Better handle uniform locations in shaders

src/ol/renderer/webgl-new/PointsLayer.js

@@ -8,46 +8,46 @@ import WebGLContext, {DefaultUniform} from '../../webgl/Context';
 import WebGLVertex from "../../webgl/Vertex";
 import WebGLFragment from "../../webgl/Fragment";
 
-const VERTEX_SHADER =
+const VERTEX_SHADER = `
-  'attribute vec2 a_position;' +
+  attribute vec2 a_position;
-  'attribute vec2 a_texCoord;' +
+  attribute vec2 a_texCoord;
-  'attribute float a_opacity;' +
+  attribute float a_opacity;
-  'attribute float a_rotateWithView;' +
+  attribute float a_rotateWithView;
-  '' +
+  
-  'uniform mat4 u_projectionMatrix;' +
+  uniform mat4 u_projectionMatrix;
-  'uniform mat4 u_offsetScaleMatrix;' +
+  uniform mat4 u_offsetScaleMatrix;
-  'uniform mat4 u_offsetRotateMatrix;' +
+  uniform mat4 u_offsetRotateMatrix;
-  '' +
+  
-  'varying vec2 v_texCoord;' +
+  varying vec2 v_texCoord;
-  'varying float v_opacity;' +
+  varying float v_opacity;
-  '' +
+  
-  'void main(void) {' +
+  void main(void) {
-  '  mat4 offsetMatrix = u_offsetScaleMatrix;' +
+    mat4 offsetMatrix = u_offsetScaleMatrix;
-  '  if (a_rotateWithView == 1.0) {' +
+    if (a_rotateWithView == 1.0) {
-  '    offsetMatrix = u_offsetScaleMatrix * u_offsetRotateMatrix;' +
+      offsetMatrix = u_offsetScaleMatrix * u_offsetRotateMatrix;
-  '  }' +
+    }
-  '  vec4 offsets = offsetMatrix * vec4(a_offsets, 0.0, 0.0);' +
+    vec4 offsets = offsetMatrix * vec4(a_offsets, 0.0, 0.0);
-  '  gl_Position = u_projectionMatrix * vec4(a_position, 0.0, 1.0) + offsets;' +
+    gl_Position = u_projectionMatrix * vec4(a_position, 0.0, 1.0) + offsets;
-  '  v_texCoord = a_texCoord;' +
+    v_texCoord = a_texCoord;
-  '  v_opacity = a_opacity;' +
+    v_opacity = a_opacity;
-  '}';
+  }`;
 
-const FRAGMENT_SHADER =
+const FRAGMENT_SHADER = `
-  'uniform float u_opacity;' +
+  uniform float u_opacity;
-  'uniform sampler2D u_image;' +
+  uniform sampler2D u_image;
-  '' +
+  
-  'varying vec2 v_texCoord;' +
+  varying vec2 v_texCoord;
-  'varying float v_opacity;' +
+  varying float v_opacity;
-  '' +
+  
-  'void main(void) {' +
+  void main(void) {
-  '  vec4 texColor = texture2D(u_image, v_texCoord);' +
+    vec4 texColor = texture2D(u_image, v_texCoord);
-  '  gl_FragColor.rgb = texColor.rgb;' +
+    gl_FragColor.rgb = texColor.rgb;
-  '  float alpha = texColor.a * v_opacity * u_opacity;' +
+    float alpha = texColor.a * v_opacity * u_opacity;
-  '  if (alpha == 0.0) {' +
+    if (alpha == 0.0) {
-  '    discard;' +
+      discard;
-  '  }' +
+    }
-  '  gl_FragColor.a = alpha;' +
+    gl_FragColor.a = alpha;
-  '}';
+  }`;
 
 /**
  * @classdesc
@@ -100,8 +100,8 @@ class WebGLPointsLayerRenderer extends LayerRenderer {
    * @inheritDoc
    */
   prepareFrame(frameState) {
-    const vectorLayer = this.getLayer();
+    const vectorLayer = /** @type {import("../../layer/Vector.js").default} */ (this.getLayer());
-    const vectorSource = vectorLayer.getSource();
+    const vectorSource = /** @type {import("../../source/Vector.js").default} */ (vectorLayer.getSource());
 
     if (this.sourceRevision_ >= vectorSource.getRevision()) {
       return false;

src/ol/webgl/Context.js

@@ -28,7 +28,7 @@ import {create, fromTransform} from "../vec/mat4";
 
 export const DefaultUniform = {
   PROJECTION_MATRIX: 'u_projectionMatrix',
-  SCALE_MATRIX: 'u_offsetScaleMatrix',
+  OFFSET_SCALE_MATRIX: 'u_offsetScaleMatrix',
   OFFSET_ROTATION_MATRIX: 'u_offsetRotateMatrix',
   OPACITY: 'u_opacity'
 };
@@ -115,9 +115,17 @@ class WebGLContext extends Disposable {
      */
     this.offsetScaleMatrix_ = createTransform();
 
+    /**
+     * @private
+     * @type {Array<number>}
+     */
     this.tmpMat4_ = create();
 
-    this.locations_ = {};
+    /**
+     * @private
+     * @type {Object.<string, WebGLUniformLocation>}
+     */
+    this.locations_;
   }
 
   /**
@@ -284,12 +292,21 @@ class WebGLContext extends Disposable {
       rotateTransform(offsetRotateMatrix, -rotation);
     }
 
-    this.getGL().uniformMatrix4fv(locations.u_projectionMatrix, false,
+    this.setUniformMatrixValue(DefaultUniform.PROJECTION_MATRIX, fromTransform(this.tmpMat4_, projectionMatrix));
-      fromTransform(this.tmpMat4_, projectionMatrix));
+    this.setUniformMatrixValue(DefaultUniform.OFFSET_SCALE_MATRIX, fromTransform(this.tmpMat4_, offsetScaleMatrix));
-    this.getGL().uniformMatrix4fv(locations.u_offsetScaleMatrix, false,
+    this.setUniformMatrixValue(DefaultUniform.OFFSET_ROTATION_MATRIX, fromTransform(this.tmpMat4_, offsetRotateMatrix));
-      fromTransform(this.tmpMat4_, offsetScaleMatrix));
+  }
-    this.getGL().uniformMatrix4fv(locations.u_offsetRotateMatrix, false,
+
-      fromTransform(this.tmpMat4_, offsetRotateMatrix));
+  /**
+   * Will get the location from the shader or the cache
+   * @param {string} name Uniform name
+   * @return {WebGLUniformLocation} uniformLocation
+   */
+  getUniformLocation(name) {
+    if (!this.locations_[name]) {
+      this.locations_[name] = this.getGL().getUniformLocation(this.currentProgram_, name);
+    }
+    return this.locations_[name];
   }
 
   /**
@@ -298,7 +315,16 @@ class WebGLContext extends Disposable {
    * @param {number} value Value
    */
   setUniformFloatValue(uniform, value) {
-    this.getGL().uniformMatrix4fv(this.locations_[uniform], false, value);
+    this.getGL().uniform1f(this.getUniformLocation(uniform), value);
+  }
+
+  /**
+   * Give a value for a standard matrix4 uniform
+   * @param {string} uniform Uniform name
+   * @param {Array<number>} value Matrix value
+   */
+  setUniformMatrixValue(uniform, value) {
+    this.getGL().uniformMatrix4fv(this.getUniformLocation(uniform), false, value);
   }
 
   /**
@@ -330,6 +356,7 @@ class WebGLContext extends Disposable {
       const gl = this.getGL();
       gl.useProgram(program);
       this.currentProgram_ = program;
+      this.locations_ = {};
       return true;
     }
   }