From e83f8a5fd9d31f25710f9a82bf490987e77f9e16 Mon Sep 17 00:00:00 2001
From: "kts of kettek (POWERQWACK)" <kts@kettek.net>
Date: Mon, 5 Oct 2020 23:45:32 -0700
Subject: [PATCH 1/3] Implement min/mag texture filtering

These changes allow users to call SetTextureMinFilter and
SetTextureMagFilter on the MasterWindow to change how textures are
filtered for rendering. This allows pixel-perfect rendering via
giu.TextureFilterNearest.
---
 MasterWindow.go            | 20 +++++++++++++
 TextureFilters.go          | 11 ++++++++
 imgui/RendererInterface.go |  4 +++
 imgui/RendererOpenGL3.go   | 58 +++++++++++++++++++++++++++++++++++---
 4 files changed, 89 insertions(+), 4 deletions(-)
 create mode 100644 TextureFilters.go

diff --git a/MasterWindow.go b/MasterWindow.go
index c29c8e3b..37e63417 100644
--- a/MasterWindow.go
+++ b/MasterWindow.go
@@ -210,6 +210,26 @@ func (w *MasterWindow) SetDropCallback(cb func([]string)) {
 	w.platform.SetDropCallback(cb)
 }
 
+// SetTextureMinFilter sets the minifying function for texture rendering.
+func (w *MasterWindow) SetTextureMinFilter(min uint) error {
+	if w.renderer != nil {
+		if err := w.renderer.SetTextureMinFilter(min); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// SetTextureMagFilter sets the magnifying function for texture rendering.
+func (w *MasterWindow) SetTextureMagFilter(mag uint) error {
+	if w.renderer != nil {
+		if err := w.renderer.SetTextureMagFilter(mag); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 // Call the main loop.
 // loopFunc will be used to construct the ui.
 func (w *MasterWindow) Main(loopFunc func()) {
diff --git a/TextureFilters.go b/TextureFilters.go
new file mode 100644
index 00000000..debcfda1
--- /dev/null
+++ b/TextureFilters.go
@@ -0,0 +1,11 @@
+package giu
+
+// Texture filtering types.
+const (
+	TextureFilterNearest = iota
+	TextureFilterLinear
+	TextureFilterNearestMipmapNearest
+	TextureFilterLinearMipmapNearest
+	TextureFilterNearestMipmapLinear
+	TextureFilterLinearMipmapLinear
+)
diff --git a/imgui/RendererInterface.go b/imgui/RendererInterface.go
index 909ee2ac..f44cd075 100644
--- a/imgui/RendererInterface.go
+++ b/imgui/RendererInterface.go
@@ -8,6 +8,10 @@ type Renderer interface {
 	PreRender(clearColor [4]float32)
 	// Render draws the provided imgui draw data.
 	Render(displaySize [2]float32, framebufferSize [2]float32, drawData DrawData)
+	// Sets the texture minifying filter.
+	SetTextureMinFilter(min uint) error
+	// Sets the texture magnifying filter.
+	SetTextureMagFilter(mag uint) error
 	// Load image and return the TextureID
 	LoadImage(image *image.RGBA) (TextureID, error)
 	// Release image
diff --git a/imgui/RendererOpenGL3.go b/imgui/RendererOpenGL3.go
index 6d679ba4..20f82e3b 100644
--- a/imgui/RendererOpenGL3.go
+++ b/imgui/RendererOpenGL3.go
@@ -28,9 +28,21 @@ type OpenGL3 struct {
 	vboHandle               uint32
 	elementsHandle          uint32
 
-	contentScale float32
+	contentScale     float32
+	textureMinFilter int32
+	textureMagFilter int32
 }
 
+// Texture filtering types.
+const (
+	textureFilterNearest = iota
+	textureFilterLinear
+	textureFilterNearestMipmapNearest
+	textureFilterLinearMipmapNearest
+	textureFilterNearestMipmapLinear
+	textureFilterLinearMipmapLinear
+)
+
 // NewOpenGL3 attempts to initialize a renderer.
 // An OpenGL context has to be established before calling this function.
 func NewOpenGL3(io IO, contentScale float32) (*OpenGL3, error) {
@@ -40,9 +52,11 @@ func NewOpenGL3(io IO, contentScale float32) (*OpenGL3, error) {
 	}
 
