Render to texture: textures made from what a render covers are made again

A render to a texture writes video memory on the console. Here its picture
stays on the graphics card, and video memory gets it later without a write
that faults, so a texture made from that memory - another size, another
format, a part of it - went on showing what was there before: a render made
every frame and drawn as a texture of another shape froze at its first
frame. rtt_watch_add() now has every texture made from what the render
covers made again (VramRendered()), all but the one rendered to, with no
change of page protection; every renderer names that one in its watch.

The DMA test disc renders a picture every frame, red then blue, and draws
it as a texture of another size: tools/vulkan/vk_dma.sh, tools/gl/gl_dma.sh
and tools/rend/d3d_dma.sh have it blue.

core/rend/TexCache.cpp

@@ -347,6 +347,36 @@ void VramLockedWriteRange(u32 offset, u32 size)
 		vram_writes.Mark(page);
 }
 
+/* Render thread, the machine standing still: a render to a texture covers
+ * @size bytes from @offset. On the console it writes them, and a texture
+ * made from them - another size, another format, a part of it - shows what
+ * was there before; here the picture is on the graphics card, and video
+ * memory gets it later (rend/rtt_watch.h) without a write that faults. So
+ * every texture made from them is made again now, but @target, the one
+ * rendered to. No page changes protection: a lock dropped leaves its page
+ * as it is. */
+void VramRendered(u32 offset, u32 size, const BaseTextureCacheData *target)
+{
+	if (size == 0 || offset >= VRAM_SIZE)
+		return;
+	if (size > VRAM_SIZE - offset)
+		size = VRAM_SIZE - offset;
+	vramlock_collect();
+
+	const u32 end = offset + size - 1;
+	for (u32 page = offset / PAGE_SIZE; page <= end / PAGE_SIZE; page++)
+	{
+		const VramLockList& list = VramLocks[page];
+		for (u32 k = 0; k < list.count; k++)
+		{
+			vram_block *lock = list.locks[k];
+			/* (dropping one takes it off every page it is on) */
+			if (lock != nullptr && lock->userdata != target && lock->start <= end && lock->end >= offset)
+				rend_text_invl(lock);
+		}
+	}
+}
+
 /* A block copy (a DMA) is about to write every byte of @size from @offset
  * of video memory, on the thread that runs the machine. What its writes
  * would fault on a page at a time is done once for all of it: a picture

core/rend/TexCache.h

@@ -946,6 +946,7 @@ class BaseTextureCacheData;
 bool VramLockedWriteOffset(size_t offset);
 void VramLockedWriteRange(u32 offset, u32 size);
 void VramBlockWrite(u32 offset, u32 size);
+void VramRendered(u32 offset, u32 size, const BaseTextureCacheData *target);
 void vram_load(const u8 *from);
 void libCore_vramlock_Lock(u32 start_offset, u32 end_offset, BaseTextureCacheData *texture);
 

core/rend/dx11/dx11_texture.cpp

@@ -907,6 +907,7 @@ void dx11_rtt_watch(DX11Texture *texture, u32 addr, u32 x0, u32 y0, u32 width, u
 	watch.alpha_threshold = FB_W_CTRL.fb_alpha_threshold;
 	watch.dither = FB_W_CTRL.fb_dither;
 	watch.tex = (uintptr_t)texture;
+	watch.target = texture;
 	watch.scale = settings.rend.RenderToTextureUpscale > 1 ? settings.rend.RenderToTextureUpscale : 1;
 	if (watch.bytes != 0)
 		rtt_watch_add(&watch, &dx11_rtt_backend);

core/rend/dx12/dx12_texture.cpp

@@ -967,6 +967,7 @@ void dx12_rtt_watch(DX12Texture *texture, u32 addr, u32 x0, u32 y0, u32 width, u
 	watch.alpha_threshold = FB_W_CTRL.fb_alpha_threshold;
 	watch.dither = FB_W_CTRL.fb_dither;
 	watch.tex = (uintptr_t)texture;
+	watch.target = texture;
 	watch.scale = settings.rend.RenderToTextureUpscale > 1 ? settings.rend.RenderToTextureUpscale : 1;
 	if (watch.bytes != 0)
 		rtt_watch_add(&watch, &dx12_rtt_backend);

