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/**
* @file llrender.h
* @brief LLRender definition
*
* This class acts as a wrapper for OpenGL calls.
* The goal of this class is to minimize the number of api calls due to legacy rendering
* code, to define an interface for a multiple rendering API abstraction of the UI
* rendering, and to abstract out direct rendering calls in a way that is cleaner and easier to maintain.
*
* $LicenseInfo:firstyear=2001&license=viewergpl$
*
* Copyright (c) 2001-2008, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLGLRENDER_H
#define LL_LLGLRENDER_H
#include "stdtypes.h"
#include "llgltypes.h"
#include "llglheaders.h"
#include "llvertexbuffer.h"
class LLTexUnit
{
public:
typedef enum
{
TB_REPLACE = 0,
TB_ADD,
TB_MULT,
TB_MULT_X2,
TB_ALPHA_BLEND,
TB_COMBINE // Doesn't need to be set directly, setTexture___Blend() set TB_COMBINE automatically
} eTextureBlendType;
typedef enum
{
TBO_REPLACE = 0, // Use Source 1
TBO_MULT, // Multiply: ( Source1 * Source2 )
TBO_MULT_X2, // Multiply then scale by 2: ( 2.0 * ( Source1 * Source2 ) )
TBO_MULT_X4, // Multiply then scale by 4: ( 4.0 * ( Source1 * Source2 ) )
TBO_ADD, // Add: ( Source1 + Source2 )
TBO_ADD_SIGNED, // Add then subtract 0.5: ( ( Source1 + Source2 ) - 0.5 )
TBO_SUBTRACT, // Subtract Source2 from Source1: ( Source1 - Source2 )
TBO_LERP_VERT_ALPHA, // Interpolate based on Vertex Alpha (VA): ( Source1 * VA + Source2 * (1-VA) )
TBO_LERP_TEX_ALPHA, // Interpolate based on Texture Alpha (TA): ( Source1 * TA + Source2 * (1-TA) )
TBO_LERP_PREV_ALPHA, // Interpolate based on Previous Alpha (PA): ( Source1 * PA + Source2 * (1-PA) )
TBO_LERP_CONST_ALPHA, // Interpolate based on Const Alpha (CA): ( Source1 * CA + Source2 * (1-CA) )
TBO_LERP_VERT_COLOR // Interpolate based on Vertex Col (VC): ( Source1 * VC + Source2 * (1-VC) )
// *Note* TBO_LERP_VERTEX_COLOR only works with setTextureColorBlend(),
// and falls back to TBO_LERP_VERTEX_ALPHA for setTextureAlphaBlend().
} eTextureBlendOp;
typedef enum
{
TBS_PREV_COLOR = 0, // Color from the previous texture stage
TBS_PREV_ALPHA,
TBS_ONE_MINUS_PREV_COLOR,
TBS_ONE_MINUS_PREV_ALPHA,
TBS_TEX_COLOR, // Color from the texture bound to this stage
TBS_TEX_ALPHA,
TBS_ONE_MINUS_TEX_COLOR,
TBS_ONE_MINUS_TEX_ALPHA,
TBS_VERT_COLOR, // The vertex color currently set
TBS_VERT_ALPHA,
TBS_ONE_MINUS_VERT_COLOR,
TBS_ONE_MINUS_VERT_ALPHA,
TBS_CONST_COLOR, // The constant color value currently set
TBS_CONST_ALPHA,
TBS_ONE_MINUS_CONST_COLOR,
TBS_ONE_MINUS_CONST_ALPHA
} eTextureBlendSrc;
LLTexUnit(U32 index);
U32 getIndex(void);
void enable(void);
void disable(void);
void activate(void);
void bindTexture(const LLImageGL* texture);
void unbindTexture(void);
void setTextureBlendType(eTextureBlendType type);
inline void setTextureColorBlend(eTextureBlendOp op, eTextureBlendSrc src1, eTextureBlendSrc src2 = TBS_PREV_COLOR)
{ setTextureCombiner(op, src1, src2, false); }
// NOTE: If *_COLOR enums are passed to src1 or src2, the corresponding *_ALPHA enum will be used instead.
