gl2_basic.cpp revision d9872bf424ad327861ab98390319566b25571f76 
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 <ui/FramebufferNativeWindow.h>
30#include <ui/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 checkEglError(const char* op, EGLBoolean returnVal = EGL_TRUE) {
48    if (returnVal != EGL_TRUE) {
49        fprintf(stderr, "%s() returned %d\n", op, returnVal);
50    }
51
52    for (EGLint error = eglGetError(); error != EGL_SUCCESS; error
53            = eglGetError()) {
54        fprintf(stderr, "after %s() eglError %s (0x%x)\n", op, EGLUtils::strerror(error),
55                error);
56    }
57}
58
59static void checkGlError(const char* op) {
60    for (GLint error = glGetError(); error; error
61            = glGetError()) {
62        fprintf(stderr, "after %s() glError (0x%x)\n", op, error);
63    }
64}
65
66static const char gVertexShader[] = "attribute vec4 vPosition;\n"
67    "void main() {\n"
68    "  gl_Position = vPosition;\n"
69    "}\n";
70
71static const char gFragmentShader[] = "precision mediump float;\n"
72    "void main() {\n"
73    "  gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
74    "}\n";
75
76GLuint loadShader(GLenum shaderType, const char* pSource) {
77    GLuint shader = glCreateShader(shaderType);
78    if (shader) {
79        glShaderSource(shader, 1, &pSource, NULL);
80        glCompileShader(shader);
81        GLint compiled = 0;
82        glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
83        if (!compiled) {
84            GLint infoLen = 0;
85            glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
86            if (infoLen) {
87                char* buf = (char*) malloc(infoLen);
88                if (buf) {
89                    glGetShaderInfoLog(shader, infoLen, NULL, buf);
90                    fprintf(stderr, "Could not compile shader %d:\n%s\n",
91                            shaderType, buf);
92                    free(buf);
93                }
94                glDeleteShader(shader);
95                shader = 0;
96            }
97        }
98    }
99    return shader;
100}
101
102GLuint createProgram(const char* pVertexSource, const char* pFragmentSource) {
103    GLuint vertexShader = loadShader(GL_VERTEX_SHADER, pVertexSource);
104    if (!vertexShader) {
105        return 0;
106    }
107
108    GLuint pixelShader = loadShader(GL_FRAGMENT_SHADER, pFragmentSource);
109    if (!pixelShader) {
110        return 0;
111    }
112
113    GLuint program = glCreateProgram();
114    if (program) {
115        glAttachShader(program, vertexShader);
116        checkGlError("glAttachShader");
117        glAttachShader(program, pixelShader);
118        checkGlError("glAttachShader");
119        glLinkProgram(program);
120        GLint linkStatus = GL_FALSE;
121        glGetProgramiv(program, GL_LINK_STATUS, &linkStatus);
122        if (linkStatus != GL_TRUE) {
123            GLint bufLength = 0;
124            glGetProgramiv(program, GL_INFO_LOG_LENGTH, &bufLength);
125            if (bufLength) {
126                char* buf = (char*) malloc(bufLength);
127                if (buf) {
128                    glGetProgramInfoLog(program, bufLength, NULL, buf);
129                    fprintf(stderr, "Could not link program:\n%s\n", buf);
130                    free(buf);
131                }
132            }
133            glDeleteProgram(program);
134            program = 0;
135        }
136    }
137    return program;
138}
