Port the WebGL2 framebuffer-texture-changing-base-level test to native
A nearly direct port of the https://www.khronos.org/registry/webgl/sdk/tests/conformance2/rendering/framebuffer-texture-changing-base-level.html
test for easier debugging.
BUG=angleproject:2291
Change-Id: Ibc8a7e77629f1ea3f15e92ea93f1210fa850c524
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1584361
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Shrek Shao <shrekshao@google.com>
diff --git a/src/tests/gl_tests/TextureTest.cpp b/src/tests/gl_tests/TextureTest.cpp
index 3aad142..a8ae80c 100644
--- a/src/tests/gl_tests/TextureTest.cpp
+++ b/src/tests/gl_tests/TextureTest.cpp
@@ -1765,6 +1765,77 @@
drawQuad(mProgram, "position", 1.0f);
}
+// This test case changes the base level of a texture that's attached to a framebuffer, clears every
+// level to green, and then samples the texture when rendering. Test is taken from
+// https://www.khronos.org/registry/webgl/sdk/tests/conformance2/rendering/framebuffer-texture-changing-base-level.html
+TEST_P(Texture2DTestES3, FramebufferTextureChangingBaselevel)
+{
+ // TODO(geofflang): Investigate on D3D11. http://anglebug.com/2291
+ ANGLE_SKIP_TEST_IF(IsD3D11());
+
+ setUpProgram();
+
+ constexpr GLint width = 8;
+ constexpr GLint height = 4;
+
+ GLTexture texture;
+ glBindTexture(GL_TEXTURE_2D, texture);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+ // Create all mipmap levels for the texture from level 0 to the 1x1 pixel level.
+ GLint level = 0;
+ GLint levelW = width;
+ GLint levelH = height;
+ glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, levelW, levelH, 0, GL_RGBA, GL_UNSIGNED_BYTE,
+ nullptr);
+ while (levelW > 1 || levelH > 1)
+ {
+ ++level;
+ levelW = static_cast<GLint>(std::max(1.0, std::floor(width / std::pow(2, level))));
+ levelH = static_cast<GLint>(std::max(1.0, std::floor(height / std::pow(2, level))));
+ glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, levelW, levelH, 0, GL_RGBA, GL_UNSIGNED_BYTE,
+ nullptr);
+ }
+
+ // Clear each level of the texture using an FBO. Change the base level to match the level used
+ // for the FBO on each iteration.
+ GLFramebuffer fbo;
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ level = 0;
+ levelW = width;
+ levelH = height;
+ while (levelW > 1 || levelH > 1)
+ {
+ levelW = static_cast<GLint>(std::floor(width / std::pow(2, level)));
+ levelH = static_cast<GLint>(std::floor(height / std::pow(2, level)));
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, level);
+ glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, level);
+
+ EXPECT_GLENUM_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
+ EXPECT_GL_NO_ERROR();
+
+ glClearColor(0, 1, 0, 1);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
+
+ ++level;
+ }
+
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+ glViewport(0, 0, 16, 16);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+
+ drawQuad(mProgram, "position", 0.5f);
+
+ EXPECT_GL_NO_ERROR();
+ EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
+}
+
// Test to check that texture completeness is determined correctly when the texture base level is
// greater than 0, and also that level 0 is not sampled when base level is greater than 0.
TEST_P(Texture2DTestES3, DrawWithBaseLevel1)
