--- /dev/null
+/*
+ * 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;
+} __attribute__((packed));
+
+struct MilkymistTMU2State {
+ SysBusDevice busdev;
+ 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 uint32_t tmu2_read(void *opaque, target_phys_addr_t addr)
+{
+ 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\n", MAX_BRIGHTNESS);
+ }
+
+ if (s->regs[R_ALPHA] > MAX_ALPHA) {
+ error_report("milkymist_tmu2: max alpha is %d\n", MAX_ALPHA);
+ }
+
+ if (s->regs[R_VERTICESADDR] & 0x07) {
+ error_report("milkymist_tmu2: vertex mesh address has to be 64-bit "
+ "aligned\n");
+ }
+
+ if (s->regs[R_TEXFBUF] & 0x01) {
+ error_report("milkymist_tmu2: texture buffer address has to be "
+ "16-bit aligned\n");
+ }
+}
+
+static void tmu2_write(void *opaque, target_phys_addr_t addr, uint32_t value)
+{
+ 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 CPUReadMemoryFunc * const tmu2_read_fn[] = {
+ NULL,
+ NULL,
+ &tmu2_read,
+};
+
+static CPUWriteMemoryFunc * const tmu2_write_fn[] = {
+ NULL,
+ NULL,
+ &tmu2_write,
+};
+
+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);
+ int tmu2_regs;
+
+ if (tmu2_glx_init(s)) {
+ return 1;
+ }
+
+ sysbus_init_irq(dev, &s->irq);
+
+ tmu2_regs = cpu_register_io_memory(tmu2_read_fn, tmu2_write_fn, s,
+ DEVICE_NATIVE_ENDIAN);
+ sysbus_init_mmio(dev, R_MAX * 4, tmu2_regs);
+
+ 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)
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