const char* PezInitialize(int width, int height)
{
BuddhaMesh = CreateMesh("buddha.ctm");
QuadVbo = CreateQuad(-1, -1, 1, 1);
#ifdef LIGHTING
DepthProgram = CreateProgram("Glass.Vertex", "Glass.Fragment.Lighting" SUFFIX);
AbsorptionProgram = CreateProgram("Glass.Vertex.Quad", "Glass.Fragment.Blit" SUFFIX);
#else
DepthProgram = CreateProgram("Glass.Vertex", "Glass.Fragment.Depth" SUFFIX);
AbsorptionProgram = CreateProgram("Glass.Vertex.Quad", "Glass.Fragment.Absorption" SUFFIX);
#endif
// Create a floating-point render target:
GLuint textureHandle;
glGenTextures(1, &textureHandle);
glBindTexture(GL_TEXTURE_2D, textureHandle);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
#ifdef LIGHTING
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 768, 1024, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
#elif defined(__IPAD__)
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 768, 1024, 0, GL_LUMINANCE, GL_HALF_FLOAT_OES, 0);
#else
glTexImage2D(GL_TEXTURE_2D, 0, GL_RG16F, 768, 1024, 0, GL_RG, GL_FLOAT, 0);
#endif
PezCheckCondition(GL_NO_ERROR == glGetError(), "This passes on Mac OS X and iOS.");
OffscreenTexture = textureHandle;
GLuint fboHandle;
glGenFramebuffers(1, &fboHandle);
glBindFramebuffer(GL_FRAMEBUFFER, fboHandle);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, textureHandle, 0);
#ifdef LIGHTING
GLuint depthRenderbuffer;
glGenRenderbuffers(1, &depthRenderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, depthRenderbuffer);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, width, height);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthRenderbuffer);
#endif
PezCheckCondition(GL_FRAMEBUFFER_COMPLETE == glCheckFramebufferStatus(GL_FRAMEBUFFER), "This asserts on iOS and passes on Mac OS X.");
OffscreenFbo = fboHandle;
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
// Set up the projection matrix:
const float HalfWidth = 0.5;
const float HalfHeight = HalfWidth * PEZ_VIEWPORT_HEIGHT / PEZ_VIEWPORT_WIDTH;
ProjectionMatrix = M4MakeFrustum(-HalfWidth, +HalfWidth, -HalfHeight, +HalfHeight, 5, 20);
return "Glass Demo";
}
GLuint CreateProgram(const char* vsKey, const char* fsKey)
{
static int first = 1;
if (first)
{
glswInit();
glswAddPath("../", ".glsl");
glswAddPath("./", ".glsl");
char qualifiedPath[128];
strcpy(qualifiedPath, PezResourcePath());
strcat(qualifiedPath, "/");
glswAddPath(qualifiedPath, ".glsl");
first = 0;
}
const char* vsSource = glswGetShader(vsKey);
const char* fsSource = glswGetShader(fsKey);
const char* msg = "Can't find %s shader: '%s'.\n";
PezCheckCondition(vsSource != 0, msg, "vertex", vsKey);
PezCheckCondition(fsSource != 0, msg, "fragment", fsKey);
GLint compileSuccess;
GLchar compilerSpew[256];
GLuint vsHandle = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vsHandle, 1, &vsSource, 0);
glCompileShader(vsHandle);
glGetShaderiv(vsHandle, GL_COMPILE_STATUS, &compileSuccess);
glGetShaderInfoLog(vsHandle, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition(compileSuccess, "Can't compile %s:\n%s", vsKey, compilerSpew);
GLuint fsHandle = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fsHandle, 1, &fsSource, 0);
glCompileShader(fsHandle);
glGetShaderiv(fsHandle, GL_COMPILE_STATUS, &compileSuccess);
glGetShaderInfoLog(fsHandle, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition(compileSuccess, "Can't compile %s:\n%s", fsKey, compilerSpew);
GLuint programHandle = glCreateProgram();
glAttachShader(programHandle, vsHandle);
glAttachShader(programHandle, fsHandle);
glLinkProgram(programHandle);
