| <!DOCTYPE html> |
| <html> |
| <head> |
| <script src="../../../resources/js-test-pre.js"></script> |
| <script src="resources/webgl-test.js"> </script> |
| </head> |
| <body> |
| <canvas id="example" width="40" height="40" style="width: 40px; height: 40px;"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script id="vshader" type="x-shader/x-vertex"> |
| #ifdef GL_ES |
| precision highp float; |
| #endif |
| attribute vec4 vPosition; |
| void main() |
| { |
| gl_Position = vPosition; |
| } |
| </script> |
| |
| <script id="fshader" type="x-shader/x-fragment"> |
| #ifdef GL_ES |
| precision highp float; |
| #endif |
| void main() |
| { |
| gl_FragColor = vec4(0, 1, 0, 1); |
| } |
| </script> |
| |
| <script> |
| function init() |
| { |
| if (window.initNonKhronosFramework) |
| window.initNonKhronosFramework(false); |
| |
| debug("Checks that update-draws of bufferSubData are respected"); |
| debug(""); |
| |
| if (window.internals) |
| internals.settings.setWebGL2Enabled(true); |
| gl = initWebGL("example", "vshader", "fshader", [ "vPosition", "index" ], |
| [ 1, 1, 1, 1 ], 1, null, true); |
| |
| gl.disable(gl.DEPTH_TEST); |
| gl.disable(gl.BLEND); |
| |
| // Vertex buffer data lower left triangle |
| // 2 |
| // |
| // o 1 |
| var vertexData1 = new Float32Array([-1, -1, 1, -1, -1, 1]); |
| //Vertex buffer data upper right triangle |
| // 2 1 |
| // |
| // 0 |
| var vertexData2 = new Float32Array([ 1., -1., 1., 1., -1., 1.]); |
| |
| var vertexObject = gl.createBuffer(); |
| gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject); |
| shouldBe("gl.getError()", "gl.NO_ERROR") |
| gl.bufferData(gl.ARRAY_BUFFER, vertexData1, gl.DYNAMIC_DRAW); |
| shouldBe("gl.getError()", "gl.NO_ERROR"); |
| gl.enableVertexAttribArray(0); |
| gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0); |
| shouldBe("gl.getError()", "gl.NO_ERROR"); |
| gl.drawArrays(gl.TRIANGLES, 0, 3); |
| gl.bufferData(gl.ARRAY_BUFFER, vertexData2, gl.DYNAMIC_DRAW); |
| shouldBe("gl.getError()", "gl.NO_ERROR"); |
| gl.drawArrays(gl.TRIANGLES, 0, 3); |
| gl.flush(); |
| checkGreenValue(0, 0, 255, "top-left of canvas should be green."); |
| checkGreenValue(0, 39, 255, "bottom-left of canvas should be green."); |
| checkGreenValue(39, 0, 255, "Top-right of canvas should be green."); |
| checkGreenValue(39, 39, 255, "bottom-right of canvas should be green."); |
| gl.deleteBuffer(vertexObject); |
| |
| function checkGreenValue(x, y, value, msg) { |
| |
| var buf = new Uint8Array(4); |
| gl.readPixels(x, y, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, buf); |
| if (buf[1] != value || buf[3] != 255) { |
| debug('expected: green channel should = ' + value + ' but was = ' + buf[2] + '.'); |
| testFailed(msg); |
| return; |
| } |
| testPassed(msg); |
| } |
| } |
| |
| init(); |
| </script> |
| <script src="../../../resources/js-test-post.js"></script> |
| </body> |
| </html> |
