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<title>WebGL OVR_multiview2 Conformance Tests</title>
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"use strict";

let wtu = WebGLTestUtils;
let gl = wtu.create3DContext(null, null, 2);
let ext = null;

function runSingleViewReadTest()
{
    debug("");
    debug("Testing reading from a multiview framebuffer with num_views = 1");

    let width = 256;
    let height = 256;
    let depth = 2;  // always supported so no need to query MAX_VIEWS_OVR.

    let fb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
    gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

    gl.viewport(0, 0, width, height);
    gl.clearColor(0.0, 1.0, 1.0, 1.0);
    gl.clear(gl.COLOR_BUFFER_BIT);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

    let buf = new Uint8Array(width * height * 4);
    gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from readPixels");

    wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'view 0 should be cyan');
    gl.getError();

    // Also test for the error case with two views
    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
    gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
    wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to read from a framebuffer with two views");
}

function runSingleViewBlitTest()
{
    debug("");
    debug("Testing blitting from a multiview framebuffer with num_views = 1");

    let width = 256;
    let height = 256;
    let depth = 2;  // always supported so no need to query MAX_VIEWS_OVR.

    let fb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
    gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

    gl.viewport(0, 0, width, height);
    gl.clearColor(0.0, 1.0, 1.0, 1.0);
    gl.clear(gl.COLOR_BUFFER_BIT);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

    gl.canvas.width = width;
    gl.canvas.height = height;
    gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, null);
    gl.clearColor(0.0, 0.0, 0.0, 0.0)
    gl.clear(gl.COLOR_BUFFER_BIT);
    gl.blitFramebuffer(0, 0, width, height, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from blitFramebuffer");

    gl.bindFramebuffer(gl.FRAMEBUFFER, null);
    wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'view 0 blitted to the default framebuffer should be cyan');

    // Also test for the error case with multiview blit target
    gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, fb);
    gl.blitFramebuffer(0, 0, width, height, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
    wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to blit to a multiview framebuffer even if it has just one view");

    // Also test for the error case with two views
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
    gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, null);
    gl.blitFramebuffer(0, 0, width, height, 0, 0, width, height, gl.COLOR_BUFFER_BIT, gl.NEAREST);
    wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to blit from a framebuffer with two views");
}

function runSingleViewCopyTexImage2DTest()
{
    debug("");
    debug("Testing copyTexImage2D from a multiview framebuffer with num_views = 1");

    let width = 256;
    let height = 256;
    let depth = 2;  // always supported so no need to query MAX_VIEWS_OVR.

    let fb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
    gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

    gl.viewport(0, 0, width, height);
    gl.clearColor(0.0, 1.0, 1.0, 1.0);
    gl.clear(gl.COLOR_BUFFER_BIT);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

    let copyTargetTex = createTextureWithNearestFiltering(gl.TEXTURE_2D);
    gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
    gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, 0, 0, width, height, 0);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from copyTexImage2D");

    let copyFb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.FRAMEBUFFER, copyFb);
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, copyTargetTex, 0);
    wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'copy of view 0 in the 2D texture should be cyan');

    // Also test for the error case with two views
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
    gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
    gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, 0, 0, width, height, 0);
    wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to copy from a framebuffer with two views");
}

function runSingleViewCopyTexSubImage2DTest()
{
    debug("");
    debug("Testing copyTexSubImage2D from a multiview framebuffer with num_views = 1");

    let width = 256;
    let height = 256;
    let depth = 2;  // always supported so no need to query MAX_VIEWS_OVR.

    let fb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
    gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

    gl.viewport(0, 0, width, height);
    gl.clearColor(0.0, 1.0, 1.0, 1.0);
    gl.clear(gl.COLOR_BUFFER_BIT);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

    let copyTargetTex = createTextureWithNearestFiltering(gl.TEXTURE_2D);
    gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
    gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, width, height);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from copyTexImage2D");

    let copyFb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.FRAMEBUFFER, copyFb);
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, copyTargetTex, 0);
    wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'copy of view 0 in the 2D texture should be cyan');

    // Also test for the error case with two views
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
    gl.bindTexture(gl.TEXTURE_2D, copyTargetTex);
    gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, width, height);
    wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to copy from a framebuffer with two views");
}

function runSingleViewCopyTexSubImage3DTest()
{
    debug("");
    debug("Testing copyTexSubImage3D from a multiview framebuffer with num_views = 1");

    let width = 256;
    let height = 256;
    let depth = 2;  // always supported so no need to query MAX_VIEWS_OVR.

    let fb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
    gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

    gl.viewport(0, 0, width, height);
    gl.clearColor(0.0, 1.0, 1.0, 1.0);
    gl.clear(gl.COLOR_BUFFER_BIT);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from clear");

    let copyTargetTex = createTextureWithNearestFiltering(gl.TEXTURE_3D);
    gl.bindTexture(gl.TEXTURE_3D, copyTargetTex);
    gl.texImage3D(gl.TEXTURE_3D, 0, gl.RGBA8, width, height, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
    gl.copyTexSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, 0, 0, width, height);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from copyTexSubImage3D");

    let copyFb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.FRAMEBUFFER, copyFb);
    gl.framebufferTextureLayer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, copyTargetTex, 0, 0);
    wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 255, 255], 'copy of view 0 in the 3D texture should be cyan');

    // Also test for the error case with two views
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
    gl.bindTexture(gl.TEXTURE_3D, copyTargetTex);
    gl.copyTexSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, 0, 0, width, height);
    wtu.glErrorShouldBe(gl, gl.INVALID_FRAMEBUFFER_OPERATION, "should be an error to copy from a framebuffer with two views");
}

description("This test verifies that framebuffers with only one view can be read from with OVR_multiview2 extension, if it is available.");

debug("");

if (!gl) {
  testFailed("WebGL context does not exist");
} else {
  testPassed("WebGL context exists");

  if (!gl.getExtension("OVR_multiview2")) {
      testPassed("No OVR_multiview2 support -- this is legal");
  } else {
      testPassed("Successfully enabled OVR_multiview2 extension");
      ext = gl.getExtension('OVR_multiview2');

      runSingleViewReadTest();

      runSingleViewBlitTest();

      runSingleViewCopyTexImage2DTest();

      runSingleViewCopyTexSubImage2DTest();

      runSingleViewCopyTexSubImage3DTest();
  }
}

debug("");
var successfullyParsed = true;
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