/* * 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)