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Vishnu Nair16efdbf2019-12-10 11:55:42 -08001/*
2 * Copyright 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#pragma once
18
19#include <math/vec4.h>
20#include <ui/Rect.h>
21
22#include "GLSkiaShadowPort.h"
23
24namespace android {
25namespace renderengine {
26
27class Mesh;
28
29namespace gl {
30
31/**
32 * Generates gl attributes required to draw shadow spot and/or ambient shadows.
33 *
34 * Each shadow can support different colors. This class generates three vertex attributes for
35 * each shadow, its position, color and shadow params(offset and distance). These can be sent
36 * using a single glDrawElements call.
37 */
38class GLShadowVertexGenerator {
39public:
40 GLShadowVertexGenerator(const FloatRect& casterRect, float casterCornerRadius, float casterZ,
41 bool casterIsTranslucent, const vec4& ambientColor,
42 const vec4& spotColor, const vec3& lightPosition, float lightRadius);
43 ~GLShadowVertexGenerator() = default;
44
45 size_t getVertexCount() const;
46 size_t getIndexCount() const;
47 void fillVertices(Mesh::VertexArray<vec2>& position, Mesh::VertexArray<vec4>& color,
48 Mesh::VertexArray<vec3>& params) const;
49 void fillIndices(uint16_t* indices) const;
50
51private:
52 bool mDrawAmbientShadow;
53 std::unique_ptr<Geometry> mAmbientShadowGeometry;
54 int mAmbientShadowVertexCount = 0;
55 int mAmbientShadowIndexCount = 0;
56
57 bool mDrawSpotShadow;
58 std::unique_ptr<Geometry> mSpotShadowGeometry;
59 int mSpotShadowVertexCount = 0;
60 int mSpotShadowIndexCount = 0;
61};
62
63} // namespace gl
64} // namespace renderengine
65} // namespace android