#include "renderer_gl/opengl_capabilities.h"
#include "test_harness.h"

#include <array>
#include <string_view>

namespace {

void detects_common_extension_capabilities(pp::tests::Harness& h)
{
    constexpr std::array<std::string_view, 2> extensions {
        "GL_EXT_shader_framebuffer_fetch",
        "GL_ARB_map_buffer_alignment",
    };

    const auto capabilities = pp::renderer::gl::detect_opengl_capabilities(
        extensions,
        pp::renderer::gl::OpenGlRuntime {});

    PP_EXPECT(h, capabilities.framebuffer_fetch);
    PP_EXPECT(h, capabilities.map_buffer_alignment);
    PP_EXPECT(h, !capabilities.float32_textures);
    PP_EXPECT(h, !capabilities.float16_textures);
}

void treats_desktop_gl_float_rendering_as_core(pp::tests::Harness& h)
{
    const auto capabilities = pp::renderer::gl::detect_opengl_capabilities(
        {},
        pp::renderer::gl::OpenGlRuntime { .desktop_gl = true });

    PP_EXPECT(h, capabilities.float32_textures);
    PP_EXPECT(h, capabilities.float32_linear);
    PP_EXPECT(h, capabilities.float16_textures);
}

void detects_gles_texture_float_extensions(pp::tests::Harness& h)
{
    constexpr std::array<std::string_view, 3> extensions {
        "GL_OES_texture_float",
        "GL_OES_texture_float_linear",
        "GL_EXT_color_buffer_half_float",
    };

    const auto capabilities = pp::renderer::gl::detect_opengl_capabilities(
        extensions,
        pp::renderer::gl::OpenGlRuntime { .gles = true });

    PP_EXPECT(h, capabilities.float32_textures);
    PP_EXPECT(h, capabilities.float32_linear);
    PP_EXPECT(h, capabilities.float16_textures);
}

void ignores_gles_texture_extensions_for_webgl_runtime(pp::tests::Harness& h)
{
    constexpr std::array<std::string_view, 3> extensions {
        "GL_OES_texture_float",
        "GL_OES_texture_float_linear",
        "GL_EXT_color_buffer_half_float",
    };

    const auto capabilities = pp::renderer::gl::detect_opengl_capabilities(
        extensions,
        pp::renderer::gl::OpenGlRuntime { .gles = true, .web = true });

    PP_EXPECT(h, !capabilities.float32_textures);
    PP_EXPECT(h, !capabilities.float32_linear);
    PP_EXPECT(h, !capabilities.float16_textures);
}

}

int main()
{
    pp::tests::Harness harness;
    harness.run("detects_common_extension_capabilities", detects_common_extension_capabilities);
    harness.run("treats_desktop_gl_float_rendering_as_core", treats_desktop_gl_float_rendering_as_core);
    harness.run("detects_gles_texture_float_extensions", detects_gles_texture_float_extensions);
    harness.run("ignores_gles_texture_extensions_for_webgl_runtime", ignores_gles_texture_extensions_for_webgl_runtime);
    return harness.finish();
}