1/*
2 * Copyright (C) 2007 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 <stdlib.h>
18#include <stdio.h>
19#include <time.h>
20#include <sched.h>
21#include <sys/resource.h>
22
23#include <EGL/egl.h>
24#include <GLES2/gl2.h>
25#include <GLES2/gl2ext.h>
26
27#include <utils/Timers.h>
28
29#include <WindowSurface.h>
30#include <EGLUtils.h>
31
32using namespace android;
33
34static void printGLString(const char *name, GLenum s) {
35    // fprintf(stderr, "printGLString %s, %d\n", name, s);
36    const char *v = (const char *) glGetString(s);
37    // int error = glGetError();
38    // fprintf(stderr, "glGetError() = %d, result of glGetString = %x\n", error,
39    //        (unsigned int) v);
40    // if ((v < (const char*) 0) || (v > (const char*) 0x10000))
41    //    fprintf(stderr, "GL %s = %s\n", name, v);
42    // else
43    //    fprintf(stderr, "GL %s = (null) 0x%08x\n", name, (unsigned int) v);
44    fprintf(stderr, "GL %s = %s\n", name, v);
45}
46
47static void printEGLString(EGLDisplay dpy, const char *name, GLenum s) {
48    const char *v = (const char *) eglQueryString(dpy, s);
49    fprintf(stderr, "GL %s = %s\n", name, v);
50}
51
52static void checkEglError(const char* op, EGLBoolean returnVal = EGL_TRUE) {
53    if (returnVal != EGL_TRUE) {
54        fprintf(stderr, "%s() returned %d\n", op, returnVal);
55    }
56
57    for (EGLint error = eglGetError(); error != EGL_SUCCESS; error
58            = eglGetError()) {
59        fprintf(stderr, "after %s() eglError %s (0x%x)\n", op, EGLUtils::strerror(error),
60                error);
61    }
62}
63
64static void checkGlError(const char* op) {
65    for (GLint error = glGetError(); error; error
66            = glGetError()) {
67        fprintf(stderr, "after %s() glError (0x%x)\n", op, error);
68    }
69}
70
71static const char gVertexShader[] = "attribute vec4 vPosition;\n"
72    "void main() {\n"
73    "  gl_Position = vPosition;\n"
74    "}\n";
75
76static const char gFragmentShader[] = "precision mediump float;\n"
77    "void main() {\n"
78    "  gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
79    "}\n";
80
81GLuint loadShader(GLenum shaderType, const char* pSource) {
82    GLuint shader = glCreateShader(shaderType);
83    if (shader) {
84        glShaderSource(shader, 1, &pSource, NULL);
85        glCompileShader(shader);
86        GLint compiled = 0;
87        glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
88        if (!compiled) {
89            GLint infoLen = 0;
90            glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
91            if (infoLen) {
92                char* buf = (char*) malloc(infoLen);
93                if (buf) {
94                    glGetShaderInfoLog(shader, infoLen, NULL, buf);
95                    fprintf(stderr, "Could not compile shader %d:\n%s\n",
96                            shaderType, buf);
97                    free(buf);
98                }
99                glDeleteShader(shader);
100                shader = 0;
101            }
102        }
103    }
104    return shader;
105}
106
107GLuint createProgram(const char* pVertexSource, const char* pFragmentSource) {
108    GLuint vertexShader = loadShader(GL_VERTEX_SHADER, pVertexSource);
109    if (!vertexShader) {
110        return 0;
111    }
112
113    GLuint pixelShader = loadShader(GL_FRAGMENT_SHADER, pFragmentSource);
114    if (!pixelShader) {
115        return 0;
116    }
117
118    GLuint program = glCreateProgram();
119    if (program) {
120        glAttachShader(program, vertexShader);
121        checkGlError("glAttachShader");
122        glAttachShader(program, pixelShader);
123        checkGlError("glAttachShader");
124        glLinkProgram(program);
125        GLint linkStatus = GL_FALSE;
126        glGetProgramiv(program, GL_LINK_STATUS, &linkStatus);
127        if (linkStatus != GL_TRUE) {