core/rend/dx9/dx9_texture.cpp

@@ -619,6 +619,7 @@ void dx9_rtt_watch(DX9Texture *texture, u32 addr, u32 x0, u32 y0, u32 width, u32
 	watch.alpha_threshold = FB_W_CTRL.fb_alpha_threshold;
 	watch.dither = FB_W_CTRL.fb_dither;
 	watch.tex = (uintptr_t)texture;
+	watch.target = texture;
 	watch.scale = settings.rend.RenderToTextureUpscale > 1 ? settings.rend.RenderToTextureUpscale : 1;
 	if (watch.bytes != 0)
 		rtt_watch_add(&watch, &dx9_rtt_backend);

core/rend/gles/gltex.cpp

@@ -1225,6 +1225,7 @@ void ReadRTTBuffer() {
 	texture_data->stride_read = 0;	// (rendered, not read)
 	texture_data->made_type = 0;
       libCore_vramlock_Lock(texture_data->sa_tex, texture_data->sa + texture_data->size - 1, texture_data);
+      watch.target = texture_data;
       rtt_watch_add(&watch, &rtt_gl_backend);
     }
     gl.rtt.tex = 0;

core/rend/rtt_watch.cpp

@@ -309,6 +309,8 @@ void rtt_watch_add(const RttWatch *watch, const RttWatchBackend *b)
 #if !defined(TARGET_NO_THREADS)
 	render_thread = sthread_get_current_thread_id();
 #endif
+	if (watch->bytes != 0 && watch->addr + watch->bytes <= VRAM_SIZE)
+		VramRendered(watch->addr, watch->bytes, watch->target);
 	release_garbage();
 	if (need > pixels_size)
 	{

core/rend/rtt_watch.h

@@ -22,6 +22,8 @@
 #include "types.h"
 #include <cstdint>
 
+class BaseTextureCacheData;
+
 struct RttWatch
 {
 	u32 addr;            /* where in video memory, in bytes */
@@ -39,6 +41,10 @@ struct RttWatch
 	u32 age;             /* frames it has waited */
 	u32 serial;          /* this render's, of every render watched: never 0 */
 	bool used;
+	/* The texture cache's texture rendered to, NULL if none. On the console
+	 * a render writes video memory: every other texture made from what it
+	 * covers is made again (VramRendered()). */
+	const BaseTextureCacheData *target;
 };
 
 /* What a renderer hands the picture over to: w by h pixels of R, G, B, A

core/rend/vulkan/rtt_read.cpp

@@ -352,6 +352,7 @@ void vk_rtt_watch(Texture *texture, u32 addr, u32 x0, u32 y0, u32 width, u32 hei
 	watch.alpha_threshold = FB_W_CTRL.fb_alpha_threshold;
 	watch.dither = FB_W_CTRL.fb_dither;
 	watch.tex = (uintptr_t)texture;
+	watch.target = texture;
 	watch.scale = settings.rend.RenderToTextureUpscale > 1 ? settings.rend.RenderToTextureUpscale : 1;
 	if (watch.bytes != 0)
 		rtt_watch_add(&watch, &vk_rtt_backend);

tools/rend/dma_check.py

@@ -2,7 +2,9 @@
 """Check a picture of the test disc built with -DLIVE_DMA (live_prog.c):
 the three textures DMA writes into, where the disc draws them at the top
 right of the screen - cyan over the yellow fetched from a render, cyan, and
-green. The picture is as vk_hdr.c writes one (a 16-byte header: "VKHR", a
+green - and beside the green, a render made every frame drawn as a texture
+of another size: blue, what it is rendered last, not the red of its first
+frames. The picture is as vk_hdr.c writes one (a 16-byte header: "VKHR", a
 format, the width and the height; then 8-bit R, G, B, A rows, top first).
 Used by tools/vulkan/vk_dma.sh, tools/gl/gl_dma.sh and tools/rend/d3d_dma.sh.
 
