Remove redundant texture binds

Cache currently bound and active textures and move texture binds to WebGLState

src/renderers/WebGLRenderer.js

@@ -3351,8 +3351,8 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 		}
 
-		_gl.activeTexture( _gl.TEXTURE0 + slot );
-		_gl.bindTexture( _gl.TEXTURE_2D, texture.__webglTexture );
+		state.activeTexture( _gl.TEXTURE0 + slot );
+		state.bindTexture( _gl.TEXTURE_2D, texture.__webglTexture );
 
 		_gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, texture.flipY );
 		_gl.pixelStorei( _gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, texture.premultiplyAlpha );
@@ -3469,8 +3469,8 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 		}
 
-		_gl.activeTexture( _gl.TEXTURE0 + slot );
-		_gl.bindTexture( _gl.TEXTURE_2D, texture.__webglTexture );
+		state.activeTexture( _gl.TEXTURE0 + slot );
+		state.bindTexture( _gl.TEXTURE_2D, texture.__webglTexture );
 
 	};
 
@@ -3516,8 +3516,8 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 				}
 
-				_gl.activeTexture( _gl.TEXTURE0 + slot );
-				_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, texture.image.__webglTextureCube );
+				state.activeTexture( _gl.TEXTURE0 + slot );
+				state.bindTexture( _gl.TEXTURE_CUBE_MAP, texture.image.__webglTextureCube );
 
 				_gl.pixelStorei( _gl.UNPACK_FLIP_Y_WEBGL, texture.flipY );
 
@@ -3605,8 +3605,8 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 			} else {
 
-				_gl.activeTexture( _gl.TEXTURE0 + slot );
-				_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, texture.image.__webglTextureCube );
+				state.activeTexture( _gl.TEXTURE0 + slot );
+				state.bindTexture( _gl.TEXTURE_CUBE_MAP, texture.image.__webglTextureCube );
 
 			}
 
@@ -3616,8 +3616,8 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 	function setCubeTextureDynamic ( texture, slot ) {
 
-		_gl.activeTexture( _gl.TEXTURE0 + slot );
-		_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, texture.__webglTexture );
+		state.activeTexture( _gl.TEXTURE0 + slot );
+		state.bindTexture( _gl.TEXTURE_CUBE_MAP, texture.__webglTexture );
 
 	}
 
@@ -3684,7 +3684,8 @@ THREE.WebGLRenderer = function ( parameters ) {
 				renderTarget.__webglFramebuffer = [];
 				renderTarget.__webglRenderbuffer = [];
 
-				_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, renderTarget.__webglTexture );
+				state.bindTexture( _gl.TEXTURE_CUBE_MAP, renderTarget.__webglTexture );
+
 				setTextureParameters( _gl.TEXTURE_CUBE_MAP, renderTarget, isTargetPowerOfTwo );
 
 				for ( var i = 0; i < 6; i ++ ) {
@@ -3715,7 +3716,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 				}
 
-				_gl.bindTexture( _gl.TEXTURE_2D, renderTarget.__webglTexture );
+				state.bindTexture( _gl.TEXTURE_2D, renderTarget.__webglTexture );
 				setTextureParameters( _gl.TEXTURE_2D, renderTarget, isTargetPowerOfTwo );
 
 				_gl.texImage2D( _gl.TEXTURE_2D, 0, glFormat, renderTarget.width, renderTarget.height, 0, glFormat, glType, null );
@@ -3748,11 +3749,11 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 			if ( isCube ) {
 
-				_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, null );
+				state.bindTexture( _gl.TEXTURE_CUBE_MAP, null );
 
 			} else {
 
-				_gl.bindTexture( _gl.TEXTURE_2D, null );
+				state.bindTexture( _gl.TEXTURE_2D, null );
 
 			}
 
@@ -3859,15 +3860,15 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 		if ( renderTarget instanceof THREE.WebGLRenderTargetCube ) {
 
-			_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, renderTarget.__webglTexture );
+			state.bindTexture( _gl.TEXTURE_CUBE_MAP, renderTarget.__webglTexture );
 			_gl.generateMipmap( _gl.TEXTURE_CUBE_MAP );
-			_gl.bindTexture( _gl.TEXTURE_CUBE_MAP, null );
+			state.bindTexture( _gl.TEXTURE_CUBE_MAP, null );
 
 		} else {
 
-			_gl.bindTexture( _gl.TEXTURE_2D, renderTarget.__webglTexture );
+			state.bindTexture( _gl.TEXTURE_2D, renderTarget.__webglTexture );
 			_gl.generateMipmap( _gl.TEXTURE_2D );
-			_gl.bindTexture( _gl.TEXTURE_2D, null );
+			state.bindTexture( _gl.TEXTURE_2D, null );
 
 		}
 

src/renderers/webgl/WebGLState.js

@@ -4,6 +4,8 @@
 
 THREE.WebGLState = function ( gl, paramThreeToGL ) {
 
+	var _this = this;
+
 	var newAttributes = new Uint8Array( 16 );
 	var enabledAttributes = new Uint8Array( 16 );
 
@@ -30,6 +32,11 @@ THREE.WebGLState = function ( gl, paramThreeToGL ) {
 	var currentPolygonOffsetFactor = null;
 	var currentPolygonOffsetUnits = null;
 
