[client] egl: cleanup texture filtering/post-processing

client/renderers/EGL/framebuffer.c

@@ -0,0 +1,106 @@
+/**
+ * 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 "framebuffer.h"
+#include "texture.h"
+
+#include <stdlib.h>
+
+#include "common/debug.h"
+
+struct EGL_Framebuffer
+{
+  GLuint fbo;
+  EGL_Texture * tex;
+};
+
+bool egl_framebufferInit(EGL_Framebuffer ** fb)
+{
+  EGL_Framebuffer * this = calloc(1, sizeof(*this));
+  if (!this)
+  {
+    DEBUG_ERROR("Failed to allocate ram");
+    return false;
+  }
+
+  if (!egl_textureInit(&this->tex, NULL, EGL_TEXTYPE_BUFFER, false))
+  {
+    DEBUG_ERROR("Failed to initialize the texture");
+    return false;
+  }
+
+  glGenFramebuffers(1, &this->fbo);
+
+  *fb = this;
+  return true;
+}
+
+void egl_framebufferFree(EGL_Framebuffer ** fb)
+{
+  EGL_Framebuffer * this = *fb;
+
+  free(this);
+  *fb = NULL;
+}
+
+bool egl_framebufferSetup(EGL_Framebuffer * this, enum EGL_PixelFormat pixFmt,
+    unsigned int width, unsigned int height)
+{
+  if (!egl_textureSetup(this->tex, pixFmt, width, height, 0))
+  {
+    DEBUG_ERROR("Failed to setup the texture");
+    return false;
+  }
+
+  GLuint tex;
+  egl_textureGet(this->tex, &tex, NULL, NULL);
+
+  glBindTexture(GL_TEXTURE_2D, tex);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+  glBindFramebuffer(GL_FRAMEBUFFER, this->fbo);
+  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+      GL_TEXTURE_2D, tex, 0);
+  glDrawBuffers(1, &(GLenum){GL_COLOR_ATTACHMENT0});
+
+  if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+  {
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    DEBUG_ERROR("Failed to setup the framebuffer");
+    return false;
+  }
+  glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+  return true;
+}
+
+void egl_framebufferBind(EGL_Framebuffer * this)
+{
+  glBindFramebuffer(GL_FRAMEBUFFER, this->fbo);
+  glViewport(0, 0, this->tex->format.width, this->tex->format.height);
+}
+
+GLuint egl_framebufferGetTexture(EGL_Framebuffer * this)
+{
+  GLuint output;
+  egl_textureGet(this->tex, &output, NULL, NULL);
+  return output;
+}