internal/driver: Optimization: Replace interface{} with driver.Uniform

Converting a value from/to interface{} can create a value in heap
and this is not efficient.

internal/atlas/image.go

@@ -407,13 +407,13 @@ func (i *Image) processSrc(src *Image) {
 //   5: Color G
 //   6: Color B
 //   7: Color Y
-func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, subimageOffsets [graphics.ShaderImageNum - 1][2]float32, shader *Shader, uniforms []interface{}, evenOdd bool) {
+func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, subimageOffsets [graphics.ShaderImageNum - 1][2]float32, shader *Shader, uniforms []driver.Uniform, evenOdd bool) {
 	backendsM.Lock()
 	defer backendsM.Unlock()
 	i.drawTriangles(srcs, vertices, indices, colorm, mode, filter, address, dstRegion, srcRegion, subimageOffsets, shader, uniforms, evenOdd, false)
 }
 
-func (i *Image) drawTriangles(srcs [graphics.ShaderImageNum]*Image, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, subimageOffsets [graphics.ShaderImageNum - 1][2]float32, shader *Shader, uniforms []interface{}, evenOdd bool, keepOnAtlas bool) {
+func (i *Image) drawTriangles(srcs [graphics.ShaderImageNum]*Image, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, subimageOffsets [graphics.ShaderImageNum - 1][2]float32, shader *Shader, uniforms []driver.Uniform, evenOdd bool, keepOnAtlas bool) {
 	if i.disposed {
 		panic("atlas: the drawing target image must not be disposed (DrawTriangles)")
 	}

internal/buffered/image.go

@@ -202,7 +202,7 @@ func (i *Image) replacePendingPixels(pix []byte, x, y, width, height int) {
 // DrawTriangles draws the src image with the given vertices.
 //
 // Copying vertices and indices is the caller's responsibility.
-func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, subimageOffsets [graphics.ShaderImageNum - 1][2]float32, shader *Shader, uniforms []interface{}, evenOdd bool) {
+func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, subimageOffsets [graphics.ShaderImageNum - 1][2]float32, shader *Shader, uniforms []driver.Uniform, evenOdd bool) {
 	for _, src := range srcs {
 		if i == src {
 			panic("buffered: Image.DrawTriangles: source images must be different from the receiver")

internal/driver/graphics.go

@@ -39,6 +39,11 @@ type ColorM interface {
 	Elements(body *[16]float32, translate *[4]float32)
 }
 
+type Uniform struct {
+	Float32  float32
+	Float32s []float32
+}
+
 type Graphics interface {
 	Begin()
 	End()
@@ -64,7 +69,7 @@ type Graphics interface {
 	//
 	//   * float32
 	//   * []float32
-	DrawTriangles(dst ImageID, srcs [graphics.ShaderImageNum]ImageID, offsets [graphics.ShaderImageNum - 1][2]float32, shader ShaderID, indexLen int, indexOffset int, mode CompositeMode, colorM ColorM, filter Filter, address Address, dstRegion, srcRegion Region, uniforms []interface{}, evenOdd bool) error
+	DrawTriangles(dst ImageID, srcs [graphics.ShaderImageNum]ImageID, offsets [graphics.ShaderImageNum - 1][2]float32, shader ShaderID, indexLen int, indexOffset int, mode CompositeMode, colorM ColorM, filter Filter, address Address, dstRegion, srcRegion Region, uniforms []Uniform, evenOdd bool) error
 }
 
 // GraphicsNotReady represents that the graphics driver is not ready for recovering from the context lost.

internal/graphicscommand/command.go

@@ -145,7 +145,7 @@ func (q *commandQueue) appendIndices(indices []uint16, offset uint16) {
 }
 
