1/* 2 * Copyright 2015 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8#include <stdlib.h> 9#include <stdio.h> 10#include "GLFW/glfw3.h" 11#include "GrBackendSurface.h" 12#include "GrContext.h" 13#include "SkCanvas.h" 14#include "SkImage.h" 15#include "SkRSXform.h" 16#include "SkSurface.h" 17#include "Timer.h" 18 19GrContext* sContext = nullptr; 20SkSurface* sSurface = nullptr; 21 22static void error_callback(int error, const char* description) { 23 fputs(description, stderr); 24} 25 26static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) { 27 if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) 28 glfwSetWindowShouldClose(window, GL_TRUE); 29} 30 31 32static void init_skia(int w, int h) { 33 sContext = GrContext::MakeGL(nullptr).release(); 34 35 GrGLFramebufferInfo framebufferInfo; 36 framebufferInfo.fFBOID = 0; // assume default framebuffer 37 // We are always using OpenGL and we use RGBA8 internal format for both RGBA and BGRA configs in 38 // OpenGL. 39 framebufferInfo.fFormat = GR_GL_RGBA8; 40 SkColorType colorType; 41 if (kRGBA_8888_GrPixelConfig == kSkia8888_GrPixelConfig) { 42 colorType = kRGBA_8888_SkColorType; 43 } else { 44 colorType = kBGRA_8888_SkColorType; 45 } 46 GrBackendRenderTarget backendRenderTarget(w, h, 47 0, // sample count 48 0, // stencil bits 49 framebufferInfo); 50 51 sSurface = SkSurface::MakeFromBackendRenderTarget(sContext, backendRenderTarget, 52 kBottomLeft_GrSurfaceOrigin, colortype, 53 nullptr, nullptr).release(); 54} 55 56static void cleanup_skia() { 57 delete sSurface; 58 delete sContext; 59} 60 61const int kGrid = 100; 62const int kWidth = 960; 63const int kHeight = 640; 64 65int main(void) { 66 GLFWwindow* window; 67 glfwSetErrorCallback(error_callback); 68 if (!glfwInit()) { 69 exit(EXIT_FAILURE); 70 } 71 72 glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); 73 glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2); 74 glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); 75 glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); 76 glfwWindowHint(GLFW_SRGB_CAPABLE, GL_TRUE); 77 78 window = glfwCreateWindow(kWidth, kHeight, "Simple example", NULL, NULL); 79 if (!window) { 80 glfwTerminate(); 81 exit(EXIT_FAILURE); 82 } 83 glfwMakeContextCurrent(window); 84 85 init_skia(kWidth, kHeight); 86 87 sk_sp<SkImage> atlas; 88 SkRSXform xform[kGrid*kGrid+1]; 89 SkRect tex[kGrid*kGrid+1]; 90 WallTimer timer; 91 float times[32]; 92 int currentTime; 93 94 sk_sp<SkData> imageData(SkData::MakeFromFileName("images/ship.png")); 95 atlas.reset(SkImage::NewFromEncoded(imageData.get())); 96 if (!atlas) { 97 SkDebugf("\nCould not decode file ship.png\n"); 98 99 cleanup_skia(); 100 glfwDestroyWindow(window); 101 glfwTerminate(); 102 exit(EXIT_FAILURE); 103 } 104 105 SkScalar anchorX = atlas->width()*0.5f; 106 SkScalar anchorY = atlas->height()*0.5f; 107 int currIndex = 0; 108 for (int x = 0; x < kGrid; x++) { 109 for (int y = 0; y < kGrid; y++) { 110 float xPos = (x / (kGrid - 1.0)) * kWidth; 111 float yPos = (y / (kGrid - 1.0)) * kWidth; 112 113 tex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f, atlas->width(), atlas->height()); 114 xform[currIndex] = SkRSXform::MakeFromRadians(2.0f, SK_ScalarPI*0.5f, 115 xPos, yPos, anchorX, anchorY); 116 currIndex++; 117 } 118 } 119 tex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f, atlas->width(), atlas->height()); 120 xform[currIndex] = SkRSXform::MakeFromRadians(2.0f, SK_ScalarPI*0.5f, 121 kWidth*0.5f, kHeight*0.5f, anchorX, anchorY); 122 123 currentTime = 0; 124 125 glfwSwapInterval(1); 126 glfwSetKeyCallback(window, key_callback); 127 128 // Draw to the surface via its SkCanvas. 129 SkCanvas* canvas = sSurface->getCanvas(); // We don't manage this pointer's lifetime. 130 SkPaint paint; 131 paint.setFilterQuality(kLow_SkFilterQuality); 132 paint.setColor(SK_ColorWHITE); 133 paint.setTextSize(15.0f); 134 135 while (!glfwWindowShouldClose(window)) { 136 const float kCosDiff = 0.99984769515f; 137 const float kSinDiff = 0.01745240643f; 138 139 timer.start(); 140 141 glfwPollEvents(); 142 143 float meanTime = 0.0f; 144 for (int i = 0; i < 32; ++i) { 145 meanTime += times[i]; 146 } 147 meanTime /= 32.f; 148 char outString[64]; 149 float fps = 1000.f/meanTime; 150 sprintf(outString, "fps: %f ms: %f", fps, meanTime); 151 152 for (int i = 0; i < kGrid*kGrid+1; ++i) { 153 SkScalar c = xform[i].fSCos; 154 SkScalar s = xform[i].fSSin; 155 156 SkScalar dx = c*anchorX - s*anchorY; 157 SkScalar dy = s*anchorX + c*anchorY; 158 159 xform[i].fSCos = kCosDiff*c - kSinDiff*s; 160 xform[i].fSSin = kSinDiff*c + kCosDiff*s; 161 162 dx -= xform[i].fSCos*anchorX - xform[i].fSSin*anchorY; 163 dy -= xform[i].fSSin*anchorX + xform[i].fSCos*anchorY; 164 xform[i].fTx += dx; 165 xform[i].fTy += dy; 166 } 167 168 canvas->clear(SK_ColorBLACK); 169 canvas->drawAtlas(atlas, xform, tex, nullptr, kGrid*kGrid+1, SkXfermode::kSrcOver_Mode, 170 nullptr, &paint); 171 canvas->drawText(outString, strlen(outString), 100.f, 100.f, paint); 172 173 canvas->flush(); 174 175 timer.end(); 176 times[currentTime] = (float)(timer.fWall); 177 currentTime = (currentTime + 1) & 0x1f; 178 179 glfwSwapBuffers(window); 180 } 181 182 cleanup_skia(); 183 184 glfwDestroyWindow(window); 185 glfwTerminate(); 186 exit(EXIT_SUCCESS); 187} 188