summaryrefslogtreecommitdiff
path: root/hw/milkymist-tmu2.c
blob: aad0ed06d42b1d6c5f55e0db7ba2f8910dc82d86 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
/*
 *  QEMU model of the Milkymist texture mapping unit.
 *
 *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
 *  Copyright (c) 2010 Sebastien Bourdeauducq
 *                       <sebastien.bourdeauducq@lekernel.net>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 *
 *
 * Specification available at:
 *   http://www.milkymist.org/socdoc/tmu2.pdf
 *
 */

#include "hw.h"
#include "sysbus.h"
#include "trace.h"
#include "qemu-error.h"

#include <X11/Xlib.h>
#include <GL/gl.h>
#include <GL/glx.h>

enum {
    R_CTL = 0,
    R_HMESHLAST,
    R_VMESHLAST,
    R_BRIGHTNESS,
    R_CHROMAKEY,
    R_VERTICESADDR,
    R_TEXFBUF,
    R_TEXHRES,
    R_TEXVRES,
    R_TEXHMASK,
    R_TEXVMASK,
    R_DSTFBUF,
    R_DSTHRES,
    R_DSTVRES,
    R_DSTHOFFSET,
    R_DSTVOFFSET,
    R_DSTSQUAREW,
    R_DSTSQUAREH,
    R_ALPHA,
    R_MAX
};

enum {
    CTL_START_BUSY  = (1<<0),
    CTL_CHROMAKEY   = (1<<1),
};

enum {
    MAX_BRIGHTNESS = 63,
    MAX_ALPHA      = 63,
};

enum {
    MESH_MAXSIZE = 128,
};

struct vertex {
    int x;
    int y;
} QEMU_PACKED;

struct MilkymistTMU2State {
    SysBusDevice busdev;
    MemoryRegion regs_region;
    CharDriverState *chr;
    qemu_irq irq;

    uint32_t regs[R_MAX];

    Display *dpy;
    GLXFBConfig glx_fb_config;
    GLXContext glx_context;
};
typedef struct MilkymistTMU2State MilkymistTMU2State;

static const int glx_fbconfig_attr[] = {
    GLX_GREEN_SIZE, 5,
    GLX_GREEN_SIZE, 6,
    GLX_BLUE_SIZE, 5,
    None
};

static int tmu2_glx_init(MilkymistTMU2State *s)
{
    GLXFBConfig *configs;
    int nelements;

    s->dpy = XOpenDisplay(NULL); /* FIXME: call XCloseDisplay() */
    if (s->dpy == NULL) {
        return 1;
    }

    configs = glXChooseFBConfig(s->dpy, 0, glx_fbconfig_attr, &nelements);
    if (configs == NULL) {
        return 1;
    }

    s->glx_fb_config = *configs;
    XFree(configs);

    /* FIXME: call glXDestroyContext() */
    s->glx_context = glXCreateNewContext(s->dpy, s->glx_fb_config,
            GLX_RGBA_TYPE, NULL, 1);
    if (s->glx_context == NULL) {
        return 1;
    }

    return 0;
}

static void tmu2_gl_map(struct vertex *mesh, int texhres, int texvres,
        int hmeshlast, int vmeshlast, int ho, int vo, int sw, int sh)
{
    int x, y;
    int x0, y0, x1, y1;
    int u0, v0, u1, v1, u2, v2, u3, v3;
    double xscale = 1.0 / ((double)(64 * texhres));
    double yscale = 1.0 / ((double)(64 * texvres));

    glLoadIdentity();
    glTranslatef(ho, vo, 0);
    glEnable(GL_TEXTURE_2D);
    glBegin(GL_QUADS);

    for (y = 0; y < vmeshlast; y++) {
        y0 = y * sh;
        y1 = y0 + sh;
        for (x = 0; x < hmeshlast; x++) {
            x0 = x * sw;
            x1 = x0 + sw;