GLint linkSuccess;
glGetProgramiv(programHandle, GL_LINK_STATUS, &linkSuccess);
glGetProgramInfoLog(programHandle, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition(linkSuccess, "Can't link %s with %s:\n%s", vsKey, fsKey, compilerSpew);
return programHandle;
}
Surface CreateSurface(GLsizei width, GLsizei height, int numComponents)
{
GLuint fboHandle;
glGenFramebuffers(1, &fboHandle);
glBindFramebuffer(GL_FRAMEBUFFER, fboHandle);
GLuint textureHandle;
glGenTextures(1, &textureHandle);
glBindTexture(GL_TEXTURE_2D, textureHandle);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
const int UseHalfFloats = 1;
if (UseHalfFloats) {
switch (numComponents) {
case 1: glTexImage2D(GL_TEXTURE_2D, 0, GL_R16F, width, height, 0, GL_RED, GL_HALF_FLOAT, 0); break;
case 2: glTexImage2D(GL_TEXTURE_2D, 0, GL_RG16F, width, height, 0, GL_RG, GL_HALF_FLOAT, 0); break;
case 3: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGB, GL_HALF_FLOAT, 0); break;
case 4: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, width, height, 0, GL_RGBA, GL_HALF_FLOAT, 0); break;
default: PezFatalError("Illegal slab format.");
}
} else {
switch (numComponents) {
case 1: glTexImage2D(GL_TEXTURE_2D, 0, GL_R32F, width, height, 0, GL_RED, GL_FLOAT, 0); break;
case 2: glTexImage2D(GL_TEXTURE_2D, 0, GL_RG32F, width, height, 0, GL_RG, GL_FLOAT, 0); break;
case 3: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB32F, width, height, 0, GL_RGB, GL_FLOAT, 0); break;
case 4: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, width, height, 0, GL_RGBA, GL_FLOAT, 0); break;
default: PezFatalError("Illegal slab format.");
}
}
PezCheckCondition(GL_NO_ERROR == glGetError(), "Unable to create normals texture");
GLuint colorbuffer;
glGenRenderbuffers(1, &colorbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, colorbuffer);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, textureHandle, 0);
PezCheckCondition(GL_NO_ERROR == glGetError(), "Unable to attach color buffer");
PezCheckCondition(GL_FRAMEBUFFER_COMPLETE == glCheckFramebufferStatus(GL_FRAMEBUFFER), "Unable to create FBO.");
Surface surface = { fboHandle, textureHandle, numComponents };
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
return surface;
}
static void LoadEffect()
{
const char* vsSource, * fsSource;
GLuint vsHandle, fsHandle;
GLint compileSuccess, linkSuccess;
GLchar compilerSpew[256];
GLuint programHandle;
glswInit();
glswSetPath("../demo/", ".glsl");
glswAddDirectiveToken("GL3", "#version 130");
vsSource = glswGetShader("Simple.Vertex.Textured." PEZ_GL_VERSION_TOKEN);
fsSource = glswGetShader("Simple.Fragment.Textured." PEZ_GL_VERSION_TOKEN);
PezCheckCondition(vsSource, "Can't find vertex shader.\n");
PezCheckCondition(fsSource, "Can't find fragment shader.\n");
vsHandle = glCreateShader(GL_VERTEX_SHADER);
fsHandle = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vsHandle, 1, &vsSource, 0);
glCompileShader(vsHandle);
glGetShaderiv(vsHandle, GL_COMPILE_STATUS, &compileSuccess);
glGetShaderInfoLog(vsHandle, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition(compileSuccess, compilerSpew);
glShaderSource(fsHandle, 1, &fsSource, 0);
glCompileShader(fsHandle);
glGetShaderiv(fsHandle, GL_COMPILE_STATUS, &compileSuccess);
glGetShaderInfoLog(fsHandle, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition(compileSuccess, compilerSpew);
programHandle = glCreateProgram();
glAttachShader(programHandle, vsHandle);
glAttachShader(programHandle, fsHandle);
glBindAttribLocation(programHandle, PositionSlot, "Position");
