[client] egl: make filters damage aware

This saves a lot of GPU power for partial updates. Running testufo with
lanczos downscaling and FSR upscaling consumed over 90 W, but with this
commit, consumed only 75 W.

client/renderers/EGL/CMakeLists.txt

@@ -92,6 +92,7 @@ add_library(renderer_EGL STATIC
 	framebuffer.c
 	postprocess.c
 	ffx.c
+	filter.c
 	filter_ffx_cas.c
 	filter_ffx_fsr1.c
 	filter_downscale.c

client/renderers/EGL/desktop.c

@@ -361,9 +361,14 @@ bool egl_desktopRender(EGL_Desktop * desktop, unsigned int outputWidth,
 
   int scaleAlgo = EGL_SCALE_NEAREST;
 
+  egl_desktopRectsMatrix((float *)desktop->matrix->data,
+      desktop->width, desktop->height, x, y, scaleX, scaleY, rotate);
+  egl_desktopRectsUpdate(desktop->mesh, rects, desktop->width, desktop->height);
+
   if (atomic_exchange(&desktop->processFrame, false) ||
       egl_postProcessConfigModified(desktop->pp))
-    egl_postProcessRun(desktop->pp, desktop->texture, outputWidth, outputHeight);
+    egl_postProcessRun(desktop->pp, desktop->texture, desktop->mesh,
+        desktop->width, desktop->height, outputWidth, outputHeight);
 
   unsigned int finalSizeX, finalSizeY;
   GLuint texture = egl_postProcessGetOutput(desktop->pp,
@@ -399,10 +404,6 @@ bool egl_desktopRender(EGL_Desktop * desktop, unsigned int outputWidth,
       scaleAlgo = desktop->scaleAlgo;
   }
 
-  egl_desktopRectsMatrix((float *)desktop->matrix->data,
-      desktop->width, desktop->height, x, y, scaleX, scaleY, rotate);
-  egl_desktopRectsUpdate(desktop->mesh, rects, desktop->width, desktop->height);
-
   const struct DesktopShader * shader = &desktop->shader;
   EGL_Uniform uniforms[] =
   {

client/renderers/EGL/filter.c

@@ -0,0 +1,30 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2021 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program 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 General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "filter.h"
+
+void egl_filterRectsRender(EGL_Shader * shader, EGL_FilterRects * rects)
+{
+  glUniformMatrix3x2fv(egl_shaderGetUniform(shader, "transform"),
+      1, GL_FALSE, rects->matrix);
+  glUniform2f(egl_shaderGetUniform(shader, "desktopSize"),
+      rects->width, rects->height);
+  egl_desktopRectsRender(rects->rects);
+}

client/renderers/EGL/filter.h

@@ -23,10 +23,19 @@
 #include "util.h"
 #include "shader.h"
 #include "egltypes.h"
+#include "desktop_rects.h"
 #include "model.h"
 
 #include <string.h>
 
+typedef struct EGL_FilterRects
+{
+  EGL_DesktopRects * rects;
+  GLfloat * matrix;
+  int width, height;
+}
+EGL_FilterRects;
+
 typedef struct EGL_Filter EGL_Filter;
 
 typedef struct EGL_FilterOps
@@ -78,7 +87,8 @@ typedef struct EGL_FilterOps
 
   /* runs the filter on the provided texture
    * returns the processed texture as the output */
-  GLuint (*run)(EGL_Filter * filter, EGL_Model * model, GLuint texture);
+  GLuint (*run)(EGL_Filter * filter, EGL_FilterRects * rects,
+      GLuint texture);
 
   /* called when the filter output is no loger needed so it can release memory
    * this is optional */
@@ -146,10 +156,10 @@ static inline bool egl_filterPrepare(EGL_Filter * filter)
   return filter->ops.prepare(filter);
 }
 
-static inline GLuint egl_filterRun(EGL_Filter * filter, EGL_Model * model,
-    GLuint texture)
+static inline GLuint egl_filterRun(EGL_Filter * filter,
+    EGL_FilterRects * rects, GLuint texture)
 {
-  return filter->ops.run(filter, model, texture);
+  return filter->ops.run(filter, rects, texture);
 }
 
 static inline void egl_filterRelease(EGL_Filter * filter)
@@ -157,3 +167,5 @@ static inline void egl_filterRelease(EGL_Filter * filter)
   if (filter->ops.release)
     filter->ops.release(filter);
 }
+
+void egl_filterRectsRender(EGL_Shader * shader, EGL_FilterRects * rects);

client/renderers/EGL/filter_downscale.c

@@ -385,8 +385,8 @@ static bool egl_filterDownscalePrepare(EGL_Filter * filter)
   return true;
 }
 
