[client] egl: implement pixel perfect upscaling

VERSION

@@ -1 +1 @@
-a12-157-g972ff93e6c+1
+a12-158-g6f77ba8aea+1

client/renderers/EGL/desktop.c

@@ -47,6 +47,8 @@ struct EGL_Desktop
 
   // uniforms
   GLint uDesktopPos;
+  GLint uDesktopSize;
+  GLint uNearest;
   GLint uNV, uNVGain;
 
   // internals
@@ -201,6 +203,8 @@ bool egl_desktop_perform_update(EGL_Desktop * desktop, const bool sourceChanged)
     if (desktop->shader)
     {
       desktop->uDesktopPos  = egl_shader_get_uniform_location(desktop->shader, "position");
+      desktop->uDesktopSize = egl_shader_get_uniform_location(desktop->shader, "size"    );
+      desktop->uNearest     = egl_shader_get_uniform_location(desktop->shader, "nearest" );
       desktop->uNV          = egl_shader_get_uniform_location(desktop->shader, "nv"      );
       desktop->uNVGain      = egl_shader_get_uniform_location(desktop->shader, "nvGain"  );
     }
@@ -232,13 +236,16 @@ bool egl_desktop_perform_update(EGL_Desktop * desktop, const bool sourceChanged)
   return true;
 }
 
-void egl_desktop_render(EGL_Desktop * desktop, const float x, const float y, const float scaleX, const float scaleY)
+void egl_desktop_render(EGL_Desktop * desktop, const float x, const float y, const float scaleX, const float scaleY, const bool nearest)
 {
   if (!desktop->shader)
     return;
 
   egl_shader_use(desktop->shader);
   glUniform4f(desktop->uDesktopPos , x, y, scaleX, scaleY);
+  glUniform1i(desktop->uNearest    , nearest ? 1 : 0);
+  glUniform2f(desktop->uDesktopSize, desktop->width, desktop->height);
+
   if (desktop->nvGain)
   {
     glUniform1i(desktop->uNV, 1);

client/renderers/EGL/desktop.h

@@ -30,4 +30,4 @@ void egl_desktop_free(EGL_Desktop ** desktop);
 
 bool egl_desktop_prepare_update(EGL_Desktop * desktop, const bool sourceChanged, const LG_RendererFormat format, const uint8_t * data);
 bool egl_desktop_perform_update(EGL_Desktop * desktop, const bool sourceChanged);
-void egl_desktop_render(EGL_Desktop * desktop, const float x, const float y, const float scaleX, const float scaleY);
+void egl_desktop_render(EGL_Desktop * desktop, const float x, const float y, const float scaleX, const float scaleY, const bool nearest);

client/renderers/EGL/egl.c

@@ -86,6 +86,7 @@ struct Inst
   float scaleX      , scaleY;
   float splashRatio;
   float screenScaleX, screenScaleY;
+  bool  useNearest;
 
   float        mouseWidth , mouseHeight;
   float        mouseScaleX, mouseScaleY;
@@ -239,6 +240,8 @@ bool egl_on_frame_event(void * opaque, const LG_RendererFormat format, const uin
   if (this->sourceChanged)
     memcpy(&this->format, &format, sizeof(LG_RendererFormat));
 
+  this->useNearest = this->width < format.width || this->height < format.height;
+
   if (!egl_desktop_prepare_update(this->desktop, this->sourceChanged, format, data))
   {
     DEBUG_INFO("Failed to prepare to update the desktop");
@@ -420,7 +423,7 @@ bool egl_render(void * opaque, SDL_Window * window)
   glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
   glClear(GL_COLOR_BUFFER_BIT);
 
-  egl_desktop_render(this->desktop, this->translateX, this->translateY, this->scaleX, this->scaleY);
+  egl_desktop_render(this->desktop, this->translateX, this->translateY, this->scaleX, this->scaleY, this->useNearest);
   egl_cursor_render(this->cursor);
 
   if (!this->waitDone)

client/renderers/EGL/shader/desktop_rgb.frag

@@ -4,12 +4,19 @@ in  highp vec2 uv;
 out highp vec4 color;
 
 uniform sampler2D sampler1;
+
+uniform       int   nearest;
+uniform highp vec2  size;
+
 uniform       int   nv;
 uniform highp float nvGain;
 
 void main()
 {
+  if(nearest == 1)
     color = texture(sampler1, uv);
+  else
+    color = texelFetch(sampler1, ivec2(uv * size), 0);
 
   if (nv == 1)
   {

client/renderers/EGL/shader/desktop_yuv.frag

@@ -3,6 +3,9 @@
 in  highp vec2 uv;
 out highp vec4 color;
 
+uniform       int   nearest;
+uniform highp vec2  size;
+
 uniform       int   nv;
 uniform highp float nvGain;
 
@@ -12,12 +15,26 @@ uniform sampler2D sampler3;
 
 void main()
 {
-  highp vec4 yuv = vec4(
+  highp vec4 yuv;
+  if(nearest == 1)
+  {
+    yuv = vec4(
       texture(sampler1, uv).r,
       texture(sampler2, uv).r,
       texture(sampler3, uv).r,
       1.0
     );
+  }
+  else
+  {
+    highp ivec2 px = ivec2(uv * size);
+    yuv = vec4(
+      texelFetch(sampler1, px, 0).r,
+      texelFetch(sampler2, px, 0).r,
+      texelFetch(sampler3, px, 0).r,
+      1.0
+    );
+  }
   
   highp mat4 yuv_to_rgb = mat4(
     1.0,  0.0  ,  1.402, -0.701,