 // EnqueueDrawTrianglesCommand enqueues a drawing-image command.
-func (q *commandQueue) EnqueueDrawTrianglesCommand(dst *Image, srcs [graphics.ShaderImageNum]*Image, offsets [graphics.ShaderImageNum - 1][2]float32, vertices []float32, indices []uint16, color affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, shader *Shader, uniforms []interface{}, evenOdd bool) {
+func (q *commandQueue) EnqueueDrawTrianglesCommand(dst *Image, srcs [graphics.ShaderImageNum]*Image, offsets [graphics.ShaderImageNum - 1][2]float32, vertices []float32, indices []uint16, color affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, shader *Shader, uniforms []driver.Uniform, evenOdd bool) {
 	if len(indices) > graphics.IndicesNum {
 		panic(fmt.Sprintf("graphicscommand: len(indices) must be <= graphics.IndicesNum but not at EnqueueDrawTrianglesCommand: len(indices): %d, graphics.IndicesNum: %d", len(indices), graphics.IndicesNum))
 	}
@@ -363,7 +363,7 @@ type drawTrianglesCommand struct {
 	dstRegion driver.Region
 	srcRegion driver.Region
 	shader    *Shader
-	uniforms  []interface{}
+	uniforms  []driver.Uniform
 	evenOdd   bool
 }
 

internal/graphicscommand/image.go

@@ -141,7 +141,7 @@ func (i *Image) InternalSize() (int, int) {
 //
 // If the source image is not specified, i.e., src is nil and there is no image in the uniform variables, the
 // elements for the source image are not used.
-func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, offsets [graphics.ShaderImageNum - 1][2]float32, vertices []float32, indices []uint16, clr affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, shader *Shader, uniforms []interface{}, evenOdd bool) {
+func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, offsets [graphics.ShaderImageNum - 1][2]float32, vertices []float32, indices []uint16, clr affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, shader *Shader, uniforms []driver.Uniform, evenOdd bool) {
 	if shader == nil {
 		// Fast path for rendering without a shader (#1355).
 		img := srcs[0]

internal/graphicsdriver/metal/graphics.go

@@ -775,7 +775,7 @@ func (g *Graphics) flushRenderCommandEncoderIfNeeded() {
 	g.lastDst = nil
 }
 
-func (g *Graphics) draw(rps mtl.RenderPipelineState, dst *Image, dstRegion driver.Region, srcs [graphics.ShaderImageNum]*Image, indexLen int, indexOffset int, uniforms []interface{}, stencilMode stencilMode) error {
+func (g *Graphics) draw(rps mtl.RenderPipelineState, dst *Image, dstRegion driver.Region, srcs [graphics.ShaderImageNum]*Image, indexLen int, indexOffset int, uniforms []driver.Uniform, stencilMode stencilMode) error {
 	// When prepareing a stencil buffer, flush the current render command encoder
 	// to make sure the stencil buffer is cleared when loading.
 	// TODO: What about clearing the stencil buffer by vertices?
@@ -840,15 +840,14 @@ func (g *Graphics) draw(rps mtl.RenderPipelineState, dst *Image, dstRegion drive
 	g.rce.SetVertexBuffer(g.vb, 0, 0)
 
 	for i, u := range uniforms {
-		switch u := u.(type) {
+		if len(u.Float32s) == 0 {
-		case float32:
+			v := u.Float32
-			g.rce.SetVertexBytes(unsafe.Pointer(&u), unsafe.Sizeof(u), i+1)
+			g.rce.SetVertexBytes(unsafe.Pointer(&v), unsafe.Sizeof(v), i+1)
-			g.rce.SetFragmentBytes(unsafe.Pointer(&u), unsafe.Sizeof(u), i+1)
+			g.rce.SetFragmentBytes(unsafe.Pointer(&v), unsafe.Sizeof(v), i+1)
-		case []float32:
+		} else {
-			g.rce.SetVertexBytes(unsafe.Pointer(&u[0]), unsafe.Sizeof(u[0])*uintptr(len(u)), i+1)
+			v := u.Float32s
-			g.rce.SetFragmentBytes(unsafe.Pointer(&u[0]), unsafe.Sizeof(u[0])*uintptr(len(u)), i+1)
+			g.rce.SetVertexBytes(unsafe.Pointer(&v[0]), unsafe.Sizeof(v[0])*uintptr(len(v)), i+1)
-		default:
+			g.rce.SetFragmentBytes(unsafe.Pointer(&v[0]), unsafe.Sizeof(v[0])*uintptr(len(v)), i+1)
-			return fmt.Errorf("metal: unexpected uniform value: %[1]v (type: %[1]T)", u)
 		}
 	}
 
@@ -867,7 +866,7 @@ func (g *Graphics) draw(rps mtl.RenderPipelineState, dst *Image, dstRegion drive
 	return nil
 }
 