            u0 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x].x);
            v0 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x].y);
            u1 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x + 1].x);
            v1 = be32_to_cpu(mesh[MESH_MAXSIZE * y + x + 1].y);
            u2 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x + 1].x);
            v2 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x + 1].y);
            u3 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x].x);
            v3 = be32_to_cpu(mesh[MESH_MAXSIZE * (y + 1) + x].y);

            glTexCoord2d(((double)u0) * xscale, ((double)v0) * yscale);
            glVertex3i(x0, y0, 0);
            glTexCoord2d(((double)u1) * xscale, ((double)v1) * yscale);
            glVertex3i(x1, y0, 0);
            glTexCoord2d(((double)u2) * xscale, ((double)v2) * yscale);
            glVertex3i(x1, y1, 0);
            glTexCoord2d(((double)u3) * xscale, ((double)v3) * yscale);
            glVertex3i(x0, y1, 0);
        }
    }

    glEnd();
}

static void tmu2_start(MilkymistTMU2State *s)
{
    int pbuffer_attrib[6] = {
        GLX_PBUFFER_WIDTH,
        0,
        GLX_PBUFFER_HEIGHT,
        0,
        GLX_PRESERVED_CONTENTS,
        True
    };

    GLXPbuffer pbuffer;
    GLuint texture;
    void *fb;
    target_phys_addr_t fb_len;
    void *mesh;
    target_phys_addr_t mesh_len;
    float m;

    trace_milkymist_tmu2_start();

    /* Create and set up a suitable OpenGL context */
    pbuffer_attrib[1] = s->regs[R_DSTHRES];
    pbuffer_attrib[3] = s->regs[R_DSTVRES];
    pbuffer = glXCreatePbuffer(s->dpy, s->glx_fb_config, pbuffer_attrib);
    glXMakeContextCurrent(s->dpy, pbuffer, pbuffer, s->glx_context);

    /* Fixup endianness. TODO: would it work on BE hosts? */
    glPixelStorei(GL_UNPACK_SWAP_BYTES, 1);
    glPixelStorei(GL_PACK_SWAP_BYTES, 1);

    /* Row alignment */
    glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
    glPixelStorei(GL_PACK_ALIGNMENT, 2);

    /* Read the QEMU source framebuffer into an OpenGL texture */
    glGenTextures(1, &texture);
    glBindTexture(GL_TEXTURE_2D, texture);
    fb_len = 2*s->regs[R_TEXHRES]*s->regs[R_TEXVRES];
    fb = cpu_physical_memory_map(s->regs[R_TEXFBUF], &fb_len, 0);
    if (fb == NULL) {
        glDeleteTextures(1, &texture);
        glXMakeContextCurrent(s->dpy, None, None, NULL);
        glXDestroyPbuffer(s->dpy, pbuffer);
        return;
    }
    glTexImage2D(GL_TEXTURE_2D, 0, 3, s->regs[R_TEXHRES], s->regs[R_TEXVRES],
            0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, fb);
    cpu_physical_memory_unmap(fb, fb_len, 0, fb_len);

    /* Set up texturing options */
    /* WARNING:
     * Many cases of TMU2 masking are not supported by OpenGL.
     * We only implement the most common ones:
     *  - full bilinear filtering vs. nearest texel
     *  - texture clamping vs. texture wrapping
     */
    if ((s->regs[R_TEXHMASK] & 0x3f) > 0x20) {
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    } else {
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    }
    if ((s->regs[R_TEXHMASK] >> 6) & s->regs[R_TEXHRES]) {
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
    } else {
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    }
    if ((s->regs[R_TEXVMASK] >> 6) & s->regs[R_TEXVRES]) {
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
    } else {
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    }

    /* Translucency and decay */
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    m = (float)(s->regs[R_BRIGHTNESS] + 1) / 64.0f;
    glColor4f(m, m, m, (float)(s->regs[R_ALPHA] + 1) / 64.0f);