128            GLint bufLength = 0;
129            glGetProgramiv(program, GL_INFO_LOG_LENGTH, &bufLength);
130            if (bufLength) {
131                char* buf = (char*) malloc(bufLength);
132                if (buf) {
133                    glGetProgramInfoLog(program, bufLength, NULL, buf);
134                    fprintf(stderr, "Could not link program:\n%s\n", buf);
135                    free(buf);
136                }
137            }
138            glDeleteProgram(program);
139            program = 0;
140        }
141    }
142    return program;
143}
144
145GLuint gProgram;
146GLuint gvPositionHandle;
147
148bool setupGraphics(int w, int h) {
149    gProgram = createProgram(gVertexShader, gFragmentShader);
150    if (!gProgram) {
151        return false;
152    }
153    gvPositionHandle = glGetAttribLocation(gProgram, "vPosition");
154    checkGlError("glGetAttribLocation");
155    fprintf(stderr, "glGetAttribLocation(\"vPosition\") = %d\n",
156            gvPositionHandle);
157
158    glViewport(0, 0, w, h);
159    checkGlError("glViewport");
160    return true;
161}
162
163const GLfloat gTriangleVertices[] = { 0.0f, 0.5f, -0.5f, -0.5f,
164        0.5f, -0.5f };
165
166void renderFrame() {
167    glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
168    checkGlError("glClearColor");
169    glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
170    checkGlError("glClear");
171
172    glUseProgram(gProgram);
173    checkGlError("glUseProgram");
174
175    glVertexAttribPointer(gvPositionHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices);
176    checkGlError("glVertexAttribPointer");
177    glEnableVertexAttribArray(gvPositionHandle);
178    checkGlError("glEnableVertexAttribArray");
179    glDrawArrays(GL_TRIANGLES, 0, 3);
180    checkGlError("glDrawArrays");
181}
182
183void printEGLConfiguration(EGLDisplay dpy, EGLConfig config) {
184
185#define X(VAL) {VAL, #VAL}
186    struct {EGLint attribute; const char* name;} names[] = {
187    X(EGL_BUFFER_SIZE),
188    X(EGL_ALPHA_SIZE),
189    X(EGL_BLUE_SIZE),
190    X(EGL_GREEN_SIZE),
191    X(EGL_RED_SIZE),
192    X(EGL_DEPTH_SIZE),
193    X(EGL_STENCIL_SIZE),
194    X(EGL_CONFIG_CAVEAT),
195    X(EGL_CONFIG_ID),
196    X(EGL_LEVEL),
197    X(EGL_MAX_PBUFFER_HEIGHT),
198    X(EGL_MAX_PBUFFER_PIXELS),
199    X(EGL_MAX_PBUFFER_WIDTH),
200    X(EGL_NATIVE_RENDERABLE),
201    X(EGL_NATIVE_VISUAL_ID),
202    X(EGL_NATIVE_VISUAL_TYPE),
203    X(EGL_SAMPLES),
204    X(EGL_SAMPLE_BUFFERS),
205    X(EGL_SURFACE_TYPE),
206    X(EGL_TRANSPARENT_TYPE),
207    X(EGL_TRANSPARENT_RED_VALUE),
208    X(EGL_TRANSPARENT_GREEN_VALUE),
209    X(EGL_TRANSPARENT_BLUE_VALUE),
210    X(EGL_BIND_TO_TEXTURE_RGB),
211    X(EGL_BIND_TO_TEXTURE_RGBA),
212    X(EGL_MIN_SWAP_INTERVAL),
213    X(EGL_MAX_SWAP_INTERVAL),
214    X(EGL_LUMINANCE_SIZE),
215    X(EGL_ALPHA_MASK_SIZE),
216    X(EGL_COLOR_BUFFER_TYPE),
217    X(EGL_RENDERABLE_TYPE),
218    X(EGL_CONFORMANT),
219   };
220#undef X
221
222    for (size_t j = 0; j < sizeof(names) / sizeof(names[0]); j++) {
223        EGLint value = -1;
224        EGLint returnVal = eglGetConfigAttrib(dpy, config, names[j].attribute, &value);
225        EGLint error = eglGetError();
226        if (returnVal && error == EGL_SUCCESS) {
227            printf(" %s: ", names[j].name);
228            printf("%d (0x%x)", value, value);
229        }
230    }
231    printf("\n");
232}
233
234int printEGLConfigurations(EGLDisplay dpy) {
235    EGLint numConfig = 0;
236    EGLint returnVal = eglGetConfigs(dpy, NULL, 0, &numConfig);
237    checkEglError("eglGetConfigs", returnVal);
238    if (!returnVal) {
239        return false;
240    }
241
242    printf("Number of EGL configuration: %d\n", numConfig);
243
244    EGLConfig* configs = (EGLConfig*) malloc(sizeof(EGLConfig) * numConfig);
245    if (! configs) {
