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Render passes capture the part of the buffer the presenter shows (netplay local viewport)

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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Matthew Stanley
2026-10-02 17:09:10 -07:00
parent 2a46b01374
commit d4b2ec0828
1 changed files with 30 additions and 6 deletions
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runtime/src/gpu_gl_renderer.c
+30 -6
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@@ -5798,7 +5798,8 @@ static void interp_present_source_interval(void) {
typedef struct PassGen {
int valid;
int promoted;
int x, y, w, h; /* guest VRAM rect */
int x, y, w, h; /* captured VRAM rect (what is presented) */
int rx, ry, rw, rh; /* the plugin's pass rect (backed up) */
int tex_w, tex_h; /* slot size (hr pixels; wide band if wide) */
int source_path; /* GL_PRES_VRAM or GL_PRES_WIDE */
uint32_t n; /* images: [0] = the game's own */
@@ -5809,6 +5810,12 @@ typedef struct PassGen {
} PassGen;
static int s_pass_flip_shown = 0;
static PassGen s_pgen[2];
/* The part of the displayed buffer the VRAM present captures, relative to the
* display origin: the whole display, or (netplay local viewport) this peer's
* half. A pass captures the same part of its own buffer, so its images are
* what the presenter would have shown. */
static int s_present_crop_dx = 0, s_present_crop_dy = 0;
static int s_present_crop_w = 0, s_present_crop_h = 0;
/* Slot textures are made as slots fill: [0, s_pgen_alloc_n) exist, all at
* s_pgen_alloc_w x h. A generation never fills past pass_slot_cap, so two
* generations stay inside its budget whatever the internal scale. */
@@ -6223,15 +6230,24 @@ int gl_renderer_pass_begin(int x, int y, int w, int h, int open_gen,
wide = s_interp_source_path == GL_PRES_WIDE && g_wide_w > 0 &&
pass_wide_fbo_for(x) != 0;
tw = (wide ? g_wide_w : w) * S;
th = h * S;
/* Capture what the presenter captures of a displayed buffer: its crop
* (the VRAM path) applied to the pass rect. */
int cx = x, cy = y, cw = w, ch = h;
if (!wide && s_present_crop_w > 0 && s_present_crop_h > 0) {
cx = x + s_present_crop_dx; cy = y + s_present_crop_dy;
cw = s_present_crop_w; ch = s_present_crop_h;
if (cx < x || cy < y || cx + cw > x + w || cy + ch > y + h) return 0;
}
tw = (wide ? g_wide_w : cw) * S;
th = ch * S;
gi = 1 - s_pgen_cur;
g = &s_pgen[gi];
if (open_gen) {
if (tw != s_interp_w || th != s_interp_h) return 0; /* not what is presented */
if (!pass_gen_reserve(gi, 1u, tw, th)) return 0;
memset(g, 0, sizeof *g);
g->x = x; g->y = y; g->w = w; g->h = h;
g->x = cx; g->y = cy; g->w = cw; g->h = ch;
g->rx = x; g->ry = y; g->rw = w; g->rh = h;
g->tex_w = tw; g->tex_h = th;
g->source_path = wide ? GL_PRES_WIDE : GL_PRES_VRAM;
g->period = period_vblanks ? period_vblanks : 1u;
@@ -6240,8 +6256,8 @@ int gl_renderer_pass_begin(int x, int y, int w, int h, int open_gen,
g->phase[0] = 0;
g->n = 1;
g->valid = 1;
} else if (!g->valid || g->promoted || g->x != x || g->y != y ||
g->w != w || g->h != h) {
} else if (!g->valid || g->promoted || g->rx != x || g->ry != y ||
g->rw != w || g->rh != h) {
return 0;
}
@@ -6960,6 +6976,14 @@ int gl_renderer_present_hold_last(void) {
void gl_renderer_present_vram(int disp_x, int disp_y, int w, int h, int linear,
int force_4_3) {
if (!s_ctx || !s_raster_ok) return;
{
GpuDisplayInfo di;
gpu_get_display_info(&di);
s_present_crop_dx = disp_x - (int)di.display_x;
s_present_crop_dy = disp_y - (int)di.display_y;
s_present_crop_w = w;
s_present_crop_h = h;
}
flush_flat_batch();
flush_tex_batch();
flush_cpu_upload();