gl2_basic.cpp revision 6ef57d7b368ebbac5f2b27c36a9032fee1cda8b1 
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 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
178void printEGLConfiguration(EGLDisplay dpy, EGLConfig config) {
179
180#define X(VAL) {VAL, #VAL}
181    struct {EGLint attribute; const char* name;} names[] = {
182    X(EGL_BUFFER_SIZE),
183    X(EGL_ALPHA_SIZE),
184    X(EGL_BLUE_SIZE),
185    X(EGL_GREEN_SIZE),
186    X(EGL_RED_SIZE),
187    X(EGL_DEPTH_SIZE),
188    X(EGL_STENCIL_SIZE),
189    X(EGL_CONFIG_CAVEAT),
190    X(EGL_CONFIG_ID),
191    X(EGL_LEVEL),
192    X(EGL_MAX_PBUFFER_HEIGHT),
193    X(EGL_MAX_PBUFFER_PIXELS),
194    X(EGL_MAX_PBUFFER_WIDTH),
195    X(EGL_NATIVE_RENDERABLE),
196    X(EGL_NATIVE_VISUAL_ID),
197    X(EGL_NATIVE_VISUAL_TYPE),
198    X(EGL_SAMPLES),
199    X(EGL_SAMPLE_BUFFERS),
200    X(EGL_SURFACE_TYPE),
201    X(EGL_TRANSPARENT_TYPE),
202    X(EGL_TRANSPARENT_RED_VALUE),
203    X(EGL_TRANSPARENT_GREEN_VALUE),
204    X(EGL_TRANSPARENT_BLUE_VALUE),
205    X(EGL_BIND_TO_TEXTURE_RGB),
206    X(EGL_BIND_TO_TEXTURE_RGBA),
207    X(EGL_MIN_SWAP_INTERVAL),
208    X(EGL_MAX_SWAP_INTERVAL),
209    X(EGL_LUMINANCE_SIZE),
210    X(EGL_ALPHA_MASK_SIZE),
211    X(EGL_COLOR_BUFFER_TYPE),
212    X(EGL_RENDERABLE_TYPE),
213    X(EGL_CONFORMANT),
214   };
215#undef X
216
217    for (size_t j = 0; j < sizeof(names) / sizeof(names[0]); j++) {
218        EGLint value = -1;
219        EGLint returnVal = eglGetConfigAttrib(dpy, config, names[j].attribute, &value);
220        EGLint error = eglGetError();
221        if (returnVal && error == EGL_SUCCESS) {
222            printf(" %s: ", names[j].name);
223            printf("%d (0x%x)", value, value);
224        }
225    }
226    printf("\n");
227}
228
229int printEGLConfigurations(EGLDisplay dpy) {
230    EGLint numConfig = 0;
231    EGLint returnVal = eglGetConfigs(dpy, NULL, 0, &numConfig);
232    checkEglError("eglGetConfigs", returnVal);
233    if (!returnVal) {
234        return false;
235    }
236
237    printf("Number of EGL configuration: %d\n", numConfig);
238
239    EGLConfig* configs = (EGLConfig*) malloc(sizeof(EGLConfig) * numConfig);
240    if (! configs) {
241        printf("Could not allocate configs.\n");
242        return false;
243    }
244
245    returnVal = eglGetConfigs(dpy, configs, numConfig, &numConfig);
246    checkEglError("eglGetConfigs", returnVal);
247    if (!returnVal) {
248        free(configs);
249        return false;
250    }
251
252    for(int i = 0; i < numConfig; i++) {
253        printf("Configuration %d\n", i);
254        printEGLConfiguration(dpy, configs[i]);
255    }
256
257    free(configs);
258    return true;
259}
260
261int main(int argc, char** argv) {
262    EGLBoolean returnValue;
263    EGLConfig myConfig = {0};
264
265    EGLint context_attribs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
266    EGLint s_configAttribs[] = {
267            EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
268            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
269            EGL_NONE };
270    EGLint majorVersion;
271    EGLint minorVersion;
272    EGLContext context;
273    EGLSurface surface;
274    EGLint w, h;
275
276    EGLDisplay dpy;
277
278    checkEglError("<init>");
279    dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
280    checkEglError("eglGetDisplay");
281    if (dpy == EGL_NO_DISPLAY) {
282        printf("eglGetDisplay returned EGL_NO_DISPLAY.\n");
283        return 0;
284    }
285
286    returnValue = eglInitialize(dpy, &majorVersion, &minorVersion);
287    checkEglError("eglInitialize", returnValue);
288    fprintf(stderr, "EGL version %d.%d\n", majorVersion, minorVersion);
289    if (returnValue != EGL_TRUE) {
290        printf("eglInitialize failed\n");
291        return 0;
292    }
293
294    if (!printEGLConfigurations(dpy)) {
295        printf("printEGLConfigurations failed\n");
296        return 0;
297    }
298
299    checkEglError("printEGLConfigurations");
300
301    WindowSurface windowSurface;
302    EGLNativeWindowType window = windowSurface.getSurface();
303    returnValue = EGLUtils::selectConfigForNativeWindow(dpy, s_configAttribs, window, &myConfig);
304    if (returnValue) {
305        printf("EGLUtils::selectConfigForNativeWindow() returned %d", returnValue);
306        return 0;
307    }
308
309    checkEglError("EGLUtils::selectConfigForNativeWindow");
310
311    printf("Chose this configuration:\n");
312    printEGLConfiguration(dpy, myConfig);
313
314    surface = eglCreateWindowSurface(dpy, myConfig, window, NULL);
315    checkEglError("eglCreateWindowSurface");
316    if (surface == EGL_NO_SURFACE) {
317        printf("gelCreateWindowSurface failed.\n");
318        return 0;
319    }
320
321    context = eglCreateContext(dpy, myConfig, EGL_NO_CONTEXT, context_attribs);
322    checkEglError("eglCreateContext");
323    if (context == EGL_NO_CONTEXT) {
324        printf("eglCreateContext failed\n");
325        return 0;
326    }
327    returnValue = eglMakeCurrent(dpy, surface, surface, context);
328    checkEglError("eglMakeCurrent", returnValue);
329    if (returnValue != EGL_TRUE) {
330        return 0;
331    }
332    eglQuerySurface(dpy, surface, EGL_WIDTH, &w);
333    checkEglError("eglQuerySurface");
334    eglQuerySurface(dpy, surface, EGL_HEIGHT, &h);
335    checkEglError("eglQuerySurface");
336    GLint dim = w < h ? w : h;
337
338    fprintf(stderr, "Window dimensions: %d x %d\n", w, h);
339
340    printGLString("Version", GL_VERSION);
341    printGLString("Vendor", GL_VENDOR);
342    printGLString("Renderer", GL_RENDERER);
343    printGLString("Extensions", GL_EXTENSIONS);
344
345    if(!setupGraphics(w, h)) {
346        fprintf(stderr, "Could not set up graphics.\n");
347        return 0;
348    }
349
350    for (;;) {
351        renderFrame();
352        eglSwapBuffers(dpy, surface);
353        checkEglError("eglSwapBuffers");
354    }
355
356    return 0;
357}
358