2 * QEMU model of the Milkymist texture mapping unit.
5 * Copyright (c) 2010 Sebastien Bourdeauducq
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
22 * Specification available at:
23 * http://milkymist.walle.cc/socdoc/tmu2.pdf
27 #include "qemu/osdep.h"
30 #include "hw/sysbus.h"
32 #include "qapi/error.h"
33 #include "qemu/error-report.h"
34 #include "qemu/module.h"
35 #include "qapi/error.h"
36 #include "hw/display/milkymist_tmu2.h"
40 #include <epoxy/glx.h>
66 CTL_START_BUSY = (1<<0),
67 CTL_CHROMAKEY = (1<<1),
84 #define TYPE_MILKYMIST_TMU2 "milkymist-tmu2"
85 #define MILKYMIST_TMU2(obj) \
86 OBJECT_CHECK(MilkymistTMU2State, (obj), TYPE_MILKYMIST_TMU2)
88 struct MilkymistTMU2State {
89 SysBusDevice parent_obj;
91 MemoryRegion regs_region;
98 GLXFBConfig glx_fb_config;
99 GLXContext glx_context;
101 typedef struct MilkymistTMU2State MilkymistTMU2State;
103 static const int glx_fbconfig_attr[] = {
110 static int tmu2_glx_init(MilkymistTMU2State *s)
112 GLXFBConfig *configs;
115 s->dpy = XOpenDisplay(NULL); /* FIXME: call XCloseDisplay() */
116 if (s->dpy == NULL) {
120 configs = glXChooseFBConfig(s->dpy, 0, glx_fbconfig_attr, &nelements);
121 if (configs == NULL) {
125 s->glx_fb_config = *configs;
128 /* FIXME: call glXDestroyContext() */
129 s->glx_context = glXCreateNewContext(s->dpy, s->glx_fb_config,
130 GLX_RGBA_TYPE, NULL, 1);
131 if (s->glx_context == NULL) {
138 static void tmu2_gl_map(struct vertex *mesh, int texhres, int texvres,
139 int hmeshlast, int vmeshlast, int ho, int vo, int sw, int sh)
143 int u0, v0, u1, v1, u2, v2, u3, v3;
144 double xscale = 1.0 / ((double)(64 * texhres));
145 double yscale = 1.0 / ((double)(64 * texvres));
148 glTranslatef(ho, vo, 0);
149 glEnable(GL_TEXTURE_2D);
152 for (y = 0; y < vmeshlast; y++) {
155 for (x = 0; x < hmeshlast; x++) {
159 u0 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x].x);
160 v0 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x].y);
161 u1 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x + 1].x);
162 v1 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x + 1].y);
163 u2 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x + 1].x);
164 v2 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x + 1].y);
165 u3 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x].x);
166 v3 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x].y);
168 glTexCoord2d(((double)u0) * xscale, ((double)v0) * yscale);
169 glVertex3i(x0, y0, 0);
170 glTexCoord2d(((double)u1) * xscale, ((double)v1) * yscale);
171 glVertex3i(x1, y0, 0);
172 glTexCoord2d(((double)u2) * xscale, ((double)v2) * yscale);
173 glVertex3i(x1, y1, 0);
174 glTexCoord2d(((double)u3) * xscale, ((double)v3) * yscale);
175 glVertex3i(x0, y1, 0);
182 static void tmu2_start(MilkymistTMU2State *s)
184 int pbuffer_attrib[6] = {
189 GLX_PRESERVED_CONTENTS,
201 trace_milkymist_tmu2_start();
203 /* Create and set up a suitable OpenGL context */
204 pbuffer_attrib[1] = s->regs[R_DSTHRES];
205 pbuffer_attrib[3] = s->regs[R_DSTVRES];
206 pbuffer = glXCreatePbuffer(s->dpy, s->glx_fb_config, pbuffer_attrib);
207 glXMakeContextCurrent(s->dpy, pbuffer, pbuffer, s->glx_context);
209 /* Fixup endianness. TODO: would it work on BE hosts? */
210 glPixelStorei(GL_UNPACK_SWAP_BYTES, 1);
211 glPixelStorei(GL_PACK_SWAP_BYTES, 1);
214 glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
215 glPixelStorei(GL_PACK_ALIGNMENT, 2);
217 /* Read the QEMU source framebuffer into an OpenGL texture */
218 glGenTextures(1, &texture);
219 glBindTexture(GL_TEXTURE_2D, texture);
220 fb_len = 2ULL * s->regs[R_TEXHRES] * s->regs[R_TEXVRES];
221 fb = cpu_physical_memory_map(s->regs[R_TEXFBUF], &fb_len, 0);
223 glDeleteTextures(1, &texture);
224 glXMakeContextCurrent(s->dpy, None, None, NULL);
225 glXDestroyPbuffer(s->dpy, pbuffer);
228 glTexImage2D(GL_TEXTURE_2D, 0, 3, s->regs[R_TEXHRES], s->regs[R_TEXVRES],
229 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, fb);
230 cpu_physical_memory_unmap(fb, fb_len, 0, fb_len);
232 /* Set up texturing options */
234 * Many cases of TMU2 masking are not supported by OpenGL.
