GLContext.hh

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#ifndef GL_CONTEXT_HH
#define GL_CONTEXT_HH
 
#include "GLUtil.hh"
#include "gl_mat.hh"
#include <memory>
#include <optional>
 
namespace openmsx { class GLScaler; }
 
namespace gl {
 
struct Context
{
        Context();
        ~Context();
 
        // Simple texture program. It expects
        //  uniforms:
        //    unifTexColor: values from texture map are multiplied by this 4D color
        //    unifTexMvp: Model-View-Projection-matrix
        //  attributes:
        //    0: 4D vertex positions, get multiplied by Model-View-Projection-matrix
        //    1: 2D texture coordinates
        //  textures:
        //    the to be applied texture must be bound to the 1st texture unit
        ShaderProgram progTex;
        GLint unifTexColor;
        GLint unifTexMvp;
 
        // Simple color-fill program. It expects
        //  uniforms:
        //    unifFillMvp: Model-View-Projection-matrix
        //  attributes:
        //    0: 4D vertex positions, get multiplied by Model-View-Projection-matrix
        //    1: 4D vertex color
        ShaderProgram progFill;
        GLint unifFillMvp;
 
        // Model-View-Projection-matrix that maps integer vertex positions to host
        // display pixel positions. (0,0) is the top-left pixel, (width-1,height-1) is
        // the bottom-right pixel.
        mat4 pixelMvp;
 
        // Fallback scaler
        openmsx::GLScaler& getFallbackScaler();
 
        // Setup model-view-projection matrix. Should be called before drawing,
        // at least once after the window resolution has changed. (E.g. call it
        // once per frame).
        void setupMvpMatrix(gl::vec2 logicalSize);
 
private:
        std::unique_ptr<openmsx::GLScaler> fallbackScaler;
};
 
extern std::optional<Context> context;
 
} // namespace gl
 
#endif