svercl / blah

a small 2d c++ game framework thing

blah

A small 2D C++ Game Framework, using few dependencies and simple code to mainain easy building and portability.

☆ This will likely see breaking changes! Use at your own risk! ☆

building

• Requires C++17 and CMake 3.14+
• A single Platform implementation must be enabled:
  • SDL2 can be enabled in CMake with BLAH_PLATFORM_SDL2 (default)
  • WIN32 (UNFINISHED) can be enabled in CMake with BLAH_PLATFORM_WIN32
  • Additional platforms can be added by implementing the Platform Backend
• A single Graphics implementation must be enabled:
  • OpenGL can be enabled in CMake with BLAH_GRAPHICS_OPENGL (default)
  • D3D11 can be enabled in CMake with BLAH_GRAPHICS_D3D11
  • Additional graphics can be added by implementing the Graphics Backend

notes

• There's no Shader abstraction, so the Sprite Batcher has hard-coded GLSL/HLSL. This will need to change.
• Only floatN/mat3x2/mat4x4 uniforms are supported.
• There's no Audio API or backend implementation yet.
• No threaded rendering so it will explode if you try that.

a sample application

#include <blah.h>
using namespace Blah;

Batch batch;
TextureRef tex;

void startup()
{
	tex = Texture::create("player.png");
}

void render()
{
	App::backbuffer->clear(Color::black);
	
	auto center = Vec2f(App::backbuffer->width(), App::backbuffer->height()) / 2;
	auto rotation = Time::seconds * Calc::TAU;
	auto transform = Mat3x2f::create_transform(center, Vec2f::zero, Vec2f::one, rotation);

	batch.push_matrix(transform);
	batch.rect(Rectf(-32, -32, 64, 64), Color::red);
	batch.tex(tex, Vec2f(64, 0), Color::white);
	batch.pop_matrix();
	
	batch.render();
	batch.clear();
}

int main()
{
	Config config;
	config.name = "blah app";
	config.width = 1280;
	config.height = 720;
	config.on_startup = startup;
	config.on_render = render;
	
	App::run(&config);
	return 0;
}