Added antialiasing to outer edges

simplified, stupidly fast MSAA for rounded edges

3 files changed, 400 insertions, 52 deletions

diff --git a/src/render/OpenGL.cpp b/src/render/OpenGL.cpp
index 061efc13..1cb5bae9 100644
--- a/src/render/OpenGL.cpp
+++ b/src/render/OpenGL.cpp
@@ -269,6 +269,7 @@ void CHyprOpenGLImpl::renderRect(wlr_box* box, const CColor& col, int round) {
     glUniform2f(glGetUniformLocation(m_shQUAD.program, "bottomRight"), (float)BOTTOMRIGHT.x, (float)BOTTOMRIGHT.y);
     glUniform2f(glGetUniformLocation(m_shQUAD.program, "fullSize"), (float)FULLSIZE.x, (float)FULLSIZE.y);
     glUniform1f(glGetUniformLocation(m_shQUAD.program, "radius"), round);
+    glUniform1i(glGetUniformLocation(m_shQUAD.program, "primitiveMultisample"), (int)(g_pConfigManager->getInt("decoration:multisample_edges") == 1 && round != 0));
 
     glVertexAttribPointer(m_shQUAD.posAttrib, 2, GL_FLOAT, GL_FALSE, 0, fullVerts);
     glVertexAttribPointer(m_shQUAD.texAttrib, 2, GL_FLOAT, GL_FALSE, 0, fullVerts);
@@ -304,7 +305,7 @@ void CHyprOpenGLImpl::renderTexture(const CTexture& tex, wlr_box* pBox, float al
     scissor((wlr_box*)nullptr);
 }
 
-void CHyprOpenGLImpl::renderTextureInternalWithDamage(const CTexture& tex, wlr_box* pBox, float alpha, pixman_region32_t* damage, int round, bool discardOpaque, bool border) {
+void CHyprOpenGLImpl::renderTextureInternalWithDamage(const CTexture& tex, wlr_box* pBox, float alpha, pixman_region32_t* damage, int round, bool discardOpaque, bool border, bool noAA) {
     RASSERT(m_RenderData.pMonitor, "Tried to render texture without begin()!");
     RASSERT((tex.m_iTexID > 0), "Attempted to draw NULL texture!");
 
@@ -362,6 +363,7 @@ void CHyprOpenGLImpl::renderTextureInternalWithDamage(const CTexture& tex, wlr_b
     glUniform2f(glGetUniformLocation(shader->program, "bottomRight"), (float)BOTTOMRIGHT.x, (float)BOTTOMRIGHT.y);
     glUniform2f(glGetUniformLocation(shader->program, "fullSize"), (float)FULLSIZE.x, (float)FULLSIZE.y);
     glUniform1f(glGetUniformLocation(shader->program, "radius"), round);
+    glUniform1i(glGetUniformLocation(shader->program, "primitiveMultisample"), (int)(g_pConfigManager->getInt("decoration:multisample_edges") == 1 && round != 0 && !border && !noAA));
 
     glVertexAttribPointer(shader->posAttrib, 2, GL_FLOAT, GL_FALSE, 0, fullVerts);
     glVertexAttribPointer(shader->texAttrib, 2, GL_FLOAT, GL_FALSE, 0, fullVerts);
@@ -598,7 +600,7 @@ void CHyprOpenGLImpl::renderTextureWithBlur(const CTexture& tex, wlr_box* pBox,
         glStencilFunc(GL_ALWAYS, 1, -1);
         glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
 
-        renderTextureInternalWithDamage(tex, pBox, a, &damage, round);
+        renderTextureInternalWithDamage(tex, pBox, a, &damage, round, false, false, true);
 
         // then stop
         glStencilFunc(GL_EQUAL, 1, -1);
diff --git a/src/render/OpenGL.hpp b/src/render/OpenGL.hpp
index 34eef478..9a8084db 100644
--- a/src/render/OpenGL.hpp
+++ b/src/render/OpenGL.hpp
@@ -110,7 +110,7 @@ private:
     // returns the out FB, can be either Mirror or MirrorSwap
     CFramebuffer*           blurMainFramebufferWithDamage(float a, wlr_box* pBox, pixman_region32_t* damage);
 
-    void                    renderTextureInternalWithDamage(const CTexture&, wlr_box* pBox, float a, pixman_region32_t* damage, int round = 0, bool discardOpaque = false, bool border = false);
+    void                    renderTextureInternalWithDamage(const CTexture&, wlr_box* pBox, float a, pixman_region32_t* damage, int round = 0, bool discardOpaque = false, bool border = false, bool noAA = false);
     void                    renderBorder(wlr_box*, const CColor&, int thick = 1, int round = 0);
 };
 
diff --git a/src/render/Shaders.hpp b/src/render/Shaders.hpp
index 11d40913..2dbbee3f 100644
--- a/src/render/Shaders.hpp
+++ b/src/render/Shaders.hpp
@@ -26,6 +26,8 @@ uniform vec2 bottomRight;
 uniform vec2 fullSize;
 uniform float radius;
 