139
140GLuint gProgram;
141GLuint gvPositionHandle;
142
143bool setupGraphics(int w, int h) {
144    gProgram = createProgram(gVertexShader, gFragmentShader);
145    if (!gProgram) {
146        return false;
147    }
148    gvPositionHandle = glGetAttribLocation(gProgram, "vPosition");
149    checkGlError("glGetAttribLocation");
150    fprintf(stderr, "glGetAttribLocation(\"vPosition\") = %d\n",
151            gvPositionHandle);
152
153    glViewport(0, 0, w, h);
154    checkGlError("glViewport");
155    return true;
156}
157
158const GLfloat gTriangleVertices[] = { 0.0f, 0.5f, -0.5f, -0.5f,
159        0.5f, -0.5f };
160
161void renderFrame() {
162    glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
163    checkGlError("glClearColor");
164    glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
165    checkGlError("glClear");
166
167    glUseProgram(gProgram);
168    checkGlError("glUseProgram");
169
170    glVertexAttribPointer(gvPositionHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices);
171    checkGlError("glVertexAttribPointer");
172    glEnableVertexAttribArray(gvPositionHandle);
173    checkGlError("glEnableVertexAttribArray");
174    glDrawArrays(GL_TRIANGLES, 0, 3);
175    checkGlError("glDrawArrays");
176}
177
178#if 0
179
180void PrintEGLConfig(EGLDisplay dpy, EGLConfig config) {
181    int attrib[] = {EGL_RED_SIZE, EGL_GREEN_SIZE, EGL_BLUE_SIZE, EGL_ALPHA_SIZE,
182            EGL_DEPTH_SIZE, EGL_SURFACE_TYPE, EGL_RENDERABLE_TYPE
183    };
184    for(size_t i = 0; i < sizeof(attrib)/sizeof(attrib[0]); i++) {
185        int value = 0;
186        int a = attrib[i];
187        if (eglGetConfigAttrib(dpy, config, a, &value)) {
188            printf(" 0x%04x: %d", a, value);
189        }
190    }
191    printf("\n");
192}
193
194#endif
195
196int printEGLConfigurations(EGLDisplay dpy) {
197    EGLint numConfig = 0;
198    EGLint returnVal = eglGetConfigs(dpy, NULL, 0, &numConfig);
199    checkEglError("eglGetConfigs", returnVal);
200    if (!returnVal) {
201        return false;
202    }
203
204    printf("Number of EGL configuration: %d\n", numConfig);
205
206    EGLConfig* configs = (EGLConfig*) malloc(sizeof(EGLConfig) * numConfig);
207    if (! configs) {
208        printf("Could not allocate configs.\n");
209        return false;
210    }
211
212    returnVal = eglGetConfigs(dpy, NULL, 0, &numConfig);
213    checkEglError("eglGetConfigs", returnVal);
214    if (!returnVal) {
215        free(configs);
216        return false;
217    }
218
219#define X(VAL) {VAL, #VAL}
220    struct {EGLint attribute; const char* name;} names[] = {
221    X(EGL_BUFFER_SIZE),
222    X(EGL_RED_SIZE),
223    X(EGL_GREEN_SIZE),
224    X(EGL_BLUE_SIZE),
225    X(EGL_ALPHA_SIZE),
226    X(EGL_CONFIG_CAVEAT),
227    X(EGL_CONFIG_ID),
228    X(EGL_DEPTH_SIZE),
229    X(EGL_LEVEL),
230    X(EGL_MAX_PBUFFER_WIDTH),
231    X(EGL_MAX_PBUFFER_HEIGHT),
232    X(EGL_MAX_PBUFFER_PIXELS),
233    X(EGL_NATIVE_RENDERABLE),
234    X(EGL_NATIVE_VISUAL_ID),
235    X(EGL_NATIVE_VISUAL_TYPE),
236    X(EGL_PRESERVED_RESOURCES),
237    X(EGL_SAMPLE_BUFFERS),
238    X(EGL_SAMPLES),
239    // X(EGL_STENCIL_BITS),
240    X(EGL_SURFACE_TYPE),
241    X(EGL_TRANSPARENT_TYPE),
242    // X(EGL_TRANSPARENT_RED),
243    // X(EGL_TRANSPARENT_GREEN),
244    // X(EGL_TRANSPARENT_BLUE)
245    };
246#undef X
247
248    for(int i = 0; i < numConfig; i++) {
249        printf("Configuration %d\n", i);
250        EGLConfig config = configs[i];