glBindAttribLocation(programHandle, TexCoordSlot, "InCoord");
glLinkProgram(programHandle);
glGetProgramiv(programHandle, GL_LINK_STATUS, &linkSuccess);
glGetProgramInfoLog(programHandle, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition(linkSuccess, compilerSpew);
glUseProgram(programHandle);
}
INT WINAPI WinMain(HINSTANCE hInst, HINSTANCE ignoreMe0, LPSTR ignoreMe1, INT ignoreMe2)
{
LPCSTR szName = "Pez App";
WNDCLASSEXA wc = { sizeof(WNDCLASSEX), CS_CLASSDC | CS_DBLCLKS, MsgProc, 0L, 0L, GetModuleHandle(0), 0, 0, 0, 0, szName, 0 };
DWORD dwStyle = WS_SYSMENU | WS_VISIBLE | WS_POPUP;
DWORD dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;
RECT rect;
int windowWidth, windowHeight, windowLeft, windowTop;
HWND hWnd;
PIXELFORMATDESCRIPTOR pfd;
HDC hDC;
HGLRC hRC;
int pixelFormat;
GLenum err;
MSG msg = {0};
LARGE_INTEGER previousTime;
LARGE_INTEGER freqTime;
wc.hCursor = LoadCursor(0, IDC_ARROW);
RegisterClassExA(&wc);
SetRect(&rect, 0, 0, PEZ_VIEWPORT_WIDTH, PEZ_VIEWPORT_HEIGHT);
AdjustWindowRectEx(&rect, dwStyle, FALSE, dwExStyle);
windowWidth = rect.right - rect.left;
windowHeight = rect.bottom - rect.top;
windowLeft = GetSystemMetrics(SM_XVIRTUALSCREEN) + GetSystemMetrics(SM_CXSCREEN) / 2 - windowWidth / 2;
windowTop = GetSystemMetrics(SM_CYSCREEN) / 2 - windowHeight / 2;
hWnd = CreateWindowExA(0, szName, szName, dwStyle, windowLeft, windowTop, windowWidth, windowHeight, 0, 0, 0, 0);
// Create the GL context.
ZeroMemory(&pfd, sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cDepthBits = 0;
pfd.cStencilBits = 0;
pfd.iLayerType = PFD_MAIN_PLANE;
hDC = GetDC(hWnd);
pixelFormat = ChoosePixelFormat(hDC, &pfd);
SetPixelFormat(hDC, pixelFormat, &pfd);
hRC = wglCreateContext(hDC);
wglMakeCurrent(hDC, hRC);
if (PEZ_ENABLE_MULTISAMPLING)
{
int pixelAttribs[] =
{
WGL_SAMPLES_ARB, 16,
WGL_SAMPLE_BUFFERS_ARB, GL_TRUE,
WGL_DRAW_TO_WINDOW_ARB, GL_TRUE,
WGL_SUPPORT_OPENGL_ARB, GL_TRUE,
WGL_ACCELERATION_ARB, WGL_FULL_ACCELERATION_ARB,
WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB,
WGL_RED_BITS_ARB, 8,
WGL_GREEN_BITS_ARB, 8,
WGL_BLUE_BITS_ARB, 8,
WGL_ALPHA_BITS_ARB, 8,
WGL_DEPTH_BITS_ARB, 24,
WGL_STENCIL_BITS_ARB, 8,
WGL_DOUBLE_BUFFER_ARB, GL_TRUE,
0
};
int* sampleCount = pixelAttribs + 1;
int* useSampleBuffer = pixelAttribs + 3;
int pixelFormat = -1;
PROC proc = wglGetProcAddress("wglChoosePixelFormatARB");
unsigned int numFormats;
PFNWGLCHOOSEPIXELFORMATARBPROC wglChoosePixelFormatARB = (PFNWGLCHOOSEPIXELFORMATARBPROC) proc;
if (!wglChoosePixelFormatARB)
{
PezFatalError("Could not load function pointer for 'wglChoosePixelFormatARB'. Is your driver properly installed?");
}
// Try fewer and fewer samples per pixel till we find one that is supported:
while (pixelFormat <= 0 && *sampleCount >= 0)
{
wglChoosePixelFormatARB(hDC, pixelAttribs, 0, 1, &pixelFormat, &numFormats);
(*sampleCount)--;
if (*sampleCount <= 1)
{
*useSampleBuffer = GL_FALSE;
}
}
// Win32 allows the pixel format to be set only once per app, so destroy and re-create the app:
DestroyWindow(hWnd);
hWnd = CreateWindowExA(0, szName, szName, dwStyle, windowLeft, windowTop, windowWidth, windowHeight, 0, 0, 0, 0);
SetWindowPos(hWnd, HWND_TOP, windowLeft, windowTop, windowWidth, windowHeight, 0);
hDC = GetDC(hWnd);
SetPixelFormat(hDC, pixelFormat, &pfd);
hRC = wglCreateContext(hDC);
wglMakeCurrent(hDC, hRC);
}
#define PEZ_TRANSPARENT_WINDOW 0
// For transparency, this doesn't seem to work. I think I'd need to read back from an OpenGL FBO and blit it with GDI.