-static GLuint egl_filterDownscaleRun(EGL_Filter * filter, EGL_Model * model,
-    GLuint texture)
+static GLuint egl_filterDownscaleRun(EGL_Filter * filter,
+    EGL_FilterRects * rects, GLuint texture)
 {
   EGL_FilterDownscale * this = UPCAST(EGL_FilterDownscale, filter);
 
@@ -395,25 +395,31 @@ static GLuint egl_filterDownscaleRun(EGL_Filter * filter, EGL_Model * model,
   glActiveTexture(GL_TEXTURE0);
   glBindTexture(GL_TEXTURE_2D, texture);
 
+  EGL_Shader * shader;
+
   switch (this->filter)
   {
     case DOWNSCALE_NEAREST:
       glBindSampler(0, this->sampler[0]);
-      egl_shaderUse(this->nearest);
+      shader = this->nearest;
       break;
 
     case DOWNSCALE_LINEAR:
       glBindSampler(0, this->sampler[1]);
-      egl_shaderUse(this->linear);
+      shader = this->linear;
       break;
 
     case DOWNSCALE_LANCZOS2:
       glBindSampler(0, this->sampler[0]);
-      egl_shaderUse(this->lanczos2);
+      shader = this->lanczos2;
       break;
+
+    default:
+      DEBUG_UNREACHABLE();
   }
 
-  egl_modelRender(model);
+  egl_shaderUse(shader);
+  egl_filterRectsRender(shader, rects);
 
   return egl_framebufferGetTexture(this->fb);
 }

client/renderers/EGL/filter_ffx_cas.c

@@ -262,8 +262,8 @@ static bool egl_filterFFXCASPrepare(EGL_Filter * filter)
   return true;
 }
 
-static GLuint egl_filterFFXCASRun(EGL_Filter * filter, EGL_Model * model,
-    GLuint texture)
+static GLuint egl_filterFFXCASRun(EGL_Filter * filter,
+    EGL_FilterRects * rects, GLuint texture)
 {
   EGL_FilterFFXCAS * this = UPCAST(EGL_FilterFFXCAS, filter);
 
@@ -274,7 +274,7 @@ static GLuint egl_filterFFXCASRun(EGL_Filter * filter, EGL_Model * model,
   glBindSampler(0, this->sampler);
 
   egl_shaderUse(this->shader);
-  egl_modelRender(model);
+  egl_filterRectsRender(this->shader, rects);
 
   return egl_framebufferGetTexture(this->fb);
 }

client/renderers/EGL/filter_ffx_fsr1.c

@@ -388,8 +388,8 @@ static bool egl_filterFFXFSR1Prepare(EGL_Filter * filter)
   return true;
 }
 
-static GLuint egl_filterFFXFSR1Run(EGL_Filter * filter, EGL_Model * model,
-    GLuint texture)
+static GLuint egl_filterFFXFSR1Run(EGL_Filter * filter,
+    EGL_FilterRects * rects, GLuint texture)
 {
   EGL_FilterFFXFSR1 * this = UPCAST(EGL_FilterFFXFSR1, filter);
 
@@ -399,7 +399,7 @@ static GLuint egl_filterFFXFSR1Run(EGL_Filter * filter, EGL_Model * model,
   glBindTexture(GL_TEXTURE_2D, texture);
   glBindSampler(0, this->sampler);
   egl_shaderUse(this->easu);
-  egl_modelRender(model);
+  egl_filterRectsRender(this->easu, rects);
   texture = egl_framebufferGetTexture(this->easuFb);
 
   // pass 2, Rcas
@@ -408,7 +408,7 @@ static GLuint egl_filterFFXFSR1Run(EGL_Filter * filter, EGL_Model * model,
   glBindTexture(GL_TEXTURE_2D, texture);
   glBindSampler(0, this->sampler);
   egl_shaderUse(this->rcas);
-  egl_modelRender(model);
+  egl_filterRectsRender(this->rcas, rects);
   texture = egl_framebufferGetTexture(this->rcasFb);
 
   return texture;

client/renderers/EGL/postprocess.c

@@ -53,7 +53,7 @@ struct EGL_PostProcess
   unsigned int outputX, outputY;
   _Atomic(bool) modified;
 
