place blocks

internal/igwrap/backend/shader.vert

@@ -24,8 +24,5 @@ void main() {
 	fragUV = uv;
 	fragColor = color;
     gl_Position = projection * vec4(pos.xy, 0, 1);
-
-	if ((flags & FLAG_FLIP_Y) != 0)
-		fragUV.y = 1 - fragUV.y;
 }
 

internal/igwrap/imagewrap.go

@@ -13,11 +13,13 @@ import (
 // size is in pixels. texRange is in [0, 1].
 func Image(tex uint32, size itype.Vec2f, texRange itype.Rectf) {
 	min, max := texRange.MinPoint(), texRange.MaxPoint()
+	if GetTextureFlag(tex)&TextureFlag_FlipY == 0 {
+		min[1], max[1] = max[1], min[1] // swap minY/maxY
+	}
 	imgui.ImageV(
 		imgui.TextureID(tex),
 		Vec2(size),
-		imgui.Vec2{X: min[0], Y: max[1]},
-		imgui.Vec2{X: max[0], Y: min[1]},
+		Vec2(min), Vec2(max),
 		Color(255, 255, 255, 255),
 		imgui.Vec4{},
 	)
@@ -28,17 +30,52 @@ func Image(tex uint32, size itype.Vec2f, texRange itype.Rectf) {
 //
 // size is in pixels. texRange is in [0, 1].
 func ImageV(tex uint32, size itype.Vec2f, texRange itype.Rectf, texColor itype.Vec4f, borderColor itype.Vec4f) {
+	min, max := texRange.MinPoint(), texRange.MaxPoint()
+	if GetTextureFlag(tex)&TextureFlag_FlipY == 0 {
+		min[1], max[1] = max[1], min[1] // swap minY/maxY
+	}
 	imgui.ImageV(
 		imgui.TextureID(tex),
 		Vec2(size),
-		Vec2(texRange.MinPoint()),
-		Vec2(texRange.MaxPoint()),
+		Vec2(min), Vec2(max),
 		Vec4(texColor),
 		Vec4(borderColor),
 	)
 }
 
-// Per-texture flags. This is passed to the shader as-is and handled only there.
+func ImageButton(tex uint32, size itype.Vec2f, texRange itype.Rectf) bool {
+	min, max := texRange.MinPoint(), texRange.MaxPoint()
+	if GetTextureFlag(tex)&TextureFlag_FlipY == 0 {
+		min[1], max[1] = max[1], min[1] // swap minY/maxY
+	}
+	return imgui.ImageButtonV(
+		imgui.TextureID(tex),
+		Vec2(size),
+		Vec2(min), Vec2(max),
+		-1,
+		imgui.Vec4{},
+		imgui.Vec4{1, 1, 1, 1},
+	)
+}
+
+func ImageButtonV(tex uint32, size itype.Vec2f, texRange itype.Rectf, padding int, bgCol, tintCol itype.Vec4f) bool {
+	min, max := texRange.MinPoint(), texRange.MaxPoint()
+	if GetTextureFlag(tex)&TextureFlag_FlipY == 0 {
+		min[1], max[1] = max[1], min[1] // swap minY/maxY
+	}
+	return imgui.ImageButtonV(
+		imgui.TextureID(tex),
+		Vec2(size),
+		Vec2(min), Vec2(max),
+		padding,
+		Vec4(bgCol),
+		Vec4(tintCol),
+	)
+}
+
+// Per-texture flags. This is passed to the shader as-is.
+//
+// FilpY is handled by the ImageXXX() call.
 type TextureFlag int
 
 const (