235 * We only implement the most common ones:
236 * - full bilinear filtering vs. nearest texel
237 * - texture clamping vs. texture wrapping
239 if ((s->regs[R_TEXHMASK] & 0x3f) > 0x20) {
240 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
241 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
243 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
244 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
246 if ((s->regs[R_TEXHMASK] >> 6) & s->regs[R_TEXHRES]) {
247 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
249 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
251 if ((s->regs[R_TEXVMASK] >> 6) & s->regs[R_TEXVRES]) {
252 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
254 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
257 /* Translucency and decay */
259 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
260 m = (float)(s->regs[R_BRIGHTNESS] + 1) / 64.0f;
261 glColor4f(m, m, m, (float)(s->regs[R_ALPHA] + 1) / 64.0f);
263 /* Read the QEMU dest. framebuffer into the OpenGL framebuffer */
264 fb_len = 2ULL * s->regs[R_DSTHRES] * s->regs[R_DSTVRES];
265 fb = cpu_physical_memory_map(s->regs[R_DSTFBUF], &fb_len, 0);
267 glDeleteTextures(1, &texture);
268 glXMakeContextCurrent(s->dpy, None, None, NULL);
269 glXDestroyPbuffer(s->dpy, pbuffer);
273 glDrawPixels(s->regs[R_DSTHRES], s->regs[R_DSTVRES], GL_RGB,
274 GL_UNSIGNED_SHORT_5_6_5, fb);
275 cpu_physical_memory_unmap(fb, fb_len, 0, fb_len);
276 glViewport(0, 0, s->regs[R_DSTHRES], s->regs[R_DSTVRES]);
277 glMatrixMode(GL_PROJECTION);
279 glOrtho(0.0, s->regs[R_DSTHRES], 0.0, s->regs[R_DSTVRES], -1.0, 1.0);
280 glMatrixMode(GL_MODELVIEW);
282 /* Map the texture */
283 mesh_len = MESH_MAXSIZE*MESH_MAXSIZE*sizeof(struct vertex);
284 mesh = cpu_physical_memory_map(s->regs[R_VERTICESADDR], &mesh_len, 0);
286 glDeleteTextures(1, &texture);
287 glXMakeContextCurrent(s->dpy, None, None, NULL);
288 glXDestroyPbuffer(s->dpy, pbuffer);
292 tmu2_gl_map((struct vertex *)mesh,
293 s->regs[R_TEXHRES], s->regs[R_TEXVRES],
294 s->regs[R_HMESHLAST], s->regs[R_VMESHLAST],
295 s->regs[R_DSTHOFFSET], s->regs[R_DSTVOFFSET],
296 s->regs[R_DSTSQUAREW], s->regs[R_DSTSQUAREH]);
297 cpu_physical_memory_unmap(mesh, mesh_len, 0, mesh_len);
299 /* Write back the OpenGL framebuffer to the QEMU framebuffer */
300 fb_len = 2ULL * s->regs[R_DSTHRES] * s->regs[R_DSTVRES];
301 fb = cpu_physical_memory_map(s->regs[R_DSTFBUF], &fb_len, 1);
303 glDeleteTextures(1, &texture);
304 glXMakeContextCurrent(s->dpy, None, None, NULL);
305 glXDestroyPbuffer(s->dpy, pbuffer);
309 glReadPixels(0, 0, s->regs[R_DSTHRES], s->regs[R_DSTVRES], GL_RGB,
310 GL_UNSIGNED_SHORT_5_6_5, fb);
311 cpu_physical_memory_unmap(fb, fb_len, 1, fb_len);
313 /* Free OpenGL allocs */
314 glDeleteTextures(1, &texture);
315 glXMakeContextCurrent(s->dpy, None, None, NULL);
316 glXDestroyPbuffer(s->dpy, pbuffer);
318 s->regs[R_CTL] &= ~CTL_START_BUSY;
320 trace_milkymist_tmu2_pulse_irq();
321 qemu_irq_pulse(s->irq);
324 static uint64_t tmu2_read(void *opaque, hwaddr addr,
327 MilkymistTMU2State *s = opaque;
355 error_report("milkymist_tmu2: read access to unknown register 0x"
356 TARGET_FMT_plx, addr << 2);
360 trace_milkymist_tmu2_memory_read(addr << 2, r);
365 static void tmu2_check_registers(MilkymistTMU2State *s)