-func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderImageNum]driver.ImageID, offsets [graphics.ShaderImageNum - 1][2]float32, shaderID driver.ShaderID, indexLen int, indexOffset int, mode driver.CompositeMode, colorM driver.ColorM, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, uniforms []interface{}, evenOdd bool) error {
+func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderImageNum]driver.ImageID, offsets [graphics.ShaderImageNum - 1][2]float32, shaderID driver.ShaderID, indexLen int, indexOffset int, mode driver.CompositeMode, colorM driver.ColorM, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, uniforms []driver.Uniform, evenOdd bool) error {
 	dst := g.images[dstID]
 
 	if dst.screen {
@@ -880,7 +879,7 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 	}
 
 	rpss := map[stencilMode]mtl.RenderPipelineState{}
-	var uniformVars []interface{}
+	var uniformVars []driver.Uniform
 	if shaderID == driver.InvalidShaderID {
 		if dst.screen && filter == driver.FilterScreen {
 			rpss[noStencil] = g.screenRPS
@@ -915,18 +914,30 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 		if filter == driver.FilterScreen {
 			scale = float32(dst.width) / float32(srcs[0].width)
 		}
-		uniformVars = []interface{}{
+		uniformVars = []driver.Uniform{
-			[]float32{float32(w), float32(h)},
+			{
-			sourceSize,
+				Float32s: []float32{float32(w), float32(h)},
-			esBody[:],
+			},
-			esTranslate[:],
+			{
-			scale,
+				Float32s: sourceSize,
-			[]float32{
+			},
+			{
+				Float32s: esBody[:],
+			},
+			{
+				Float32s: esTranslate[:],
+			},
+			{
+				Float32: scale,
+			},
+			{
+				Float32s: []float32{
 					srcRegion.X,
 					srcRegion.Y,
 					srcRegion.X + srcRegion.Width,
 					srcRegion.Y + srcRegion.Height,
 				},
+			},
 		}
 	} else {
 		for _, stencil := range []stencilMode{
@@ -941,11 +952,13 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 			}
 		}
 
-		uniformVars = make([]interface{}, graphics.PreservedUniformVariablesNum+len(uniforms))
+		uniformVars = make([]driver.Uniform, graphics.PreservedUniformVariablesNum+len(uniforms))
 
 		// Set the destination texture size.
 		dw, dh := dst.internalSize()
-		uniformVars[graphics.DestinationTextureSizeUniformVariableIndex] = []float32{float32(dw), float32(dh)}
+		uniformVars[graphics.DestinationTextureSizeUniformVariableIndex] = driver.Uniform{
+			Float32s: []float32{float32(dw), float32(dh)},
+		}
 
 		// Set the source texture sizes.
 		usizes := make([]float32, 2*len(srcs))
@@ -956,15 +969,21 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 				usizes[2*i+1] = float32(h)
 			}
 		}
-		uniformVars[graphics.TextureSizesUniformVariableIndex] = usizes
+		uniformVars[graphics.TextureSizesUniformVariableIndex] = driver.Uniform{
+			Float32s: usizes,
+		}
 
 		// Set the destination region's origin.
 		udorigin := []float32{float32(dstRegion.X) / float32(dw), float32(dstRegion.Y) / float32(dh)}
-		uniformVars[graphics.TextureDestinationRegionOriginUniformVariableIndex] = udorigin
+		uniformVars[graphics.TextureDestinationRegionOriginUniformVariableIndex] = driver.Uniform{
+			Float32s: udorigin,
+		}
 
 		// Set the destination region's size.
 		udsize := []float32{float32(dstRegion.Width) / float32(dw), float32(dstRegion.Height) / float32(dh)}
-		uniformVars[graphics.TextureDestinationRegionSizeUniformVariableIndex] = udsize
+		uniformVars[graphics.TextureDestinationRegionSizeUniformVariableIndex] = driver.Uniform{
+			Float32s: udsize,
+		}
 
 		// Set the source offsets.
 		uoffsets := make([]float32, 2*len(offsets))
@@ -972,15 +991,21 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 			uoffsets[2*i] = offset[0]
 			uoffsets[2*i+1] = offset[1]
 		}
-		uniformVars[graphics.TextureSourceOffsetsUniformVariableIndex] = uoffsets
+		uniformVars[graphics.TextureSourceOffsetsUniformVariableIndex] = driver.Uniform{
+			Float32s: uoffsets,
+		}
 