@@ -25,7 +27,8 @@ def at(x, y):
 want = [((530, 20), (0, 255, 255), "the half: the DMA's cyan"),
         ((530, 60), (255, 255, 0), "the half: the render's yellow, fetched"),
         ((600, 40), (0, 255, 255), "the whole: the DMA's cyan"),
-        ((530, 110), (0, 255, 0), "the texture: the DMA's green")]
+        ((530, 110), (0, 255, 0), "the texture: the DMA's green"),
+        ((600, 110), (0, 0, 255), "a render as another size: the last one's blue")]
 bad = 0
 for (x, y), c, what in want:
     got = at(x, y)

tools/rend/rtt_watch_test.cpp

@@ -46,6 +46,7 @@ void _vmem_open_watched_vram(u32, u32) {}
 bool _vmem_vram_page_watched(u32 page) { return watched[page]; }
 u32 _vmem_get_vram_offset(void *) { return (u32)-1; }
 void VramLockedWriteRange(u32, u32) {}
+void VramRendered(u32, u32, const BaseTextureCacheData *) {}
 
 /* the renderer: every read and every batch of copies begun, in order */
 struct Event { char what; u32 serial; unsigned count; };

tools/threads/live_disc.py

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 """)
 
 

tools/threads/live_prog.c

@@ -473,12 +473,19 @@ static void ta_volume_triangle(u32 x0, u32 y0, u32 x1, u32 y1, u32 x2, u32 y2, u
  * DMA writes cyan over the top half of the first and over all of the
  * second, and a third, at frame 80, green over the 8 by 8 texture at
  * DMA_TEXTURE that was blue and drawn since frame 64. The top right of the
- * screen shows the three: cyan over yellow, cyan, green. */
+ * screen shows the three: cyan over yellow, cyan, green.
+ *
+ * And a fourth, 64 by 64 at DMA_SHAPE, rendered every frame - red for ten
+ * frames, blue after - and drawn as a texture of another size, 32 by 32:
+ * a texture made from the memory a render covers is made again when that
+ * memory is rendered to again, as when it is written. Blue, beside the
+ * green. */
 #define DMA_HALF     (RTT_ADDRESS + 0xE0000)
 #define DMA_WHOLE    (RTT_ADDRESS + 0xE4000)
 #define DMA_TEXTURE  (RTT_ADDRESS + 0xE8000)
+#define DMA_SHAPE    0x600000
 #define DMA_SOURCE   0xAC800000                        /* what the DMAs copy, in main memory */
-static u32 rtt_dma_done;
+static u32 rtt_dma_done, rtt_shape_frames;
 
 /* @len bytes from DMA_SOURCE to video memory at @to, by PVR-DMA */
 static void pvr_dma(u32 to, u32 len)
@@ -819,6 +826,10 @@ static void ta_scene(void)
          F(285.0f), F(5.0f), F(315.0f), F(35.0f));
    ta_quad(TA_TEXTURED, TSP_PLAIN, (1u << 27) | (1u << 26) | (DMA_TEXTURE >> 3), 0xFFFFFFFF, F(0.5f),
          F(250.0f), F(40.0f), F(280.0f), F(70.0f));
+   /* DMA_SHAPE's render, as a 32 by 32 texture */
+   if (rtt_shape_frames != 0)
+      ta_quad(TA_TEXTURED, TSP_PLAIN | (2u << 3) | 2u, (1u << 27) | (1u << 26) | (DMA_SHAPE >> 3), 0xFFFFFFFF, F(0.5f),
+            F(285.0f), F(40.0f), F(315.0f), F(70.0f));
 #endif
 #ifdef LIVE_CULL
    /* With -DLIVE_CULL, on the left: two white polygons that take shadows,
@@ -928,6 +939,12 @@ static void render_to_texture(void)
    else if (rtt_static_age < 120)
       rtt_static_age++;
 #ifdef LIVE_DMA
+   PVR(0x60) = 0x01000000 | DMA_SHAPE;
+   PVR(0x144) = 0x80000000;                            /* TA_LIST_INIT */
+   ta_quad(0, TSP_PLAIN, 0, ++rtt_shape_frames <= 10 ? 0xFFFF0000 : 0xFF0000FF, F(0.5f), F(0.0f), F(0.0f),
+         F(64.0f), F(64.0f));
+   ta_send(0, 0, 0, 0, 0, 0, 0, 0);
+   PVR(0x14) = 0xFFFFFFFF;                             /* STARTRENDER */
    if (!rtt_dma_done)
    {
       rtt_dma_done = 1;