Javascript WebGL:尽管使用相同的代码,但一切都很模糊
从WebGL开始,试着画一些基本的线,甚至不是多边形。我找到了一些例子,在本地复制粘贴,然后在Firefox中运行,它们看起来很好:清晰的边缘。然后,我创建自己的项目,重构(糟糕的!)样本代码,使用RequireJS加载,等等,样本仍然有效,但现在我的边/点/线都模糊了。就像一些糟糕的抗锯齿设置把一切都搞糟了一样。我尝试了一切,起初我的代码看起来有些不同(虽然功能相同,IMHO),然后我进行了更多重构,使其看起来与示例几乎相同,但我仍然看到模糊的线条 我做错了什么 示例代码: 示例代码的实时工作版本: 我的版本: 我的重构代码: main.js(通过index.html中的数据主属性加载):Javascript WebGL:尽管使用相同的代码,但一切都很模糊,javascript,webgl,Javascript,Webgl,从WebGL开始,试着画一些基本的线,甚至不是多边形。我找到了一些例子,在本地复制粘贴,然后在Firefox中运行,它们看起来很好:清晰的边缘。然后,我创建自己的项目,重构(糟糕的!)样本代码,使用RequireJS加载,等等,样本仍然有效,但现在我的边/点/线都模糊了。就像一些糟糕的抗锯齿设置把一切都搞糟了一样。我尝试了一切,起初我的代码看起来有些不同(虽然功能相同,IMHO),然后我进行了更多重构,使其看起来与示例几乎相同,但我仍然看到模糊的线条 我做错了什么 示例代码: 示例代码的实时工作
定义(
[
“libs/domReady”,
“网络游戏”,
“libs/text../shaders/fragmentShader.glsl”,
“libs/text.../shaders/vertexShader.glsl”
],
函数(domReady、GLEngine、fragmentShaderCode、vertexShaderCode)
{
domReady(函数()
{
GLEngine.init(“graphCanvas”);
初始化着色器(fragmentShaderCode、vertexShaderCode);
变量几何体=(函数()
{
var-res=[];
var a=document.getElementById(“graphCanvas”).width/4.0;
var b=document.getElementById(“graphCanvas”).height/2.0;
对于(变量x=0;x<4.0;x+=0.005)
{
变量y=Math.exp(-x)*Math.cos(2*Math.PI*x);
推力(x*a,(y+1)*b,0);
}
返回res;
})();
创建缓冲区(几何);
GLEngine.render();
});
});
WebGlEngine.js:
define(
[
],
function()
{
"use strict";
// Singleton Pattern through RequireJS
var gl = null;
var shaderProgram = null;
var pMatrix = mat4.create();
var initGl = function(canvasId)
{
try
{
var canvas = document.getElementById(canvasId);
//gl = canvas.getContext("experimental-webgl", { antialias: true });
gl = (function()
{
var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
var context = null;
for (var ii = 0; ii < names.length; ++ii)
{
try
{
context = canvas.getContext(names[ii]);
}
catch (e) { }
if (context)
{
break;
}
}
return context;
})();
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
mat4.ortho(0, gl.viewportWidth, 0, gl.viewportHeight, -1, 1, pMatrix);
}
catch (e)
{
}
if (!gl)
{
throw("Could not initialise WebGL");
}
}
var createShader = function(shaderCode, shaderType)
{
if(shaderType !== "FRAGMENT_SHADER" && shaderType !== "VERTEX_SHADER")
throw("Invalid shader type");
var shader = gl.createShader(gl[shaderType]);
gl.shaderSource(shader, shaderCode);
gl.compileShader(shader);
if(!gl.getShaderParameter(shader, gl.COMPILE_STATUS))
throw("Bad shader: " + gl.getShaderInfoLog(shader));
return shader;
};
var initShaders = function(fragmentShaderCode, vertexShaderCode)
{
shaderProgram = gl.createProgram();
var fragmentShader = createShader(fragmentShaderCode, "FRAGMENT_SHADER");
var vertexShader = createShader(vertexShaderCode, "VERTEX_SHADER");
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS))
throw("Could not initialise shaders");
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionLoc = gl.getAttribLocation(shaderProgram, "aVertexPosition");
gl.enableVertexAttribArray(shaderProgram.vertexPositionLoc);
shaderProgram.pMatrixLoc = gl.getUniformLocation(shaderProgram, "uPMatrix");
};
var geometry = [];
var vertexBuffer = null;
var createBuffers = function(vertices)
{
geometry = vertices;
vertexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(geometry), gl.STATIC_DRAW);
};
var render = function()
{
