("START_SCR"))) { + opt.start_scr = env; + } + if(parse_args(argc, argv) == -1) { + return -1; + } + + glEnable(GL_DEPTH_TEST); + glEnable(GL_CULL_FACE); + + if(scr_init() == -1) { + return -1; + } + if(opt.start_scr) { + scr = scr_lookup(opt.start_scr); + } else { + scr = scr_screen(0); + } + + if(!scr || scr_change(scr, 4000) == -1) { + fprintf(stderr, "screen %s not found\n", opt.start_scr ? opt.start_scr : "0"); + return -1; + } + + return 0; +} + +void demo_cleanup(void) +{ + scr_shutdown(); +} + +void demo_draw(void) +{ + scr_update(); + scr_draw(); +} + +void demo_reshape(int x, int y) +{ + glViewport(0, 0, x, y); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + gluPerspective(50.0, win_aspect, 0.5, 500.0); +} + +static void change_screen(int idx) +{ + printf("change screen %d\n", idx); + scr_change(scr_screen(idx), 4000); +} + +#define CBUF_SIZE 64 +#define CBUF_MASK (CBUF_SIZE - 1) +void demo_keyboard(int key, int pressed) +{ + static char cbuf[CBUF_SIZE]; + static int rd, wr; + char inp[CBUF_SIZE + 1], *dptr; + int i, nscr; + + if(pressed) { + switch(key) { + case 27: + demo_quit(); + break; + + case '`': + console_active = !console_active; + if(console_active) { + printf("> "); + fflush(stdout); + } else { + putchar('\n'); + } + return; + + case '\b': + if(console_active) { + if(wr != rd) { + printf("\b \b"); + fflush(stdout); + wr = (wr + CBUF_SIZE - 1) & CBUF_MASK; + } + return; + } + break; + + case '\n': + case '\r': + if(console_active) { + dptr = inp; + while(rd != wr) { + *dptr++ = cbuf[rd]; + rd = (rd + 1) & CBUF_MASK; + } + *dptr = 0; + if(inp[0]) { + printf("\ntrying to match: %s\n", inp); + nscr = scr_num_screens(); + for(i=0; iname, inp)) { + change_screen(i); + break; + } + } + } + console_active = 0; + return; + } + break; + + default: + if(key >= '1' && key <= '9' && key <= '1' + scr_num_screens()) { + change_screen(key - '1'); + } else if(key == '0' && scr_num_screens() >= 10) { + change_screen(9); + } + + if(console_active) { + if(key < 256 && isprint(key)) { + putchar(key); + fflush(stdout); + + cbuf[wr] = key; + wr = (wr + 1) & CBUF_MASK; + if(wr == rd) { /* overflow */ + rd = (rd + 1) & CBUF_MASK; + } + } + return; + } + break; + } + + scr_keypress(key); + } +} + +void demo_mbutton(int bn, int pressed, int x, int y) +{ +} + +void demo_mmotion(int x, int y) +{ +} diff --git a/src/demo.h b/src/demo.h new file mode 100644 index 0000000..6d12d65 --- /dev/null +++ b/src/demo.h @@ -0,0 +1,22 @@ +#ifndef DEMO_H_ +#define DEMO_H_ + +int win_width, win_height; +float win_aspect; +unsigned int time_msec; + +int demo_init(int argc, char **argv); +void demo_cleanup(void); + +void demo_draw(void); +void demo_reshape(int x, int y); + +void demo_keyboard(int key, int pressed); +void demo_mbutton(int bn, int pressed, int x, int y); +void demo_mmotion(int x, int y); + +/* defined in main.c */ +void demo_quit(void); +unsigned int get_msec(void); + +#endif /* DEMO_H_ */ diff --git a/src/main.c b/src/main.c new file mode 100644 index 0000000..433993d --- /dev/null +++ b/src/main.c @@ -0,0 +1,98 @@ +#include +#include +#include +#include +#include "demo.h" + +static void disp(void); +static void idle(void); +static void reshape(int x, int y); +static void keydown(unsigned char c, int x, int y); +static void keyup(unsigned char c, int x, int y); +static void mouse(int bn, int st, int x, int y); +static void motion(int x, int y); + +static unsigned int start_time; + + +int main(int argc, char **argv) +{ + glutInit(&argc, argv); + glutInitWindowSize(800, 600); + glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE); + glutCreateWindow("o2demo"); + + glutDisplayFunc(disp); + glutIdleFunc(idle); + glutReshapeFunc(reshape); + glutKeyboardFunc(keydown); + glutKeyboardUpFunc(keyup); + glutMouseFunc(mouse); + glutMotionFunc(motion); + + if(demo_init(argc, argv) == -1) { + return 1; + } + atexit(demo_cleanup); + + start_time = glutGet(GLUT_ELAPSED_TIME); + + glutMainLoop(); + return 0; +} + +void demo_quit(void) +{ + exit(0); +} + +unsigned int get_msec(void) +{ + return glutGet(GLUT_ELAPSED_TIME) - start_time; +} + +static void disp(void) +{ + time_msec = get_msec(); + + demo_draw(); + + glutSwapBuffers(); + assert(glGetError() == GL_NO_ERROR); +} + +static void idle(void) +{ + glutPostRedisplay(); +} + +static void reshape(int x, int y) +{ + win_width = x; + win_height = y; + win_aspect = (float)x / (float)y; + + demo_reshape(x, y); +} + +static void keydown(unsigned char c, int x, int y) +{ + demo_keyboard((int)c, 1); +} + +static void keyup(unsigned char c, int x, int y) +{ + demo_keyboard((int)c, 0); +} + +static void mouse(int bn, int st, int x, int y) +{ + int bidx = bn - GLUT_LEFT_BUTTON; + int press = st == GLUT_DOWN ? 1 : 0; + demo_mbutton(bidx, press, x, y); +} + +static void motion(int x, int y) +{ + demo_mmotion(x, y); +} diff --git a/src/mesh.c b/src/mesh.c new file mode 100644 index 0000000..1ac5295 --- /dev/null +++ b/src/mesh.c @@ -0,0 +1,405 @@ +#include +#include +#include +#include +#include +#include "mesh.h" + +void draw_mesh(struct g3d_mesh *mesh) +{ + glEnableClientState(GL_VERTEX_ARRAY); + glEnableClientState(GL_NORMAL_ARRAY); + glEnableClientState(GL_TEXTURE_COORD_ARRAY); + glEnableClientState(GL_COLOR_ARRAY); + + glVertexPointer(3, GL_FLOAT, sizeof *mesh->varr, &mesh->varr->x); + glNormalPointer(GL_FLOAT, sizeof *mesh->varr, &mesh->varr->nx); + glTexCoordPointer(2, GL_FLOAT, sizeof *mesh->varr, &mesh->varr->u); + glColorPointer(4, GL_UNSIGNED_BYTE, sizeof *mesh->varr, &mesh->varr->r); + + if(mesh->iarr) { + glDrawElements(mesh->prim, mesh->icount, GL_UNSIGNED_SHORT, mesh->iarr); + } else { + glDrawArrays(mesh->prim, 0, mesh->vcount); + } + + glDisableClientState(GL_VERTEX_ARRAY); + glDisableClientState(GL_NORMAL_ARRAY); + glDisableClientState(GL_TEXTURE_COORD_ARRAY); + glDisableClientState(GL_COLOR_ARRAY); +} + +void apply_mesh_xform(struct g3d_mesh *mesh, const float *xform) +{ + int i; + struct g3d_vertex *v = mesh->varr; + + for(i=0; ivcount; i++) { + float x = xform[0] * v->x + xform[4] * v->y + xform[8] * v->z + xform[12]; + float y = xform[1] * v->x + xform[5] * v->y + xform[9] * v->z + xform[13]; + v->z = xform[2] * v->x + xform[6] * v->y + xform[10] * v->z + xform[14]; + v->x = x; + v->y = y; + x = xform[0] * v->nx + xform[4] * v->ny + xform[8] * v->nz; + y = xform[1] * v->nx + xform[5] * v->ny + xform[9] * v->nz; + v->nz = xform[2] * v->nx + xform[6] * v->ny + xform[10] * v->nz; + v->nx = x; + v->ny = y; + ++v; + } +} + +int append_mesh(struct g3d_mesh *ma, struct g3d_mesh *mb) +{ + int i, new_vcount, new_icount; + void *tmp; + uint16_t *iptr; + + if(ma->prim != mb->prim) { + fprintf(stderr, "append_mesh failed, primitive mismatch\n"); + return -1; + } + + if(ma->iarr || mb->iarr) { + if(!ma->iarr) { + if(indexify_mesh(ma) == -1) { + return -1; + } + } else if(!mb->iarr) { + if(indexify_mesh(mb) == -1) { + return -1; + } + } + + new_icount = ma->icount + mb->icount; + if(!(iptr = realloc(ma->iarr, new_icount * sizeof *iptr))) { + fprintf(stderr, "append_mesh: failed to allocate combined index buffer (%d indices)\n", new_icount); + return -1; + } + ma->iarr = iptr; + + iptr += ma->icount; + for(i=0; iicount; i++) { + *iptr++ = mb->iarr[i] + ma->vcount; + } + ma->icount = new_icount; + } + + new_vcount = ma->vcount + mb->vcount; + if(!(tmp = realloc(ma->varr, new_vcount * sizeof *ma->varr))) { + fprintf(stderr, "append_mesh: failed to allocate combined vertex buffer (%d verts)\n", new_vcount); + return -1; + } + ma->varr = tmp; + memcpy(ma->varr + ma->vcount, mb->varr, mb->vcount * sizeof *ma->varr); + ma->vcount = new_vcount; + return 0; +} + +#define FEQ(a, b) ((a) - (b) < 1e-5 && (b) - (a) < 1e-5) +static int cmp_vertex(struct g3d_vertex *a, struct g3d_vertex *b) +{ + if(!FEQ(a->x, b->x) || !FEQ(a->y, b->y) || !FEQ(a->z, b->z)) + return -1; + if(!FEQ(a->nx, b->nx) || !FEQ(a->ny, b->ny) || !FEQ(a->nz, b->nz)) + return -1; + if(!FEQ(a->u, b->u) || !FEQ(a->v, b->v)) + return -1; + if(a->r != b->r || a->g != b->g || a->b != b->b || a->a != b->a) + return -1; + return 0; +} + +static int find_existing(struct g3d_vertex *v, struct g3d_vertex *varr, int vcount) +{ + int i; + for(i=0; iiarr) { + fprintf(stderr, "indexify_mesh failed: already indexed\n"); + return -1; + } + + nfaces = mesh->vcount / mesh->prim; + max_icount = mesh->vcount; + + if(!(mesh->iarr = malloc(max_icount * sizeof *mesh->iarr))) { + fprintf(stderr, "indexify_mesh failed to allocate index buffer of %d indices\n", max_icount); + return -1; + } + + vin = vout = mesh->varr; + iout = mesh->iarr; + + for(i=0; iprim; j++) { + if((idx = find_existing(vin, mesh->varr, out_vcount)) >= 0) { + *iout++ = idx; + } else { + *iout++ = out_vcount++; + if(vin != vout) { + *vout++ = *vin; + } + } + ++vin; + } + } + + /* XXX also shrink buffers? I'll just leave them to max size for now */ + return 0; +} + +void normalize_mesh_normals(struct g3d_mesh *mesh) +{ + int i; + struct g3d_vertex *v = mesh->varr; + + for(i=0; ivcount; i++) { + float mag = sqrt(v->nx * v->nx + v->ny * v->ny + v->nz * v->nz); + float s = (mag == 0.0f) ? 