int main(void) { GLFWwindow* window; glfwSetErrorCallback(error_callback); if (!glfwInit()) { exit(EXIT_FAILURE); } glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2); glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); glfwWindowHint(GLFW_SRGB_CAPABLE, GL_TRUE); window = glfwCreateWindow(kWidth, kHeight, "Simple example", NULL, NULL); if (!window) { glfwTerminate(); exit(EXIT_FAILURE); } glfwMakeContextCurrent(window); init_skia(kWidth, kHeight); SkAutoTUnref<SkImage> atlas; SkRSXform xform[kGrid*kGrid+1]; SkRect tex[kGrid*kGrid+1]; WallTimer timer; float times[32]; int currentTime; SkAutoTUnref<SkData> imageData(SkData::NewFromFileName("ship.png")); atlas.reset(SkImage::NewFromEncoded(imageData)); if (!atlas) { SkDebugf("\nCould not decode file ship.png\n"); cleanup_skia(); glfwDestroyWindow(window); glfwTerminate(); exit(EXIT_FAILURE); } SkScalar anchorX = atlas->width()*0.5f; SkScalar anchorY = atlas->height()*0.5f; int currIndex = 0; for (int x = 0; x < kGrid; x++) { for (int y = 0; y < kGrid; y++) { float xPos = (x / (kGrid - 1.0)) * kWidth; float yPos = (y / (kGrid - 1.0)) * kWidth; tex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f, atlas->width(), atlas->height()); xform[currIndex] = SkRSXform::MakeFromRadians(2.0f, SK_ScalarPI*0.5f, xPos, yPos, anchorX, anchorY); currIndex++; } } tex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f, atlas->width(), atlas->height()); xform[currIndex] = SkRSXform::MakeFromRadians(2.0f, SK_ScalarPI*0.5f, kWidth*0.5f, kHeight*0.5f, anchorX, anchorY); currentTime = 0; glfwSwapInterval(1); glfwSetKeyCallback(window, key_callback); // Draw to the surface via its SkCanvas. SkCanvas* canvas = sSurface->getCanvas(); // We don't manage this pointer's lifetime. SkPaint paint; paint.setFilterQuality(kLow_SkFilterQuality); paint.setColor(SK_ColorWHITE); paint.setTextSize(15.0f); while (!glfwWindowShouldClose(window)) { const float kCosDiff = 0.99984769515f; const float kSinDiff = 0.01745240643f; timer.start(); glfwPollEvents(); float meanTime = 0.0f; for (int i = 0; i < 32; ++i) { meanTime += times[i]; } meanTime /= 32.f; char outString[64]; float fps = 1000.f/meanTime; sprintf(outString, "fps: %f ms: %f", fps, meanTime); for (int i = 0; i < kGrid*kGrid+1; ++i) { SkScalar c = xform[i].fSCos; SkScalar s = xform[i].fSSin; SkScalar dx = c*anchorX - s*anchorY; SkScalar dy = s*anchorX + c*anchorY; xform[i].fSCos = kCosDiff*c - kSinDiff*s; xform[i].fSSin = kSinDiff*c + kCosDiff*s; dx -= xform[i].fSCos*anchorX - xform[i].fSSin*anchorY; dy -= xform[i].fSSin*anchorX + xform[i].fSCos*anchorY; xform[i].fTx += dx; xform[i].fTy += dy; } canvas->clear(SK_ColorBLACK); canvas->drawAtlas(atlas, xform, tex, nullptr, kGrid*kGrid+1, SkXfermode::kSrcOver_Mode, nullptr, &paint); canvas->drawText(outString, strlen(outString), 100.f, 100.f, paint); canvas->flush(); timer.end(); times[currentTime] = (float)(timer.fWall); currentTime = (currentTime + 1) & 0x1f; glfwSwapBuffers(window); } cleanup_skia(); glfwDestroyWindow(window); glfwTerminate(); exit(EXIT_SUCCESS); }