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://www.milkymist.org/socdoc/tmu2.pdf
30 #include "qemu-error.h"
60 CTL_START_BUSY = (1<<0),
61 CTL_CHROMAKEY = (1<<1),
78 struct MilkymistTMU2State {
80 MemoryRegion regs_region;
87 GLXFBConfig glx_fb_config;
88 GLXContext glx_context;
90 typedef struct MilkymistTMU2State MilkymistTMU2State;
92 static const int glx_fbconfig_attr[] = {
99 static int tmu2_glx_init(MilkymistTMU2State *s)
101 GLXFBConfig *configs;
104 s->dpy = XOpenDisplay(NULL); /* FIXME: call XCloseDisplay() */
105 if (s->dpy == NULL) {
109 configs = glXChooseFBConfig(s->dpy, 0, glx_fbconfig_attr, &nelements);
110 if (configs == NULL) {
114 s->glx_fb_config = *configs;
117 /* FIXME: call glXDestroyContext() */
118 s->glx_context = glXCreateNewContext(s->dpy, s->glx_fb_config,
119 GLX_RGBA_TYPE, NULL, 1);
120 if (s->glx_context == NULL) {
127 static void tmu2_gl_map(struct vertex *mesh, int texhres, int texvres,
128 int hmeshlast, int vmeshlast, int ho, int vo, int sw, int sh)
132 int u0, v0, u1, v1, u2, v2, u3, v3;
133 double xscale = 1.0 / ((double)(64 * texhres));
134 double yscale = 1.0 / ((double)(64 * texvres));
137 glTranslatef(ho, vo, 0);
138 glEnable(GL_TEXTURE_2D);
141 for (y = 0; y < vmeshlast; y++) {
144 for (x = 0; x < hmeshlast; x++) {
148 u0 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x].x);
149 v0 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x].y);
150 u1 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x + 1].x);
151 v1 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x + 1].y);
152 u2 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x + 1].x);
153 v2 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x + 1].y);
154 u3 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x].x);
155 v3 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x].y);
157 glTexCoord2d(((double)u0) * xscale, ((double)v0) * yscale);
158 glVertex3i(x0, y0, 0);
159 glTexCoord2d(((double)u1) * xscale, ((double)v1) * yscale);
160 glVertex3i(x1, y0, 0);
161 glTexCoord2d(((double)u2) * xscale, ((double)v2) * yscale);
162 glVertex3i(x1, y1, 0);
163 glTexCoord2d(((double)u3) * xscale, ((double)v3) * yscale);
164 glVertex3i(x0, y1, 0);
171 static void tmu2_start(MilkymistTMU2State *s)
173 int pbuffer_attrib[6] = {
178 GLX_PRESERVED_CONTENTS,
185 target_phys_addr_t fb_len;
187 target_phys_addr_t mesh_len;
190 trace_milkymist_tmu2_start();
192 /* Create and set up a suitable OpenGL context */
193 pbuffer_attrib[1] = s->regs[R_DSTHRES];
194 pbuffer_attrib[3] = s->regs[R_DSTVRES];
195 pbuffer = glXCreatePbuffer(s->dpy, s->glx_fb_config, pbuffer_attrib);
196 glXMakeContextCurrent(s->dpy, pbuffer, pbuffer, s->glx_context);
198 /* Fixup endianness. TODO: would it work on BE hosts? */
199 glPixelStorei(GL_UNPACK_SWAP_BYTES, 1);
200 glPixelStorei(GL_PACK_SWAP_BYTES, 1);
203 glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
204 glPixelStorei(GL_PACK_ALIGNMENT, 2);
206 /* Read the QEMU source framebuffer into an OpenGL texture */
207 glGenTextures(1, &texture);
208 glBindTexture(GL_TEXTURE_2D, texture);
209 fb_len = 2*s->regs[R_TEXHRES]*s->regs[R_TEXVRES];
210 fb = cpu_physical_memory_map(s->regs[R_TEXFBUF], &fb_len, 0);
212 glDeleteTextures(1, &texture);
213 glXMakeContextCurrent(s->dpy, None, None, NULL);
214 glXDestroyPbuffer(s->dpy, pbuffer);
217 glTexImage2D(GL_TEXTURE_2D, 0, 3, s->regs[R_TEXHRES], s->regs[R_TEXVRES],
218 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, fb);
219 cpu_physical_memory_unmap(fb, fb_len, 0, fb_len);
221 /* Set up texturing options */
223 * Many cases of TMU2 masking are not supported by OpenGL.