 	renderer := &OpenGL3{
-		imguiIO:      io,
-		glslVersion:  "#version 150",
-		contentScale: contentScale,
+		imguiIO:          io,
+		glslVersion:      "#version 150",
+		contentScale:     contentScale,
+		textureMinFilter: gl.LINEAR,
+		textureMagFilter: gl.LINEAR,
 	}
 	renderer.createDeviceObjects()
 	return renderer, nil
@@ -176,6 +190,8 @@ func (renderer *OpenGL3) Render(displaySize [2]float32, framebufferSize [2]float
 				gl.Uniform1i(renderer.attribLocationImageType, int32(imageType))
 
 				gl.BindTexture(gl.TEXTURE_2D, uint32(cmd.TextureID()))
+				gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, renderer.textureMinFilter) // minification filter
+				gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, renderer.textureMagFilter) // magnification filter
 				clipRect := cmd.ClipRect()
 				gl.Scissor(int32(clipRect.X), int32(fbHeight)-int32(clipRect.W), int32(clipRect.Z-clipRect.X), int32(clipRect.W-clipRect.Y))
 				gl.DrawElements(gl.TRIANGLES, int32(cmd.ElementCount()), uint32(drawType), unsafe.Pointer(indexBufferOffset))
@@ -384,6 +400,40 @@ func (renderer *OpenGL3) invalidateDeviceObjects() {
 	}
 }
 
+// SetTextureMinFilter sets the minifying function for texture filtering.
+func (renderer *OpenGL3) SetTextureMinFilter(min uint) error {
+	switch min {
+	case textureFilterNearest:
+		renderer.textureMinFilter = gl.NEAREST
+	case textureFilterLinear:
+		renderer.textureMinFilter = gl.LINEAR
+	case textureFilterNearestMipmapNearest:
+		renderer.textureMinFilter = gl.NEAREST_MIPMAP_NEAREST
+	case textureFilterLinearMipmapNearest:
+		renderer.textureMinFilter = gl.LINEAR_MIPMAP_NEAREST
+	case textureFilterNearestMipmapLinear:
+		renderer.textureMinFilter = gl.NEAREST_MIPMAP_LINEAR
+	case textureFilterLinearMipmapLinear:
+		renderer.textureMinFilter = gl.LINEAR_MIPMAP_LINEAR
+	default:
+		return fmt.Errorf("invalid minifying filter")
+	}
+	return nil
+}
+
+// SetTextureMagFilter sets the magnifying function for texture filtering.
+func (renderer *OpenGL3) SetTextureMagFilter(mag uint) error {
+	switch mag {
+	case textureFilterNearest:
+		renderer.textureMagFilter = gl.NEAREST
+	case textureFilterLinear:
+		renderer.textureMagFilter = gl.LINEAR
+	default:
+		return fmt.Errorf("invalid magnifying filter")
+	}
+	return nil
+}
+
 // Load image and return the TextureID
 func (renderer *OpenGL3) LoadImage(image *image.RGBA) (TextureID, error) {
 	texture, err := renderer.createImageTexture(image)

From 06a207d2cb1e1bba077c1ee57253660fa83b4a73 Mon Sep 17 00:00:00 2001
From: "kts of kettek (POWERQWACK)" <kts@kettek.net>
Date: Tue, 6 Oct 2020 02:28:05 -0700
Subject: [PATCH 2/3] Remove min and mag filter setters

---
 MasterWindow.go | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/MasterWindow.go b/MasterWindow.go
index 37e63417..c29c8e3b 100644
--- a/MasterWindow.go
+++ b/MasterWindow.go
@@ -210,26 +210,6 @@ func (w *MasterWindow) SetDropCallback(cb func([]string)) {
 	w.platform.SetDropCallback(cb)
 }
 
-// SetTextureMinFilter sets the minifying function for texture rendering.
-func (w *MasterWindow) SetTextureMinFilter(min uint) error {
-	if w.renderer != nil {
-		if err := w.renderer.SetTextureMinFilter(min); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// SetTextureMagFilter sets the magnifying function for texture rendering.
-func (w *MasterWindow) SetTextureMagFilter(mag uint) error {
-	if w.renderer != nil {
-		if err := w.renderer.SetTextureMagFilter(mag); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
 // Call the main loop.
 // loopFunc will be used to construct the ui.
 func (w *MasterWindow) Main(loopFunc func()) {

From 23b3e247b9c3a76c431f1abe92f0b005a2779432 Mon Sep 17 00:00:00 2001
From: "kts of kettek (POWERQWACK)" <kts@kettek.net>
Date: Tue, 6 Oct 2020 04:53:18 -0700
Subject: [PATCH 3/3] Add min/mag texture filtering example

