Created
November 12, 2011 16:53
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PhiloGL Lesson 6 using canvas as image source
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function webGLStart() { | |
var c = document.createElement( 'canvas' ), | |
ctx = c.getContext( '2d' ), | |
img = new Image(); | |
c.width = 256; c.height = 256; | |
ctx.save(); | |
ctx.strokeStyle = 'Red'; | |
ctx.font = 'normal 24px helvetica, arial'; | |
ctx.textAlign = 'center'; | |
ctx.textBaseline = 'middle'; | |
//ctx.fillStyle = 'rgba(0,0,0,255)'; | |
//ctx.fillRect( 0, 0, 300, 300 ); | |
ctx.lineWidth = 2; | |
ctx.strokeText( "Hello", 128, 108 ); | |
var xRot = 0, xSpeed = 0, | |
yRot = 0, ySpeed = 0, | |
z = -5.0, | |
filter = 0, | |
filters = ['nearest', 'linear', 'mipmap']; | |
//Create object | |
var cube = new PhiloGL.O3D.Model({ | |
vertices: [-1, -1, 1, | |
1, -1, 1, | |
1, 1, 1, | |
-1, 1, 1, | |
-1, -1, -1, | |
-1, 1, -1, | |
1, 1, -1, | |
1, -1, -1, | |
-1, 1, -1, | |
-1, 1, 1, | |
1, 1, 1, | |
1, 1, -1, | |
-1, -1, -1, | |
1, -1, -1, | |
1, -1, 1, | |
-1, -1, 1, | |
1, -1, -1, | |
1, 1, -1, | |
1, 1, 1, | |
1, -1, 1, | |
-1, -1, -1, | |
-1, -1, 1, | |
-1, 1, 1, | |
-1, 1, -1], | |
texCoords: [ | |
// Front face | |
0.0, 0.0, | |
1.0, 0.0, | |
1.0, 1.0, | |
0.0, 1.0, | |
// Back face | |
1.0, 0.0, | |
1.0, 1.0, | |
0.0, 1.0, | |
0.0, 0.0, | |
// Top face | |
0.0, 1.0, | |
0.0, 0.0, | |
1.0, 0.0, | |
1.0, 1.0, | |
// Bottom face | |
1.0, 1.0, | |
0.0, 1.0, | |
0.0, 0.0, | |
1.0, 0.0, | |
// Right face | |
1.0, 0.0, | |
1.0, 1.0, | |
0.0, 1.0, | |
0.0, 0.0, | |
// Left face | |
0.0, 0.0, | |
1.0, 0.0, | |
1.0, 1.0, | |
0.0, 1.0 | |
], | |
indices: [0, 1, 2, 0, 2, 3, | |
4, 5, 6, 4, 6, 7, | |
8, 9, 10, 8, 10, 11, | |
12, 13, 14, 12, 14, 15, | |
16, 17, 18, 16, 18, 19, | |
20, 21, 22, 20, 22, 23] | |
}); | |
PhiloGL('lesson06-canvas', { | |
program: { | |
from: 'ids', | |
vs: 'shader-vs', | |
fs: 'shader-fs' | |
}, | |
events: { | |
onKeyDown: function(e) { | |
switch(e.key) { | |
case 'f': | |
filter = (filter + 1) % 3; | |
break; | |
case 'up': | |
xSpeed -= 0.02; | |
break; | |
case 'down': | |
xSpeed += 0.02; | |
break; | |
case 'left': | |
ySpeed -= 0.02; | |
break; | |
case 'right': | |
ySpeed += 0.02; | |
break; | |
//handle page up/down | |
default: | |
if (e.code == 33) { | |
z -= 0.05; | |
} else if (e.code == 34) { | |
z += 0.05; | |
} | |
} | |
} | |
}, | |
onError: function() { | |
alert("An error ocurred while loading the application"); | |
}, | |
onLoad: function(app) { | |
var gl = app.gl, | |
canvas = app.canvas, | |
program = app.program, | |
camera = app.camera, | |
view = new PhiloGL.Mat4, | |
rCube = 0; | |
gl.viewport(0, 0, canvas.width, canvas.height); | |
gl.clearColor(0, 0, 0, 1); | |
gl.clearDepth(1); | |
gl.enable(gl.DEPTH_TEST); | |
gl.depthFunc(gl.LEQUAL); | |
camera.view.id(); | |
//set buffers with cube data | |
program.setBuffers({ | |
'aVertexPosition': { | |
value: cube.vertices, | |
size: 3 | |
}, | |
'aTextureCoord': { | |
value: cube.texCoords, | |
size: 2 | |
}, | |
'indices': { | |
value: cube.indices, | |
bufferType: gl.ELEMENT_ARRAY_BUFFER, | |
size: 1 | |
} | |
}); | |
//load textures from image | |
//var img = new Image(); | |
img.onload = function() { | |
program.setTextures({ | |
'nearest': { | |
data: { | |
value: img | |
} | |
}, | |
'linear': { | |
data: { | |
value: img | |
}, | |
parameters: [{ | |
name: gl.TEXTURE_MAG_FILTER, | |
value: gl.LINEAR | |
}, { | |
name: gl.TEXTURE_MIN_FILTER, | |
value: gl.LINEAR | |
}] | |
}, | |
'mipmap': { | |
data: { | |
value: img | |
}, | |
parameters: [{ | |
name: gl.TEXTURE_MAG_FILTER, | |
value: gl.LINEAR | |
}, { | |
name: gl.TEXTURE_MIN_FILTER, | |
value: gl.LINEAR_MIPMAP_NEAREST, | |
generateMipmap: true | |
}] | |
} | |
}); | |
function animate() { | |
xRot += xSpeed; | |
yRot += ySpeed; | |
} | |
function tick() { | |
drawScene(); | |
animate(); | |
PhiloGL.Fx.requestAnimationFrame(tick); | |
} | |
function drawScene() { | |
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); | |
//draw Cube | |
cube.position.set(0, 0, z); | |
cube.rotation.set(xRot, yRot, 0); | |
//update element matrix | |
cube.update(); | |
//get new view matrix out of element and camera matrices | |
view.mulMat42(camera.view, cube.matrix); | |
//set attributes, indices and textures | |
program.setBuffer('aVertexPosition') | |
.setBuffer('aTextureCoord') | |
.setBuffer('indices') | |
.setTexture(filters[filter]); | |
//set uniforms | |
program.setUniform('uMVMatrix', view) | |
.setUniform('uPMatrix', camera.projection) | |
.setUniform('uSampler', 0); | |
//draw triangles | |
gl.drawElements(gl.TRIANGLES, cube.indices.length, gl.UNSIGNED_SHORT, 0); | |
} | |
tick(); | |
}; | |
//load image | |
window.ctx = ctx; | |
img.src = c.toDataURL(); | |
} | |
}); | |
} | |
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