Opengl ES 2.0的示例代码

/* * This proprietary software may be used only as * authorised by a licensing agreement from ARM Limited * (C) COPYRIGHT 2009 - 2010 ARM Limited * ALL RIGHTS RESERVED * The entire notice above must be reproduced on all authorised * copies and copies may only be made to the extent permitted * by a licensing agreement from ARM Limited. */ #include "cube.h" #include "shader.h" #include "window.h" #include "matrix.h" #include "GLES2/gl2.h" #include "EGL/egl.h" #ifdef _WIN32 HWND hWindow; HDC hDisplay; #else Window hWindow; Display *hDisplay; #endif /* 3D data. Vertex range -0.5..0.5 in all axes. * Z -0.5 is near, 0.5 is far. */ const float aVertices[] = { /* Front face. */ /* Bottom left */ -0.5, 0.5, -0.5, 0.5, -0.5, -0.5, -0.5, -0.5, -0.5, /* Top right */ -0.5, 0.5, -0.5, 0.5, 0.5, -0.5, 0.5, -0.5, -0.5, /* Left face */ /* Bottom left */ -0.5, 0.5, 0.5, -0.5, -0.5, -0.5, -0.5, -0.5, 0.5, /* Top right */ -0.5, 0.5, 0.5, -0.5, 0.5, -0.5, -0.5, -0.5, -0.5, /* Top face */ /* Bottom left */ -0.5, 0.5, 0.5, 0.5, 0.5, -0.5, -0.5, 0.5, -0.5, /* Top right */ -0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, -0.5, /* Right face */ /* Bottom left */ 0.5, 0.5, -0.5, 0.5, -0.5, 0.5, 0.5, -0.5, -0.5, /* Top right */ 0.5, 0.5, -0.5, 0.5, 0.5, 0.5, 0.5, -0.5, 0.5, /* Back face */ /* Bottom left */ 0.5, 0.5, 0.5, -0.5, -0.5, 0.5, 0.5, -0.5, 0.5, /* Top right */ 0.5, 0.5, 0.5, -0.5, 0.5, 0.5, -0.5, -0.5, 0.5, /* Bottom face */ /* Bottom left */ -0.5, -0.5, -0.5, 0.5, -0.5, 0.5, -0.5, -0.5, 0.5, /* Top right */ -0.5, -0.5, -0.5, 0.5, -0.5, -0.5, 0.5, -0.5, 0.5, }; const float aColours[] = { /* Front face */ /* Bottom left */ 1.0, 0.0, 0.0, /* red */ 0.0, 0.0, 1.0, /* blue */ 0.0, 1.0, 0.0, /* green */ /* Top right */ 1.0, 0.0, 0.0, /* red */ 1.0, 1.0, 0.0, /* yellow */ 0.0, 0.0, 1.0, /* blue */ /* Left face */ /* Bottom left */ 1.0, 1.0, 1.0, /* white */ 0.0, 1.0, 0.0, /* green */ 0.0, 1.0, 1.0, /* cyan */ /* Top right */ 1.0, 1.0, 1.0, /* white */ 1.0, 0.0, 0.0, /* red */ 0.0, 1.0, 0.0, /* green */ /* Top face */ /* Bottom left */ 1.0, 1.0, 1.0, /* white */ 1.0, 1.0, 0.0, /* yellow */ 1.0, 0.0, 0.0, /* red */ /* Top right */ 1.0, 1.0, 1.0, /* white */ 0.0, 0.0, 0.0, /* black */ 1.0, 1.0, 0.0, /* yellow */ /* Right face */ /* Bottom left */ 1.0, 1.0, 0.0, /* yellow */ 1.0, 0.0, 1.0, /* magenta */ 0.0, 0.0, 1.0, /* blue */ /* Top right */ 1.0, 1.0, 0.0, /* yellow */ 0.0, 0.0, 0.0, /* black */ 1.0, 0.0, 1.0, /* magenta */ /* Back face */ /* Bottom left */ 0.0, 0.0, 0.0, /* black */ 0.0, 1.0, 1.0, /* cyan */ 1.0, 0.0, 1.0, /* magenta */ /* Top right */ 0.0, 0.0, 0.0, /* black */ 1.0, 1.0, 1.0, /* white */ 0.0, 1.0, 1.0, /* cyan */ /* Bottom face */ /* Bottom left */ 0.0, 1.0, 0.0, /* green */ 1.0, 0.0, 1.0, /* magenta */ 0.0, 1.0, 1.0, /* cyan */ /* Top right */ 0.0, 1.0, 0.0, /* green */ 0.0, 0.0, 1.0, /* blue */ 1.0, 0.0, 1.0, /* magenta */ }; int main(int argc, char **argv) { EGLDisplay sEGLDisplay; EGLContext sEGLContext; EGLSurface sEGLSurface; /* EGL Configuration */ EGLint aEGLAttributes[] = { EGL_RED_SIZE, 8, EGL_GREEN_SIZE, 8, EGL_BLUE_SIZE, 8, EGL_DEPTH_SIZE, 16, EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT, EGL_NONE }; EGLint aEGLContextAttributes[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE }; EGLConfig aEGLConfigs[1]; EGLint cEGLConfigs; #ifdef _WIN32 MSG sMessage; #else XSetWindowAttributes win_attrs; int attrs[64], idx = 0, num_config = 0; int major, minor; Colormap colormap; XVisualInfo *pVisual; XEvent e; #endif GLint iLocPosition = 0; GLint iLocColour, iLocTexCoord, iLocNormal, iLocMVP; GLint iLocXangle, iLocYangle, iLocZangle; GLint