| kbr@google.com | ae73e94 | 2010-06-28 17:41:40 +0000 | [diff] [blame] | 1 | <html> |
| 2 | <head> |
| ap@apple.com | fab549e | 2014-12-27 23:22:02 +0000 | [diff] [blame] | 3 | <script src="../../../resources/js-test.js"></script> |
| kbr@google.com | ae73e94 | 2010-06-28 17:41:40 +0000 | [diff] [blame] | 4 | <script src="resources/webgl-test.js"></script> |
| kbr@google.com | ae73e94 | 2010-06-28 17:41:40 +0000 | [diff] [blame] | 5 | </head> |
| 6 | <body> |
| 7 | <canvas id="example" width="1px" height="1px"></canvas> |
| 8 | <div id="description"></div> |
| 9 | <div id="console"></div> |
| 10 | |
| 11 | <script id="vs" type="x-shader/x-vertex"> |
| 12 | attribute vec4 vPosition; |
| 13 | attribute vec4 vColor; |
| 14 | varying vec4 color; |
| 15 | void main() { |
| 16 | gl_Position = vPosition; |
| 17 | color = vColor; |
| 18 | } |
| 19 | </script> |
| 20 | <script id="fs" type="x-shader/x-fragment"> |
| 21 | #if defined(GL_ES) |
| 22 | precision mediump float; |
| 23 | #endif |
| 24 | varying vec4 color; |
| 25 | void main() { |
| 26 | gl_FragColor = color; |
| 27 | } |
| 28 | </script> |
| 29 | <script> |
| 30 | description('Test that updating the size of a vertex buffer is properly noticed by the WebGL implementation.') |
| 31 | |
| kbr@google.com | ae73e94 | 2010-06-28 17:41:40 +0000 | [diff] [blame] | 32 | var gl = initWebGL("example", "vs", "fs", ["vPosition", "vColor"], [0, 0, 0, 1], 1); |
| 33 | glErrorShouldBe(gl, gl.NO_ERROR, "after initialization"); |
| 34 | |
| 35 | gl.useProgram(gl.program); |
| 36 | var vertexObject = gl.createBuffer(); |
| 37 | gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject); |
| 38 | gl.bufferData(gl.ARRAY_BUFFER, new Float32Array( |
| 39 | [-1,1,0, 1,1,0, -1,-1,0, |
| 40 | -1,-1,0, 1,1,0, 1,-1,0]), gl.STATIC_DRAW); |
| 41 | gl.enableVertexAttribArray(0); |
| 42 | gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0); |
| 43 | glErrorShouldBe(gl, gl.NO_ERROR, "after vertex setup"); |
| 44 | |
| 45 | var texCoordObject = gl.createBuffer(); |
| 46 | gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject); |
| 47 | gl.bufferData(gl.ARRAY_BUFFER, new Float32Array( |
| 48 | [0,0, 1,0, 0,1, |
| 49 | 0,1, 1,0, 1,1]), gl.STATIC_DRAW); |
| 50 | gl.enableVertexAttribArray(1); |
| 51 | gl.vertexAttribPointer(1, 2, gl.FLOAT, false, 0, 0); |
| 52 | glErrorShouldBe(gl, gl.NO_ERROR, "after texture coord setup"); |
| 53 | |
| 54 | // Now resize these buffers because we want to change what we're drawing. |
| 55 | gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject); |
| 56 | gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ |
| 57 | -1,1,0, 1,1,0, -1,-1,0, 1,-1,0, |
| 58 | -1,1,0, 1,1,0, -1,-1,0, 1,-1,0]), gl.STATIC_DRAW); |
| 59 | glErrorShouldBe(gl, gl.NO_ERROR, "after vertex redefinition"); |
| 60 | gl.bindBuffer(gl.ARRAY_BUFFER, texCoordObject); |
| 61 | gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array([ |
| 62 | 255, 0, 0, 255, |
| 63 | 255, 0, 0, 255, |
| 64 | 255, 0, 0, 255, |
| 65 | 255, 0, 0, 255, |
| 66 | 0, 255, 0, 255, |
| 67 | 0, 255, 0, 255, |
| 68 | 0, 255, 0, 255, |
| 69 | 0, 255, 0, 255]), gl.STATIC_DRAW); |
| 70 | gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, false, 0, 0); |
| 71 | glErrorShouldBe(gl, gl.NO_ERROR, "after texture coordinate / color redefinition"); |
| 72 | |
| 73 | var numQuads = 2; |
| 74 | var indices = new Uint8Array(numQuads * 6); |
| 75 | for (var ii = 0; ii < numQuads; ++ii) { |
| 76 | var offset = ii * 6; |
| 77 | var quad = (ii == (numQuads - 1)) ? 4 : 0; |
| 78 | indices[offset + 0] = quad + 0; |
| 79 | indices[offset + 1] = quad + 1; |
| 80 | indices[offset + 2] = quad + 2; |
| 81 | indices[offset + 3] = quad + 2; |
| 82 | indices[offset + 4] = quad + 1; |
| 83 | indices[offset + 5] = quad + 3; |
| 84 | } |
| 85 | var indexObject = gl.createBuffer(); |
| 86 | gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexObject); |
| 87 | gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW); |
| 88 | glErrorShouldBe(gl, gl.NO_ERROR, "after setting up indices"); |
| 89 | gl.drawElements(gl.TRIANGLES, numQuads * 6, gl.UNSIGNED_BYTE, 0); |
| 90 | glErrorShouldBe(gl, gl.NO_ERROR, "after drawing"); |
| 91 | |
| 92 | debug("") |
| kbr@google.com | ae73e94 | 2010-06-28 17:41:40 +0000 | [diff] [blame] | 93 | </script> |
| kbr@google.com | ae73e94 | 2010-06-28 17:41:40 +0000 | [diff] [blame] | 94 | </body> |
| 95 | </html> |