1.0f : 1.0f / mag; + v->nx *= s; + v->ny *= s; + v->nz *= s; + ++v; + } +} + + +static void sphvec(float *res, float theta, float phi, float rad) +{ + theta = -theta; + res[0] = sin(theta) * sin(phi); + res[1] = cos(phi); + res[2] = cos(theta) * sin(phi); +} + +int gen_sphere_mesh(struct g3d_mesh *mesh, float rad, int usub, int vsub) +{ + int i, j; + int nfaces, uverts, vverts; + struct g3d_vertex *vptr; + uint16_t *iptr; + + mesh->prim = GL_QUADS; + + if(usub < 4) usub = 4; + if(vsub < 2) vsub = 2; + + uverts = usub + 1; + vverts = vsub + 1; + + mesh->vcount = uverts * vverts; + nfaces = usub * vsub; + mesh->icount = nfaces * 4; + + if(!(mesh->varr = malloc(mesh->vcount * sizeof *mesh->varr))) { + fprintf(stderr, "gen_sphere_mesh: failed to allocate vertex buffer (%d vertices)\n", mesh->vcount); + return -1; + } + if(!(mesh->iarr = malloc(mesh->icount * sizeof *mesh->iarr))) { + fprintf(stderr, "gen_sphere_mesh: failed to allocate index buffer (%d indices)\n", mesh->icount); + return -1; + } + vptr = mesh->varr; + iptr = mesh->iarr; + + for(i=0; ix, theta, phi, rad); + + vptr->nx = vptr->x / rad; + vptr->ny = vptr->y / rad; + vptr->nz = vptr->z / rad; + vptr->u = u; + vptr->v = v; + vptr->r = chess ? 255 : 64; + vptr->g = 128; + vptr->b = chess ? 64 : 255; + ++vptr; + + if(i < usub && j < vsub) { + int idx = i * vverts + j; + *iptr++ = idx; + *iptr++ = idx + 1; + *iptr++ = idx + vverts + 1; + *iptr++ = idx + vverts; + } + } + } + return 0; +} + +int gen_plane_mesh(struct g3d_mesh *m, float width, float height, int usub, int vsub) +{ + int i, j; + int nfaces, nverts, nidx, uverts, vverts; + float x, y, u, v, du, dv; + struct g3d_vertex *vptr; + uint16_t *iptr; + + if(usub < 1) usub = 1; + if(vsub < 1) vsub = 1; + + nfaces = usub * vsub; + uverts = usub + 1; + vverts = vsub + 1; + du = (float)width / (float)usub; + dv = (float)height / (float)vsub; + + nverts = uverts * vverts; + nidx = nfaces * 4; + + if(!(m->varr = malloc(nverts * sizeof *m->varr))) { + fprintf(stderr, "gen_plane_mesh: failed to allocate vertex buffer (%d vertices)\n", nverts); + return -1; + } + if(!(m->iarr = malloc(nidx * sizeof *m->iarr))) { + fprintf(stderr, "gen_plane_mesh: failed to allocate index buffer (%d indices)\n", nidx); + free(m->varr); + m->varr = 0; + return -1; + } + + m->prim = GL_QUADS; + m->vcount = nverts; + m->icount = nidx; + + vptr = m->varr; + iptr = m->iarr; + + v = 0.0f; + for(i=0; ix = x; + vptr->y = y; + vptr->z = 0.0f; + vptr->nx = 0.0f; + vptr->ny = 0.0f; + vptr->nz = 1.0f; + vptr->u = u; + vptr->v = v; + vptr->r = vptr->g = vptr->b = vptr->a = 255; + ++vptr; + + u += du; + } + v += dv; + } + + for(i=0; iprim = GL_QUADS; + + if(usub < 4) usub = 4; + if(vsub < 2) vsub = 2; + + uverts = usub + 1; + vverts = vsub + 1; + + mesh->vcount = uverts * vverts; + nfaces = usub * vsub; + mesh->icount = nfaces * 4; + + printf("generating torus with %d faces (%d vertices)\n", nfaces, mesh->vcount); + + if(!(mesh->varr = malloc(mesh->vcount * sizeof *mesh->varr))) { + return -1; + } + if(!