RenderEngine.cpp revision 19733a32799f792125913e746e8644d16f8dc223 
1/*
2 * Copyright 2013 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#include <cutils/log.h>
18#include <ui/Rect.h>
19#include <ui/Region.h>
20
21#include "RenderEngine.h"
22#include "GLES10RenderEngine.h"
23#include "GLES11RenderEngine.h"
24#include "GLES20RenderEngine.h"
25#include "GLExtensions.h"
26#include "Mesh.h"
27
28// ---------------------------------------------------------------------------
29namespace android {
30// ---------------------------------------------------------------------------
31
32RenderEngine* RenderEngine::create(EGLDisplay display, EGLConfig config) {
33    // Also create our EGLContext
34    EGLint contextAttributes[] = {
35            EGL_CONTEXT_CLIENT_VERSION, 2,      // MUST be first
36#ifdef EGL_IMG_context_priority
37#ifdef HAS_CONTEXT_PRIORITY
38#warning "using EGL_IMG_context_priority"
39            EGL_CONTEXT_PRIORITY_LEVEL_IMG, EGL_CONTEXT_PRIORITY_HIGH_IMG,
40#endif
41#endif
42            EGL_NONE, EGL_NONE
43    };
44
45    EGLContext ctxt = eglCreateContext(display, config, NULL, contextAttributes);
46    if (ctxt == EGL_NO_CONTEXT) {
47        // maybe ES 2.x is not supported
48        ALOGW("can't create an ES 2.x context, trying 1.x");
49        ctxt = eglCreateContext(display, config, NULL, contextAttributes + 2);
50    }
51
52    // if can't create a GL context, we can only abort.
53    LOG_ALWAYS_FATAL_IF(ctxt==EGL_NO_CONTEXT, "EGLContext creation failed");
54
55
56    // now figure out what version of GL did we actually get
57    // NOTE: a dummy surface is not needed if KHR_create_context is supported
58
59    EGLint attribs[] = { EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE, EGL_NONE };
60    EGLSurface dummy = eglCreatePbufferSurface(display, config, attribs);
61    LOG_ALWAYS_FATAL_IF(dummy==EGL_NO_SURFACE, "can't create dummy pbuffer");
62    EGLBoolean success = eglMakeCurrent(display, dummy, dummy, ctxt);
63    LOG_ALWAYS_FATAL_IF(!success, "can't make dummy pbuffer current");
64
65    GLExtensions& extensions(GLExtensions::getInstance());
66    extensions.initWithGLStrings(
67            glGetString(GL_VENDOR),
68            glGetString(GL_RENDERER),
69            glGetString(GL_VERSION),
70            glGetString(GL_EXTENSIONS));
71
72    GlesVersion version = parseGlesVersion( extensions.getVersion() );
73
74    // initialize the renderer while GL is current
75
76    RenderEngine* engine = NULL;
77    switch (version) {
78    case GLES_VERSION_1_0:
79        engine = new GLES10RenderEngine();
80        break;
81    case GLES_VERSION_1_1:
82        engine = new GLES11RenderEngine();
83        break;
84    case GLES_VERSION_2_0:
85    case GLES_VERSION_3_0:
86        engine = new GLES20RenderEngine();
87        break;
88    }
89    engine->setEGLContext(ctxt);
90
91    ALOGI("OpenGL ES informations:");
92    ALOGI("vendor    : %s", extensions.getVendor());
93    ALOGI("renderer  : %s", extensions.getRenderer());
94    ALOGI("version   : %s", extensions.getVersion());
95    ALOGI("extensions: %s", extensions.getExtension());
96    ALOGI("GL_MAX_TEXTURE_SIZE = %d", engine->getMaxTextureSize());
97    ALOGI("GL_MAX_VIEWPORT_DIMS = %d", engine->getMaxViewportDims());
98
99    eglMakeCurrent(display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
100    eglDestroySurface(display, dummy);
101
102    return engine;
103}
104
105RenderEngine::RenderEngine() : mEGLContext(EGL_NO_CONTEXT) {
106}
107
108RenderEngine::~RenderEngine() {
109}
110
111void RenderEngine::setEGLContext(EGLContext ctxt) {
112    mEGLContext = ctxt;
113}
114
115EGLContext RenderEngine::getEGLContext() const {
116    return mEGLContext;
117}
118
119void RenderEngine::checkErrors() const {
120    do {
121        // there could be more than one error flag
122        GLenum error = glGetError();