224 * We only implement the most common ones:
225 * - full bilinear filtering vs. nearest texel
226 * - texture clamping vs. texture wrapping
228 if ((s->regs[R_TEXHMASK] & 0x3f) > 0x20) {
229 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
230 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
232 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
233 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
235 if ((s->regs[R_TEXHMASK] >> 6) & s->regs[R_TEXHRES]) {
236 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
238 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
240 if ((s->regs[R_TEXVMASK] >> 6) & s->regs[R_TEXVRES]) {
241 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
243 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
246 /* Translucency and decay */
248 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
249 m = (float)(s->regs[R_BRIGHTNESS] + 1) / 64.0f;
250 glColor4f(m, m, m, (float)(s->regs[R_ALPHA] + 1) / 64.0f);
252 /* Read the QEMU dest. framebuffer into the OpenGL framebuffer */
253 fb_len = 2 * s->regs[R_DSTHRES] * s->regs[R_DSTVRES];
254 fb = cpu_physical_memory_map(s->regs[R_DSTFBUF], &fb_len, 0);
256 glDeleteTextures(1, &texture);
257 glXMakeContextCurrent(s->dpy, None, None, NULL);
258 glXDestroyPbuffer(s->dpy, pbuffer);
262 glDrawPixels(s->regs[R_DSTHRES], s->regs[R_DSTVRES], GL_RGB,
263 GL_UNSIGNED_SHORT_5_6_5, fb);
264 cpu_physical_memory_unmap(fb, fb_len, 0, fb_len);
265 glViewport(0, 0, s->regs[R_DSTHRES], s->regs[R_DSTVRES]);
266 glMatrixMode(GL_PROJECTION);
268 glOrtho(0.0, s->regs[R_DSTHRES], 0.0, s->regs[R_DSTVRES], -1.0, 1.0);
269 glMatrixMode(GL_MODELVIEW);
271 /* Map the texture */
272 mesh_len = MESH_MAXSIZE*MESH_MAXSIZE*sizeof(struct vertex);
273 mesh = cpu_physical_memory_map(s->regs[R_VERTICESADDR], &mesh_len, 0);
275 glDeleteTextures(1, &texture);
276 glXMakeContextCurrent(s->dpy, None, None, NULL);
277 glXDestroyPbuffer(s->dpy, pbuffer);
281 tmu2_gl_map((struct vertex *)mesh,
282 s->regs[R_TEXHRES], s->regs[R_TEXVRES],
283 s->regs[R_HMESHLAST], s->regs[R_VMESHLAST],
284 s->regs[R_DSTHOFFSET], s->regs[R_DSTVOFFSET],
285 s->regs[R_DSTSQUAREW], s->regs[R_DSTSQUAREH]);
286 cpu_physical_memory_unmap(mesh, mesh_len, 0, mesh_len);
288 /* Write back the OpenGL framebuffer to the QEMU framebuffer */
289 fb_len = 2 * s->regs[R_DSTHRES] * s->regs[R_DSTVRES];
290 fb = cpu_physical_memory_map(s->regs[R_DSTFBUF], &fb_len, 1);
292 glDeleteTextures(1, &texture);
293 glXMakeContextCurrent(s->dpy, None, None, NULL);
294 glXDestroyPbuffer(s->dpy, pbuffer);
298 glReadPixels(0, 0, s->regs[R_DSTHRES], s->regs[R_DSTVRES], GL_RGB,
299 GL_UNSIGNED_SHORT_5_6_5, fb);
300 cpu_physical_memory_unmap(fb, fb_len, 1, fb_len);
