280 lines
8.5 KiB
C++
280 lines
8.5 KiB
C++
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <time.h>
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#include <sched.h>
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#include <sys/resource.h>
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#include <EGL/egl.h>
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#include <GLES2/gl2.h>
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#include <GLES2/gl2ext.h>
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#include <utils/Timers.h>
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#include <ui/FramebufferNativeWindow.h>
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#include <ui/EGLUtils.h>
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using namespace android;
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static void printGLString(const char *name, GLenum s) {
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// fprintf(stderr, "printGLString %s, %d\n", name, s);
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const char *v = (const char *) glGetString(s);
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// int error = glGetError();
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// fprintf(stderr, "glGetError() = %d, result of glGetString = %x\n", error,
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// (unsigned int) v);
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// if ((v < (const char*) 0) || (v > (const char*) 0x10000))
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// fprintf(stderr, "GL %s = %s\n", name, v);
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// else
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// fprintf(stderr, "GL %s = (null) 0x%08x\n", name, (unsigned int) v);
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fprintf(stderr, "GL %s = %s\n", name, v);
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}
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static void checkEglError(const char* op, EGLBoolean returnVal = EGL_TRUE) {
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if (returnVal != EGL_TRUE) {
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fprintf(stderr, "%s() returned %d\n", op, returnVal);
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}
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for (EGLint error = eglGetError(); error != EGL_SUCCESS; error
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= eglGetError()) {
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fprintf(stderr, "after %s() eglError %s (0x%x)\n", op, EGLUtils::strerror(error),
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error);
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}
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}
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static void checkGlError(const char* op) {
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for (GLint error = glGetError(); error; error
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= glGetError()) {
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fprintf(stderr, "after %s() glError (0x%x)\n", op, error);
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}
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}
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static const char gVertexShader[] = "attribute vec4 vPosition;\n"
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"void main() {\n"
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" gl_Position = vPosition;\n"
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"}\n";
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static const char gFragmentShader[] = "precision mediump float;\n"
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"void main() {\n"
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" gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
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"}\n";
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GLuint loadShader(GLenum shaderType, const char* pSource) {
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GLuint shader = glCreateShader(shaderType);
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if (shader) {
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glShaderSource(shader, 1, &pSource, NULL);
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glCompileShader(shader);
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GLint compiled = 0;
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glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
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if (!compiled) {
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GLint infoLen = 0;
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glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
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if (infoLen) {
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char* buf = (char*) malloc(infoLen);
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if (buf) {
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glGetShaderInfoLog(shader, infoLen, NULL, buf);
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fprintf(stderr, "Could not compile shader %d:\n%s\n",
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shaderType, buf);
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free(buf);
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}
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glDeleteShader(shader);
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shader = 0;
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}
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}
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}
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return shader;
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}
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GLuint createProgram(const char* pVertexSource, const char* pFragmentSource) {
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GLuint vertexShader = loadShader(GL_VERTEX_SHADER, pVertexSource);
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if (!vertexShader) {
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return 0;
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}
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GLuint pixelShader = loadShader(GL_FRAGMENT_SHADER, pFragmentSource);
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if (!pixelShader) {
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return 0;
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}
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GLuint program = glCreateProgram();
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if (program) {
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glAttachShader(program, vertexShader);
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checkGlError("glAttachShader");
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glAttachShader(program, pixelShader);
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checkGlError("glAttachShader");
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glLinkProgram(program);
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GLint linkStatus = GL_FALSE;
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glGetProgramiv(program, GL_LINK_STATUS, &linkStatus);
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if (linkStatus != GL_TRUE) {
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GLint bufLength = 0;
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glGetProgramiv(program, GL_INFO_LOG_LENGTH, &bufLength);
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if (bufLength) {
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char* buf = (char*) malloc(bufLength);
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if (buf) {
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glGetProgramInfoLog(program, bufLength, NULL, buf);
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fprintf(stderr, "Could not link program:\n%s\n", buf);
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free(buf);
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}
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}
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glDeleteProgram(program);
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program = 0;
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}
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}
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return program;
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}
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GLuint gProgram;
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GLuint gvPositionHandle;
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bool setupGraphics(int w, int h) {
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gProgram = createProgram(gVertexShader, gFragmentShader);
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if (!gProgram) {
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return false;
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}
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gvPositionHandle = glGetAttribLocation(gProgram, "vPosition");
