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// SPDX-License-Identifier: BSD-3-Clause
/*
* gl_frames.c - render animated frames with direct GL (GLX pbuffer) on the
* guest's NVIDIA vGPU and publish them into the ivshmem (kvmfr) BAR so the
* host can see what the GL client actually rendered.
*
* This is the GL sibling of tools/cuda-ab/frame_producer.cu: the transport
* (guest GPU -> guest sysmem -> ivshmem -> host frame_reader.py) is identical,
* but the pixels come from the direct-GL client channel instead of CUDA.
* The pbuffer avoids the X window draw path that wedges the X server.
*
* Layout at BAR offset 0x100000 (same as frame_producer.cu):
* struct frame_hdr { magic, version, width, height, stride, format, seq }
* then width*height*4 bytes of RGBA8.
*
* Usage: sudo ./gl_frames [frames] [width] [height] [fps]
* Prints: FRAME seq=<n> ms=<render+readback ms>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <time.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <glob.h>
#include <math.h>
#include <X11/Xlib.h>
#include <GL/glx.h>
#include <GL/gl.h>
#define FRAME_OFFSET 0x100000UL
#define HDR_MAGIC 0x4b564d46u /* "FMVK" little-endian-ish */
#define BAR_BYTES (128UL << 20)
#define BAR_PATH_DEF "/sys/bus/pci/devices/0000:00:04.0/resource2"
struct frame_hdr {
uint32_t magic;
uint32_t version;
uint32_t width;
uint32_t height;
uint32_t stride;
uint32_t format; /* 0 = RGBA8 */
uint32_t seq;
uint32_t reserved;
uint64_t timestamp_ns;
};
/*
* The ivshmem kvmfr device moves with the QEMU topology (it was 00:03.0 in an
* older launch, 00:04.0 in the current one). Discover the 128 MiB BAR instead
* of hardcoding a slot; GL_FRAMES_BAR overrides for debugging.
*/
static const char *find_bar(char *buf, size_t len)
{
glob_t g;
size_t i;
const char *hit = NULL;
if (glob("/sys/bus/pci/devices/*/resource2", 0, NULL, &g) != 0)
return NULL;
for (i = 0; i < g.gl_pathc; i++) {
struct stat st;
if (stat(g.gl_pathv[i], &st) == 0 &&
(unsigned long long)st.st_size == BAR_BYTES) {
snprintf(buf, len, "%s", g.gl_pathv[i]);
hit = buf;
break;
}
}
globfree(&g);
return hit;
}
static uint64_t now_ns(void)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (uint64_t)ts.tv_sec * 1000000000ull + ts.tv_nsec;
}
static void draw_frame(int f, int w, int h)
{
float a = (float)f * 0.15f;
int i;
glViewport(0, 0, w, h);
glClearColor(0.05f, 0.05f, 0.10f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
for (i = 0; i < 8; i++) {
float t = a + (float)i * 0.78539816339f;
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.2f + 0.09f * i, 0.1f);
glVertex2f(0.0f, 0.0f);
glColor3f(0.1f, 0.9f, 0.3f);
glVertex2f(0.75f * cosf(t), 0.75f * sinf(t));
glColor3f(0.2f, 0.3f, 1.0f);
glVertex2f(0.55f * cosf(t + 0.5f),
0.55f * sinf(t + 0.5f));
glEnd();
}
glFinish();
}
int main(int argc, char **argv)
{
int frames = argc > 1 ? atoi(argv[1]) : 30;
int w = argc > 2 ? atoi(argv[2]) : 640;
int h = argc > 3 ? atoi(argv[3]) : 480;
int fps = argc > 4 ? atoi(argv[4]) : 5;
static int attribs[] = {
GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT,
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_RED_SIZE, 8, GLX_GREEN_SIZE, 8, GLX_BLUE_SIZE, 8,
GLX_ALPHA_SIZE, 8,
None
};
GLXFBConfig *fb;
GLXPbuffer pb;
XVisualInfo *vi;
GLXContext ctx;
Display *d;
int scr, n = 0, fd, i;
unsigned char *bar, *px;
struct frame_hdr *hdr;
volatile uint32_t *seqp;
char found[256];
const char *bar_path = getenv("GL_FRAMES_BAR");
setvbuf(stdout, NULL, _IONBF, 0);
if (!bar_path)
bar_path = find_bar(found, sizeof(found));
if (!bar_path)
bar_path = BAR_PATH_DEF;
printf("BAR %s\n", bar_path);
fd = open(bar_path, O_RDWR | O_SYNC);
if (fd < 0) {
printf("OPEN_FAIL %s\n", bar_path);
return 1;
}
bar = (unsigned char *)mmap(NULL, BAR_BYTES, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
if (bar == MAP_FAILED) {
printf("MMAP_FAIL\n");
return 1;
}
hdr = (struct frame_hdr *)(bar + FRAME_OFFSET);
seqp = &hdr->seq;
d = XOpenDisplay(NULL);
if (!d) {
printf("NODISPLAY\n");
return 2;
}
scr = DefaultScreen(d);
fb = glXChooseFBConfig(d, scr, attribs, &n);
if (!fb || n < 1) {
printf("NOFBCONFIG\n");
return 3;
}
pb = glXCreatePbuffer(d, fb[0], (int[]){
GLX_PBUFFER_WIDTH, w, GLX_PBUFFER_HEIGHT, h, None });
if (!pb) {
printf("NOPBUFFER\n");
return 4;
}
vi = glXGetVisualFromFBConfig(d, fb[0]);
ctx = glXCreateContext(d, vi, NULL, True);
if (!ctx) {
printf("NOCTX\n");
return 5;
}
if (!glXMakeCurrent(d, pb, ctx)) {
printf("MAKECURRENT_FAIL\n");
return 6;
}
printf("GL %s | %s\n", (const char *)glGetString(GL_VENDOR),
(const char *)glGetString(GL_RENDERER));
px = (unsigned char *)malloc((size_t)w * h * 4);
if (!px) {
printf("HOST_ALLOC_FAIL\n");
return 7;
}
hdr->magic = HDR_MAGIC;
hdr->version = 1;
hdr->width = (uint32_t)w;
hdr->height = (uint32_t)h;
hdr->stride = (uint32_t)w * 4;
hdr->format = 0;
for (i = 0; i < frames; i++) {
uint64_t t0 = now_ns();
uint32_t seq;
draw_frame(i, w, h);
glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, px);
if (glGetError() != GL_NO_ERROR)
printf("GL_ERROR frame=%d\n", i);
memcpy(bar + FRAME_OFFSET + sizeof(struct frame_hdr), px,
(size_t)w * h * 4);
hdr->timestamp_ns = now_ns();
__sync_synchronize();
seq = (uint32_t)(i + 1);
*seqp = seq;
__sync_synchronize();
printf("FRAME seq=%u ms=%.1f px0=%02x%02x%02x%02x\n", seq,
(double)(now_ns() - t0) / 1e6,
px[0], px[1], px[2], px[3]);
if (fps > 0)
usleep((useconds_t)(1000000 / fps));
}
printf("FRAME_DONE frames=%d %dx%d\n", frames, w, h);
glXMakeCurrent(d, None, NULL);
glXDestroyContext(d, ctx);
glXDestroyPbuffer(d, pb);
XCloseDisplay(d);
free(px);
munmap(bar, BAR_BYTES);
close(fd);
return 0;
}
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