+// Just an IdentityEffect, but marks as needing mipmaps, so that we can use it
+// for downscaling to verify mipmaps were used.
+class MipmapNeedingEffect : public Effect {
+public:
+ MipmapNeedingEffect() {}
+ MipmapRequirements needs_mipmaps() const override { return NEEDS_MIPMAPS; }
+
+ string effect_type_id() const override { return "MipmapNeedingEffect"; }
+ string output_fragment_shader() override { return read_file("identity.frag"); }
+
+private:
+ EffectChain *chain;
+};
+
+TEST(FlatInput, ExternalTextureMipmapState) {
+ const int width = 4;
+ const int height = 4;
+
+ float data[width * height] = {
+ 1.0, 0.0, 0.0, 0.0,
+ 0.0, 0.0, 0.0, 0.0,
+ 0.0, 0.0, 0.0, 0.0,
+ 0.0, 0.0, 0.0, 0.0,
+ };
+ float expected_data[] = {
+ 0.0625,
+ };
+ float out_data[1];
+
+ EffectChainTester tester(nullptr, 1, 1, FORMAT_RGB, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_LINEAR;
+
+ ResourcePool pool;
+ GLuint tex = pool.create_2d_texture(GL_R8, width, height);
+ check_error();
+ glBindTexture(GL_TEXTURE_2D, tex);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
+ check_error();
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ check_error();
+ glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RED, GL_FLOAT, data);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ check_error();
+ glGenerateMipmap(GL_TEXTURE_2D);
+ check_error();
+
+ // Turn off mipmaps, so that we verify that Movit turns it back on.
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ check_error();
+
+ FlatInput *input = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, width, height);
+ input->set_texture_num(tex);
+ tester.get_chain()->add_input(input);
+ tester.get_chain()->add_effect(new MipmapNeedingEffect);
+
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ pool.release_2d_texture(tex);
+
+ expect_equal(expected_data, out_data, 1, 1);
+}
+