 		// Set the source region's origin of texture0.
 		usorigin := []float32{float32(srcRegion.X), float32(srcRegion.Y)}
-		uniformVars[graphics.TextureSourceRegionOriginUniformVariableIndex] = usorigin
+		uniformVars[graphics.TextureSourceRegionOriginUniformVariableIndex] = driver.Uniform{
+			Float32s: usorigin,
+		}
 
 		// Set the source region's size of texture0.
 		ussize := []float32{float32(srcRegion.Width), float32(srcRegion.Height)}
-		uniformVars[graphics.TextureSourceRegionSizeUniformVariableIndex] = ussize
+		uniformVars[graphics.TextureSourceRegionSizeUniformVariableIndex] = driver.Uniform{
+			Float32s: ussize,
+		}
 
 		// Set the additional uniform variables.
 		for i, v := range uniforms {

internal/graphicsdriver/opengl/graphics.go

@@ -170,7 +170,7 @@ func (g *Graphics) uniformVariableName(idx int) string {
 	return name
 }
 
-func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderImageNum]driver.ImageID, offsets [graphics.ShaderImageNum - 1][2]float32, shaderID driver.ShaderID, indexLen int, indexOffset int, mode driver.CompositeMode, colorM driver.ColorM, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, uniforms []interface{}, evenOdd bool) error {
+func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderImageNum]driver.ImageID, offsets [graphics.ShaderImageNum - 1][2]float32, shaderID driver.ShaderID, indexLen int, indexOffset int, mode driver.CompositeMode, colorM driver.ColorM, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, uniforms []driver.Uniform, evenOdd bool) error {
 	destination := g.images[dstID]
 