iLocAspect, iLocLightPos, iLocSampler, iLocSampler2; GLuint uiProgram, uiFragShader, uiVertShader; GLenum myTex, myTex2; int bDone = 0; const unsigned int uiWidth = 640; const unsigned int uiHeight = 480; int iXangle = 0, iYangle = 0, iZangle = 0; float aTBNmatrix1[9], aTBNmatrix2[9]; float aLightPos[] = { 0.0f, 0.0f, -1.0f }; // Light is nearest camera. unsigned char *myPixels = calloc(1, 128*128*4); // Holds texture data. unsigned char *myPixels2 = calloc(1, 128*128*4); // Holds texture data. float aRotate[16], aModelView[16], aPerspective[16], aMVP[16]; int i; /* EGL Init */ #ifdef _WIN32 hDisplay = GetDC(NULL); #else hDisplay = XOpenDisplay(NULL); #endif if (!hDisplay) { printf("Could not open display\n"); exit(-1); } sEGLDisplay = EGL_CHECK(eglGetDisplay(hDisplay)); EGL_CHECK(eglInitialize(sEGLDisplay, NULL, NULL)); EGL_CHECK(eglChooseConfig(sEGLDisplay, aEGLAttributes, aEGLConfigs, 1, &cEGLConfigs)); if (cEGLConfigs == 0) { printf("No EGL configurations were returned.\n"); exit(-1); } #ifdef _WIN32 hWindow = create_window(uiWidth, uiHeight); #else hWindow = create_window("OpenGL ES 2.0 Example on a Linux Desktop", uiWidth, uiHeight, hDisplay, sEGLDisplay, aEGLConfigs[0], &colormap, &pVisual); #endif sEGLSurface = EGL_CHECK(eglCreateWindowSurface(sEGLDisplay, aEGLConfigs[0], (EGLNativeWindowType)hWindow, NULL)); if (sEGLSurface == EGL_NO_SURFACE) { printf("Failed to create EGL surface.\n"); exit(-1); } sEGLContext = EGL_CHECK(eglCreateContext(sEGLDisplay, aEGLConfigs[0], EGL_NO_CONTEXT, aEGLContextAttributes)); if (sEGLContext == EGL_NO_CONTEXT) { printf("Failed to create EGL context.\n"); exit(-1); } EGL_CHECK(eglMakeCurrent(sEGLDisplay, sEGLSurface, sEGLSurface, sEGLContext)); /* Shader Initialisation */ process_shader(&uiVertShader, "shader.vert", GL_VERTEX_SHADER); process_shader(&uiFragShader, "shader.frag", GL_FRAGMENT_SHADER); /* Create uiProgram (ready to attach shaders) */ uiProgram = GL_CHECK(glCreateProgram()); /* Attach shaders and link uiProgram */ GL_CHECK(glAttachShader(uiProgram, uiVertShader)); GL_CHECK(glAttachShader(uiProgram, uiFragShader)); GL_CHECK(glLinkProgram(uiProgram)); /* Get attribute locations of non-fixed attributes like colour and texture coordinates. */ iLocPosition = GL_CHECK(glGetAttribLocation(uiProgram, "av4position")); iLocColour = GL_CHECK(glGetAttribLocation(uiProgram, "av3colour")); #ifdef DEBUG printf("iLocPosition = %i\n", iLocPosition); printf("iLocColour = %i\n", iLocColour); #endif /* Get uniform locations */ iLocMVP = GL_CHECK(glGetUniformLocation(uiProgram, "mvp")); #ifdef DEBUG printf("iLocMVP = %i\n", iLocMVP); #endif GL_CHECK(glUseProgram(uiProgram)); /* Enable attributes for position, colour and texture coordinates etc. */ GL_CHECK(glEnableVertexAttribArray(iLocPosition)); GL_CHECK(glEnableVertexAttribArray(iLocColour)); /* Populate attributes for position, colour and texture coordinates etc. */ GL_CHECK(glVertexAttribPointer(iLocPosition, 3, GL_FLOAT, GL_FALSE, 0, aVertices)); GL_CHECK(glVertexAttribPointer(iLocColour, 3, GL_FLOAT, GL_FALSE, 0, aColours)); GL_CHECK(glEnable(GL_CULL_FACE)); GL_CHECK(glEnable(GL_DEPTH_TEST)); #ifndef _WIN32 XSelectInput(hDisplay, hWindow, KeyPressMask | ExposureMask | EnterWindowMask | LeaveWindowMask | PointerMotionMask | VisibilityChangeMask | ButtonPressMask | ButtonReleaseMask | StructureNotifyMask); #endif /* Enter event loop */ while (!bDone) { #ifdef _WIN32 if(PeekMessage(&sMessage, NULL, 0, 0, PM_REMOVE)) { if(sMessage.message == WM_QUIT) { bDone = 1; } else { TranslateMessage(&sMessage); DispatchMessage(&sMessage); } } #else while (XPending(hDisplay) > 0) {