if (PEZ_TRANSPARENT_WINDOW)
{
long flag = GetWindowLong(hWnd, GWL_EXSTYLE);
int opacity = 128;
flag |= WS_EX_LAYERED;
SetWindowLong(hWnd, GWL_EXSTYLE, flag);
SetLayeredWindowAttributes(hWnd, 0, opacity, LWA_ALPHA);
}
err = glewInit();
if (GLEW_OK != err)
{
PezFatalError("GLEW Error: %s\n", glewGetErrorString(err));
}
PezDebugString("OpenGL Version: %s\n", glGetString(GL_VERSION));
if (!PEZ_VERTICAL_SYNC)
{
wglSwapIntervalEXT(0);
}
if (PEZ_FORWARD_COMPATIBLE_GL)
{
const int contextAttribs[] =
{
WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
WGL_CONTEXT_MINOR_VERSION_ARB, 2,
WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
0
};
HGLRC newRC = wglCreateContextAttribsARB(hDC, 0, contextAttribs);
wglMakeCurrent(0, 0);
wglDeleteContext(hRC);
hRC = newRC;
wglMakeCurrent(hDC, hRC);
}
{
const char* szWindowTitle = PezInitialize(PEZ_VIEWPORT_WIDTH, PEZ_VIEWPORT_HEIGHT);
SetWindowTextA(hWnd, szWindowTitle);
}
QueryPerformanceFrequency(&freqTime);
QueryPerformanceCounter(&previousTime);
// -------------------
// Start the Game Loop
// -------------------
while (msg.message != WM_QUIT)
{
if (PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
else
{
LARGE_INTEGER currentTime;
__int64 elapsed;
double deltaTime;
QueryPerformanceCounter(¤tTime);
elapsed = currentTime.QuadPart - previousTime.QuadPart;
deltaTime = elapsed * 1000000.0 / freqTime.QuadPart;
previousTime = currentTime;
PezUpdate((unsigned int) deltaTime);
PezRender(0);
SwapBuffers(hDC);
PezCheckCondition(glGetError() == GL_NO_ERROR, "OpenGL error.\n");
}
}
UnregisterClassA(szName, wc.hInstance);
return 0;
}
Mesh CreateMesh(const char* ctmFile, float totalScale, float lengthScale)
{
Mesh mesh = {0};
char qualifiedPath[256] = {0};
strcpy(qualifiedPath, PezResourcePath());
strcat(qualifiedPath, "/\0");
strcat(qualifiedPath, ctmFile);
// Open the CTM file:
CTMcontext ctmContext = ctmNewContext(CTM_IMPORT);
ctmLoad(ctmContext, qualifiedPath);
PezCheckCondition(ctmGetError(ctmContext) == CTM_NONE, "OpenCTM issue with loading %s", qualifiedPath);
CTMuint vertexCount = ctmGetInteger(ctmContext, CTM_VERTEX_COUNT);
CTMuint faceCount = ctmGetInteger(ctmContext, CTM_TRIANGLE_COUNT);
// Create the VBO for positions:
const CTMfloat* positions = ctmGetFloatArray(ctmContext, CTM_VERTICES);
if (positions) {
// Find bounding box
float m = 99999.0f;
Point3 minCorner = P3MakeFromElems(m, m, m);
Point3 maxCorner = P3MakeFromElems(-m, -m, -m);
const CTMfloat* pSrc = positions;
CTMuint remainingVerts = vertexCount;
while (remainingVerts--)
{
float x = *pSrc++;
float y = *pSrc++;
float z = *pSrc++;
Point3 p = P3MakeFromElems(x, y, z);
minCorner = P3MinPerElem(p, minCorner);
maxCorner = P3MaxPerElem(p, maxCorner);
}
// Scale such that the Z extent is 'scale'
// The X and Y scales are computed according to the aspect ratio.