 	g.drawCalled = true
@@ -197,14 +197,14 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 		dw, dh := destination.framebufferSize()
 		g.uniformVars = append(g.uniformVars, uniformVariable{
 			name: "viewport_size",
-			value: uniformVariableValue{
+			value: driver.Uniform{
-				f32s: []float32{float32(dw), float32(dh)},
+				Float32s: []float32{float32(dw), float32(dh)},
 			},
 			typ: shaderir.Type{Main: shaderir.Vec2},
 		}, uniformVariable{
 			name: "source_region",
-			value: uniformVariableValue{
+			value: driver.Uniform{
-				f32s: []float32{
+				Float32s: []float32{
 					srcRegion.X,
 					srcRegion.Y,
 					srcRegion.X + srcRegion.Width,
@@ -221,14 +221,14 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 			colorM.Elements(&esBody, &esTranslate)
 			g.uniformVars = append(g.uniformVars, uniformVariable{
 				name: "color_matrix_body",
-				value: uniformVariableValue{
+				value: driver.Uniform{
-					f32s: esBody[:],
+					Float32s: esBody[:],
 				},
 				typ: shaderir.Type{Main: shaderir.Mat4},
 			}, uniformVariable{
 				name: "color_matrix_translation",
-				value: uniformVariableValue{
+				value: driver.Uniform{
-					f32s: esTranslate[:],
+					Float32s: esTranslate[:],
 				},
 				typ: shaderir.Type{Main: shaderir.Vec4},
 			})
@@ -238,8 +238,8 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 			sw, sh := g.images[srcIDs[0]].framebufferSize()
 			g.uniformVars = append(g.uniformVars, uniformVariable{
 				name: "source_size",
-				value: uniformVariableValue{
+				value: driver.Uniform{
-					f32s: []float32{float32(sw), float32(sh)},
+					Float32s: []float32{float32(sw), float32(sh)},
 				},
 				typ: shaderir.Type{Main: shaderir.Vec2},
 			})
@@ -249,8 +249,8 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 			scale := float32(destination.width) / float32(g.images[srcIDs[0]].width)
 			g.uniformVars = append(g.uniformVars, uniformVariable{
 				name: "scale",
-				value: uniformVariableValue{
+				value: driver.Uniform{
-					f32: scale,
+					Float32: scale,
 				},
 				typ: shaderir.Type{Main: shaderir.Float},
 			})
@@ -270,7 +270,7 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 			const idx = graphics.DestinationTextureSizeUniformVariableIndex
 			w, h := destination.framebufferSize()
 			g.uniformVars[idx].name = g.uniformVariableName(idx)
-			g.uniformVars[idx].value.f32s = []float32{float32(w), float32(h)}
+			g.uniformVars[idx].value.Float32s = []float32{float32(w), float32(h)}
 			g.uniformVars[idx].typ = shader.ir.Uniforms[idx]
 		}
 		{
@@ -285,7 +285,7 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 			}
 			const idx = graphics.TextureSizesUniformVariableIndex
 			g.uniformVars[idx].name = g.uniformVariableName(idx)
-			g.uniformVars[idx].value.f32s = sizes
+			g.uniformVars[idx].value.Float32s = sizes
 			g.uniformVars[idx].typ = shader.ir.Uniforms[idx]
 		}
 		dw, dh := destination.framebufferSize()
@@ -293,14 +293,14 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 			origin := []float32{float32(dstRegion.X) / float32(dw), float32(dstRegion.Y) / float32(dh)}
 			const idx = graphics.TextureDestinationRegionOriginUniformVariableIndex
 			g.uniformVars[idx].name = g.uniformVariableName(idx)
-			g.uniformVars[idx].value.f32s = origin
+			g.uniformVars[idx].value.Float32s = origin
 			g.uniformVars[idx].typ = shader.ir.Uniforms[idx]
 		}
 		{
 			size := []float32{float32(dstRegion.Width) / float32(dw), float32(dstRegion.Height) / float32(dh)}
 			const idx = graphics.TextureDestinationRegionSizeUniformVariableIndex
 			g.uniformVars[idx].name = g.uniformVariableName(idx)
-			g.uniformVars[idx].value.f32s = size
+			g.uniformVars[idx].value.Float32s = size
 			g.uniformVars[idx].typ = shader.ir.Uniforms[idx]
 		}
 		{
@@ -311,35 +311,28 @@ func (g *Graphics) DrawTriangles(dstID driver.ImageID, srcIDs [graphics.ShaderIm
 			}
 			const idx = graphics.TextureSourceOffsetsUniformVariableIndex
 			g.uniformVars[idx].name = g.uniformVariableName(idx)
-			g.uniformVars[idx].value.f32s = voffsets
+			g.uniformVars[idx].value.Float32s = voffsets
 			g.uniformVars[idx].typ = shader.ir.Uniforms[idx]
 		}
 		{
 			origin := []float32{float32(srcRegion.X), float32(srcRegion.Y)}
 			const idx = graphics.TextureSourceRegionOriginUniformVariableIndex
 			g.uniformVars[idx].name = g.uniformVariableName(idx)
-			g.uniformVars[idx].value.f32s = origin
+			g.uniformVars[idx].value.Float32s = origin
 			g.uniformVars[idx].typ = shader.ir.Uniforms[idx]
 		}
 		{
 			size := []float32{float32(srcRegion.Width), float32(srcRegion.Height)}
 			const idx = graphics.TextureSourceRegionSizeUniformVariableIndex
 			g.uniformVars[idx].name = g.uniformVariableName(idx)
-			g.uniformVars[idx].value.f32s = size
+			g.uniformVars[idx].value.Float32s = size
 			g.uniformVars[idx].typ = shader.ir.Uniforms[idx]
 		}
 
 		for i, v := range uniforms {
 			const offset = graphics.PreservedUniformVariablesNum
 			g.uniformVars[i+offset].name = fmt.Sprintf("U%d", i+offset)
-			switch v := v.(type) {
+			g.uniformVars[i+offset].value = v
-			case float32:
-				g.uniformVars[i+offset].value.f32 = v
-			case []float32:
-				g.uniformVars[i+offset].value.f32s = v
-			default:
-				return fmt.Errorf("opengl: unexpected uniform value: %v (type: %T)", v, v)
-			}
 			g.uniformVars[i+offset].typ = shader.ir.Uniforms[i+offset]
 		}
 	}

internal/graphicsdriver/opengl/program.go

@@ -120,11 +120,6 @@ type programKey struct {
 	address   driver.Address
 }
 
-type uniformVariableValue struct {
-	f32  float32
-	f32s []float32
-}
-
 // openGLState is a state for
 type openGLState struct {
 	// arrayBuffer is OpenGL's array buffer (vertices data).
@@ -137,7 +132,7 @@ type openGLState struct {
 	programs map[programKey]program
 
 	lastProgram       program
-	lastUniforms      map[string]uniformVariableValue
+	lastUniforms      map[string]driver.Uniform
 	lastActiveTexture int
 }
 