inline void setTextureAlphaBlend(eTextureBlendOp op, eTextureBlendSrc src1, eTextureBlendSrc src2 = TBS_PREV_ALPHA)
{ setTextureCombiner(op, src1, src2, true); }
private:
U32 mIndex;
bool mIsEnabled;
eTextureBlendType mCurrBlendType;
eTextureBlendOp mCurrColorOp;
eTextureBlendSrc mCurrColorSrc1;
eTextureBlendSrc mCurrColorSrc2;
eTextureBlendOp mCurrAlphaOp;
eTextureBlendSrc mCurrAlphaSrc1;
eTextureBlendSrc mCurrAlphaSrc2;
S32 mCurrColorScale;
S32 mCurrAlphaScale;
void debugTextureUnit(void);
void setColorScale(S32 scale);
void setAlphaScale(S32 scale);
GLint getTextureSource(eTextureBlendSrc src);
GLint getTextureSourceType(eTextureBlendSrc src, bool isAlpha = false);
void setTextureCombiner(eTextureBlendOp op, eTextureBlendSrc src1, eTextureBlendSrc src2, bool isAlpha = false);
};
class LLRender
{
friend class LLTexUnit;
public:
typedef enum
{
CF_NEVER = 0,
CF_ALWAYS,
CF_LESS,
CF_LESS_EQUAL,
CF_EQUAL,
CF_NOT_EQUAL,
CF_GREATER_EQUAL,
CF_GREATER,
CF_DEFAULT
} eCompareFunc;
typedef enum
{
BT_ALPHA = 0,
BT_ADD,
BT_ADD_WITH_ALPHA, // Additive blend modulated by the fragment's alpha.
BT_MULT,
BT_MULT_X2,
BT_REPLACE
} eBlendType;
typedef enum
{
BF_ONE = 0,
BF_ZERO,
BF_DEST_COLOR,
BF_SOURCE_COLOR,
BF_ONE_MINUS_DEST_COLOR,
BF_ONE_MINUS_SOURCE_COLOR,
BF_DEST_ALPHA,
BF_SOURCE_ALPHA,
BF_ONE_MINUS_DEST_ALPHA,
BF_ONE_MINUS_SOURCE_ALPHA
} eBlendFactor;
LLRender();
~LLRender();
void translatef(const GLfloat& x, const GLfloat& y, const GLfloat& z);
void scalef(const GLfloat& x, const GLfloat& y, const GLfloat& z);
void pushMatrix();
void popMatrix();
void flush();
void begin(const GLuint& mode);
void end();
void vertex2i(const GLint& x, const GLint& y);
void vertex2f(const GLfloat& x, const GLfloat& y);
void vertex3f(const GLfloat& x, const GLfloat& y, const GLfloat& z);
void vertex2fv(const GLfloat* v);
void vertex3fv(const GLfloat* v);
void texCoord2i(const GLint& x, const GLint& y);
void texCoord2f(const GLfloat& x, const GLfloat& y);
void texCoord2fv(const GLfloat* tc);
void color4ub(const GLubyte& r, const GLubyte& g, const GLubyte& b, const GLubyte& a);
void color4f(const GLfloat& r, const GLfloat& g, const GLfloat& b, const GLfloat& a);
void color4fv(const GLfloat* c);
void color3f(const GLfloat& r, const GLfloat& g, const GLfloat& b);
void color3fv(const GLfloat* c);
void color4ubv(const GLubyte* c);
void setColorMask(bool writeColor, bool writeAlpha);
void setColorMask(bool writeColorR, bool writeColorG, bool writeColorB, bool writeAlpha);
void setSceneBlendType(eBlendType type);
void setAlphaRejectSettings(eCompareFunc func, F32 value = 0.01f);
void blendFunc(eBlendFactor sfactor, eBlendFactor dfactor);
LLTexUnit* getTexUnit(U32 index);
typedef struct Vertex
{
GLfloat v[3];
GLubyte c[4];
GLfloat uv[2];
};
public:
private:
U32 mCount;
U32 mMode;
U32 mCurrTextureUnitIndex;
LLPointer<LLVertexBuffer> mBuffer;
LLStrider<LLVector3> mVerticesp;
LLStrider<LLVector2> mTexcoordsp;
LLStrider<LLColor4U> mColorsp;
std::vector<LLTexUnit*> mTexUnits;
};
extern F64 gGLModelView[16];
extern F64 gGLLastModelView[16];
extern F64 gGLProjection[16];
extern S32 gGLViewport[4];
extern LLRender gGL;
#endif
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