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Add test with GLFW framework

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BUG=skia:

Review URL: https://codereview.chromium.org/1367403006
This commit is contained in:
jvanverth 2015-10-09 13:27:33 -07:00 committed by Commit bot
parent 939c0fe51f
commit cda8ec2b03
5 changed files with 632 additions and 0 deletions
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experimental/GLFWTest/.gitignore vendored Normal file
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project.xcworkspace/
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This test is Mac-only for now. Adding Linux or Win support shouldn’t be that difficult — it just needs a project file.
To run this demo, you’ll need to do three things:
1) Get GLFW 3.1.1 or later, and install it at third_party/externals/glfw. You’ll need to run ‘cmake’ in that directory to build the makefiles, and then ‘make’ to build the libglfw.a library.
2) Build the skia libraries via the command line (by running ‘ninja -C out/<config> dm’, for example.
3) Get a ship.png file. Place it in this directory.

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experimental/GLFWTest/glfw_main.cpp Normal file
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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GLFW/glfw3.h"
#include <stdlib.h>
#include <stdio.h>
#include "GrContext.h"
#include "SkCanvas.h"
#include "SkImage.h"
#include "SkRSXform.h"
#include "SkSurface.h"
#include "Timer.h"
GrContext* sContext = nullptr;
SkSurface* sSurface = nullptr;
static void error_callback(int error, const char* description) {
fputs(description, stderr);
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
}
static void init_skia(int w, int h) {
sContext = GrContext::Create(kOpenGL_GrBackend, 0);
GrBackendRenderTargetDesc desc;
desc.fWidth = w;
desc.fHeight = h;
desc.fConfig = kSkia8888_GrPixelConfig;
desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
desc.fSampleCnt = 1;
desc.fStencilBits = 0;
desc.fRenderTargetHandle = 0; // assume default framebuffer
sSurface = SkSurface::NewFromBackendRenderTarget(sContext, desc, NULL);
}
static void cleanup_skia() {
delete sSurface;
delete sContext;
}
const int kGrid = 100;
const int kWidth = 960;
const int kHeight = 640;
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);
}