+uniform int primitiveMultisample;
+
 void main() {
 	if (radius == 0.0) {
 		gl_FragColor = v_color;
@@ -38,15 +40,57 @@ void main() {
 		// we're close left
 		if (pixCoord[1] < topLeft[1]) {
 			// top
-			if (distance(topLeft, pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(topLeft, pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(topLeft, pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = v_color * distances;
+					return;
+				}
 			}
 		} else if (pixCoord[1] > bottomRight[1]) {
 			// bottom
-			if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(vec2(topLeft[0], bottomRight[1]), pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = v_color * distances;
+					return;
+				}
 			}
 		}
 	}
@@ -54,15 +98,57 @@ void main() {
 		// we're close right
 		if (pixCoord[1] < topLeft[1]) {
 			// top
-			if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(vec2(bottomRight[0], topLeft[1]), pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = v_color * distances;
+					return;
+				}
 			}
 		} else if (pixCoord[1] > bottomRight[1]) {
 			// bottom
-			if (distance(bottomRight, pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(bottomRight, pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(bottomRight, pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = v_color * distances;
+					return;
+				}
 			}
 		}
 	}
@@ -94,6 +180,8 @@ uniform float radius;
 
 uniform int discardOpaque;
 
+uniform int primitiveMultisample;
+
 void main() {
 
 	vec4 pixColor = texture2D(tex, v_texcoord);
@@ -109,15 +197,57 @@ void main() {
 		// we're close left
 		if (pixCoord[1] < topLeft[1]) {
 			// top
-			if (distance(topLeft, pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(topLeft, pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(topLeft, pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		} else if (pixCoord[1] > bottomRight[1]) {
 			// bottom
-			if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(vec2(topLeft[0], bottomRight[1]), pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		}
 	}
@@ -125,15 +255,57 @@ void main() {
 		// we're close right
 		if (pixCoord[1] < topLeft[1]) {
 			// top
-			if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(vec2(bottomRight[0], topLeft[1]), pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		} else if (pixCoord[1] > bottomRight[1]) {
 			// bottom
-			if (distance(bottomRight, pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(bottomRight, pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(bottomRight, pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		}
 	}
@@ -154,12 +326,16 @@ uniform float radius;
 
 uniform int discardOpaque;
 
+uniform int primitiveMultisample;
+
 void main() {
 
 	if (discardOpaque == 1 && alpha == 1.0) {
 		discard;
 		return;
 	}
+
+	vec4 pixColor = vec4(texture2D(tex, v_texcoord).rgb, 1.0);
 	
 	vec2 pixCoord = fullSize * v_texcoord;
 
@@ -167,15 +343,57 @@ void main() {
 		// we're close left
 		if (pixCoord[1] < topLeft[1]) {
 			// top
-			if (distance(topLeft, pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(topLeft, pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(topLeft, pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		} else if (pixCoord[1] > bottomRight[1]) {
 			// bottom
-			if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(vec2(topLeft[0], bottomRight[1]), pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		}
 	}
@@ -183,20 +401,62 @@ void main() {
 		// we're close right
 		if (pixCoord[1] < topLeft[1]) {
 			// top
-			if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(vec2(bottomRight[0], topLeft[1]), pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		} else if (pixCoord[1] > bottomRight[1]) {
 			// bottom
-			if (distance(bottomRight, pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(bottomRight, pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(bottomRight, pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		}
 	}
 
-	gl_FragColor = vec4(texture2D(tex, v_texcoord).rgb, 1.0) * alpha;
+	gl_FragColor = pixColor * alpha;
 })#";
 
 inline const std::string FRAGBLUR1 = R"#(
@@ -261,6 +521,8 @@ uniform float radius;
 
 uniform int discardOpaque;
 
+uniform int primitiveMultisample;
+
 void main() {
 
 	vec4 pixColor = texture2D(texture0, v_texcoord);
@@ -276,15 +538,57 @@ void main() {
 		// we're close left
 		if (pixCoord[1] < topLeft[1]) {
 			// top
-			if (distance(topLeft, pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(topLeft, pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(topLeft, pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(topLeft, pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		} else if (pixCoord[1] > bottomRight[1]) {
 			// bottom
-			if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(vec2(topLeft[0], bottomRight[1]), pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(topLeft[0], bottomRight[1]), pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		}
 	}
@@ -292,15 +596,57 @@ void main() {
 		// we're close right
 		if (pixCoord[1] < topLeft[1]) {
 			// top
-			if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(vec2(bottomRight[0], topLeft[1]), pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(vec2(bottomRight[0], topLeft[1]), pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		} else if (pixCoord[1] > bottomRight[1]) {
 			// bottom
-			if (distance(bottomRight, pixCoord) > radius) {
-				discard;
-				return;
+
+			float topLeftDistance = distance(bottomRight, pixCoord);
+
+			if (topLeftDistance > radius - 1.0) {
+				if (primitiveMultisample == 0 && topLeftDistance > radius) {
+					discard;
+					return;
+				} else if (primitiveMultisample == 1) {
+					float distances = 0.0;
+					if (distance(bottomRight, pixCoord + vec2(0.25, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.75, 0.25)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.25, 0.75)) < radius) { distances = distances + 1.0; }
+					if (distance(bottomRight, pixCoord + vec2(0.75, 0.75)) < radius) { distances = distances + 1.0; }
+
+					if (distances == 0.0) {
+						discard;
+						return;
+					}
+
+					distances = distances / 4.0;
+
+					gl_FragColor = pixColor * distances;
+					return;
+				}
 			}
 		}
 	}