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qemu/hw/display/milkymist-tmu2.c

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/*
* 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://milkymist.walle.cc/socdoc/tmu2.pdf
*
*/
#include "qemu/osdep.h"
#include "hw/hw.h"
#include "hw/sysbus.h"
#include "trace.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include <X11/Xlib.h>
#include <epoxy/gl.h>
#include <epoxy/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;
#define TYPE_MILKYMIST_TMU2 "milkymist-tmu2"
#define MILKYMIST_TMU2(obj) \
OBJECT_CHECK(MilkymistTMU2State, (obj), TYPE_MILKYMIST_TMU2)
struct MilkymistTMU2State {
SysBusDevice parent_obj;
MemoryRegion regs_region;
Chardev *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;
hwaddr fb_len;
void *mesh;
hwaddr 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 = 2ULL * 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 = 2ULL * 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 = 2ULL * 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, hwaddr 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, hwaddr 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 = MILKYMIST_TMU2(d);
int i;
for (i = 0; i < R_MAX; i++) {
s->regs[i] = 0;
}
}
static void milkymist_tmu2_init(Object *obj)
{
MilkymistTMU2State *s = MILKYMIST_TMU2(obj);
SysBusDevice *dev = SYS_BUS_DEVICE(obj);
sysbus_init_irq(dev, &s->irq);
memory_region_init_io(&s->regs_region, obj, &tmu2_mmio_ops, s,
"milkymist-tmu2", R_MAX * 4);
sysbus_init_mmio(dev, &s->regs_region);
}
static void milkymist_tmu2_realize(DeviceState *dev, Error **errp)
{
MilkymistTMU2State *s = MILKYMIST_TMU2(dev);
if (tmu2_glx_init(s)) {
error_setg(errp, "tmu2_glx_init failed");
}
}
static const VMStateDescription vmstate_milkymist_tmu2 = {
.name = "milkymist-tmu2",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, MilkymistTMU2State, R_MAX),
VMSTATE_END_OF_LIST()
}
};
static void milkymist_tmu2_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = milkymist_tmu2_realize;
dc->reset = milkymist_tmu2_reset;
dc->vmsd = &vmstate_milkymist_tmu2;
}
static const TypeInfo milkymist_tmu2_info = {
.name = TYPE_MILKYMIST_TMU2,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(MilkymistTMU2State),
.instance_init = milkymist_tmu2_init,
.class_init = milkymist_tmu2_class_init,
};
static void milkymist_tmu2_register_types(void)
{
type_register_static(&milkymist_tmu2_info);
}
type_init(milkymist_tmu2_register_types)
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