251        for (int j = 0; j < sizeof(names) / sizeof(names[0]); j++) {
252            EGLint value = -1;
253            returnVal = eglGetConfigAttrib(dpy, config, names[j].attribute, &value);
254            if (returnVal) {
255                printf(" %s: %d (0x%x)", names[j].name, value, value);
256            }
257        }
258        printf("\n");
259    }
260
261    free(configs);
262    return true;
263}
264
265int main(int argc, char** argv) {
266    EGLBoolean returnValue;
267    EGLConfig myConfig = {0};
268
269    EGLint context_attribs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
270    EGLint s_configAttribs[] = {
271            EGL_SURFACE_TYPE, EGL_PBUFFER_BIT|EGL_WINDOW_BIT,
272            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
273            EGL_NONE };
274    EGLint majorVersion;
275    EGLint minorVersion;
276    EGLContext context;
277    EGLSurface surface;
278    EGLint w, h;
279
280    EGLDisplay dpy;
281
282    checkEglError("<init>");
283    dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
284    checkEglError("eglGetDisplay");
285    if (dpy == EGL_NO_DISPLAY) {
286        printf("eglGetDisplay returned EGL_NO_DISPLAY.\n");
287        return 0;
288    }
289
290    returnValue = eglInitialize(dpy, &majorVersion, &minorVersion);
291    checkEglError("eglInitialize", returnValue);
292    fprintf(stderr, "EGL version %d.%d\n", majorVersion, minorVersion);
293    if (returnValue != EGL_TRUE) {
294        printf("eglInitialize failed\n");
295        return 0;
296    }
297
298    if (!printEGLConfigurations(dpy)) {
299        printf("printEGLConfigurations failed\n");
300        return 0;
301    }
302
303    EGLNativeWindowType window = android_createDisplaySurface();
304    returnValue = EGLUtils::selectConfigForNativeWindow(dpy, s_configAttribs, window, &myConfig);
305    if (returnValue) {
306        printf("EGLUtils::selectConfigForNativeWindow() returned %d", returnValue);
307        return 0;
308    }
309
310    surface = eglCreateWindowSurface(dpy, myConfig, window, NULL);
311    checkEglError("eglCreateWindowSurface");
312    if (surface == EGL_NO_SURFACE) {
313        printf("gelCreateWindowSurface failed.\n");
314        return 0;
315    }
316
317    context = eglCreateContext(dpy, myConfig, EGL_NO_CONTEXT, context_attribs);
318    checkEglError("eglCreateContext");
319    if (context == EGL_NO_CONTEXT) {
320        printf("eglCreateContext failed\n");
321        return 0;
322    }
323    returnValue = eglMakeCurrent(dpy, surface, surface, context);
324    checkEglError("eglMakeCurrent", returnValue);
325    if (returnValue != EGL_TRUE) {
326        return 0;
327    }
328    eglQuerySurface(dpy, surface, EGL_WIDTH, &w);
329    checkEglError("eglQuerySurface");
330    eglQuerySurface(dpy, surface, EGL_HEIGHT, &h);
331    checkEglError("eglQuerySurface");
332    GLint dim = w < h ? w : h;
333
334    fprintf(stderr, "Window dimensions: %d x %d\n", w, h);
335
336    printGLString("Version", GL_VERSION);
337    printGLString("Vendor", GL_VENDOR);
338    printGLString("Renderer", GL_RENDERER);
339    printGLString("Extensions", GL_EXTENSIONS);
340
341    if(!setupGraphics(w, h)) {
342        fprintf(stderr, "Could not set up graphics.\n");
343        return 0;
344    }
345
346    for (;;) {
347        renderFrame();
348        eglSwapBuffers(dpy, surface);
349        checkEglError("eglSwapBuffers");
350    }
351
352    return 0;
353}
354