X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=init.cpp;h=2bade83c782fbc1e7d2d152b6ff0b0004515f2bd;hp=f6f45a04dde17331b385ec4aca77df8dd6e77fa7;hb=refs%2Fheads%2F1.3.x-release;hpb=70f86335e039280a182119c3055aabeae01713bc diff --git a/init.cpp b/init.cpp index f6f45a0..2bade83 100644 --- a/init.cpp +++ b/init.cpp @@ -16,8 +16,9 @@ bool movit_initialized = false; MovitDebugLevel movit_debug_level = MOVIT_DEBUG_ON; float movit_texel_subpixel_precision; bool movit_srgb_textures_supported; +bool movit_timer_queries_supported; int movit_num_wrongly_rounded; -bool movit_shader_rounding_supported; +MovitShaderModel movit_shader_model; // The rules for objects with nontrivial constructors in static scope // are somewhat convoluted, and easy to mess up. We simply have a @@ -77,8 +78,11 @@ void measure_texel_subpixel_precision() glViewport(0, 0, width, 1); + vector frag_shader_outputs; GLuint glsl_program_num = resource_pool.compile_glsl_program( - read_file("vs.vert"), read_file("texture1d.frag")); + read_version_dependent_file("vs", "vert"), + read_version_dependent_file("texture1d", "frag"), + frag_shader_outputs); glUseProgram(glsl_program_num); check_error(); glUniform1i(glGetUniformLocation(glsl_program_num, "tex"), 0); // Bind the 2D sampler. @@ -208,8 +212,11 @@ void measure_roundoff_problems() glViewport(0, 0, 512, 1); + vector frag_shader_outputs; GLuint glsl_program_num = resource_pool.compile_glsl_program( - read_file("vs.vert"), read_file("texture1d.frag")); + read_version_dependent_file("vs", "vert"), + read_version_dependent_file("texture1d", "frag"), + frag_shader_outputs); glUseProgram(glsl_program_num); check_error(); glUniform1i(glGetUniformLocation(glsl_program_num, "tex"), 0); // Bind the 2D sampler. @@ -275,65 +282,123 @@ void measure_roundoff_problems() check_error(); } +struct RequiredExtension { + int min_equivalent_gl_version; + const char extension_name[64]; +}; +const RequiredExtension required_extensions[] = { + // We fundamentally need FBOs and floating-point textures. + // FBOs are covered by OpenGL 1.5, and are not an extension there. + // Floating-point textures are part of OpenGL 3.0 and newer. + { 15, "GL_ARB_framebuffer_object" }, + { 30, "GL_ARB_texture_float" }, + + // We assume that we can use non-power-of-two textures without restrictions. + { 20, "GL_ARB_texture_non_power_of_two" }, + + // We also need GLSL fragment shaders. + { 20, "GL_ARB_fragment_shader" }, + { 20, "GL_ARB_shading_language_100" }, + + // FlatInput and YCbCrInput uses PBOs. (They could in theory do without, + // but no modern card would really not provide it.) + { 21, "GL_ARB_pixel_buffer_object" }, + + // ResampleEffect uses RG textures to encode a two-component LUT. + // We also need GL_R several places, for single-channel input. + { 30, "GL_ARB_texture_rg" }, +}; + bool check_extensions() { // GLES generally doesn't use extensions as actively as desktop OpenGL. // For now, we say that for GLES, we require GLES 3, which has everything // we need. - // - // Since we use implicit #version 100, we don't have round(). We will - // fix this at some later stage. if (!epoxy_is_desktop_gl()) { if (epoxy_gl_version() >= 30) { movit_srgb_textures_supported = true; - movit_shader_rounding_supported = false; + return true; } else { + fprintf(stderr, "Movit system requirements: GLES version %.1f is too old (GLES 3.0 needed).\n", + 0.1f * epoxy_gl_version()); + fprintf(stderr, "Movit initialization failed.\n"); return false; } } - // We fundamentally need FBOs and floating-point textures. - // FBOs are covered by OpenGL 1.5, and are not an extension there. - // Floating-point textures are part of OpenGL 3.0 and newer. - if (epoxy_gl_version() < 15 && - !epoxy_has_gl_extension("GL_ARB_framebuffer_object")) return false; - if (epoxy_gl_version() < 30 && - !epoxy_has_gl_extension("GL_ARB_texture_float")) return false; - - // We assume that we can use non-power-of-two textures without restrictions. - if (epoxy_gl_version() < 20 && - !epoxy_has_gl_extension("GL_ARB_texture_non_power_of_two")) return false; - - // We also need GLSL fragment shaders. - if (epoxy_gl_version() < 20) { - if (!epoxy_has_gl_extension("GL_ARB_fragment_shader")) return false; - if (!epoxy_has_gl_extension("GL_ARB_shading_language_100")) return false; + // Check all extensions, and output errors for the ones that we are missing. + bool all_ok = true; + int gl_version = epoxy_gl_version(); + + for (unsigned i = 0; i < sizeof(required_extensions) / sizeof(required_extensions[0]); ++i) { + if (gl_version < required_extensions[i].min_equivalent_gl_version && + !epoxy_has_gl_extension(required_extensions[i].extension_name)) { + fprintf(stderr, "Movit system requirements: Needs extension '%s' or at least OpenGL version %.1f (has version %.1f)\n", + required_extensions[i].extension_name, + 0.1f * required_extensions[i].min_equivalent_gl_version, + 0.1f * gl_version); + all_ok = false; + } } - // FlatInput and YCbCrInput uses PBOs. (They could in theory do without, - // but no modern card would really not provide it.) - if (epoxy_gl_version() < 21 && - !epoxy_has_gl_extension("GL_ARB_pixel_buffer_object")) return false; - - // ResampleEffect uses RG textures to encode a two-component LUT. - if (epoxy_gl_version() < 30 && - !epoxy_has_gl_extension("GL_ARB_texture_rg")) return false; + if (!all_ok) { + fprintf(stderr, "Movit initialization failed.\n"); + return false; + } // sRGB texture decode would be nice, but are not mandatory // (GammaExpansionEffect can do the same thing if needed). movit_srgb_textures_supported = (epoxy_gl_version() >= 21 || epoxy_has_gl_extension("GL_EXT_texture_sRGB")); - // We may want to use round() at the end of the final shader, - // if supported. We need either GLSL 1.30 or this extension to do that, - // and 1.30 brings with it other things that we don't want to demand - // for now. - movit_shader_rounding_supported = - (epoxy_gl_version() >= 30 || epoxy_has_gl_extension("GL_EXT_gpu_shader4")); + // The user can specify that they want a timing report for each + // phase in an effect chain. However, that depends on this extension; + // without it, we do cannot even create the query objects. + movit_timer_queries_supported = + (epoxy_gl_version() >= 33 || epoxy_has_gl_extension("GL_ARB_timer_query")); return true; } +double get_glsl_version() +{ + char *glsl_version_str = strdup((const char *)glGetString(GL_SHADING_LANGUAGE_VERSION)); + + // Skip past the first period. + char *ptr = strchr(glsl_version_str, '.'); + assert(ptr != NULL); + ++ptr; + + // Now cut the string off at the next period or space, whatever comes first + // (unless the string ends first). + while (*ptr && *ptr != '.' && *ptr != ' ') { + ++ptr; + } + *ptr = '\0'; + + // Now we have something on the form X.YY. We convert it to a float, and hope + // that if it's inexact (e.g. 1.30), atof() will round the same way the + // compiler will. + std::istringstream locale_convert(glsl_version_str); + locale_convert.imbue(std::locale("C")); + double glsl_version; + locale_convert >> glsl_version; + free(glsl_version_str); + + return glsl_version; +} + +void APIENTRY debug_callback(GLenum source, + GLenum type, + GLuint id, + GLenum severity, + GLsizei length, + const char *message, + const void *userParam) +{ + printf("Debug: %s\n", message); +} + } // namespace bool init_movit(const string& data_directory, MovitDebugLevel debug_level) @@ -350,9 +415,38 @@ bool init_movit(const string& data_directory, MovitDebugLevel debug_level) glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glDisable(GL_DITHER); + // You can turn this on if you want detailed debug messages from the driver. + // You should probably also ask for a debug context (see gtest_sdl_main.cpp), + // or you might not get much data back. + // glDebugMessageCallbackARB(callback, NULL); + // glDebugMessageControlARB(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, 0, GL_TRUE); + if (!check_extensions()) { return false; } + + // Find out what shader model we should compile for. + // We need at least 1.30, due to use of (among others) integers. + if (epoxy_is_desktop_gl()) { + if (get_glsl_version() < 1.30f) { + fprintf(stderr, "Movit system requirements: Needs at least GLSL version 1.30 (has version %.1f)\n", + get_glsl_version()); + return false; + } + if (get_glsl_version() < 1.50f) { + movit_shader_model = MOVIT_GLSL_130; + } else { + // Note: All of our 1.50 shaders are identical to our 1.30 shaders, + // but OS X does not support 1.30; only 1.10 (which we don't support + // anymore) and 1.50 (and then only with core contexts). So we keep + // a second set of shaders around whose only difference is the different + // #version declaration. + movit_shader_model = MOVIT_GLSL_150; + } + } else { + movit_shader_model = MOVIT_ESSL_300; + } + measure_texel_subpixel_precision(); measure_roundoff_problems();