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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Fang Idle Sprite Animation. WebGL 2.0, JavaScript</title>
<script src="https://cdn.jsdelivr.net/npm/gl-matrix@3.4.3/gl-matrix-min.js"></script>
</head>
<body>
<canvas id="renderCanvas" width="300" height="300"></canvas>
<script>
const canvas = document.getElementById("renderCanvas");
const gl = canvas.getContext("webgl2");
const vertShaderSrc =
`#version 300 es
in vec2 aPosition;
in vec2 aTexCoord;
uniform mat4 uMvpMatrix;
out vec2 vTexCoord;
void main()
{
gl_Position = uMvpMatrix * vec4(aPosition, 0.0, 1.0);
vTexCoord = aTexCoord;
}`;
const fragShaderSrc =
`#version 300 es
precision mediump float;
uniform sampler2D uSampler;
in vec2 vTexCoord;
out vec4 fragColor;
void main()
{
fragColor = texture(uSampler, vTexCoord);
}`;
const vShader = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(vShader, vertShaderSrc);
gl.compileShader(vShader);
let ok = gl.getShaderParameter(vShader, gl.COMPILE_STATUS);
if (!ok) { console.log(gl.getShaderInfoLog(vShader));; }
const fShader = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(fShader, fragShaderSrc);
gl.compileShader(fShader);
ok = gl.getShaderParameter(fShader, gl.COMPILE_STATUS);
if (!ok) { console.log(gl.getShaderInfoLog(fShader));; }
const program = gl.createProgram();
gl.attachShader(program, vShader);
gl.attachShader(program, fShader);
gl.linkProgram(program);
ok = gl.getProgramParameter(program, gl.LINK_STATUS);
if (!ok) { console.log(gl.getProgramInfoLog(program)); }
gl.useProgram(program);
const aPositionLocation = gl.getAttribLocation(program, "aPosition");
const aTexCoordLocation = gl.getAttribLocation(program, "aTexCoord");
const vertPositions = [
-0.5, -0.5, // frame 00
0.5, -0.5,
-0.5, 0.5,
0.5, 0.5,
-0.5, -0.5, // frame 01
0.5, -0.5,
-0.5, 0.5,
0.5, 0.5,
-0.5, -0.5, // frame 02
0.5, -0.5,
-0.5, 0.5,
0.5, 0.5,
-0.5, -0.5, // frame 03
0.5, -0.5,
-0.5, 0.5,
0.5, 0.5
];
const vertPosVBO = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertPosVBO);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertPositions), gl.STATIC_DRAW);
gl.vertexAttribPointer(aPositionLocation, 2, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(aPositionLocation);
const texCoords = [
0, 1, // frame 00
1 / 4, 1,
0, 0,
1 / 4, 0,
1 / 4, 1, // frame 01
2 / 4, 1,
1 / 4, 0,
2 / 4, 0,
2 / 4, 1, // frame 02
3 / 4, 1,
2 / 4, 0,
3 / 4, 0,
3 / 4, 1, // frame 03
1, 1,
3 / 4, 0,
1, 0
];
const texCoordVBO = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, texCoordVBO);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(texCoords), gl.STATIC_DRAW);
gl.vertexAttribPointer(aTexCoordLocation, 2, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(aTexCoordLocation);
const projMatrix = glMatrix.mat4.create();
glMatrix.mat4.ortho(projMatrix, 0, 100, 0, 100, 100, -100);
const viewMatrix = glMatrix.mat4.create();
glMatrix.mat4.lookAt(viewMatrix, [0, 0, 90], [0, 0, 0], [0, 1, 0]);
const projViewMatrix = glMatrix.mat4.create();
const mvpMatrix = glMatrix.mat4.create();
const modelMatrix = glMatrix.mat4.create();
glMatrix.mat4.mul(projViewMatrix, projMatrix, viewMatrix);
const uMvpMatrixLocation = gl.getUniformLocation(program, "uMvpMatrix");
const uSamplerLocation = gl.getUniformLocation(program, "uSampler");
gl.uniform1i(uSamplerLocation, 0);
gl.enable(gl.BLEND);
gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
gl.clearColor(0.93, 0.95, 0.98, 1);
let currentTime, lastTime, deltaTime;
let animationTime = 0;
const timePeriod = 250;
let drawingIndex = 0;
const image = new Image();
image.onload =
() =>
{
gl.activeTexture(gl.TEXTURE0);
const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
glMatrix.mat4.identity(modelMatrix);
glMatrix.mat4.translate(modelMatrix, modelMatrix, [50, 50, 0]);
// glMatrix.mat4.rotateZ(modelMatrix, modelMatrix, 30 * Math. PI / 180);
glMatrix.mat4.scale(modelMatrix, modelMatrix, [40, 50, 1]);
glMatrix.mat4.mul(mvpMatrix, projViewMatrix, modelMatrix);
gl.uniformMatrix4fv(uMvpMatrixLocation, false, mvpMatrix);
lastTime = Date.now();
animationLoop();
};
image.src = "assets/fang-idle.png";
function animationLoop()
{
requestAnimationFrame(() => animationLoop());
currentTime = Date.now();
deltaTime = currentTime - lastTime;
lastTime = currentTime;
animationTime += deltaTime;
if (animationTime >= timePeriod)
{
animationTime = 0;
gl.clear(gl.COLOR_BUFFER_BIT);
gl.drawArrays(gl.TRIANGLE_STRIP, drawingIndex, 4);
drawingIndex += 4;
if (drawingIndex >= 16) { drawingIndex = 0; }
}
}
</script>
</body>
</html> |
Категории блога