(mesh->iarr = malloc(mesh->icount * sizeof *mesh->iarr))) { + return -1; + } + vptr = mesh->varr; + iptr = mesh->iarr; + + for(i=0; ix, theta, phi, rad, ringrad); + + vptr->nx = (vptr->x - rcent[0]) / ringrad; + vptr->ny = (vptr->y - rcent[1]) / ringrad; + vptr->nz = (vptr->z - rcent[2]) / ringrad; + vptr->u = u; + vptr->v = v; + vptr->r = chess ? 255 : 64; + vptr->g = 128; + vptr->b = chess ? 64 : 255; + ++vptr; + + if(i < usub && j < vsub) { + int idx = i * vverts + j; + *iptr++ = idx; + *iptr++ = idx + 1; + *iptr++ = idx + vverts + 1; + *iptr++ = idx + vverts; + } + } + } + return 0; +} + diff --git a/src/mesh.h b/src/mesh.h new file mode 100644 index 0000000..5fc4e4d --- /dev/null +++ b/src/mesh.h @@ -0,0 +1,36 @@ +#ifndef MESH_H_ +#define MESH_H_ + +#include + +struct g3d_vertex { + float x, y, z; + float nx, ny, nz; + float u, v; + unsigned char r, g, b, a; +}; + + +struct g3d_mesh { + int prim; + struct g3d_vertex *varr; + uint16_t *iarr; + int vcount, icount; +}; + +int load_mesh(struct g3d_mesh *mesh, const char *fname); +int save_mesh(struct g3d_mesh *mesh, const char *fname); + +void draw_mesh(struct g3d_mesh *mesh); + +void apply_mesh_xform(struct g3d_mesh *mesh, const float *xform); +int append_mesh(struct g3d_mesh *ma, struct g3d_mesh *mb); +int indexify_mesh(struct g3d_mesh *mesh); + +void normalize_mesh_normals(struct g3d_mesh *mesh); + +int gen_sphere_mesh(struct g3d_mesh *mesh, float rad, int usub, int vsub); +int gen_plane_mesh(struct g3d_mesh *mesh, float width, float height, int usub, int vsub); +int gen_torus_mesh(struct g3d_mesh *mesh, float rad, float ringrad, int usub, int vsub); + +#endif /* MESH_H_ */ diff --git a/src/parts/example.c b/src/parts/example.c new file mode 100644 index 0000000..fbfdf7d --- /dev/null +++ b/src/parts/example.c @@ -0,0 +1,104 @@ +#include +#include +#include +#include +#include +#include "demo.h" +#include "mesh.h" +#include "screen.h" + +static int init(void); +static void destroy(void); +static void start(long trans_time); +static void draw(void); + +static struct screen scr = { + "example", + init, + destroy, + start, 0, + draw +}; + +static float cam_theta = -29, cam_phi = 20; +static float cam_dist = 6; + +static struct g3d_mesh torus; + +struct screen *example_screen(void) +{ + return &scr; +} + + +static int init(void) +{ + if(gen_torus_mesh(&torus, 1.0f, 0.35, 24, 12) == -1) { + return -1; + } + return 0; +} + +static void destroy(void) +{ +} + +static void start(long trans_time) +{ + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); +} + +static void update(void) +{ +} + +static void draw(void) +{ + float color[4] = {1, 1, 1, 1}; + float t = (float)time_msec / 10.0f; + + update(); + + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0, 0, -cam_dist); + glRotatef(cam_phi, 1, 0, 0); + glRotatef(cam_theta, 0, 1, 0); + + /* draw floor */ + glPushMatrix(); + glTranslatef(0, -1, 0); + + color[0] = 0.4; + color[1] = 0.75; + color[2] = 0.4; + glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, color); + + glBegin(GL_QUADS); + glNormal3f(0, 1, 0); + glVertex3f(-2, 0, 2); + glVertex3f(2, 0, 2); + glVertex3f(2, 