[client] egl: implement partial copies for framebuffer textures

This uses the same line sweep algorithm originally created to copy DXGI
textures to IVSHMEM to implement the copy from IVSHMEM to memory-mapped
pixel buffer objects.

client/renderers/EGL/desktop.c

@@ -256,7 +256,8 @@ bool egl_desktop_setup(EGL_Desktop * desktop, const LG_RendererFormat format)
   return true;
 }
 
-bool egl_desktop_update(EGL_Desktop * desktop, const FrameBuffer * frame, int dmaFd)
+bool egl_desktop_update(EGL_Desktop * desktop, const FrameBuffer * frame, int dmaFd,
+    const FrameDamageRect * damageRects, int damageRectsCount)
 {
   if (dmaFd >= 0)
   {
@@ -265,7 +266,7 @@ bool egl_desktop_update(EGL_Desktop * desktop, const FrameBuffer * frame, int dm
   }
   else
   {
-    if (!egl_texture_update_from_frame(desktop->texture, frame))
+    if (!egl_texture_update_from_frame(desktop->texture, frame, damageRects, damageRectsCount))
       return false;
   }
 

client/renderers/EGL/desktop.h

@@ -42,7 +42,8 @@ void egl_desktop_free(EGL_Desktop ** desktop);
 
 void egl_desktop_config_ui(EGL_Desktop * desktop);
 bool egl_desktop_setup (EGL_Desktop * desktop, const LG_RendererFormat format);
-bool egl_desktop_update(EGL_Desktop * desktop, const FrameBuffer * frame, int dmaFd);
+bool egl_desktop_update(EGL_Desktop * desktop, const FrameBuffer * frame, int dmaFd,
+    const FrameDamageRect * damageRects, int damageRectsCount);
 bool egl_desktop_render(EGL_Desktop * desktop, const float x, const float y,
     const float scaleX, const float scaleY, enum EGL_DesktopScaleType scaleType,
     LG_RendererRotate rotate, const struct DamageRects * rects);

client/renderers/EGL/egl.c

@@ -512,7 +512,7 @@ static bool egl_on_frame(void * opaque, const FrameBuffer * frame, int dmaFd,
   struct Inst * this = (struct Inst *)opaque;
 
   uint64_t start = nanotime();
-  if (!egl_desktop_update(this->desktop, frame, dmaFd))
+  if (!egl_desktop_update(this->desktop, frame, dmaFd, damageRects, damageRectsCount))
   {
     DEBUG_INFO("Failed to to update the desktop");
     return false;

client/renderers/EGL/texture.c

@@ -99,12 +99,15 @@ bool egl_texture_update(EGL_Texture * texture, const uint8_t * buffer)
 }
 
 bool egl_texture_update_from_frame(EGL_Texture * texture,
-    const FrameBuffer * frame)
+    const FrameBuffer * frame, const FrameDamageRect * damageRects,
+    int damageRectsCount)
 {
   const struct EGL_TexUpdate update =
   {
     .type      = EGL_TEXTYPE_FRAMEBUFFER,
-    .frame = frame
+    .frame     = frame,
+    .rects     = damageRects,
+    .rectCount = damageRectsCount,
   };
   return texture->ops->update(texture, &update);
 }

client/renderers/EGL/texture.h

@@ -92,7 +92,12 @@ typedef struct EGL_TexUpdate
     const uint8_t * buffer;
 
     /* EGL_TEXTURE_FRAMEBUFFER */
+    struct
+    {
       const FrameBuffer * frame;
+      const FrameDamageRect * rects;
+      int rectCount;
+    };
 
     /* EGL_TEXTURE_DMABUF */
     int dmaFD;
@@ -132,7 +137,8 @@ bool egl_texture_setup(EGL_Texture * texture, enum EGL_PixelFormat pixFmt,
 bool egl_texture_update (EGL_Texture * texture, const uint8_t * buffer);
 
 bool egl_texture_update_from_frame(EGL_Texture * texture,
-    const FrameBuffer * frame);
+    const FrameBuffer * frame, const FrameDamageRect * damageRects,
+    int damageRectsCount);
 
 bool egl_texture_update_from_dma(EGL_Texture * texture,
     const FrameBuffer * frame, const int dmaFd);

client/renderers/EGL/texture_buffer.h

@@ -24,6 +24,8 @@
 #include "texture_util.h"
 #include "common/locking.h"
 
