From cd7c34cb1616b8496acbf69042f0ab92cfbfca83 Mon Sep 17 00:00:00 2001
From: Brett <brettmaster1@gmail.com>
Date: Tue, 16 Apr 2024 02:28:02 -0400
Subject: [PATCH] multisampling

---
 CMakeLists.txt                                   |  2 +-
 include/blt/gfx/renderer/2d_textured_circle.frag | 11 +++++++++--
 include/blt/gfx/window.h                         |  1 +
 src/blt/gfx/window.cpp                           |  4 ++++
 4 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 72f31bc..8e65d7d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.25)
 
-set(BLT_GRAPHICS_VERSION 0.9.10)
+set(BLT_GRAPHICS_VERSION 0.9.11)
 set(BLT_GRAPHICS_TEST_VERSION 0.0.1)
 
 project(BLT_WITH_GRAPHICS VERSION ${BLT_GRAPHICS_VERSION})
diff --git a/include/blt/gfx/renderer/2d_textured_circle.frag b/include/blt/gfx/renderer/2d_textured_circle.frag
index 14d7031..75a42ef 100644
--- a/include/blt/gfx/renderer/2d_textured_circle.frag
+++ b/include/blt/gfx/renderer/2d_textured_circle.frag
@@ -12,6 +12,8 @@ uniform sampler2D tex;
 uniform vec4 color;
 uniform vec4 use_texture;
 
+const float offset = 1.0 / 32.0;
+
 vec4 linear_iter(vec4 i, vec4 p, float factor){
     return (i + p) * factor;
 }
@@ -19,9 +21,14 @@ vec4 linear_iter(vec4 i, vec4 p, float factor){
 void main() {
     float xs = pos.x * pos.x;
     float ys = pos.y * pos.y;
-    if (xs + ys > 0.5 * 0.5)
+    float ts = xs + ys;
+    const float sq = 0.5 * 0.5;
+    if (ts > sq)
         discard;
-    FragColor = (texture(tex, uv) * use_texture) + color;
+    if (ts + offset > sq)
+        FragColor = vec4(1.0, 1.0, 1.0, 1.0);
+    else
+        FragColor = (texture(tex, uv) * use_texture) + color;
 }
 
 ")";
diff --git a/include/blt/gfx/window.h b/include/blt/gfx/window.h
index e1ac30f..b544c9a 100644
--- a/include/blt/gfx/window.h
+++ b/include/blt/gfx/window.h
@@ -23,6 +23,7 @@ namespace blt::gfx
         std::int32_t GL_MINOR = 6;
         std::int32_t DOUBLE_BUFFER = GLFW_TRUE;
         std::int32_t GL_PROFILE = GLFW_OPENGL_CORE_PROFILE;
+        std::int32_t SAMPLES = 8;
     };
     
     struct window_data
diff --git a/src/blt/gfx/window.cpp b/src/blt/gfx/window.cpp
index 2a4e360..c1f33a7 100644
--- a/src/blt/gfx/window.cpp
+++ b/src/blt/gfx/window.cpp
@@ -186,6 +186,7 @@ namespace blt::gfx
         glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, data.context.GL_MINOR);
         glfwWindowHint(GLFW_DOUBLEBUFFER, data.context.DOUBLE_BUFFER);
         glfwWindowHint(GLFW_OPENGL_PROFILE, data.context.GL_PROFILE);
+        glfwWindowHint(GLFW_SAMPLES, data.context.SAMPLES);
         
         /* -- Create the Window -- */
         window_state.window = glfwCreateWindow(data.width, data.height, data.title.c_str(), nullptr, nullptr);
@@ -204,6 +205,9 @@ namespace blt::gfx
         /* -- Set up ImGUI -- */
         setup_ImGUI();
         
+        if (data.context.SAMPLES > 0)
+            glEnable(GL_MULTISAMPLE);
+        
         /* -- Call User Provided post-window-init function  -- */
         data.init();