0, -2); + glVertex3f(-2, 0, -2); + glEnd(); + + glPopMatrix(); + + /* draw torus */ + glPushMatrix(); + glTranslatef(0, 0.35, 0); + glRotatef(t, 0, 1, 0); + glRotatef(t, 1, 0, 0); + + color[0] = 0.2; + color[1] = 0.3; + color[2] = 0.9; + glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, color); + + draw_mesh(&torus); + + glPopMatrix(); +} diff --git a/src/screen.c b/src/screen.c new file mode 100644 index 0000000..b4680e4 --- /dev/null +++ b/src/screen.c @@ -0,0 +1,129 @@ +#include +#include +#include +#include +#include "screen.h" +#include "demo.h" + +struct screen *example_screen(void); +/* +struct screen *another_screen(void); +struct screen *athird_screen(void); +*/ + +#define NUM_SCR 32 +static struct screen *scr[NUM_SCR]; +static int num_screens; + +static struct screen *cur, *prev, *next; +static long trans_start, trans_dur; + +int scr_init(void) +{ + int i, idx = 0; + + if(!(scr[idx++] = example_screen())) { + return -1; + } + /* + if(!(scr[idx++] = another_screen())) { + return -1; + } + if(!(scr[idx++] = athird_screen())) { + return -1; + } + */ + num_screens = idx; + + assert(num_screens <= NUM_SCR); + + for(i=0; iinit() == -1) { + return -1; + } + } + return 0; +} + +void scr_shutdown(void) +{ + int i; + for(i=0; ishutdown(); + } +} + +void scr_update(void) +{ + if(prev) { /* we're in the middle of a transition */ + long interval = time_msec - trans_start; + if(interval >= trans_dur) { + if(next->start) { + next->start(trans_dur); + } + prev = 0; + cur = next; + next = 0; + } + } +} + +void scr_draw(void) +{ + if(cur) cur->draw(); +} + +void scr_keypress(int key) +{ + if(cur && cur->keypress) { + cur->keypress(key); + } +} + +struct screen *scr_lookup(const char *name) +{ + int i; + for(i=0; iname, name) == 0) { + return scr[i]; + } + } + return 0; +} + +struct screen *scr_screen(int idx) +{ + return scr[idx]; +} + +int scr_num_screens(void) +{ + return num_screens; +} + +int scr_change(struct screen *s, long trans_time) +{ + if(!s) return -1; + if(s == cur) return 0; + + if(trans_time) { + trans_dur = trans_time / 2; /* half for each part transition out then in */ + trans_start = time_msec; + } else { + trans_dur = 0; + } + + if(cur && cur->stop) { + cur->stop(trans_dur); + prev = cur; + next = s; + } else { + if(s->start) { + s->start(trans_dur); + } + + cur = s; + prev = 0; + } + return 0; +} diff --git a/src/screen.h b/src/screen.h new file mode 100644 index 0000000..c2e4974 --- /dev/null +++ b/src/screen.h @@ -0,0 +1,30 @@ +#ifndef SCREEN_H_ +#define SCREEN_H_ + +struct screen { + char *name; + + int (*init)(void); + void (*shutdown)(void); + + void (*start)(long trans_time); + void (*stop)(long trans_time); + + void (*draw)(void); + + void (*keypress)(int key); +}; + +int scr_init(void); +void scr_shutdown(void); + +void scr_update(void); +void scr_draw(void); +void scr_keypress(int key); + +struct screen *scr_lookup(const char *name); +struct screen *scr_screen(int idx); +int scr_num_screens(void); +int scr_change(struct screen *s, long trans_time); + +#endif /* SCREEN_H_ */