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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef GEOMETRYBUFFER_H
#define GEOMETRYBUFFER_H
#include "Rendering/GL/FBO.h"
#include "System/type2.h"
namespace GL {
struct GeometryBuffer {
public:
enum {
ATTACHMENT_NORMTEX = 0, // shading (not geometric) normals
ATTACHMENT_DIFFTEX = 1, // diffuse texture fragments
ATTACHMENT_SPECTEX = 2, // specular texture fragments
ATTACHMENT_EMITTEX = 3, // emissive texture fragments
ATTACHMENT_MISCTEX = 4, // custom data for LuaObjectRendering shaders
ATTACHMENT_ZVALTEX = 5, // fragment depth-values (must be last)
ATTACHMENT_COUNT = 6,
};
GeometryBuffer(const char* id): name(id) { Init(true); }
~GeometryBuffer() { Kill(true); }
void Init(bool ctor);
void Kill(bool dtor);
void Clear() const;
void DetachTextures(const bool init);
void DrawDebug(const unsigned int texID, const float2 texMins, const float2 texMaxs) const;
void DrawDebug(const unsigned int texID) const { DrawDebug(texID, float2(0.0f, 0.0f), float2(1.0f, 1.0f)); }
bool HasAttachments() const { return (bufferTextureIDs[0] != 0); }
bool Valid() const { return (buffer.IsValid()); }
bool Create(const int2 size);
bool Update(const bool init);
GLuint GetTextureTarget() const { return (msaa? GL_TEXTURE_2D_MULTISAMPLE: GL_TEXTURE_2D); }
GLuint GetBufferTexture(unsigned int idx) const { return bufferTextureIDs[idx]; }
GLuint GetBufferAttachment(unsigned int idx) const { return bufferAttachments[idx]; }
const FBO& GetObject() const { return buffer; }
FBO& GetObject() { return buffer; }
void Bind() { assert(!dead && !bound); buffer.Bind(); bound = true; }
void UnBind() { assert(!dead && bound); buffer.Unbind(); bound = false; }
void SetDepthRange(float nearDepth, float farDepth) const;
int2 GetCurrSize() const { return currBufferSize; }
int2 GetPrevSize() const { return prevBufferSize; }
int2 GetWantedSize(bool allowed) const;
private:
FBO buffer;
GLuint bufferTextureIDs[ATTACHMENT_COUNT];
GLenum bufferAttachments[ATTACHMENT_COUNT];
int2 prevBufferSize;
int2 currBufferSize;
const char* name = "";
bool dead = false;
bool bound = false;
bool msaa = false;
};
}
#endif
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