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TexEnvCombine @ 13041

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1	/* --c++-- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2	*
3	* This library is open source and may be redistributed and/or modified under
4	* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5	* (at your option) any later version. The full license is in LICENSE file
6	* included with this distribution, and on the openscenegraph.org website.
7	*
8	* This library is distributed in the hope that it will be useful,
9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11	* OpenSceneGraph Public License for more details.
12	*/
13
14	#ifndef OSG_TEXENVCOMBINE
15	#define OSG_TEXENVCOMBINE 1
16
17	#include <osg/TexEnv>
18	#include <osg/Vec3>
19	#include <osg/Vec4>
20
21	// If not defined by gl.h use the definition found in:
22	// http://oss.sgi.com/projects/ogl-sample/registry/ARB/texture_env_combine.txt
23	#ifndef GL_ARB_texture_env_combine
24	#define GL_COMBINE_ARB 0x8570
25	#define GL_COMBINE_RGB_ARB 0x8571
26	#define GL_COMBINE_ALPHA_ARB 0x8572
27	#define GL_SOURCE0_RGB_ARB 0x8580
28	#define GL_SOURCE1_RGB_ARB 0x8581
29	#define GL_SOURCE2_RGB_ARB 0x8582
30	#define GL_SOURCE0_ALPHA_ARB 0x8588
31	#define GL_SOURCE1_ALPHA_ARB 0x8589
32	#define GL_SOURCE2_ALPHA_ARB 0x858A
33	#define GL_OPERAND0_RGB_ARB 0x8590
34	#define GL_OPERAND1_RGB_ARB 0x8591
35	#define GL_OPERAND2_RGB_ARB 0x8592
36	#define GL_OPERAND0_ALPHA_ARB 0x8598
37	#define GL_OPERAND1_ALPHA_ARB 0x8599
38	#define GL_OPERAND2_ALPHA_ARB 0x859A
39	#define GL_RGB_SCALE_ARB 0x8573
40	#define GL_ADD_SIGNED_ARB 0x8574
41	#define GL_INTERPOLATE_ARB 0x8575
42	#define GL_SUBTRACT_ARB 0x84E7
43	#define GL_CONSTANT_ARB 0x8576
44	#define GL_PRIMARY_COLOR_ARB 0x8577
45	#define GL_PREVIOUS_ARB 0x8578
46	#endif
47
48	#ifndef GL_ARB_texture_env_dot3
49	#define GL_DOT3_RGB_ARB 0x86AE
50	#define GL_DOT3_RGBA_ARB 0x86AF
51	#endif
52
53	#ifndef GL_TEXTURE0
54	#define GL_TEXTURE0 0x84C0
55	#endif
56
57	namespace osg {
58
59	/** TexEnvCombine encapsulates the OpenGL glTexEnvCombine (texture
60	* environment) state. */
61	class OSG_EXPORT TexEnvCombine : public StateAttribute
62	{
63	public :
64
65	TexEnvCombine();
66
67	/** Copy constructor using CopyOp to manage deep vs shallow copy. */
68	TexEnvCombine(const TexEnvCombine& texenv,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
69	StateAttribute(texenv,copyop),
70	_needsTexEnvCrossbar(texenv._needsTexEnvCrossbar),
71	_combine_RGB(texenv._combine_RGB),
72	_combine_Alpha(texenv._combine_Alpha),
73	_source0_RGB(texenv._source0_RGB),
74	_source1_RGB(texenv._source1_RGB),
75	_source2_RGB(texenv._source2_RGB),
76	_source0_Alpha(texenv._source0_Alpha),
77	_source1_Alpha(texenv._source1_Alpha),
78	_source2_Alpha(texenv._source2_Alpha),
79	_operand0_RGB(texenv._operand0_RGB),
80	_operand1_RGB(texenv._operand1_RGB),
81	_operand2_RGB(texenv._operand2_RGB),
82	_operand0_Alpha(texenv._operand0_Alpha),
83	_operand1_Alpha(texenv._operand1_Alpha),
84	_operand2_Alpha(texenv._operand2_Alpha),
85	_scale_RGB(texenv._scale_RGB),
86	_scale_Alpha(texenv._scale_Alpha),
87	_constantColor(texenv._constantColor) {}
88
89
90	META_StateAttribute(osg, TexEnvCombine, TEXENV);
91
92
93	virtual bool isTextureAttribute() const { return true; }
94
95	/** Return -1 if this < rhs, 0 if this==rhs, 1 if this>rhs. */
96	virtual int compare(const StateAttribute& sa) const
97	{
98	// Check for equal types, then create the rhs variable
99	// used by the COMPARE_StateAttribute_parameter macros below.
