+// A dummy effect whose only purpose is to test sprintf decimal behavior.
+class PrintfingBlueEffect : public Effect {
+public:
+ PrintfingBlueEffect() {}
+ virtual string effect_type_id() const { return "PrintfingBlueEffect"; }
+ string output_fragment_shader() {
+ stringstream ss;
+ ss.imbue(locale("C"));
+ ss.precision(8);
+ ss << "vec4 FUNCNAME(vec2 tc) { return vec4("
+ << 0.0f << ", " << 0.0f << ", "
+ << 0.5f << ", " << 1.0f << "); }\n";
+ return ss.str();
+ }
+};
+
+TEST(EffectChainTest, StringStreamLocalesWork) {
+ // An example of a locale with comma instead of period as decimal separator.
+ // Obviously, if you run on a machine without this locale available,
+ // the test will always succeed. Note that the OpenGL driver might call
+ // setlocale() behind-the-scenes, and that might corrupt the returned
+ // pointer, so we need to take our own copy of it here.
+ char *saved_locale = setlocale(LC_ALL, "nb_NO.UTF_8");
+ if (saved_locale == NULL) {
+ // The locale wasn't available.
+ return;
+ }
+ saved_locale = strdup(saved_locale);
+ float data[] = {
+ 0.0f, 0.0f, 0.0f, 0.0f,
+ };
+ float expected_data[] = {
+ 0.0f, 0.0f, 0.5f, 1.0f,
+ };
+ float out_data[4];
+ EffectChainTester tester(data, 1, 1, FORMAT_RGBA_PREMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
+ tester.get_chain()->add_effect(new PrintfingBlueEffect());
+ tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ expect_equal(expected_data, out_data, 4, 1);
+
+ setlocale(LC_ALL, saved_locale);
+ free(saved_locale);
+}
+
+TEST(EffectChainTest, sRGBIntermediate) {
+ float data[] = {
+ 0.0f, 0.5f, 0.0f, 1.0f,
+ };
+ float out_data[4];
+ EffectChainTester tester(data, 1, 1, FORMAT_RGBA_PREMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
+ tester.get_chain()->set_intermediate_format(GL_SRGB8);
+ tester.get_chain()->add_effect(new IdentityEffect());
+ tester.get_chain()->add_effect(new BouncingIdentityEffect());
+ tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ EXPECT_GE(fabs(out_data[1] - data[1]), 1e-3)
+ << "Expected sRGB not to be able to represent 0.5 exactly (got " << out_data[1] << ")";
+ EXPECT_LT(fabs(out_data[1] - data[1]), 0.1f)
+ << "Expected sRGB to be able to represent 0.5 approximately (got " << out_data[1] << ")";
+}
+
+// An effect that is like IdentityEffect, but also does not require linear light.
+class PassThroughEffect : public IdentityEffect {
+public:
+ PassThroughEffect() {}
+ virtual string effect_type_id() const { return "PassThroughEffect"; }
+ virtual bool needs_linear_light() const { return false; }
+ AlphaHandling alpha_handling() const { return DONT_CARE_ALPHA_TYPE; }
+};
+
+// Same, just also bouncing.
+class BouncingPassThroughEffect : public BouncingIdentityEffect {
+public:
+ BouncingPassThroughEffect() {}
+ virtual string effect_type_id() const { return "BouncingPassThroughEffect"; }
+ virtual bool needs_linear_light() const { return false; }
+ bool needs_texture_bounce() const { return true; }
+ AlphaHandling alpha_handling() const { return DONT_CARE_ALPHA_TYPE; }
+};
+
+TEST(EffectChainTest, Linear10bitIntermediateAccuracy) {
+ // Note that we do the comparison in sRGB space, which is what we
+ // typically would want; however, we do the sRGB conversion ourself
+ // to avoid compounding errors from shader conversions into the
+ // analysis.
+ const int size = 4096; // 12-bit.
+ float linear_data[size], data[size], out_data[size];
+
+ for (int i = 0; i < size; ++i) {
+ linear_data[i] = i / double(size - 1);
+ data[i] = srgb_to_linear(linear_data[i]);
+ }
+
+ EffectChainTester tester(data, size, 1, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR, GL_RGBA32F);
+ tester.get_chain()->set_intermediate_format(GL_RGB10_A2);
+ tester.get_chain()->add_effect(new IdentityEffect());
+ tester.get_chain()->add_effect(new BouncingIdentityEffect());
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ for (int i = 0; i < size; ++i) {
+ out_data[i] = linear_to_srgb(out_data[i]);
+ }
+
+ // This maximum error is pretty bad; about 6.5 levels of a 10-bit sRGB
+ // framebuffer.
