2 * Copyright 2013 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #include <GLES2/gl2.h>
18 #include <GLES2/gl2ext.h>
20 #include <utils/String8.h>
22 #include "ProgramCache.h"
24 #include "Description.h"
27 // -----------------------------------------------------------------------------------------------
31 * A simple formatter class to automatically add the endl and
32 * manage the indentation.
36 static Formatter& indent(Formatter& f);
37 static Formatter& dedent(Formatter& f);
42 typedef Formatter& (*FormaterManipFunc)(Formatter&);
43 friend Formatter& indent(Formatter& f);
44 friend Formatter& dedent(Formatter& f);
46 Formatter() : mIndent(0) {}
48 String8 getString() const {
52 friend Formatter& operator << (Formatter& out, const char* in) {
53 for (int i=0 ; i<out.mIndent ; i++) {
54 out.mString.append(" ");
56 out.mString.append(in);
57 out.mString.append("\n");
60 friend inline Formatter& operator << (Formatter& out, const String8& in) {
61 return operator << (out, in.string());
63 friend inline Formatter& operator<<(Formatter& to, FormaterManipFunc func) {
67 Formatter& indent(Formatter& f) {
71 Formatter& dedent(Formatter& f) {
76 // -----------------------------------------------------------------------------------------------
78 ANDROID_SINGLETON_STATIC_INSTANCE(ProgramCache)
81 ProgramCache::ProgramCache() {
84 ProgramCache::~ProgramCache() {
87 ProgramCache::Key ProgramCache::computeKey(const Description& description) {
89 needs.set(Key::TEXTURE_MASK,
90 !description.mTextureEnabled ? Key::TEXTURE_OFF :
91 description.mTexture.getTextureTarget() == GL_TEXTURE_EXTERNAL_OES ? Key::TEXTURE_EXT :
92 description.mTexture.getTextureTarget() == GL_TEXTURE_2D ? Key::TEXTURE_2D :
94 .set(Key::PLANE_ALPHA_MASK,
95 (description.mPlaneAlpha < 1) ? Key::PLANE_ALPHA_LT_ONE : Key::PLANE_ALPHA_EQ_ONE)
97 description.mPremultipliedAlpha ? Key::BLEND_PREMULT : Key::BLEND_NORMAL)
98 .set(Key::OPACITY_MASK,
99 description.mOpaque ? Key::OPACITY_OPAQUE : Key::OPACITY_TRANSLUCENT)
100 .set(Key::COLOR_MATRIX_MASK,
101 description.mColorMatrixEnabled ? Key::COLOR_MATRIX_ON : Key::COLOR_MATRIX_OFF);
105 String8 ProgramCache::generateVertexShader(const Key& needs) {
107 if (needs.isTexturing()) {
108 vs << "attribute vec4 texCoords;"
109 << "varying vec2 outTexCoords;";
111 vs << "attribute vec4 position;"
112 << "uniform mat4 projection;"
113 << "uniform mat4 texture;"
114 << "void main(void) {" << indent
115 << "gl_Position = projection * position;";
116 if (needs.isTexturing()) {
117 vs << "outTexCoords = (texture * texCoords).st;";
120 return vs.getString();
123 String8 ProgramCache::generateFragmentShader(const Key& needs) {
125 if (needs.getTextureTarget() == Key::TEXTURE_EXT) {
126 fs << "#extension GL_OES_EGL_image_external : require";
129 // default precision is required-ish in fragment shaders
130 fs << "precision mediump float;";
132 if (needs.getTextureTarget() == Key::TEXTURE_EXT) {
133 fs << "uniform samplerExternalOES sampler;"
134 << "varying vec2 outTexCoords;";
135 } else if (needs.getTextureTarget() == Key::TEXTURE_2D) {
136 fs << "uniform sampler2D sampler;"
137 << "varying vec2 outTexCoords;";
138 } else if (needs.getTextureTarget() == Key::TEXTURE_OFF) {
139 fs << "uniform vec4 color;";
141 if (needs.hasPlaneAlpha()) {
142 fs << "uniform float alphaPlane;";
144 if (needs.hasColorMatrix()) {
145 fs << "uniform mat4 colorMatrix;";
147 fs << "void main(void) {" << indent;
148 if (needs.isTexturing()) {
149 fs << "gl_FragColor = texture2D(sampler, outTexCoords);";
151 fs << "gl_FragColor = color;";
153 if (needs.isOpaque()) {
154 fs << "gl_FragColor.a = 1.0;";
156 if (needs.hasPlaneAlpha()) {
157 // modulate the alpha value with planeAlpha
158 if (needs.isPremultiplied()) {
159 // ... and the color too if we're premultiplied
160 fs << "gl_FragColor *= alphaPlane;";
162 fs << "gl_FragColor.a *= alphaPlane;";
166 if (needs.hasColorMatrix()) {
167 if (!needs.isOpaque() && needs.isPremultiplied()) {
168 // un-premultiply if needed before linearization
169 fs << "gl_FragColor.rgb = gl_FragColor.rgb/gl_FragColor.a;";
171 fs << "gl_FragColor.rgb = pow(gl_FragColor.rgb, vec3(2.2));";
172 fs << "vec4 transformed = colorMatrix * vec4(gl_FragColor.rgb, 1);";
173 fs << "gl_FragColor.rgb = transformed.rgb/transformed.a;";
174 fs << "gl_FragColor.rgb = pow(gl_FragColor.rgb, vec3(1.0 / 2.2));";
175 if (!needs.isOpaque() && needs.isPremultiplied()) {
176 // and re-premultiply if needed after gamma correction
177 fs << "gl_FragColor.rgb = gl_FragColor.rgb*gl_FragColor.a;";
182 return fs.getString();
185 Program* ProgramCache::generateProgram(const Key& needs) {
187 String8 vs = generateVertexShader(needs);
190 String8 fs = generateFragmentShader(needs);
192 Program* program = new Program(needs, vs.string(), fs.string());
196 void ProgramCache::useProgram(const Description& description) {
198 // generate the key for the shader based on the description
199 Key needs(computeKey(description));
201 // look-up the program in the cache
202 Program* program = mCache.valueFor(needs);
203 if (program == NULL) {
204 // we didn't find our program, so generate one...
205 nsecs_t time = -systemTime();
206 program = generateProgram(needs);
207 mCache.add(needs, program);
208 time += systemTime();
210 //ALOGD(">>> generated new program: needs=%08X, time=%u ms (%d programs)",
211 // needs.mNeeds, uint32_t(ns2ms(time)), mCache.size());
214 // here we have a suitable program for this description
215 if (program->isValid()) {
217 program->setUniforms(description);
222 } /* namespace android */