@@ -247,7 +242,7 @@ func areSameFloat32Array(a, b []float32) bool {
 
 type uniformVariable struct {
 	name  string
-	value uniformVariableValue
+	value driver.Uniform
 	typ   shaderir.Type
 }
 
@@ -275,7 +270,7 @@ func (g *Graphics) useProgram(program program, uniforms []uniformVariable, textu
 	}
 
 	for _, u := range uniforms {
-		if len(u.value.f32s) == 0 {
+		if len(u.value.Float32s) == 0 {
 			if u.typ.Main != shaderir.Float {
 				expected := &shaderir.Type{Main: shaderir.Float}
 				got := &u.typ
@@ -283,33 +278,29 @@ func (g *Graphics) useProgram(program program, uniforms []uniformVariable, textu
 			}
 
 			cached, ok := g.state.lastUniforms[u.name]
-			if ok && cached.f32 == u.value.f32 {
+			if ok && cached.Float32 == u.value.Float32 {
 				continue
 			}
 			// TODO: Remember whether the location is available or not.
-			g.context.uniformFloat(program, u.name, u.value.f32)
+			g.context.uniformFloat(program, u.name, u.value.Float32)
 			if g.state.lastUniforms == nil {
-				g.state.lastUniforms = map[string]uniformVariableValue{}
+				g.state.lastUniforms = map[string]driver.Uniform{}
-			}
-			g.state.lastUniforms[u.name] = uniformVariableValue{
-				f32: u.value.f32,
 			}
+			g.state.lastUniforms[u.name] = u.value
 		} else {
-			if got, expected := len(u.value.f32s), u.typ.FloatNum(); got != expected {
+			if got, expected := len(u.value.Float32s), u.typ.FloatNum(); got != expected {
 				return fmt.Errorf("opengl: length of a uniform variables %s (%s) doesn't match: expected %d but %d", u.name, u.typ.String(), expected, got)
 			}
 
 			cached, ok := g.state.lastUniforms[u.name]
-			if ok && areSameFloat32Array(cached.f32s, u.value.f32s) {
+			if ok && areSameFloat32Array(cached.Float32s, u.value.Float32s) {
 				continue
 			}
-			g.context.uniformFloats(program, u.name, u.value.f32s, u.typ)
+			g.context.uniformFloats(program, u.name, u.value.Float32s, u.typ)
 			if g.state.lastUniforms == nil {
-				g.state.lastUniforms = map[string]uniformVariableValue{}
+				g.state.lastUniforms = map[string]driver.Uniform{}
-			}
-			g.state.lastUniforms[u.name] = uniformVariableValue{
-				f32s: u.value.f32s,
 			}
+			g.state.lastUniforms[u.name] = u.value
 		}
 	}
 

internal/mipmap/mipmap.go

@@ -83,7 +83,7 @@ func (m *Mipmap) Pixels(x, y, width, height int) ([]byte, error) {
 	return m.orig.Pixels(x, y, width, height)
 }
 
-func (m *Mipmap) DrawTriangles(srcs [graphics.ShaderImageNum]*Mipmap, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, subimageOffsets [graphics.ShaderImageNum - 1][2]float32, shader *Shader, uniforms []interface{}, evenOdd bool, canSkipMipmap bool) {
+func (m *Mipmap) DrawTriangles(srcs [graphics.ShaderImageNum]*Mipmap, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, subimageOffsets [graphics.ShaderImageNum - 1][2]float32, shader *Shader, uniforms []driver.Uniform, evenOdd bool, canSkipMipmap bool) {
 	if len(indices) == 0 {
 		return
 	}

internal/restorable/image.go

@@ -76,7 +76,7 @@ type drawTrianglesHistoryItem struct {
 	dstRegion driver.Region
 	srcRegion driver.Region
 	shader    *Shader
-	uniforms  []interface{}
+	uniforms  []driver.Uniform
 	evenOdd   bool
 }
 