// The model is centered at (+0.5, +0.5, +0.5).
float xratio = (maxCorner.x - minCorner.x) / (maxCorner.z - minCorner.z);
float yratio = (maxCorner.y - minCorner.y) / (maxCorner.z - minCorner.z);
float sx = lengthScale * totalScale * xratio / (maxCorner.x - minCorner.x);
float sy = totalScale * yratio / (maxCorner.y - minCorner.y);
float sz = totalScale / (maxCorner.z - minCorner.z);
pSrc = positions;
remainingVerts = vertexCount;
CTMfloat* pDest = (CTMfloat*) positions;
while (remainingVerts--)
{
float x = *pSrc++;
float y = *pSrc++;
float z = *pSrc++;
*pDest++ = (x - minCorner.x) * sx - totalScale * xratio / 2;
*pDest++ = (y - minCorner.y) * sy - totalScale * yratio / 2;
*pDest++ = (z - minCorner.z) * sz - totalScale / 2;
}
GLuint handle;
GLsizeiptr size = vertexCount * sizeof(float) * 3;
glGenBuffers(1, &handle);
glBindBuffer(GL_ARRAY_BUFFER, handle);
glBufferData(GL_ARRAY_BUFFER, size, positions, GL_STATIC_DRAW);
mesh.Positions = handle;
}
// Create the VBO for normals:
const CTMfloat* normals = ctmGetFloatArray(ctmContext, CTM_NORMALS);
if (normals) {
GLuint handle;
GLsizeiptr size = vertexCount * sizeof(float) * 3;
glGenBuffers(1, &handle);
glBindBuffer(GL_ARRAY_BUFFER, handle);
glBufferData(GL_ARRAY_BUFFER, size, normals, GL_STATIC_DRAW);
mesh.Normals = handle;
}
// Create the VBO for indices:
const CTMuint* indices = ctmGetIntegerArray(ctmContext, CTM_INDICES);
if (indices) {
GLsizeiptr bufferSize = faceCount * 3 * sizeof(GLuint);
GLuint handle;
glGenBuffers(1, &handle);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, bufferSize, indices, GL_STATIC_DRAW);
mesh.Faces = handle;
}
ctmFreeContext(ctmContext);
mesh.FaceCount = faceCount;
mesh.VertexCount = vertexCount;
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
return mesh;
}
Mesh CreateMesh(const char* ctmFile)
{
Mesh mesh = {0, 0, 0, 0};
char qualifiedPath[256] = {0};
strcpy(qualifiedPath, PezResourcePath());
strcat(qualifiedPath, "/\0");
strcat(qualifiedPath, ctmFile);
// Open the CTM file:
CTMcontext ctmContext = ctmNewContext(CTM_IMPORT);
ctmLoad(ctmContext, qualifiedPath);
PezCheckCondition(ctmGetError(ctmContext) == CTM_NONE, "OpenCTM issue with loading %s", qualifiedPath);
CTMuint vertexCount = ctmGetInteger(ctmContext, CTM_VERTEX_COUNT);
CTMuint faceCount = ctmGetInteger(ctmContext, CTM_TRIANGLE_COUNT);
// Create the VBO for positions:
const CTMfloat* positions = ctmGetFloatArray(ctmContext, CTM_VERTICES);
if (positions) {
GLuint handle;
GLsizeiptr size = vertexCount * sizeof(float) * 3;
glGenBuffers(1, &handle);
glBindBuffer(GL_ARRAY_BUFFER, handle);
glBufferData(GL_ARRAY_BUFFER, size, positions, GL_STATIC_DRAW);
mesh.Positions = handle;
}
// Create the VBO for normals:
const CTMfloat* normals = ctmGetFloatArray(ctmContext, CTM_NORMALS);
if (normals) {
GLuint handle;
GLsizeiptr size = vertexCount * sizeof(float) * 3;
glGenBuffers(1, &handle);