302 /* Free OpenGL allocs */
303 glDeleteTextures(1, &texture);
304 glXMakeContextCurrent(s->dpy, None, None, NULL);
305 glXDestroyPbuffer(s->dpy, pbuffer);
307 s->regs[R_CTL] &= ~CTL_START_BUSY;
309 trace_milkymist_tmu2_pulse_irq();
310 qemu_irq_pulse(s->irq);
313 static uint64_t tmu2_read(void *opaque, target_phys_addr_t addr,
316 MilkymistTMU2State *s = opaque;
344 error_report("milkymist_tmu2: read access to unknown register 0x"
345 TARGET_FMT_plx, addr << 2);
349 trace_milkymist_tmu2_memory_read(addr << 2, r);
354 static void tmu2_check_registers(MilkymistTMU2State *s)
356 if (s->regs[R_BRIGHTNESS] > MAX_BRIGHTNESS) {
357 error_report("milkymist_tmu2: max brightness is %d", MAX_BRIGHTNESS);
360 if (s->regs[R_ALPHA] > MAX_ALPHA) {
361 error_report("milkymist_tmu2: max alpha is %d", MAX_ALPHA);
364 if (s->regs[R_VERTICESADDR] & 0x07) {
365 error_report("milkymist_tmu2: vertex mesh address has to be 64-bit "
369 if (s->regs[R_TEXFBUF] & 0x01) {
370 error_report("milkymist_tmu2: texture buffer address has to be "
375 static void tmu2_write(void *opaque, target_phys_addr_t addr, uint64_t value,
378 MilkymistTMU2State *s = opaque;
380 trace_milkymist_tmu2_memory_write(addr, value);
385 s->regs[addr] = value;
386 if (value & CTL_START_BUSY) {
408 s->regs[addr] = value;
412 error_report("milkymist_tmu2: write access to unknown register 0x"
413 TARGET_FMT_plx, addr << 2);
417 tmu2_check_registers(s);
420 static const MemoryRegionOps tmu2_mmio_ops = {
424 .min_access_size = 4,
425 .max_access_size = 4,
427 .endianness = DEVICE_NATIVE_ENDIAN,
430 static void milkymist_tmu2_reset(DeviceState *d)
432 MilkymistTMU2State *s = container_of(d, MilkymistTMU2State, busdev.qdev);
435 for (i = 0; i < R_MAX; i++) {
440 static int milkymist_tmu2_init(SysBusDevice *dev)
442 MilkymistTMU2State *s = FROM_SYSBUS(typeof(*s), dev);
444 if (tmu2_glx_init(s)) {
448 sysbus_init_irq(dev, &s->irq);
450 memory_region_init_io(&s->regs_region, &tmu2_mmio_ops, s,
451 "milkymist-tmu2", R_MAX * 4);
452 sysbus_init_mmio_region(dev, &s->regs_region);
457 static const VMStateDescription vmstate_milkymist_tmu2 = {
458 .name = "milkymist-tmu2",
460 .minimum_version_id = 1,
461 .minimum_version_id_old = 1,
462 .fields = (VMStateField[]) {
463 VMSTATE_UINT32_ARRAY(regs, MilkymistTMU2State, R_MAX),
464 VMSTATE_END_OF_LIST()
468 static SysBusDeviceInfo milkymist_tmu2_info = {
469 .init = milkymist_tmu2_init,
470 .qdev.name = "milkymist-tmu2",
471 .qdev.size = sizeof(MilkymistTMU2State),
472 .qdev.vmsd = &vmstate_milkymist_tmu2,
473 .qdev.reset = milkymist_tmu2_reset,
476 static void milkymist_tmu2_register(void)
478 sysbus_register_withprop(&milkymist_tmu2_info);
481 device_init(milkymist_tmu2_register)