From 7342c28e6be8d3dfaf5b4e0d083c1d796659c953 Mon Sep 17 00:00:00 2001
From: ice_iix <ice_ix@protonmail.ch>
Date: Fri, 25 Dec 2020 10:23:02 -0800
Subject: [PATCH] Revert "Attempt to disable multisampling (glTexImage2D
 instead of glTexImage2DMultisample), but nothing shows up"

This reverts commit 5b972cb3eca0251c2c5e40089a8d425c1838ff62.
---
 src/render/mod.rs                  | 47 +++++++++++++++++++-----------
 src/render/shaders/trans_frag.glsl | 10 +++++--
 2 files changed, 38 insertions(+), 19 deletions(-)

diff --git a/src/render/mod.rs b/src/render/mod.rs
index d9a08b1..163e33e 100644
--- a/src/render/mod.rs
+++ b/src/render/mod.rs
@@ -41,6 +41,9 @@ use std::thread;
 
 const ATLAS_SIZE: usize = 1024;
 
+// TEMP
+const NUM_SAMPLES: i32 = 2;
+
 pub struct Camera {
     pub pos: cgmath::Point3<f64>,
     pub yaw: f64,
@@ -774,6 +777,7 @@ init_shader! {
             required accum => "taccum",
             required revealage => "trevealage",
             required color => "tcolor",
+            required samples => "samples",
         },
     }
 }
@@ -846,30 +850,38 @@ impl TransInfo {
         main.bind();
 
         let fb_color = gl::Texture::new();
-        fb_color.bind(gl::TEXTURE_2D);
-        fb_color.image_2d(
-            gl::TEXTURE_2D,
-            0,
+        fb_color.bind(gl::TEXTURE_2D_MULTISAMPLE);
+        fb_color.image_2d_sample(
+            gl::TEXTURE_2D_MULTISAMPLE,
+            NUM_SAMPLES,
             width,
             height,
-            gl::RGBA,
-            gl::UNSIGNED_BYTE,
-            None,
+            gl::RGBA8,
+            false,
+        );
+        main.texture_2d(
+            gl::COLOR_ATTACHMENT_0,
+            gl::TEXTURE_2D_MULTISAMPLE,
+            &fb_color,
+            0,
         );
-        main.texture_2d(gl::COLOR_ATTACHMENT_0, gl::TEXTURE_2D, &fb_color, 0);
 
         let fb_depth = gl::Texture::new();
-        fb_depth.bind(gl::TEXTURE_2D);
-        fb_depth.image_2d(
-            gl::TEXTURE_2D,
-            0,
+        fb_depth.bind(gl::TEXTURE_2D_MULTISAMPLE);
+        fb_depth.image_2d_sample(
+            gl::TEXTURE_2D_MULTISAMPLE,
+            NUM_SAMPLES,
             width,
             height,
-            gl::DEPTH_COMPONENT,
-            gl::UNSIGNED_BYTE,
-            None,
+            gl::DEPTH_COMPONENT24,
+            false,
+        );
+        main.texture_2d(
+            gl::DEPTH_ATTACHMENT,
+            gl::TEXTURE_2D_MULTISAMPLE,
+            &fb_depth,
+            0,
         );
-        main.texture_2d(gl::DEPTH_ATTACHMENT, gl::TEXTURE_2D, &fb_depth, 0);
         gl::check_framebuffer_status();
 
         gl::unbind_framebuffer();
@@ -913,12 +925,13 @@ impl TransInfo {
         gl::active_texture(1);
         self.revealage.bind(gl::TEXTURE_2D);
         gl::active_texture(2);
-        self.fb_color.bind(gl::TEXTURE_2D);
+        self.fb_color.bind(gl::TEXTURE_2D_MULTISAMPLE);
 
         shader.program.use_program();
         shader.accum.set_int(0);
         shader.revealage.set_int(1);
         shader.color.set_int(2);
+        shader.samples.set_int(NUM_SAMPLES);
         self.array.bind();
         gl::draw_arrays(gl::TRIANGLES, 0, 6);
     }
diff --git a/src/render/shaders/trans_frag.glsl b/src/render/shaders/trans_frag.glsl
index e28048d..123e4c3 100644
--- a/src/render/shaders/trans_frag.glsl
+++ b/src/render/shaders/trans_frag.glsl
@@ -1,6 +1,8 @@
 uniform sampler2D taccum;
 uniform sampler2D trevealage;
-uniform sampler2D tcolor;
+uniform sampler2DMS tcolor;
+
+uniform int samples;
 
 out vec4 fragColor;
 
@@ -10,6 +12,11 @@ void main() {
     float aa = texelFetch(trevealage, C, 0).r;
     vec4 col = texelFetch(tcolor, C, 0);
 
+    for (int i = 1; i < samples; i++) {
+        col += texelFetch(tcolor, C, i);
+    }
+    col /= float(samples);
+
     float r = accum.a;
     accum.a = aa;
     if (r >= 1.0) {
@@ -18,5 +25,4 @@ void main() {
         vec3 alp = clamp(accum.rgb / clamp(accum.a, 1e-4, 5e4), 0.0, 1.0);
         fragColor = vec4(col.rgb * r  + alp * (1.0 - r), 0.0);
     }
-    //fragColor = vec4(0.0, 1.0, 0.0, 0.0); // green test - fragment shader
 }