123        if (error == GL_NO_ERROR)
124            break;
125        ALOGE("GL error 0x%04x", int(error));
126    } while (true);
127}
128
129RenderEngine::GlesVersion RenderEngine::parseGlesVersion(const char* str) {
130    int major, minor;
131    if (sscanf(str, "OpenGL ES-CM %d.%d", &major, &minor) != 2) {
132        if (sscanf(str, "OpenGL ES %d.%d", &major, &minor) != 2) {
133            ALOGW("Unable to parse GL_VERSION string: \"%s\"", str);
134            return GLES_VERSION_1_0;
135        }
136    }
137
138    if (major == 1 && minor == 0) return GLES_VERSION_1_0;
139    if (major == 1 && minor >= 1) return GLES_VERSION_1_1;
140    if (major == 2 && minor >= 0) return GLES_VERSION_2_0;
141    if (major == 3 && minor >= 0) return GLES_VERSION_3_0;
142
143    ALOGW("Unrecognized OpenGL ES version: %d.%d", major, minor);
144    return GLES_VERSION_1_0;
145}
146
147void RenderEngine::fillRegionWithColor(const Region& region, uint32_t height,
148        float red, float green, float blue, float alpha) {
149    size_t c;
150    Rect const* r = region.getArray(&c);
151    Mesh mesh(Mesh::TRIANGLES, c*6, 2);
152    Mesh::VertexArray position(mesh.getPositionArray());
153    for (size_t i=0 ; i<c ; i++, r++) {
154        position[i*6 + 0].x = r->left;
155        position[i*6 + 0].y = height - r->top;
156        position[i*6 + 1].x = r->left;
157        position[i*6 + 1].y = height - r->bottom;
158        position[i*6 + 2].x = r->right;
159        position[i*6 + 2].y = height - r->bottom;
160        position[i*6 + 3].x = r->left;
161        position[i*6 + 3].y = height - r->top;
162        position[i*6 + 4].x = r->right;
163        position[i*6 + 4].y = height - r->bottom;
164        position[i*6 + 5].x = r->right;
165        position[i*6 + 5].y = height - r->top;
166    }
167    setupFillWithColor(red, green, blue, alpha);
168    drawMesh(mesh);
169}
170
171void RenderEngine::clearWithColor(float red, float green, float blue, float alpha) {
172    glClearColor(red, green, blue, alpha);
173    glClear(GL_COLOR_BUFFER_BIT);
174}
175
176void RenderEngine::setScissor(
177        uint32_t left, uint32_t bottom, uint32_t right, uint32_t top) {
178    glScissor(left, bottom, right, top);
179    glEnable(GL_SCISSOR_TEST);
180}
181
182void RenderEngine::disableScissor() {
183    glDisable(GL_SCISSOR_TEST);
184}
185
186void RenderEngine::genTextures(size_t count, uint32_t* names) {
187    glGenTextures(count, names);
188}
189
190void RenderEngine::deleteTextures(size_t count, uint32_t const* names) {
191    glDeleteTextures(count, names);
192}
193
194void RenderEngine::dump(String8& result) {
195    const GLExtensions& extensions(GLExtensions::getInstance());
196    result.appendFormat("GLES: %s, %s, %s\n",
197            extensions.getVendor(),
198            extensions.getRenderer(),
199            extensions.getVersion());
200    result.appendFormat("%s\n", extensions.getExtension());
201}
202
203// ---------------------------------------------------------------------------
204
205RenderEngine::BindImageAsFramebuffer::BindImageAsFramebuffer(
206        RenderEngine& engine, EGLImageKHR image) : mEngine(engine)
207{
208    mEngine.bindImageAsFramebuffer(image, &mTexName, &mFbName, &mStatus);
209
210    ALOGE_IF(mStatus != GL_FRAMEBUFFER_COMPLETE_OES,
211            "glCheckFramebufferStatusOES error %d", mStatus);
212}
213
214RenderEngine::BindImageAsFramebuffer::~BindImageAsFramebuffer() {
215    // back to main framebuffer
216    mEngine.unbindFramebuffer(mTexName, mFbName);
217}
218
219status_t RenderEngine::BindImageAsFramebuffer::getStatus() const {
220    return mStatus == GL_FRAMEBUFFER_COMPLETE_OES ? NO_ERROR : BAD_VALUE;
221}
222
223// ---------------------------------------------------------------------------
224}; // namespace android
225// ---------------------------------------------------------------------------
226