glBindBuffer(GL_ARRAY_BUFFER, handle);
glBufferData(GL_ARRAY_BUFFER, size, normals, GL_STATIC_DRAW);
mesh.Normals = handle;
}
// Create the VBO for indices:
const CTMuint* indices = ctmGetIntegerArray(ctmContext, CTM_INDICES);
if (indices) {
GLsizeiptr bufferSize = faceCount * 3 * sizeof(unsigned short);
// Convert indices from 32-bit to 16-bit:
unsigned short* faceBuffer = (unsigned short*) malloc(bufferSize);
unsigned short* pDest = faceBuffer;
const CTMuint* pSrc = indices;
unsigned int remainingFaces = faceCount;
while (remainingFaces--)
{
*pDest++ = (unsigned short) *pSrc++;
*pDest++ = (unsigned short) *pSrc++;
*pDest++ = (unsigned short) *pSrc++;
}
GLuint handle;
glGenBuffers(1, &handle);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, bufferSize, faceBuffer, GL_STATIC_DRAW);
mesh.Faces = handle;
free(faceBuffer);
}
ctmFreeContext(ctmContext);
mesh.FaceCount = faceCount;
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
return mesh;
}
GLuint CreateProgram(const char* vsKey, const char* gsKey, const char* fsKey)
{
static int first = 1;
if (first) {
glswInit();
glswAddPath("../", ".glsl");
glswAddPath("./", ".glsl");
char qualifiedPath[128];
strcpy(qualifiedPath, PezResourcePath());
strcat(qualifiedPath, "/");
glswAddPath(qualifiedPath, ".glsl");
glswAddDirective("*", "#version 150");
first = 0;
}
const char* vsSource = glswGetShader(vsKey);
const char* gsSource = glswGetShader(gsKey);
const char* fsSource = glswGetShader(fsKey);
const char* msg = "Can't find %s shader: '%s'.\n";
PezCheckCondition(vsSource != 0, msg, "vertex", vsKey);
PezCheckCondition(gsKey == 0 || gsSource != 0, msg, "geometry", gsKey);
PezCheckCondition(fsKey == 0 || fsSource != 0, msg, "fragment", fsKey);
GLint compileSuccess;
GLchar compilerSpew[256];
GLuint programHandle = glCreateProgram();
GLuint vsHandle = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vsHandle, 1, &vsSource, 0);
glCompileShader(vsHandle);
glGetShaderiv(vsHandle, GL_COMPILE_STATUS, &compileSuccess);
glGetShaderInfoLog(vsHandle, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition(compileSuccess, "Can't compile %s:\n%s", vsKey, compilerSpew);
glAttachShader(programHandle, vsHandle);
GLuint gsHandle;
if (gsKey) {
gsHandle = glCreateShader(GL_GEOMETRY_SHADER);
glShaderSource(gsHandle, 1, &gsSource, 0);
glCompileShader(gsHandle);
glGetShaderiv(gsHandle, GL_COMPILE_STATUS, &compileSuccess);
glGetShaderInfoLog(gsHandle, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition(compileSuccess, "Can't compile %s:\n%s", gsKey, compilerSpew);
glAttachShader(programHandle, gsHandle);
}
GLuint fsHandle;
if (fsKey) {
fsHandle = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fsHandle, 1, &fsSource, 0);
glCompileShader(fsHandle);
glGetShaderiv(fsHandle, GL_COMPILE_STATUS, &compileSuccess);
glGetShaderInfoLog(fsHandle, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition(compileSuccess, "Can't compile %s:\n%s", fsKey, compilerSpew);
