From f7f8060447a2446998d6ee4016973b4fe962246f Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Mon, 9 Aug 2021 17:48:07 +1000
Subject: [PATCH] [client] egl: allow setting an output scale for a
 post-process shader

---
 client/renderers/EGL/texture.c | 16 ++++++++++++----
 client/renderers/EGL/texture.h |  3 ++-
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/client/renderers/EGL/texture.c b/client/renderers/EGL/texture.c
index 7b95574e..22d0995c 100644
--- a/client/renderers/EGL/texture.c
+++ b/client/renderers/EGL/texture.c
@@ -42,6 +42,9 @@ typedef struct RenderStep
   GLuint fb;
   GLuint tex;
   EGL_Shader * shader;
+  float scale;
+
+  unsigned int width, height;
 }
 RenderStep;
 
@@ -117,12 +120,15 @@ void egl_textureFree(EGL_Texture ** tex)
 
 bool setupRenderStep(EGL_Texture * this, RenderStep * step)
 {
+  step->width  = this->format.width  * step->scale;
+  step->height = this->format.height * step->scale;
+
   glBindTexture(GL_TEXTURE_2D, step->tex);
   glTexImage2D(GL_TEXTURE_2D,
       0,
       this->format.intFormat,
-      this->format.width,
-      this->format.height,
+      step->width,
+      step->height,
       0,
       this->format.format,
       this->format.dataType,
@@ -292,7 +298,7 @@ enum EGL_TexStatus egl_textureBind(EGL_Texture * this)
       else
         glBindFramebuffer(GL_FRAMEBUFFER, step->fb);
 
-      glViewport(0, 0, this->format.width, this->format.height);
+      glViewport(0, 0, step->width, step->height);
       egl_shaderUse(step->shader);
       egl_modelRender(this->model);
 
@@ -319,7 +325,8 @@ enum EGL_TexStatus egl_textureBind(EGL_Texture * this)
   return EGL_TEX_STATUS_OK;
 }
 
-enum EGL_TexStatus egl_textureAddShader(EGL_Texture * this, EGL_Shader * shader)
+enum EGL_TexStatus egl_textureAddShader(EGL_Texture * this, EGL_Shader * shader,
+    float outputScale)
 {
   if (!this->render)
   {
@@ -331,6 +338,7 @@ enum EGL_TexStatus egl_textureAddShader(EGL_Texture * this, EGL_Shader * shader)
   RenderStep * step = calloc(1, sizeof(*step));
   glGenTextures(1, &step->tex);
   step->shader = shader;
+  step->scale  = outputScale;
 
   if (this->formatValid)
     if (!setupRenderStep(this, step))
diff --git a/client/renderers/EGL/texture.h b/client/renderers/EGL/texture.h
index cde00f7e..ccd089e8 100644
--- a/client/renderers/EGL/texture.h
+++ b/client/renderers/EGL/texture.h
@@ -166,4 +166,5 @@ enum EGL_TexStatus egl_textureProcess(EGL_Texture * texture);
 
 enum EGL_TexStatus egl_textureBind(EGL_Texture * texture);
 
-enum EGL_TexStatus egl_textureAddShader(EGL_Texture * texture, EGL_Shader * shader);
+enum EGL_TexStatus egl_textureAddShader(EGL_Texture * texture,
+    EGL_Shader * shader, float outputScale);