-  EGL_Model * model;
+  EGL_DesktopRects * rects;
 
   StringList presets;
   char * presetDir;
@@ -523,12 +523,11 @@ bool egl_postProcessInit(EGL_PostProcess ** pp)
     goto error_this;
   }
 
-  if (!egl_modelInit(&this->model))
+  if (!egl_desktopRectsInit(&this->rects, 1))
   {
-    DEBUG_ERROR("Failed to initialize the model");
+    DEBUG_ERROR("Failed to initialize the desktop rects");
     goto error_filters;
   }
-  egl_modelSetDefault(this->model, false);
 
   loadPresetList(this);
   reorderFilters(this);
@@ -561,7 +560,7 @@ void egl_postProcessFree(EGL_PostProcess ** pp)
   if (this->presets)
     stringlist_free(&this->presets);
 
-  egl_modelFree(&this->model);
+  egl_desktopRectsFree(&this->rects);
   free(this->presetError);
   free(this);
   *pp = NULL;
@@ -583,6 +582,7 @@ bool egl_postProcessConfigModified(EGL_PostProcess * this)
 }
 
 bool egl_postProcessRun(EGL_PostProcess * this, EGL_Texture * tex,
+    EGL_DesktopRects * rects, int desktopWidth, int desktopHeight,
     unsigned int targetX, unsigned int targetY)
 {
   EGL_Filter * lastFilter = NULL;
@@ -592,7 +592,22 @@ bool egl_postProcessRun(EGL_PostProcess * this, EGL_Texture * tex,
   if (egl_textureGet(tex, &texture, &sizeX, &sizeY) != EGL_TEX_STATUS_OK)
     return false;
 
-  atomic_store(&this->modified, false);
+  if (atomic_exchange(&this->modified, false))
+  {
+    rects = this->rects;
+    egl_desktopRectsUpdate(rects, NULL, desktopWidth, desktopHeight);
+  }
+
+  GLfloat matrix[6];
+  egl_desktopRectsMatrix(matrix, desktopWidth, desktopHeight, 0.0f, 0.0f,
+      1.0f, 1.0f, LG_ROTATE_0);
+
+  EGL_FilterRects filterRects = {
+    .rects  = rects,
+    .matrix = matrix,
+    .width  = desktopWidth,
+    .height = desktopHeight,
+  };
 
   EGL_Filter * filter;
   vector_forEach(filter, &this->filters)
@@ -603,7 +618,7 @@ bool egl_postProcessRun(EGL_PostProcess * this, EGL_Texture * tex,
     if (!egl_filterPrepare(filter))
       continue;
 
-    texture = egl_filterRun(filter, this->model, texture);
+    texture = egl_filterRun(filter, &filterRects, texture);
     egl_filterGetOutputRes(filter, &sizeX, &sizeY);
 
     if (lastFilter)

client/renderers/EGL/postprocess.h

@@ -20,6 +20,7 @@
 
 #pragma once
 
+#include "desktop_rects.h"
 #include "filter.h"
 #include "texture.h"
 
@@ -39,6 +40,7 @@ bool egl_postProcessConfigModified(EGL_PostProcess * this);
 /* apply the filters to the supplied texture
  * targetX/Y is the final target output dimension hint if scalers are present */
 bool egl_postProcessRun(EGL_PostProcess * this, EGL_Texture * tex,
+    EGL_DesktopRects * rects, int desktopWidth, int desktopHeight,
     unsigned int targetX, unsigned int targetY);
 
 GLuint egl_postProcessGetOutput(EGL_PostProcess * this,

client/renderers/EGL/shader/basic.vert

@@ -1,14 +1,15 @@
 #version 300 es
-
 precision mediump float;
 
-layout(location = 0) in vec2 uVertex;
-layout(location = 1) in vec2 uUV;
-
+layout(location = 0) in vec2 vertex;
 out vec2 fragCoord;
 
+uniform vec2   desktopSize;
+uniform mat3x2 transform;
+
 void main()
 {
-  gl_Position = vec4(uVertex, 0.0, 1.0);
-  fragCoord   = uUV;
+  vec2 pos    = transform * vec3(vertex, 1.0);
+  gl_Position = vec4(pos.x, -pos.y, 0.0, 1.0);
+  fragCoord   = vertex / desktopSize;
 }