+ expect_equal(linear_data, out_data, size, 1, 7e-3, 2e-5);
+}
+
+TEST(EffectChainTest, SquareRoot10bitIntermediateAccuracy) {
+ // Note that we do the comparison in sRGB space, which is what we
+ // typically would want; however, we do the sRGB conversion ourself
+ // to avoid compounding errors from shader conversions into the
+ // analysis.
+ const int size = 4096; // 12-bit.
+ float linear_data[size], data[size], out_data[size];
+
+ for (int i = 0; i < size; ++i) {
+ linear_data[i] = i / double(size - 1);
+ data[i] = srgb_to_linear(linear_data[i]);
+ }
+
+ EffectChainTester tester(data, size, 1, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR, GL_RGBA32F);
+ tester.get_chain()->set_intermediate_format(GL_RGB10_A2, SQUARE_ROOT_FRAMEBUFFER_TRANSFORMATION);
+ tester.get_chain()->add_effect(new IdentityEffect());
+ tester.get_chain()->add_effect(new BouncingIdentityEffect());
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ for (int i = 0; i < size; ++i) {
+ out_data[i] = linear_to_srgb(out_data[i]);
+ }
+
+ // This maximum error is much better; about 0.7 levels of a 10-bit sRGB
+ // framebuffer (ideal would be 0.5). That is an order of magnitude better
+ // than in the linear test above. The RMS error is much better, too.
+ expect_equal(linear_data, out_data, size, 1, 7e-4, 5e-6);
+}
+
+TEST(EffectChainTest, SquareRootIntermediateIsTurnedOffForNonLinearData) {
+ const int size = 256; // 8-bit.
+ float data[size], out_data[size];
+
+ for (int i = 0; i < size; ++i) {
+ data[i] = i / double(size - 1);
+ }
+
+ EffectChainTester tester(data, size, 1, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_REC_601, GL_RGBA32F);
+ tester.get_chain()->set_intermediate_format(GL_RGB8, SQUARE_ROOT_FRAMEBUFFER_TRANSFORMATION);
+ tester.get_chain()->add_effect(new PassThroughEffect());
+ tester.get_chain()->add_effect(new BouncingPassThroughEffect());
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_REC_601);
+
+ // The data should be passed through nearly exactly, since there is no effect
+ // on the path that requires linear light. (Actually, it _is_ exact modulo
+ // fp32 errors, but the error bounds is strictly _less than_, not zero.)
+ expect_equal(data, out_data, size, 1, 1e-6, 1e-6);
+}
+
+// An effect that stores which program number was last run under.
+class RecordingIdentityEffect : public Effect {
+public:
+ RecordingIdentityEffect() {}
+ virtual string effect_type_id() const { return "RecordingIdentityEffect"; }
+ string output_fragment_shader() { return read_file("identity.frag"); }
+
+ GLuint last_glsl_program_num;
+ void set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num)
+ {
+ last_glsl_program_num = glsl_program_num;
+ }
+};
+
+TEST(EffectChainTest, ProgramsAreClonedForMultipleThreads) {
+ float data[] = {
+ 0.0f, 0.25f, 0.3f,
+ 0.75f, 1.0f, 1.0f,
+ };
+ float out_data[6];
+ EffectChainTester tester(data, 3, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ RecordingIdentityEffect *effect = new RecordingIdentityEffect();
+ tester.get_chain()->add_effect(effect);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ expect_equal(data, out_data, 3, 2);
+
+ ASSERT_NE(0, effect->last_glsl_program_num);
+
+ // Now pretend some other effect is using this program number;
+ // ResourcePool will then need to clone it.
+ ResourcePool *resource_pool = tester.get_chain()->get_resource_pool();
+ GLuint master_program_num = resource_pool->use_glsl_program(effect->last_glsl_program_num);
+ EXPECT_EQ(effect->last_glsl_program_num, master_program_num);
+
+ // Re-run should still give the correct data, but it should have run
+ // with a different program.
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+ expect_equal(data, out_data, 3, 2);
+ EXPECT_NE(effect->last_glsl_program_num, master_program_num);
+
+ // Release the program, and check one final time.
+ resource_pool->unuse_glsl_program(master_program_num);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+ expect_equal(data, out_data, 3, 2);
+}
+