246        printf("Could not allocate configs.\n");
247        return false;
248    }
249
250    returnVal = eglGetConfigs(dpy, configs, numConfig, &numConfig);
251    checkEglError("eglGetConfigs", returnVal);
252    if (!returnVal) {
253        free(configs);
254        return false;
255    }
256
257    for(int i = 0; i < numConfig; i++) {
258        printf("Configuration %d\n", i);
259        printEGLConfiguration(dpy, configs[i]);
260    }
261
262    free(configs);
263    return true;
264}
265
266int main(int argc, char** argv) {
267    EGLBoolean returnValue;
268    EGLConfig myConfig = {0};
269
270    EGLint context_attribs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
271    EGLint s_configAttribs[] = {
272            EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
273            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
274            EGL_NONE };
275    EGLint majorVersion;
276    EGLint minorVersion;
277    EGLContext context;
278    EGLSurface surface;
279    EGLint w, h;
280
281    EGLDisplay dpy;
282
283    checkEglError("<init>");
284    dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
285    checkEglError("eglGetDisplay");
286    if (dpy == EGL_NO_DISPLAY) {
287        printf("eglGetDisplay returned EGL_NO_DISPLAY.\n");
288        return 0;
289    }
290
291    returnValue = eglInitialize(dpy, &majorVersion, &minorVersion);
292    checkEglError("eglInitialize", returnValue);
293    fprintf(stderr, "EGL version %d.%d\n", majorVersion, minorVersion);
294    if (returnValue != EGL_TRUE) {
295        printf("eglInitialize failed\n");
296        return 0;
297    }
298
299    if (!printEGLConfigurations(dpy)) {
300        printf("printEGLConfigurations failed\n");
301        return 0;
302    }
303
304    checkEglError("printEGLConfigurations");
305
306    WindowSurface windowSurface;
307    EGLNativeWindowType window = windowSurface.getSurface();
308    returnValue = EGLUtils::selectConfigForNativeWindow(dpy, s_configAttribs, window, &myConfig);
309    if (returnValue) {
310        printf("EGLUtils::selectConfigForNativeWindow() returned %d", returnValue);
311        return 0;
312    }
313
314    checkEglError("EGLUtils::selectConfigForNativeWindow");
315
316    printf("Chose this configuration:\n");
317    printEGLConfiguration(dpy, myConfig);
318
319    surface = eglCreateWindowSurface(dpy, myConfig, window, NULL);
320    checkEglError("eglCreateWindowSurface");
321    if (surface == EGL_NO_SURFACE) {
322        printf("gelCreateWindowSurface failed.\n");
323        return 0;
324    }
325
326    context = eglCreateContext(dpy, myConfig, EGL_NO_CONTEXT, context_attribs);
327    checkEglError("eglCreateContext");
328    if (context == EGL_NO_CONTEXT) {
329        printf("eglCreateContext failed\n");
330        return 0;
331    }
332    returnValue = eglMakeCurrent(dpy, surface, surface, context);
333    checkEglError("eglMakeCurrent", returnValue);
334    if (returnValue != EGL_TRUE) {
335        return 0;
336    }
337    eglQuerySurface(dpy, surface, EGL_WIDTH, &w);
338    checkEglError("eglQuerySurface");
339    eglQuerySurface(dpy, surface, EGL_HEIGHT, &h);
340    checkEglError("eglQuerySurface");
341    GLint dim = w < h ? w : h;
342
343    fprintf(stderr, "Window dimensions: %d x %d\n", w, h);
344
345    printGLString("Version", GL_VERSION);
346    printGLString("Vendor", GL_VENDOR);
347    printGLString("Renderer", GL_RENDERER);
348    printGLString("Extensions", GL_EXTENSIONS);
349    printEGLString(dpy, "EGL Extensions", EGL_EXTENSIONS);
350
351    if(!setupGraphics(w, h)) {
352        fprintf(stderr, "Could not set up graphics.\n");
353        return 0;
354    }
355
356    for (;;) {
357        renderFrame();
358        eglSwapBuffers(dpy, surface);
359        checkEglError("eglSwapBuffers");
360    }
361
362    return 0;
363}
364