@@ -365,7 +365,7 @@ func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
 //   5: Color G
 //   6: Color B
 //   7: Color Y
-func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, offsets [graphics.ShaderImageNum - 1][2]float32, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, shader *Shader, uniforms []interface{}, evenOdd bool) {
+func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, offsets [graphics.ShaderImageNum - 1][2]float32, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, shader *Shader, uniforms []driver.Uniform, evenOdd bool) {
 	if i.priority {
 		panic("restorable: DrawTriangles cannot be called on a priority image")
 	}
@@ -410,7 +410,7 @@ func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, offsets [gra
 }
 
 // appendDrawTrianglesHistory appends a draw-image history item to the image.
-func (i *Image) appendDrawTrianglesHistory(srcs [graphics.ShaderImageNum]*Image, offsets [graphics.ShaderImageNum - 1][2]float32, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, shader *Shader, uniforms []interface{}, evenOdd bool) {
+func (i *Image) appendDrawTrianglesHistory(srcs [graphics.ShaderImageNum]*Image, offsets [graphics.ShaderImageNum - 1][2]float32, vertices []float32, indices []uint16, colorm affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, shader *Shader, uniforms []driver.Uniform, evenOdd bool) {
 	if i.stale || i.volatile || i.screen {
 		return
 	}

shader.go

@@ -21,6 +21,7 @@ import (
 	"go/token"
 	"strings"
 
+	"github.com/hajimehoshi/ebiten/v2/internal/driver"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphics"
 	"github.com/hajimehoshi/ebiten/v2/internal/mipmap"
 	"github.com/hajimehoshi/ebiten/v2/internal/shader"
@@ -172,7 +173,7 @@ func (s *Shader) Dispose() {
 	s.shader = nil
 }
 
-func (s *Shader) convertUniforms(uniforms map[string]interface{}) []interface{} {
+func (s *Shader) convertUniforms(uniforms map[string]interface{}) []driver.Uniform {
 	type index struct {
 		resultIndex        int
 		shaderUniformIndex int
@@ -191,20 +192,26 @@ func (s *Shader) convertUniforms(uniforms map[string]interface{}) []interface{}
 		idx++
 	}
 
-	us := make([]interface{}, len(names))
+	us := make([]driver.Uniform, len(names))
 	for name, idx := range names {
 		if v, ok := uniforms[name]; ok {
-			// TODO: Check the uniform variable types?
+			switch v := v.(type) {
-			us[idx.resultIndex] = v
+			case float32:
+				us[idx.resultIndex] = driver.Uniform{
+					Float32: v,
+				}
+			case []float32:
+				us[idx.resultIndex] = driver.Uniform{
+					Float32s: v,
+				}
+			default:
+				panic(fmt.Sprintf("ebiten: unexpected uniform value type: %s, %T", name, v))
+			}
 			continue
 		}
 
 		t := s.uniformTypes[idx.shaderUniformIndex]
-		v := zeroUniformValue(t)
+		us[idx.resultIndex] = zeroUniformValue(name, t)
-		if v == nil {
-			panic(fmt.Sprintf("ebiten: unexpected uniform variable type: %s", t.String()))
-		}
-		us[idx.resultIndex] = v
 	}
 
 	// TODO: Panic if uniforms include an invalid name
@@ -212,24 +219,17 @@ func (s *Shader) convertUniforms(uniforms map[string]interface{}) []interface{}
 	return us
 }
 
-func zeroUniformValue(t shaderir.Type) interface{} {
+func zeroUniformValue(name string, t shaderir.Type) driver.Uniform {
 	switch t.Main {
-	case shaderir.Bool:
-		return false
-	case shaderir.Int:
-		return 0
 	case shaderir.Float:
-		return float32(0)
+		return driver.Uniform{
+			Float32: 0,
+		}
 	case shaderir.Array:
-		switch t.Sub[0].Main {
+		return driver.Uniform{
-		case shaderir.Bool:
+			Float32s: make([]float32, t.FloatNum()),
-			return make([]bool, t.Length)
-		case shaderir.Int:
-			return make([]int, t.Length)
-		default:
-			return make([]float32, t.FloatNum())
 		}
 	default:
-		return make([]float32, t.FloatNum())
+		panic(fmt.Sprintf("ebiten: unexpected uniform variable type: %s, %s", name, t.String()))
 	}
 }