+#define EGL_TEX_BUFFER_MAX 2
+
 typedef struct TextureBuffer
 {
   EGL_Texture base;
@@ -31,9 +33,9 @@ typedef struct TextureBuffer
 
   EGL_TexFormat format;
   int           texCount;
-  GLuint        tex[2];
+  GLuint        tex[EGL_TEX_BUFFER_MAX];
   GLuint        sampler;
-  EGL_TexBuffer buf[2];
+  EGL_TexBuffer buf[EGL_TEX_BUFFER_MAX];
   int           bufFree;
   GLsync        sync;
   LG_Lock       copyLock;

client/renderers/EGL/texture_framebuffer.c

@@ -24,14 +24,54 @@
 
 #include "texture_buffer.h"
 #include "common/debug.h"
+#include "common/KVMFR.h"
+#include "common/rects.h"
+
+struct TexDamage
+{
+  int             count;
+  FrameDamageRect rects[KVMFR_MAX_DAMAGE_RECTS];
+};
+
+typedef struct TexFB
+{
+  TextureBuffer base;
+  struct TexDamage damage[EGL_TEX_BUFFER_MAX];
+}
+TexFB;
+
+static bool eglTexFB_init(EGL_Texture ** texture, EGLDisplay * display)
+{
+  TexFB * this = calloc(sizeof(*this), 1);
+  *texture = &this->base.base;
+
+  EGL_Texture * parent = &this->base.base;
+  if (!eglTexBuffer_init(&parent, display))
+  {
+    free(this);
+    *texture = NULL;
+    return false;
+  }
+
+  for (int i = 0; i < EGL_TEX_BUFFER_MAX; ++i)
+    this->damage[i].count = -1;
+
+  return true;
+}
 
 static bool eglTexFB_update(EGL_Texture * texture, const EGL_TexUpdate * update)
 {
   TextureBuffer * this = UPCAST(TextureBuffer, texture);
+  TexFB * fb = UPCAST(TexFB, this);
   assert(update->type == EGL_TEXTYPE_FRAMEBUFFER);
 
   LG_LOCK(this->copyLock);
 
+  struct TexDamage * damage = fb->damage + this->bufIndex;
+  bool damageAll = !update->rects || update->rectCount == 0 || damage->count < 0 ||
+    damage->count + update->rectCount > KVMFR_MAX_DAMAGE_RECTS;
+
+  if (damageAll)
     framebuffer_read(
       update->frame,
       this->buf[this->bufIndex].map,
@@ -41,8 +81,40 @@ static bool eglTexFB_update(EGL_Texture * texture, const EGL_TexUpdate * update)
       this->format.bpp,
       this->format.stride
     );
+  else
+  {
+    memcpy(damage->rects + damage->count, update->rects,
+      update->rectCount * sizeof(FrameDamageRect));
+    damage->count += update->rectCount;
+    rectsFramebufferToBuffer(
+      damage->rects,
+      damage->count,
+      this->buf[this->bufIndex].map,
+      this->format.stride,
+      this->format.height,
+      update->frame,
+      this->format.stride
+    );
+  }
 
   this->buf[this->bufIndex].updated = true;
+
+  for (int i = 0; i < EGL_TEX_BUFFER_MAX; ++i)
+  {
+    struct TexDamage * damage = fb->damage + i;
+    if (i == this->bufIndex)
+      damage->count = 0;
+    else if (update->rects && update->rectCount > 0 && damage->count >= 0 &&
+             damage->count + update->rectCount <= KVMFR_MAX_DAMAGE_RECTS)
+    {
+      memcpy(damage->rects + damage->count, update->rects,
+        update->rectCount * sizeof(FrameDamageRect));
+      damage->count += update->rectCount;
+    }
+    else
+      damage->count = -1;
+  }
+
   LG_UNLOCK(this->copyLock);
 
   return true;
@@ -50,7 +122,7 @@ static bool eglTexFB_update(EGL_Texture * texture, const EGL_TexUpdate * update)
 
 EGL_TextureOps EGL_TextureFrameBuffer =
 {
-  .init        = eglTexBuffer_stream_init,
+  .init        = eglTexFB_init,
   .free        = eglTexBuffer_free,
   .setup       = eglTexBuffer_stream_setup,
   .update      = eglTexFB_update,