change internal default shader to use -1,-1 texCoords as no texture

graphics.go

@@ -200,7 +200,6 @@ func (s *Sprite) Draw(t ...Transform) {
 		r, g, b, a := colorToRGBA(s.color)
 		ctx.Shader().SetUniformVec4(pixelgl.MaskColor, mgl32.Vec4{r, g, b, a})
 		ctx.Shader().SetUniformMat3(pixelgl.Transform, mat)
-		ctx.Shader().SetUniformInt(pixelgl.IsTexture, 1)
 
 		s.va.Draw()
 	})
@@ -240,10 +239,10 @@ func NewLineColor(parent pixelgl.Doer, c color.Color, a, b Vec, width float64) *
 		}
 	})
 
-	lc.va.SetVertexAttributeVec4(0, pixelgl.Color, mgl32.Vec4{1, 1, 1, 1})
+	for i := 0; i < 4; i++ {
-	lc.va.SetVertexAttributeVec4(1, pixelgl.Color, mgl32.Vec4{1, 1, 1, 1})
+		lc.va.SetVertexAttributeVec4(i, pixelgl.Color, mgl32.Vec4{1, 1, 1, 1})
-	lc.va.SetVertexAttributeVec4(2, pixelgl.Color, mgl32.Vec4{1, 1, 1, 1})
+		lc.va.SetVertexAttributeVec2(i, pixelgl.TexCoord, mgl32.Vec2{-1, -1})
-	lc.va.SetVertexAttributeVec4(3, pixelgl.Color, mgl32.Vec4{1, 1, 1, 1})
+	}
 
 	lc.setPoints()
 
@@ -312,7 +311,6 @@ func (lc *LineColor) Draw(t ...Transform) {
 		r, g, b, a := colorToRGBA(lc.color)
 		ctx.Shader().SetUniformVec4(pixelgl.MaskColor, mgl32.Vec4{r, g, b, a})
 		ctx.Shader().SetUniformMat3(pixelgl.Transform, mat)
-		ctx.Shader().SetUniformInt(pixelgl.IsTexture, 0)
 	})
 
 	lc.va.Draw()
@@ -373,6 +371,11 @@ func NewPolygonColor(parent pixelgl.Doer, c color.Color, points ...Vec) *Polygon
 			pixelgl.Color,
 			mgl32.Vec4{1, 1, 1, 1},
 		)
+		pc.va.SetVertexAttributeVec2(
+			i,
+			pixelgl.TexCoord,
+			mgl32.Vec2{-1, -1},
+		)
 	}
 
 	return pc
@@ -419,7 +422,6 @@ func (pc *PolygonColor) Draw(t ...Transform) {
 		r, g, b, a := colorToRGBA(pc.color)
 		ctx.Shader().SetUniformVec4(pixelgl.MaskColor, mgl32.Vec4{r, g, b, a})
 		ctx.Shader().SetUniformMat3(pixelgl.Transform, mat)
-		ctx.Shader().SetUniformInt(pixelgl.IsTexture, 0)
 	})
 
 	pc.va.Draw()
@@ -488,6 +490,11 @@ func NewEllipseColor(parent pixelgl.Doer, c color.Color, radius Vec, fill float6
 			pixelgl.Color,
 			mgl32.Vec4{1, 1, 1, 1},
 		)
+		ec.va.SetVertexAttributeVec2(
+			i,
+			pixelgl.TexCoord,
+			mgl32.Vec2{-1, -1},
+		)
 		ec.va.SetVertexAttributeVec2(
 			j,
 			pixelgl.Position,
@@ -501,6 +508,11 @@ func NewEllipseColor(parent pixelgl.Doer, c color.Color, radius Vec, fill float6
 			pixelgl.Color,
 			mgl32.Vec4{1, 1, 1, 1},
 		)
+		ec.va.SetVertexAttributeVec2(
+			j,
+			pixelgl.TexCoord,
+			mgl32.Vec2{-1, -1},
+		)
 	}
 
 	return ec
@@ -538,7 +550,6 @@ func (ec *EllipseColor) Draw(t ...Transform) {
 		r, g, b, a := colorToRGBA(ec.color)
 		ctx.Shader().SetUniformVec4(pixelgl.MaskColor, mgl32.Vec4{r, g, b, a})
 		ctx.Shader().SetUniformMat3(pixelgl.Transform, mat)
-		ctx.Shader().SetUniformInt(pixelgl.IsTexture, 0)
 	})
 
 	ec.va.Draw()

pixelgl/attr.go

@@ -20,8 +20,6 @@ const (
 	Transform
 	// MaskColor is a masking color. When drawing, each color gets multiplied by this color.
 	MaskColor
-	// IsTexture signals, whether a texture is present.
-	IsTexture
 	// NumStandardAttrPurposes is the number of standard attribute purposes
 	NumStandardAttrPurposes
 )

window.go

@@ -346,7 +346,6 @@ var defaultVertexFormat = pixelgl.VertexFormat{
 var defaultUniformFormat = pixelgl.UniformFormat{
 	"maskColor": {Purpose: pixelgl.MaskColor, Type: pixelgl.Vec4},
 	"transform": {Purpose: pixelgl.Transform, Type: pixelgl.Mat3},
-	"isTexture": {Purpose: pixelgl.IsTexture, Type: pixelgl.Int},
 }
 
 var defaultVertexShader = `
@@ -377,14 +376,13 @@ in vec2 TexCoord;
 out vec4 color;
 
 uniform vec4 maskColor;
-uniform int isTexture;
 uniform sampler2D tex;
 
 void main() {
-	if (isTexture != 0) {
+	if (TexCoord == vec2(-1, -1)) {
-		color = maskColor * Color * texture(tex, vec2(TexCoord.x, 1 - TexCoord.y));
-	} else {
 		color = maskColor * Color;
+	} else {
+		color = maskColor * Color * texture(tex, vec2(TexCoord.x, 1 - TexCoord.y));
 	}
 }
 `