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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 package org.chromium.chromoting.cardboard; | |
6 | |
7 import static org.chromium.chromoting.cardboard.CardboardUtil.makeFloatBuffer; | |
8 import static org.chromium.chromoting.cardboard.CardboardUtil.makeRectangularTex
tureBuffer; | |
9 | |
10 import android.content.Context; | |
11 import android.graphics.Bitmap; | |
12 import android.graphics.BitmapFactory; | |
13 import android.graphics.PointF; | |
14 import android.graphics.RectF; | |
15 import android.opengl.GLES20; | |
16 | |
17 import org.chromium.chromoting.cardboard.MenuBar.MenuItemType; | |
18 | |
19 import java.nio.FloatBuffer; | |
20 | |
21 /** | |
22 * Cardboard activity menu item representing a corresponding function. | |
23 */ | |
24 public class MenuItem { | |
25 private static final String VERTEX_SHADER = | |
26 "uniform mat4 u_CombinedMatrix;" | |
27 + "attribute vec4 a_Position;" | |
28 + "attribute vec2 a_TexCoordinate;" | |
29 + "varying vec2 v_TexCoordinate;" | |
30 + "attribute float a_selected;" | |
31 + "varying float v_selected;" | |
32 + "void main() {" | |
33 + " v_selected = a_selected;" | |
34 + " v_TexCoordinate = a_TexCoordinate;" | |
35 + " gl_Position = u_CombinedMatrix * a_Position;" | |
36 + "}"; | |
37 | |
38 private static final String FRAGMENT_SHADER = | |
39 "precision mediump float;" | |
40 + "uniform sampler2D u_Texture;" | |
41 + "varying vec2 v_TexCoordinate;" | |
42 + "varying float v_selected;" | |
43 + "void main() {" | |
44 + " vec4 texture = texture2D(u_Texture, v_TexCoordinate);" | |
45 + " if (v_selected > 0.5) {" | |
46 + " gl_FragColor = vec4(texture.r + 0.5, texture.g + 0.5," | |
47 + " texture.b + 0.5, texture.a);" | |
48 + " } else {" | |
49 + " gl_FragColor = texture;" | |
50 + " }" | |
51 + "}"; | |
52 | |
53 private static final FloatBuffer TEXTURE_COORDINATES = makeRectangularTextur
eBuffer( | |
54 0.0f, 1.0f, 0.0f, 1.0f); | |
55 | |
56 private static final int POSITION_COORDINATE_DATA_SIZE = 3; | |
57 private static final int TEXTURE_COORDINATE_DATA_SIZE = 2; | |
58 | |
59 // Number of vertices passed to glDrawArrays(). | |
60 private static final int VERTICES_NUMBER = 6; | |
61 | |
62 private final FloatBuffer mPositionCoordinates; | |
63 | |
64 private int mVertexShaderHandle; | |
65 private int mFragmentShaderHandle; | |
66 private int mProgramHandle; | |
67 private int mCombinedMatrixHandle; | |
68 private int mTextureUniformHandle; | |
69 private int mPositionHandle; | |
70 private int mTextureDataHandle; | |
71 private int mTextureCoordinateHandle; | |
72 private int mItemSelectedHandle; | |
73 | |
74 private MenuItemType mType; | |
75 | |
76 private RectF mRect; | |
77 | |
78 public MenuItem(Context context, MenuItemType type, RectF rect) { | |
79 mType = type; | |
80 mRect = new RectF(rect); | |
81 float halfHeight = mRect.height() / 2; | |
82 float halfWidth = mRect.width() / 2; | |
83 mPositionCoordinates = makeFloatBuffer(new float[] { | |
84 // Desktop model coordinates. | |
85 -halfWidth, halfHeight, 0.0f, | |
86 -halfWidth, -halfHeight, 0.0f, | |
87 halfWidth, halfHeight, 0.0f, | |
88 -halfWidth, -halfHeight, 0.0f, | |
89 halfWidth, -halfHeight, 0.0f, | |
90 halfWidth, halfHeight, 0.0f | |
91 }); | |
92 | |
93 mVertexShaderHandle = | |
94 ShaderHelper.compileShader(GLES20.GL_VERTEX_SHADER, VERTEX_SHADE
R); | |
95 mFragmentShaderHandle = | |
96 ShaderHelper.compileShader(GLES20.GL_FRAGMENT_SHADER, FRAGMENT_S
HADER); | |
