Add a test that verifies resizing works. Incidentially, it is the first test that...
[movit] / effect_chain_test.cpp
index 585df22..2ae38dd 100644 (file)
@@ -204,3 +204,131 @@ TEST(EffectChainTest, IdentityThroughRec709) {
 
        expect_equal(data, out_data, 256, 1);
 }
+
+// Effectively scales down its input linearly by 4x (and repeating it),
+// which is not attainable without mipmaps.
+class MipmapNeedingEffect : public Effect {
+public:
+       MipmapNeedingEffect() {}
+       virtual bool needs_mipmaps() const { return true; }
+       virtual std::string effect_type_id() const { return "MipmapNeedingEffect"; }
+       std::string output_fragment_shader() { return read_file("mipmap_needing_effect.frag"); }
+       void set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num)
+       {
+               glActiveTexture(GL_TEXTURE0);
+               check_error();
+               glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+               check_error();
+               glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+               check_error();
+       }
+};
+
+TEST(EffectChainTest, MipmapGenerationWorks) {
+       float data[] = {  // In 4x4 blocks.
+               1.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 1.0f,
+
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.5f, 0.0f, 0.0f,
+               0.0f, 0.0f, 1.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 1.0f, 1.0f, 0.0f,
+               0.0f, 1.0f, 1.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+       };
+       float expected_data[] = {  // Repeated four times each way.
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+       };
+       float out_data[4 * 16];
+       EffectChainTester tester(data, 4, 16, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+       tester.get_chain()->add_effect(new MipmapNeedingEffect());
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(expected_data, out_data, 4, 16);
+}
+
+TEST(EffectChainTest, ResizeDownByFourThenUpByFour) {
+       float data[] = {  // In 4x4 blocks.
+               1.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 1.0f,
+
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.5f, 0.0f, 0.0f,
+               0.0f, 0.0f, 1.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 1.0f, 1.0f, 0.0f,
+               0.0f, 1.0f, 1.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+       };
+       float expected_data[] = {  // Repeated four times horizontaly, interpolated vertically.
+               0.1250f, 0.1250f, 0.1250f, 0.1250f,
+               0.1250f, 0.1250f, 0.1250f, 0.1250f,
+               0.1211f, 0.1211f, 0.1211f, 0.1211f,
+               0.1133f, 0.1133f, 0.1133f, 0.1133f,
+               0.1055f, 0.1055f, 0.1055f, 0.1055f,
+               0.0977f, 0.0977f, 0.0977f, 0.0977f,
+               0.2070f, 0.2070f, 0.2070f, 0.2070f,
+               0.4336f, 0.4336f, 0.4336f, 0.4336f,
+               0.6602f, 0.6602f, 0.6602f, 0.6602f,
+               0.8867f, 0.8867f, 0.8867f, 0.8867f,
+               0.9062f, 0.9062f, 0.9062f, 0.9062f,
+               0.7188f, 0.7188f, 0.7188f, 0.7188f,
+               0.5312f, 0.5312f, 0.5312f, 0.5312f,
+               0.3438f, 0.3438f, 0.3438f, 0.3438f,
+               0.2500f, 0.2500f, 0.2500f, 0.2500f,
+               0.2500f, 0.2500f, 0.2500f, 0.2500f,
+       };
+       float out_data[4 * 16];
+
+       ResizeEffect *downscale = new ResizeEffect();
+       ASSERT_TRUE(downscale->set_int("width", 1));
+       ASSERT_TRUE(downscale->set_int("height", 4));
+
+       ResizeEffect *upscale = new ResizeEffect();
+       ASSERT_TRUE(upscale->set_int("width", 4));
+       ASSERT_TRUE(upscale->set_int("height", 16));
+
+       EffectChainTester tester(data, 4, 16, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+       tester.get_chain()->add_effect(downscale);
+       tester.get_chain()->add_effect(upscale);
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(expected_data, out_data, 4, 16);
+}