glAttachShader(programHandle, fsHandle);
}
glLinkProgram(programHandle);
GLint linkSuccess;
glGetProgramiv(programHandle, GL_LINK_STATUS, &linkSuccess);
glGetProgramInfoLog(programHandle, sizeof(compilerSpew), 0, compilerSpew);
if (!linkSuccess) {
PezDebugString("Link error.\n");
if (vsKey) PezDebugString("Vertex Shader: %s\n", vsKey);
if (gsKey) PezDebugString("Geometry Shader: %s\n", gsKey);
if (fsKey) PezDebugString("Fragment Shader: %s\n", fsKey);
PezDebugString("%s\n", compilerSpew);
}
return programHandle;
}
void setup() {
// 3. Define and compile vertex and fragment shaders
GLuint vs;
GLuint fs;
GLint compileSuccess, linkSuccess;
GLchar compilerSpew[256];
glswInit();
glswSetPath("../shader/", ".glsl");
glswAddDirectiveToken("GL3", "#version 150");
const char *vss = glswGetShader("test.Vertex.GL3");
const char *fss = glswGetShader("test.Fragment.GL3");
PezCheckCondition((void *)vss, "Can't find vertex shader.\n");
PezCheckCondition((void *)fss, "Can't find fragment shader.\n");
vs = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vs, 1, &vss, NULL);
glCompileShader(vs);
glGetShaderiv(vs, GL_COMPILE_STATUS, &compileSuccess);
glGetShaderInfoLog(vs, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition((void*)compileSuccess, compilerSpew);
fs = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fs, 1, &fss, NULL);
glCompileShader(fs);
glGetShaderiv(fs, GL_COMPILE_STATUS, &compileSuccess);
glGetShaderInfoLog(fs, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition((void*)compileSuccess, compilerSpew);
shaderProgram = glCreateProgram();
glAttachShader(shaderProgram, vs);
glAttachShader(shaderProgram, fs);
glBindFragDataLocation(shaderProgram, 0, "fragColour");
glLinkProgram(shaderProgram);
glGetProgramiv(shaderProgram, GL_LINK_STATUS, &linkSuccess);
glGetProgramInfoLog(shaderProgram, sizeof(compilerSpew), 0, compilerSpew);
PezCheckCondition((void*)linkSuccess, compilerSpew);
positionUniform = glGetUniformLocation(shaderProgram, "p");
colourAttribute = glGetAttribLocation(shaderProgram, "colour");
positionAttribute = glGetAttribLocation(shaderProgram, "position");
glDeleteShader(vs);
glDeleteShader(fs);
GLfloat vertexData[]= { -0.5,-0.5,0.0,1.0, 1.0,0.0,0.0,1.0,
-0.5, 0.5,0.0,1.0, 0.0,1.0,0.0,1.0,
0.5, 0.5,0.0,1.0, 0.0,0.0,1.0,1.0,
0.5,-0.5,0.0,1.0, 1.0,1.0,1.0,1.0};
glGenVertexArrays(1, &vertexArrayObject);
glBindVertexArray(vertexArrayObject);
glGenBuffers(1, &vertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, 4*8*sizeof(GLfloat), vertexData, GL_STATIC_DRAW);
glEnableVertexAttribArray((GLuint)positionAttribute);
glEnableVertexAttribArray((GLuint)colourAttribute );
glVertexAttribPointer((GLuint)positionAttribute, 4, GL_FLOAT, GL_FALSE, 8*sizeof(GLfloat), 0);
glVertexAttribPointer((GLuint)colourAttribute , 4, GL_FLOAT, GL_FALSE, 8*sizeof(GLfloat), (char*)0+4*sizeof(GLfloat));
}