---
 examples/texturefiltering/gopher-sprite.png   | Bin 0 -> 501 bytes
 examples/texturefiltering/gopher.png          | Bin 0 -> 19040 bytes
 examples/texturefiltering/texturefiltering.go |  93 ++++++++++++++++++
 3 files changed, 93 insertions(+)
 create mode 100644 examples/texturefiltering/gopher-sprite.png
 create mode 100644 examples/texturefiltering/gopher.png
 create mode 100644 examples/texturefiltering/texturefiltering.go

diff --git a/examples/texturefiltering/gopher-sprite.png b/examples/texturefiltering/gopher-sprite.png
new file mode 100644
index 0000000000000000000000000000000000000000..fb24a8ab559ca0d074fb1a8038f0097835b6722f
GIT binary patch
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literal 0
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diff --git a/examples/texturefiltering/gopher.png b/examples/texturefiltering/gopher.png
new file mode 100644
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diff --git a/examples/texturefiltering/texturefiltering.go b/examples/texturefiltering/texturefiltering.go
new file mode 100644
index 00000000..cfd49721
--- /dev/null
+++ b/examples/texturefiltering/texturefiltering.go
@@ -0,0 +1,93 @@
+package main
+
+import (
+	_ "image/jpeg"
+	_ "image/png"
+
+	g "github.com/AllenDang/giu"
+)
+
+var (
+	spriteTexture *g.Texture
+	largeTexture  *g.Texture
+)
+
+func loop() {
+	g.SingleWindow("load image", g.Layout{
+		g.Group(g.Layout{
+			g.Label("15x20 pixel image"),
+			g.Line(
+				g.Group(g.Layout{
+					g.Label("50%"),
+					g.Image(spriteTexture, 8, 10),
+				}),
+				g.Group(g.Layout{
+					g.Label("100%"),
+					g.Image(spriteTexture, 15, 20),
+				}),
+				g.Group(g.Layout{
+					g.Label("800%"),
+					g.Image(spriteTexture, 120, 160),
+				}),
+			),
+		}),
+		g.Group(g.Layout{
+			g.Label("215x140 image"),
+			g.Line(
+				g.Group(g.Layout{
+					g.Label("50%"),
+					g.Image(largeTexture, 215/2, 140/2),
+				}),
+				g.Group(g.Layout{
+					g.Label("100%"),
+					g.Image(largeTexture, 215, 140),
+				}),
+				g.Group(g.Layout{
+					g.Label("200%"),
+					g.Image(largeTexture, 215*2, 140*2),
+				}),
+			),
+		}),
+		g.Line(
+			g.Button("Minify Filter Nearest", func() {
+				g.Context.GetRenderer().SetTextureMinFilter(g.TextureFilterNearest)
+			}),
+			g.Button("Minify Filter Linear", func() {
+				g.Context.GetRenderer().SetTextureMinFilter(g.TextureFilterLinear)
+			}),
+			/*g.Button("Nearest Mipmap Nearest", func() {
+				g.Context.GetRenderer().SetTextureMinFilter(g.TextureFilterNearestMipmapNearest)
+			}),
+			g.Button("Linear Mipmap Nearest", func() {
+				g.Context.GetRenderer().SetTextureMinFilter(g.TextureFilterLinearMipmapNearest)
+			}),
+			g.Button("Nearest Mipmap Linear", func() {
+				g.Context.GetRenderer().SetTextureMinFilter(g.TextureFilterNearestMipmapLinear)
+			}),
+			g.Button("Linear Mipmap Linear", func() {
+				g.Context.GetRenderer().SetTextureMinFilter(g.TextureFilterLinearMipmapLinear)
+			}),*/
+		),
+		g.Line(
+			g.Button("Magnify Filter Nearest", func() {
+				g.Context.GetRenderer().SetTextureMagFilter(g.TextureFilterNearest)
+			}),
+			g.Button("Magnify Filter Linear", func() {
+				g.Context.GetRenderer().SetTextureMagFilter(g.TextureFilterLinear)
+			}),
+		),
+	})
+}
+
+func main() {
+	wnd := g.NewMasterWindow("Texture Filtering", 800, 600, g.MasterWindowFlagsNotResizable, nil)
+
+	spriteImg, _ := g.LoadImage("gopher-sprite.png")
+	largeImg, _ := g.LoadImage("gopher.png")
+	go func() {
+		spriteTexture, _ = g.NewTextureFromRgba(spriteImg)
+		largeTexture, _ = g.NewTextureFromRgba(largeImg)
+	}()
+
+	wnd.Main(loop)
+}