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renderer: modular render window and context creation
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| Original file line number | Diff line number | Diff line change |
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| add_sources(${PROJECT_NAME} | ||
| context.cpp | ||
| tests.cpp | ||
| window.cpp | ||
| ) | ||
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| add_demo_cpp(openage::renderer::tests::renderer_demo "open the render window") | ||
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| #add_subdirectory(gl2/) | ||
| #add_subdirectory(gl3/) | ||
| #add_subdirectory(vulkan/) |
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| // Copyright 2015-2015 the openage authors. See copying.md for legal info. | ||
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| #include "window.h" | ||
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| #include <epoxy/gl.h> | ||
| #include <SDL2/SDL.h> | ||
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| #include "../log/log.h" | ||
| #include "../util/error.h" | ||
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| namespace openage { | ||
| namespace renderer { | ||
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| #if WITH_OPENGL | ||
| // TODO: get max available gl version | ||
| constexpr int opengl_version_major = 2; | ||
| constexpr int opengl_version_minor = 1; | ||
| #endif | ||
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| Context::Context(context_type t) | ||
| : | ||
| type{t} { | ||
| if (this->type == context_type::opengl and not WITH_OPENGL) { | ||
| throw util::Error(MSG(err) << "OpenGL support not enabled!"); | ||
| } | ||
| else if (this->type == context_type::vulkan and not WITH_VULKAN) { | ||
| throw util::Error(MSG(err) << "Vulkan support not enabled!"); | ||
| } | ||
| else if (this->type == context_type::autodetect) { | ||
| // priority: vulkan > opengl | ||
| if (WITH_VULKAN) { | ||
| this->type = context_type::vulkan; | ||
| } | ||
| else if (WITH_OPENGL) { | ||
| this->type = context_type::opengl; | ||
| } | ||
| else { | ||
| throw util::Error(MSG(err) << "No render context available!"); | ||
| } | ||
| } | ||
| else { | ||
| throw util::Error(MSG(err) << "Unknown context type requested!"); | ||
| } | ||
| } | ||
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| Context::~Context() {} | ||
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| void Context::prepare() { | ||
| switch (this->type) { | ||
| #if WITH_OPENGL | ||
| case context_type::opengl: | ||
| this->prepare_gl(); | ||
| break; | ||
| #endif | ||
| #if WITH_VULKAN | ||
| case context_type::vulkan: | ||
| // TODO; | ||
| break; | ||
| #endif | ||
| default: | ||
| throw util::Error(MSG(err) << "Unknown context to be prepared!"); | ||
| }; | ||
| } | ||
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| uint32_t Context::get_window_flags() { | ||
| switch (this->type) { | ||
| #if WITH_OPENGL | ||
| case context_type::opengl: | ||
| return SDL_WINDOW_OPENGL; | ||
| #endif | ||
| #if WITH_VULKAN | ||
| case context_type::vulkan: | ||
| return SDL_WINDOW_VULKAN; | ||
| #endif | ||
| default: | ||
| throw util::Error(MSG(err) << "Unknown context w-flags requested!"); | ||
| }; | ||
| } | ||
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| void Context::create(SDL_Window *window) { | ||
| switch (this->type) { | ||
| #if WITH_OPENGL | ||
| case context_type::opengl: | ||
| this->create_gl(window); | ||
| break; | ||
| #endif | ||
| #if WITH_VULKAN | ||
| case context_type::vulkan: | ||
| // TODO | ||
| break; | ||
| #endif | ||
| default: | ||
| throw util::Error(MSG(err) << "Unknown context to be created!"); | ||
| }; | ||
| } | ||
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| void Context::setup() { | ||
| switch (this->type) { | ||
| #if WITH_OPENGL | ||
| case context_type::opengl: | ||
| this->setup_gl(); | ||
| break; | ||
| #endif | ||
| #if WITH_VULKAN | ||
| case context_type::vulkan: | ||
| // TODO | ||
| break; | ||
| #endif | ||
| default: | ||
| throw util::Error(MSG(err) << "Unknown context to be set up!"); | ||
| }; | ||
| } | ||
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| void Context::destroy() { | ||
| switch (this->type) { | ||
| #if WITH_OPENGL | ||
| case context_type::opengl: | ||
| this->destroy_gl(); | ||
| break; | ||
| #endif | ||
| #if WITH_VULKAN | ||
| case context_type::vulkan: | ||
| // TODO | ||
| break; | ||
| #endif | ||
| default: | ||
| throw util::Error(MSG(err) << "Unknown context to be set up!"); | ||
| }; | ||
| } | ||
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| #if WITH_OPENGL | ||
| void Context::prepare_gl() { | ||
| SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE); | ||
| SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, opengl_version_major); | ||
| SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, opengl_version_minor); | ||
| SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1); | ||
| SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); | ||
| SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24); | ||
| } | ||
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| void Context::create_gl(SDL_Window *window) { | ||
| this->glcontext = SDL_GL_CreateContext(window); | ||
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| if (this->glcontext == nullptr) { | ||
| throw util::Error(MSG(err) << "Failed creating OpenGL context: " << SDL_GetError()); | ||
| } | ||
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| // check the OpenGL version, for shaders n stuff | ||
| int epoxy_glv = opengl_version_major * 10 + opengl_version_minor; | ||
| if (not epoxy_is_desktop_gl() or epoxy_gl_version() < epoxy_glv) { | ||
| throw util::Error(MSG(err) << "OpenGL " | ||
| << opengl_version_major << "." << opengl_version_minor | ||
| << " not available"); | ||
| } | ||
| } | ||
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| void Context::setup_gl() { | ||
| // to quote the standard doc: 'The value gives a rough estimate of the | ||
| // largest texture that the GL can handle' | ||
| // -> wat? anyways, we need at least 1024x1024. | ||
| int max_texture_size; | ||
| glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size); | ||
| log::log(MSG(dbg) << "Maximum supported texture size: " << max_texture_size); | ||
| if (max_texture_size < 1024) { | ||
| throw util::Error(MSG(err) << "Maximum supported texture size too small: " << max_texture_size); | ||
| } | ||
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| int max_texture_units; | ||
| glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_texture_units); | ||
| log::log(MSG(dbg) << "Maximum supported texture units: " << max_texture_units); | ||
| if (max_texture_units < 2) { | ||
| throw util::Error(MSG(err) << "Your GPU has too less texture units: " << max_texture_units); | ||
| } | ||
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| // vsync on | ||
| SDL_GL_SetSwapInterval(1); | ||
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| // TODO: move the following statements to some other place. | ||
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| // enable alpha blending | ||
| glEnable(GL_BLEND); | ||
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| // order of drawing relevant for depth | ||
| // what gets drawn last is displayed on top. | ||
| glDisable(GL_DEPTH_TEST); | ||
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| glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); | ||
| } | ||
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| void Context::destroy_gl() { | ||
| SDL_GL_DeleteContext(this->glcontext); | ||
| } | ||
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| #endif | ||
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| }} // namespace openage::renderer |
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