| /* |
| * 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/hw.h" |
| #include "hw/sysbus.h" |
| #include "trace.h" |
| #include "qemu/error-report.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; |
| 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 = 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, 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 = 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(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 void milkymist_tmu2_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); |
| |
| k->init = milkymist_tmu2_init; |
| dc->reset = milkymist_tmu2_reset; |
| dc->vmsd = &vmstate_milkymist_tmu2; |
| } |
| |
| static const TypeInfo milkymist_tmu2_info = { |
| .name = "milkymist-tmu2", |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(MilkymistTMU2State), |
| .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) |