    /* Read the QEMU dest. framebuffer into the OpenGL framebuffer */
    fb_len = 2 * s->regs[R_DSTHRES] * s->regs[R_DSTVRES];
    fb = cpu_physical_memory_map(s->regs[R_DSTFBUF], &fb_len, 0);
    if (fb == NULL) {
        glDeleteTextures(1, &texture);
        glXMakeContextCurrent(s->dpy, None, None, NULL);
        glXDestroyPbuffer(s->dpy, pbuffer);
        return;
    }

    glDrawPixels(s->regs[R_DSTHRES], s->regs[R_DSTVRES], GL_RGB,
            GL_UNSIGNED_SHORT_5_6_5, fb);
    cpu_physical_memory_unmap(fb, fb_len, 0, fb_len);
    glViewport(0, 0, s->regs[R_DSTHRES], s->regs[R_DSTVRES]);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0.0, s->regs[R_DSTHRES], 0.0, s->regs[R_DSTVRES], -1.0, 1.0);
    glMatrixMode(GL_MODELVIEW);

    /* Map the texture */
    mesh_len = MESH_MAXSIZE*MESH_MAXSIZE*sizeof(struct vertex);
    mesh = cpu_physical_memory_map(s->regs[R_VERTICESADDR], &mesh_len, 0);
    if (mesh == NULL) {
        glDeleteTextures(1, &texture);
        glXMakeContextCurrent(s->dpy, None, None, NULL);
        glXDestroyPbuffer(s->dpy, pbuffer);
        return;
    }

    tmu2_gl_map((struct vertex *)mesh,
        s->regs[R_TEXHRES], s->regs[R_TEXVRES],
        s->regs[R_HMESHLAST], s->regs[R_VMESHLAST],
        s->regs[R_DSTHOFFSET], s->regs[R_DSTVOFFSET],
        s->regs[R_DSTSQUAREW], s->regs[R_DSTSQUAREH]);
    cpu_physical_memory_unmap(mesh, mesh_len, 0, mesh_len);

    /* Write back the OpenGL framebuffer to the QEMU framebuffer */
    fb_len = 2 * s->regs[R_DSTHRES] * s->regs[R_DSTVRES];
    fb = cpu_physical_memory_map(s->regs[R_DSTFBUF], &fb_len, 1);
    if (fb == NULL) {
        glDeleteTextures(1, &texture);
        glXMakeContextCurrent(s->dpy, None, None, NULL);
        glXDestroyPbuffer(s->dpy, pbuffer);
        return;
    }

    glReadPixels(0, 0, s->regs[R_DSTHRES], s->regs[R_DSTVRES], GL_RGB,
            GL_UNSIGNED_SHORT_5_6_5, fb);
    cpu_physical_memory_unmap(fb, fb_len, 1, fb_len);

    /* Free OpenGL allocs */
    glDeleteTextures(1, &texture);
    glXMakeContextCurrent(s->dpy, None, None, NULL);
    glXDestroyPbuffer(s->dpy, pbuffer);

    s->regs[R_CTL] &= ~CTL_START_BUSY;

    trace_milkymist_tmu2_pulse_irq();
    qemu_irq_pulse(s->irq);
}

static uint64_t tmu2_read(void *opaque, target_phys_addr_t addr,
                          unsigned size)
{
    MilkymistTMU2State *s = opaque;
    uint32_t r = 0;

    addr >>= 2;
    switch (addr) {
    case R_CTL:
    case R_HMESHLAST:
    case R_VMESHLAST:
    case R_BRIGHTNESS:
    case R_CHROMAKEY:
    case R_VERTICESADDR:
    case R_TEXFBUF:
    case R_TEXHRES:
    case R_TEXVRES:
    case R_TEXHMASK:
    case R_TEXVMASK:
    case R_DSTFBUF:
    case R_DSTHRES:
    case R_DSTVRES:
    case R_DSTHOFFSET:
    case R_DSTVOFFSET:
    case R_DSTSQUAREW:
    case R_DSTSQUAREH:
    case R_ALPHA:
        r = s->regs[addr];
        break;

    default:
        error_report("milkymist_tmu2: read access to unknown register 0x"
                TARGET_FMT_plx, addr << 2);
        break;
    }

    trace_milkymist_tmu2_memory_read(addr << 2, r);

