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| |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>WebGL WEBGL_draw_buffers gl_FragData[gl_MaxDrawBuffers] Conformance Test</title> |
| <link rel="stylesheet" href="../../resources/js-test-style.css"/> |
| <script src="../../js/js-test-pre.js"></script> |
| <script src="../../js/webgl-test-utils.js"></script> |
| </head> |
| <body> |
| <div id="description"></div> |
| <canvas id="canvas" width="64" height="64"> </canvas> |
| <div id="console"></div> |
| <script id="vshader" type="x-shader/x-vertex"> |
| attribute vec4 a_position; |
| void main() { |
| gl_Position = a_position; |
| } |
| </script> |
| <script id="fshader" type="x-shader/x-fragment"> |
| #extension GL_EXT_draw_buffers : require |
| precision mediump float; |
| void main() { |
| gl_FragData[gl_MaxDrawBuffers] = vec4(0.0); |
| } |
| </script> |
| <script id="fshaderConstantIndex" type="x-shader/x-fragment"> |
| #extension GL_EXT_draw_buffers : require |
| precision mediump float; |
| void main() { |
| gl_FragData[$(gl_MaxDrawBuffers)] = vec4(0.0); |
| } |
| </script> |
| <script id="fshaderTestMaxDrawBuffersValue" type="x-shader/x-fragment"> |
| #extension GL_EXT_draw_buffers : require |
| precision mediump float; |
| void main() { |
| gl_FragColor = ($(gl_MaxDrawBuffers) == gl_MaxDrawBuffers) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1); |
| } |
| </script> |
| <script> |
| "use strict"; |
| description("This test verifies that compiling the same shader using GL_EXT_draw_buffers twice will have similar results on both rounds."); |
| |
| debug(""); |
| |
| var wtu = WebGLTestUtils; |
| var canvas = document.getElementById("canvas"); |
| var gl = wtu.create3DContext(canvas); |
| var ext = null; |
| var maxDrawBuffers; |
| |
| if (!gl) { |
| testFailed("WebGL context does not exist"); |
| } else { |
| testPassed("WebGL context exists"); |
| |
| ext = gl.getExtension("WEBGL_draw_buffers"); |
| if (!ext) { |
| testPassed("No WEBGL_draw_buffers support -- this is legal"); |
| finishTest(); |
| } else { |
| testPassed("Successfully enabled WEBGL_draw_buffers extension"); |
| maxDrawBuffers = gl.getParameter(ext.MAX_DRAW_BUFFERS_WEBGL); |
| runShadersTest(); |
| finishTest(); |
| } |
| } |
| |
| function testValueOfMaxDrawBuffers() { |
| debug("Test the value of gl_MaxDrawBuffers in a shader"); |
| var fshader = wtu.replaceParams(wtu.getScript("fshaderTestMaxDrawBuffersValue"), {"gl_MaxDrawBuffers": maxDrawBuffers}); |
| var program = wtu.setupProgram(gl, ["vshader", fshader], ["a_position"], undefined, true); |
| expectTrue(program != null, "Test program should compile"); |
| wtu.setupUnitQuad(gl); |
| wtu.clearAndDrawUnitQuad(gl); |
| wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green to indicate that gl_MaxDrawBuffers had the right value"); |
| gl.deleteProgram(program); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors"); |
| } |
| |
| function runSingleTest(shaders, indexMsg) { |
| var program = wtu.setupProgram(gl, shaders, ["a_position"], undefined, true); |
| var programLinkedSuccessfully = (program != null); |
| expectTrue(!programLinkedSuccessfully, "Program where gl_FragData is indexed by " + indexMsg + " should fail compilation."); |
| gl.deleteProgram(program); |
| } |
| |
| function runShadersTest() { |
| debug("MAX_DRAW_BUFFERS_WEBGL is: " + maxDrawBuffers); |
| |
| // For reference, use a constant out-of-range parameter to test: |
| debug("Test indexing gl_FragData with value of MAX_DRAW_BUFFERS_WEBGL"); |
| var fshader = wtu.replaceParams(wtu.getScript("fshaderConstantIndex"), {"gl_MaxDrawBuffers": maxDrawBuffers}); |
| runSingleTest(["vshader", fshader], maxDrawBuffers + " (value of MAX_DRAW_BUFFERS_WEBGL)"); |
| |
| debug(""); |
| |
| debug("Test indexing gl_FragData with gl_MaxDrawBuffers"); |
| debug("Repeat this test twice as that has revealed a bug."); |
| for (var i = 0; i < 2; ++i) { |
| runSingleTest(["vshader", "fshader"], "gl_MaxDrawBuffers"); |
| } |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors"); |
| |
| debug(""); |
| |
| testValueOfMaxDrawBuffers(); |
| } |
| </script> |
| </body> |
| </html> |