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checkGlError("glGetAttribLocation");
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fprintf(stderr, "glGetAttribLocation(\"vPosition\") = %d\n",
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gvPositionHandle);
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glViewport(0, 0, w, h);
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checkGlError("glViewport");
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return true;
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}
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const GLfloat gTriangleVertices[] = { 0.0f, 0.5f, -0.5f, -0.5f,
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0.5f, -0.5f };
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void renderFrame() {
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glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
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checkGlError("glClearColor");
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glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
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checkGlError("glClear");
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glUseProgram(gProgram);
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checkGlError("glUseProgram");
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glVertexAttribPointer(gvPositionHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices);
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checkGlError("glVertexAttribPointer");
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glEnableVertexAttribArray(gvPositionHandle);
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checkGlError("glEnableVertexAttribArray");
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glDrawArrays(GL_TRIANGLES, 0, 3);
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checkGlError("glDrawArrays");
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}
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#if 0
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void PrintEGLConfig(EGLDisplay dpy, EGLConfig config) {
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int attrib[] = {EGL_RED_SIZE, EGL_GREEN_SIZE, EGL_BLUE_SIZE, EGL_ALPHA_SIZE,
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EGL_DEPTH_SIZE, EGL_SURFACE_TYPE, EGL_RENDERABLE_TYPE
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};
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for(size_t i = 0; i < sizeof(attrib)/sizeof(attrib[0]); i++) {
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int value = 0;
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int a = attrib[i];
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if (eglGetConfigAttrib(dpy, config, a, &value)) {
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printf(" 0x%04x: %d", a, value);
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}
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}
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printf("\n");
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}
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#endif
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int main(int argc, char** argv) {
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EGLBoolean returnValue;
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EGLConfig myConfig = {0};
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EGLint context_attribs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
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EGLint s_configAttribs[] = {
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EGL_SURFACE_TYPE, EGL_PBUFFER_BIT|EGL_WINDOW_BIT,
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EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
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EGL_NONE };
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EGLint majorVersion;
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EGLint minorVersion;
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EGLContext context;
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EGLSurface surface;
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EGLint w, h;
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EGLDisplay dpy;
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checkEglError("<init>");
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dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
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checkEglError("eglGetDisplay");
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if (dpy == EGL_NO_DISPLAY) {
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printf("eglGetDisplay returned EGL_NO_DISPLAY.\n");
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return 0;
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}
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returnValue = eglInitialize(dpy, &majorVersion, &minorVersion);
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checkEglError("eglInitialize", returnValue);
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fprintf(stderr, "EGL version %d.%d\n", majorVersion, minorVersion);
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if (returnValue != EGL_TRUE) {
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printf("eglInitialize failed\n");
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return 0;
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}
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EGLNativeWindowType window = android_createDisplaySurface();
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returnValue = EGLUtils::selectConfigForNativeWindow(dpy, s_configAttribs, window, &myConfig);
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if (returnValue) {
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printf("EGLUtils::selectConfigForNativeWindow() returned %d", returnValue);
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return 0;
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}
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surface = eglCreateWindowSurface(dpy, myConfig, window, NULL);
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checkEglError("eglCreateWindowSurface");
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if (surface == EGL_NO_SURFACE) {
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printf("gelCreateWindowSurface failed.\n");
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return 0;
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}
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context = eglCreateContext(dpy, myConfig, EGL_NO_CONTEXT, context_attribs);
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checkEglError("eglCreateContext");
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if (context == EGL_NO_CONTEXT) {
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printf("eglCreateContext failed\n");
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return 0;
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}
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returnValue = eglMakeCurrent(dpy, surface, surface, context);
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checkEglError("eglMakeCurrent", returnValue);
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if (returnValue != EGL_TRUE) {
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return 0;
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}
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eglQuerySurface(dpy, surface, EGL_WIDTH, &w);
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checkEglError("eglQuerySurface");
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eglQuerySurface(dpy, surface, EGL_HEIGHT, &h);
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checkEglError("eglQuerySurface");
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GLint dim = w < h ? w : h;
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fprintf(stderr, "Window dimensions: %d x %d\n", w, h);
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printGLString("Version", GL_VERSION);
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printGLString("Vendor", GL_VENDOR);
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printGLString("Renderer", GL_RENDERER);
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printGLString("Extensions", GL_EXTENSIONS);
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if(!setupGraphics(w, h)) {
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fprintf(stderr, "Could not set up graphics.\n");
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return 0;
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}
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for (;;) {
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renderFrame();
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eglSwapBuffers(dpy, surface);
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checkEglError("eglSwapBuffers");
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}
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return 0;
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}
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