97 mProgramHandle = ShaderHelper.createAndLinkProgram(mVertexShaderHandle, | |
98 mFragmentShaderHandle, new String[] {"a_Position", "a_TexCoordin
ate", | |
99 "a_selected", "u_CombinedMatrix", "u_Texture"}); | |
100 | |
101 mCombinedMatrixHandle = | |
102 GLES20.glGetUniformLocation(mProgramHandle, "u_CombinedMatrix"); | |
103 mTextureUniformHandle = GLES20.glGetUniformLocation(mProgramHandle, "u_T
exture"); | |
104 mPositionHandle = GLES20.glGetAttribLocation(mProgramHandle, "a_Position
"); | |
105 mItemSelectedHandle = GLES20.glGetAttribLocation(mProgramHandle, "a_sele
cted"); | |
106 mTextureDataHandle = TextureHelper.createTextureHandle(); | |
107 mTextureCoordinateHandle = GLES20.glGetAttribLocation(mProgramHandle, "a
_TexCoordinate"); | |
108 | |
109 Bitmap texture = BitmapFactory.decodeResource(context.getResources(), | |
110 type.resourceId()); | |
111 TextureHelper.linkTexture(mTextureDataHandle, texture); | |
112 texture.recycle(); | |
113 } | |
114 | |
115 /** | |
116 * Return the type of this menu item. | |
117 */ | |
118 public MenuItemType getType() { | |
119 return mType; | |
120 } | |
121 | |
122 /** | |
123 * Return the position of the center of this menu item. | |
124 */ | |
125 public PointF getPosition() { | |
126 return new PointF(mRect.centerX(), mRect.centerY()); | |
127 } | |
128 | |
129 /** | |
130 * Return true if the point is inside this menu item. | |
131 */ | |
132 public boolean contains(PointF point) { | |
133 return mRect.contains(point.x, point.y); | |
134 } | |
135 | |
136 /** | |
137 * Draw menu item according to the given model view projection matrix. | |
138 */ | |
139 public void draw(float[] combinedMatrix, boolean selected) { | |
140 GLES20.glUseProgram(mProgramHandle); | |
141 | |
142 // Pass in model view project matrix. | |
143 GLES20.glUniformMatrix4fv(mCombinedMatrixHandle, 1, false, combinedMatri
x, 0); | |
144 | |
145 // Pass in whether the item is selected | |
146 GLES20.glVertexAttrib1f(mItemSelectedHandle, selected ? 1.0f : 0.0f); | |
147 | |
148 // Pass in model position. | |
149 GLES20.glVertexAttribPointer(mPositionHandle, POSITION_COORDINATE_DATA_S
IZE, | |
150 GLES20.GL_FLOAT, false, 0, mPositionCoordinates); | |
151 GLES20.glEnableVertexAttribArray(mPositionHandle); | |
152 | |
153 // Pass in texture coordinate. | |
154 GLES20.glVertexAttribPointer(mTextureCoordinateHandle, TEXTURE_COORDINAT
E_DATA_SIZE, | |
155 GLES20.GL_FLOAT, false, 0, TEXTURE_COORDINATES); | |
156 GLES20.glEnableVertexAttribArray(mTextureCoordinateHandle); | |
157 | |
158 // Enable the transparent background. | |
159 GLES20.glEnable(GLES20.GL_BLEND); | |
160 GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA); | |
161 | |
162 GLES20.glActiveTexture(GLES20.GL_TEXTURE0); | |
163 GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureDataHandle); | |
164 GLES20.glUniform1i(mTextureUniformHandle, 0); | |
165 | |
166 GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, VERTICES_NUMBER); | |
167 | |
168 GLES20.glDisable(GLES20.GL_BLEND); | |
169 GLES20.glDisableVertexAttribArray(mPositionHandle); | |
170 GLES20.glDisableVertexAttribArray(mTextureCoordinateHandle); | |
171 } | |
172 | |
173 /* | |
174 * Clean menu item related opengl data. | |
175 */ | |
176 public void clean() { | |
177 GLES20.glDeleteShader(mVertexShaderHandle); | |
178 GLES20.glDeleteShader(mFragmentShaderHandle); | |
179 GLES20.glDeleteTextures(1, new int[]{mTextureDataHandle}, 0); | |
180 } | |
181 } | |
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