367 if (s->regs[R_BRIGHTNESS] > MAX_BRIGHTNESS) {
368 error_report("milkymist_tmu2: max brightness is %d", MAX_BRIGHTNESS);
371 if (s->regs[R_ALPHA] > MAX_ALPHA) {
372 error_report("milkymist_tmu2: max alpha is %d", MAX_ALPHA);
375 if (s->regs[R_VERTICESADDR] & 0x07) {
376 error_report("milkymist_tmu2: vertex mesh address has to be 64-bit "
380 if (s->regs[R_TEXFBUF] & 0x01) {
381 error_report("milkymist_tmu2: texture buffer address has to be "
386 static void tmu2_write(void *opaque, hwaddr addr, uint64_t value,
389 MilkymistTMU2State *s = opaque;
391 trace_milkymist_tmu2_memory_write(addr, value);
396 s->regs[addr] = value;
397 if (value & CTL_START_BUSY) {
419 s->regs[addr] = value;
423 error_report("milkymist_tmu2: write access to unknown register 0x"
424 TARGET_FMT_plx, addr << 2);
428 tmu2_check_registers(s);
431 static const MemoryRegionOps tmu2_mmio_ops = {
435 .min_access_size = 4,
436 .max_access_size = 4,
438 .endianness = DEVICE_NATIVE_ENDIAN,
441 static void milkymist_tmu2_reset(DeviceState *d)
443 MilkymistTMU2State *s = MILKYMIST_TMU2(d);
446 for (i = 0; i < R_MAX; i++) {
451 static void milkymist_tmu2_init(Object *obj)
453 MilkymistTMU2State *s = MILKYMIST_TMU2(obj);
454 SysBusDevice *dev = SYS_BUS_DEVICE(obj);
456 sysbus_init_irq(dev, &s->irq);
458 memory_region_init_io(&s->regs_region, obj, &tmu2_mmio_ops, s,
459 "milkymist-tmu2", R_MAX * 4);
460 sysbus_init_mmio(dev, &s->regs_region);
463 static void milkymist_tmu2_realize(DeviceState *dev, Error **errp)
465 MilkymistTMU2State *s = MILKYMIST_TMU2(dev);
467 if (tmu2_glx_init(s)) {
468 error_setg(errp, "tmu2_glx_init failed");
472 static const VMStateDescription vmstate_milkymist_tmu2 = {
473 .name = "milkymist-tmu2",
475 .minimum_version_id = 1,
476 .fields = (VMStateField[]) {
477 VMSTATE_UINT32_ARRAY(regs, MilkymistTMU2State, R_MAX),
478 VMSTATE_END_OF_LIST()
482 static void milkymist_tmu2_class_init(ObjectClass *klass, void *data)
484 DeviceClass *dc = DEVICE_CLASS(klass);
486 dc->realize = milkymist_tmu2_realize;
487 dc->reset = milkymist_tmu2_reset;
488 dc->vmsd = &vmstate_milkymist_tmu2;
491 static const TypeInfo milkymist_tmu2_info = {
492 .name = TYPE_MILKYMIST_TMU2,
493 .parent = TYPE_SYS_BUS_DEVICE,
494 .instance_size = sizeof(MilkymistTMU2State),
495 .instance_init = milkymist_tmu2_init,
496 .class_init = milkymist_tmu2_class_init,
499 static void milkymist_tmu2_register_types(void)
501 type_register_static(&milkymist_tmu2_info);
504 type_init(milkymist_tmu2_register_types)
506 DeviceState *milkymist_tmu2_create(hwaddr base, qemu_irq irq)
510 GLXFBConfig *configs;
512 int ver_major, ver_minor;
514 /* check that GLX will work */
515 d = XOpenDisplay(NULL);
520 if (!glXQueryVersion(d, &ver_major, &ver_minor)) {
522 * Yeah, sometimes getting the GLX version can fail.
529 if ((ver_major < 1) || ((ver_major == 1) && (ver_minor < 3))) {
530 printf("Your GLX version is %d.%d,"
531 "but TMU emulation needs at least 1.3. TMU disabled.\n",
532 ver_major, ver_minor);
537 configs = glXChooseFBConfig(d, 0, glx_fbconfig_attr, &nelements);
538 if (configs == NULL) {
546 dev = qdev_create(NULL, TYPE_MILKYMIST_TMU2);
547 qdev_init_nofail(dev);
548 sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base);
549 sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, irq);