| <!DOCTYPE html> |
| <html> |
| <head> |
| <title>WebGL GLSL uniform sampler2D array unused element test.</title> |
| <script src="../../../resources/js-test.js"></script> |
| <script src="resources/webgl-test.js"> </script> |
| <script src="resources/webgl-test-utils.js"> </script> |
| </head> |
| <body> |
| <canvas id="example" width="256" height="16" style="width: 256px; height: 48px;"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script> |
| description("Test that GLSL uniform sampler2D arrays work in presence of unused elements."); |
| // Test for a bug where unused elements in a sampler array caused the used elements be |
| // marked unused and thus the bingins were not consider not part of the rendering state. |
| const wtu = WebGLTestUtils; |
| const maxTestedArrayLength = 4; |
| const setupTextureFragmentWithUnusedSamplerArrayShader = function(gl, usedArrayElement) { |
| const s = [ |
| 'precision mediump float;', |
| `uniform sampler2D tex[${maxTestedArrayLength}];`, |
| 'varying vec2 texCoord;', |
| 'void main() {', |
| ` gl_FragData[0] = texture2D(tex[${usedArrayElement}], texCoord);`, |
| '}'].join('\n'); |
| return loadShader(gl, s, gl.FRAGMENT_SHADER); |
| }; |
| const setupTextureProgramWithUnusedSamplerArray = function( |
| gl, usedArrayElement, opt_positionLocation, opt_texcoordLocation) { |
| opt_positionLocation = opt_positionLocation || 0; |
| opt_texcoordLocation = opt_texcoordLocation || 1; |
| const vs = wtu.setupSimpleTextureVertexShader(gl); |
| const fs = setupTextureFragmentWithUnusedSamplerArrayShader(gl, usedArrayElement); |
| if (!vs || !fs) { |
| return null; |
| } |
| const program = wtu.setupProgram( |
| gl, |
| [vs, fs], |
| ['vPosition', 'texCoord0'], |
| [opt_positionLocation, opt_texcoordLocation]); |
| if (!program) { |
| gl.deleteShader(fs); |
| gl.deleteShader(vs); |
| } |
| gl.useProgram(program); |
| return program; |
| }; |
| const checkCanvasPixelSilentPass = function(gl, expectedColor, msg) { |
| const pass = () => {}; |
| const fail = () => { testFailed(msg); }; |
| wtu.checkCanvasRectColor(gl, 0, 0, 1, 1, expectedColor, 0, pass, fail, debug); |
| }; |
| |
| const canvas = document.getElementById("example"); |
| const gl = wtu.create3DContext(canvas); |
| wtu.setupUnitQuad(gl); |
| const tex = gl.createTexture(); |
| gl.bindTexture(gl.TEXTURE_2D, tex); |
| gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST); |
| gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, 1, 1, 0, gl.RGB, gl.UNSIGNED_BYTE, |
| new Uint8Array([0, 255, 0])); |
| gl.bindTexture(gl.TEXTURE_2D, null); |
| const maxTextureImageUnits = gl.getParameter(gl.MAX_TEXTURE_IMAGE_UNITS); |
| |
| for (let testArrayElement = 0; |
| testArrayElement < maxTestedArrayLength; ++testArrayElement) { |
| const program = setupTextureProgramWithUnusedSamplerArray(gl, testArrayElement); |
| const loc = gl.getUniformLocation(program, `tex[${testArrayElement}]`); |
| gl.deleteProgram(program); |
| glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from setup"); |
| for (let ii = 0; ii < maxTextureImageUnits; ++ii) { |
| gl.uniform1i(loc, ii); |
| gl.activeTexture(gl.TEXTURE0 + ii); |
| gl.bindTexture(gl.TEXTURE_2D, tex); |
| wtu.drawQuad(gl, [1.0, 0, 0, 1.0]); |
| checkCanvasPixelSilentPass(gl, [0, 255, 0, 255], |
| 'Can draw with the shader that has unused samplers in an array.' + |
| `Used sampler: ${testArrayElement}, texture unit: ${ii}`); |
| gl.bindTexture(gl.TEXTURE_2D, null); |
| } |
| } |
| </script> |
| </body> |
| </html> |