+	var maxTextures = gl.getParameter( gl.MAX_TEXTURE_IMAGE_UNITS );
+
+	var currentTextureSlot = undefined;
+	var currentBoundTextures = {};
+
 	this.initAttributes = function () {
 
 		for ( var i = 0, l = newAttributes.length; i < l; i ++ ) {
@@ -339,6 +346,47 @@ THREE.WebGLState = function ( gl, paramThreeToGL ) {
 
 	};
 
+	this.activeTexture = function ( webglSlot ) {
+
+		if ( webglSlot === undefined ) webglSlot = gl.TEXTURE0 + maxTextures - 1;
+
+		if ( currentTextureSlot !== webglSlot ) {
+
+			gl.activeTexture( webglSlot );
+			currentTextureSlot = webglSlot;
+
+		}
+
+	}
+
+	this.bindTexture = function ( webglType, webglTexture ) {
+
+		if ( currentTextureSlot === undefined ) {
+
+			_this.activeTexture();
+
+		}
+
+		var boundTexture = currentBoundTextures[currentTextureSlot];
+
+		if ( boundTexture === undefined ) {
+
+			boundTexture = { type: undefined, texture: undefined };
+			currentBoundTextures[currentTextureSlot] = boundTexture;
+
+		}
+
+		if ( boundTexture.type !== webglType || boundTexture.texture !== webglTexture ) {
+
+			gl.bindTexture( webglType, webglTexture );
+
+			boundTexture.type = webglType;
+			boundTexture.texture = webglTexture;
+
+		}
+
+	}
+
 	this.reset = function () {
 
 		for ( var i = 0; i < enabledAttributes.length; i ++ ) {

src/renderers/webgl/plugins/LensFlarePlugin.js

@@ -43,14 +43,14 @@ THREE.LensFlarePlugin = function ( renderer, flares ) {
 		tempTexture      = gl.createTexture();
 		occlusionTexture = gl.createTexture();
 
-		gl.bindTexture( gl.TEXTURE_2D, tempTexture );
+		renderer.state.bindTexture( gl.TEXTURE_2D, tempTexture );
 		gl.texImage2D( gl.TEXTURE_2D, 0, gl.RGB, 16, 16, 0, gl.RGB, gl.UNSIGNED_BYTE, null );
 		gl.texParameteri( gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE );
 		gl.texParameteri( gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE );
 		gl.texParameteri( gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST );
 		gl.texParameteri( gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST );
 
-		gl.bindTexture( gl.TEXTURE_2D, occlusionTexture );
+		renderer.state.bindTexture( gl.TEXTURE_2D, occlusionTexture );
 		gl.texImage2D( gl.TEXTURE_2D, 0, gl.RGBA, 16, 16, 0, gl.RGBA, gl.UNSIGNED_BYTE, null );
 		gl.texParameteri( gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE );
 		gl.texParameteri( gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE );
@@ -346,8 +346,8 @@ THREE.LensFlarePlugin = function ( renderer, flares ) {
 
 				// save current RGB to temp texture
 
-				gl.activeTexture( gl.TEXTURE1 );
-				gl.bindTexture( gl.TEXTURE_2D, tempTexture );
+				renderer.state.activeTexture( gl.TEXTURE1 );
+				renderer.state.bindTexture( gl.TEXTURE_2D, tempTexture );
 				gl.copyTexImage2D( gl.TEXTURE_2D, 0, gl.RGB, screenPositionPixels.x - 8, screenPositionPixels.y - 8, 16, 16, 0 );
 
 
@@ -365,8 +365,8 @@ THREE.LensFlarePlugin = function ( renderer, flares ) {
 
 				// copy result to occlusionMap
 
-				gl.activeTexture( gl.TEXTURE0 );
-				gl.bindTexture( gl.TEXTURE_2D, occlusionTexture );
+				renderer.state.activeTexture( gl.TEXTURE0 );
+				renderer.state.bindTexture( gl.TEXTURE_2D, occlusionTexture );
 				gl.copyTexImage2D( gl.TEXTURE_2D, 0, gl.RGBA, screenPositionPixels.x - 8, screenPositionPixels.y - 8, 16, 16, 0 );
 
 
@@ -375,8 +375,8 @@ THREE.LensFlarePlugin = function ( renderer, flares ) {
 				gl.uniform1i( uniforms.renderType, 1 );
 				gl.disable( gl.DEPTH_TEST );
 
-				gl.activeTexture( gl.TEXTURE1 );
-				gl.bindTexture( gl.TEXTURE_2D, tempTexture );
+				renderer.state.activeTexture( gl.TEXTURE1 );
+				renderer.state.bindTexture( gl.TEXTURE_2D, tempTexture );
 				gl.drawElements( gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0 );
 
 

src/renderers/webgl/plugins/SpritePlugin.js

@@ -114,7 +114,7 @@ THREE.SpritePlugin = function ( renderer, sprites ) {
 
 		gl.uniformMatrix4fv( uniforms.projectionMatrix, false, camera.projectionMatrix.elements );
 
-		gl.activeTexture( gl.TEXTURE0 );
+		renderer.state.activeTexture( gl.TEXTURE0 );
 		gl.uniform1i( uniforms.map, 0 );
 
 		var oldFogType = 0;