gl.clear(gl.COLOR_BUFFER_BIT);
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionLoc, 3, gl.FLOAT, false, 0, 0);
gl.uniformMatrix4fv(shaderProgram.pMatrixLoc, 0, pMatrix);
gl.drawArrays(gl.POINTS, 0, geometry.length / 3);
};
return {
init: initGl,
initShaders: initShaders,
createBuffers: createBuffers,
render: render,
GL: function()
{
return gl;
}
};
});
定义(
[
],
函数()
{
“严格使用”;
//通过RequireJS的单例模式
var-gl=null;
var shaderProgram=null;
var pMatrix=mat4.create();
var initGl=函数(canvasId)
{
尝试
{
var canvas=document.getElementById(canvasId);
//gl=canvas.getContext(“实验性webgl”,{antialas:true});
gl=(函数()
{
变量名称=[“webgl”、“实验webgl”、“webkit-3d”、“moz webgl”];
var-context=null;
对于(变量ii=0;ii
问题不在于您发布的Javascript代码,而在于Canvas
元素
与通常的html
元素相反,Canvas
元素需要它的width
和height
属性,并将其用作逻辑大小
您设置的CSS
宽度和高度只会拉伸结果,这就是您看到模糊的原因
关于这个问题,可以找到更详细的解释:Wow。这让我快发疯了——谢谢你的解决方案!我想应该读一下画布规格。精彩的评论,这个问题让我发疯。
define(
[
],
function()
{
"use strict";
// Singleton Pattern through RequireJS
var gl = null;
var shaderProgram = null;
var pMatrix = mat4.create();
var initGl = function(canvasId)
{
try
{
var canvas = document.getElementById(canvasId);
//gl = canvas.getContext("experimental-webgl", { antialias: true });
gl = (function()
{
var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
var context = null;
for (var ii = 0; ii < names.length; ++ii)
{
try
{
context = canvas.getContext(names[ii]);
}
catch (e) { }
if (context)
{
break;
}
}
return context;
})();
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
mat4.ortho(0, gl.viewportWidth, 0, gl.viewportHeight, -1, 1, pMatrix);
}
catch (e)
{
}
if (!gl)
{
throw("Could not initialise WebGL");
}
}
var createShader = function(shaderCode, shaderType)
{
if(shaderType !== "FRAGMENT_SHADER" && shaderType !== "VERTEX_SHADER")
throw("Invalid shader type");
var shader = gl.createShader(gl[shaderType]);
gl.shaderSource(shader, shaderCode);
gl.compileShader(shader);
if(!gl.getShaderParameter(shader, gl.COMPILE_STATUS))
throw("Bad shader: " + gl.getShaderInfoLog(shader));
return shader;
};
var initShaders = function(fragmentShaderCode, vertexShaderCode)
{
shaderProgram = gl.createProgram();
var fragmentShader = createShader(fragmentShaderCode, "FRAGMENT_SHADER");
var vertexShader = createShader(vertexShaderCode, "VERTEX_SHADER");
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS))
throw("Could not initialise shaders");
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionLoc = gl.getAttribLocation(shaderProgram, "aVertexPosition");
gl.enableVertexAttribArray(shaderProgram.vertexPositionLoc);
shaderProgram.pMatrixLoc = gl.getUniformLocation(shaderProgram, "uPMatrix");
};
var geometry = [];
var vertexBuffer = null;
var createBuffers = function(vertices)
{
geometry = vertices;
vertexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(geometry), gl.STATIC_DRAW);
};
var render = function()
{
gl.clear(gl.COLOR_BUFFER_BIT);
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionLoc, 3, gl.FLOAT, false, 0, 0);
gl.uniformMatrix4fv(shaderProgram.pMatrixLoc, 0, pMatrix);
gl.drawArrays(gl.POINTS, 0, geometry.length / 3);
};
return {
init: initGl,
initShaders: initShaders,
createBuffers: createBuffers,
render: render,
GL: function()
{
return gl;
}
};
});