    return r;
}

static void tmu2_check_registers(MilkymistTMU2State *s)
{
    if (s->regs[R_BRIGHTNESS] > MAX_BRIGHTNESS) {
        error_report("milkymist_tmu2: max brightness is %d", MAX_BRIGHTNESS);
    }

    if (s->regs[R_ALPHA] > MAX_ALPHA) {
        error_report("milkymist_tmu2: max alpha is %d", MAX_ALPHA);
    }

    if (s->regs[R_VERTICESADDR] & 0x07) {
        error_report("milkymist_tmu2: vertex mesh address has to be 64-bit "
                "aligned");
    }

    if (s->regs[R_TEXFBUF] & 0x01) {
        error_report("milkymist_tmu2: texture buffer address has to be "
                "16-bit aligned");
    }
}

static void tmu2_write(void *opaque, target_phys_addr_t addr, uint64_t value,
                       unsigned size)
{
    MilkymistTMU2State *s = opaque;

    trace_milkymist_tmu2_memory_write(addr, value);

    addr >>= 2;
    switch (addr) {
    case R_CTL:
        s->regs[addr] = value;
        if (value & CTL_START_BUSY) {
            tmu2_start(s);
        }
        break;
    case R_BRIGHTNESS:
    case R_HMESHLAST:
    case R_VMESHLAST:
    case R_CHROMAKEY:
    case R_VERTICESADDR:
    case R_TEXFBUF:
    case R_TEXHRES:
    case R_TEXVRES:
    case R_TEXHMASK:
    case R_TEXVMASK:
    case R_DSTFBUF:
    case R_DSTHRES:
    case R_DSTVRES:
    case R_DSTHOFFSET:
    case R_DSTVOFFSET:
    case R_DSTSQUAREW:
    case R_DSTSQUAREH:
    case R_ALPHA:
        s->regs[addr] = value;
        break;

    default:
        error_report("milkymist_tmu2: write access to unknown register 0x"
                TARGET_FMT_plx, addr << 2);
        break;
    }

    tmu2_check_registers(s);
}

static const MemoryRegionOps tmu2_mmio_ops = {
    .read = tmu2_read,
    .write = tmu2_write,
    .valid = {
        .min_access_size = 4,
        .max_access_size = 4,
    },
    .endianness = DEVICE_NATIVE_ENDIAN,
};

static void milkymist_tmu2_reset(DeviceState *d)
{
    MilkymistTMU2State *s = container_of(d, MilkymistTMU2State, busdev.qdev);
    int i;

    for (i = 0; i < R_MAX; i++) {
        s->regs[i] = 0;
    }
}

static int milkymist_tmu2_init(SysBusDevice *dev)
{
    MilkymistTMU2State *s = FROM_SYSBUS(typeof(*s), dev);

    if (tmu2_glx_init(s)) {
        return 1;
    }

    sysbus_init_irq(dev, &s->irq);

    memory_region_init_io(&s->regs_region, &tmu2_mmio_ops, s,
            "milkymist-tmu2", R_MAX * 4);
    sysbus_init_mmio_region(dev, &s->regs_region);

    return 0;
}

static const VMStateDescription vmstate_milkymist_tmu2 = {
    .name = "milkymist-tmu2",
    .version_id = 1,
    .minimum_version_id = 1,
    .minimum_version_id_old = 1,
    .fields      = (VMStateField[]) {
        VMSTATE_UINT32_ARRAY(regs, MilkymistTMU2State, R_MAX),
        VMSTATE_END_OF_LIST()
    }
};

static SysBusDeviceInfo milkymist_tmu2_info = {
    .init = milkymist_tmu2_init,
    .qdev.name  = "milkymist-tmu2",
    .qdev.size  = sizeof(MilkymistTMU2State),
    .qdev.vmsd  = &vmstate_milkymist_tmu2,
    .qdev.reset = milkymist_tmu2_reset,
};

static void milkymist_tmu2_register(void)
{
    sysbus_register_withprop(&milkymist_tmu2_info);
}

device_init(milkymist_tmu2_register)