100	COMPARE_StateAttribute_Types(TexEnvCombine,sa)
101
102	// Compare each parameter in turn against the rhs.
103	COMPARE_StateAttribute_Parameter(_needsTexEnvCrossbar)
104	COMPARE_StateAttribute_Parameter(_combine_RGB)
105	COMPARE_StateAttribute_Parameter(_combine_Alpha)
106	COMPARE_StateAttribute_Parameter(_source0_RGB)
107	COMPARE_StateAttribute_Parameter(_source1_RGB)
108	COMPARE_StateAttribute_Parameter(_source2_RGB)
109	COMPARE_StateAttribute_Parameter(_source0_Alpha)
110	COMPARE_StateAttribute_Parameter(_source1_Alpha)
111	COMPARE_StateAttribute_Parameter(_source2_Alpha)
112	COMPARE_StateAttribute_Parameter(_operand0_RGB)
113	COMPARE_StateAttribute_Parameter(_operand1_RGB)
114	COMPARE_StateAttribute_Parameter(_operand2_RGB)
115	COMPARE_StateAttribute_Parameter(_operand0_Alpha)
116	COMPARE_StateAttribute_Parameter(_operand1_Alpha)
117	COMPARE_StateAttribute_Parameter(_operand2_Alpha)
118	COMPARE_StateAttribute_Parameter(_scale_RGB)
119	COMPARE_StateAttribute_Parameter(_scale_Alpha)
120	COMPARE_StateAttribute_Parameter(_constantColor)
121
122	return 0; // Passed all the above comparison macros, so must be equal.
123	}
124
125
126	enum CombineParam
127	{
128	REPLACE = GL_REPLACE,
129	MODULATE = GL_MODULATE,
130	ADD = GL_ADD,
131	ADD_SIGNED = GL_ADD_SIGNED_ARB,
132	INTERPOLATE = GL_INTERPOLATE_ARB,
133	SUBTRACT = GL_SUBTRACT_ARB,
134	DOT3_RGB = GL_DOT3_RGB_ARB,
135	DOT3_RGBA = GL_DOT3_RGBA_ARB
136	};
137
138	void setCombine_RGB(GLint cm);
139	void setCombine_Alpha(GLint cm);
140
141	GLint getCombine_RGB() const { return _combine_RGB; }
142	GLint getCombine_Alpha() const { return _combine_Alpha; }
143
144	enum SourceParam
145	{
146	CONSTANT = GL_CONSTANT_ARB,
147	PRIMARY_COLOR = GL_PRIMARY_COLOR_ARB,
148	PREVIOUS = GL_PREVIOUS_ARB,
149	TEXTURE = GL_TEXTURE,
150	TEXTURE0 = GL_TEXTURE0,
151	TEXTURE1 = GL_TEXTURE0+1,
152	TEXTURE2 = GL_TEXTURE0+2,
153	TEXTURE3 = GL_TEXTURE0+3,
154	TEXTURE4 = GL_TEXTURE0+4,
155	TEXTURE5 = GL_TEXTURE0+5,
156	TEXTURE6 = GL_TEXTURE0+6,
157	TEXTURE7 = GL_TEXTURE0+7
158	};
159
160	void setSource0_RGB(GLint sp);
161	void setSource1_RGB(GLint sp);
162	void setSource2_RGB(GLint sp);
163
164	void setSource0_Alpha(GLint sp);
165	void setSource1_Alpha(GLint sp);
166	void setSource2_Alpha(GLint sp);
167
168	GLint getSource0_RGB() const { return _source0_RGB; }
169	GLint getSource1_RGB() const { return _source1_RGB; }
170	GLint getSource2_RGB() const { return _source2_RGB; }
171
172	GLint getSource0_Alpha() const { return _source0_Alpha; }
173	GLint getSource1_Alpha() const { return _source1_Alpha; }
174	GLint getSource2_Alpha() const { return _source2_Alpha; }
175
176	enum OperandParam
177	{
178	SRC_COLOR = GL_SRC_COLOR,
179	ONE_MINUS_SRC_COLOR = GL_ONE_MINUS_SRC_COLOR,
180	SRC_ALPHA = GL_SRC_ALPHA,
181	ONE_MINUS_SRC_ALPHA = GL_ONE_MINUS_SRC_ALPHA
182	};
183
184	void setOperand0_RGB(GLint op);
185	void setOperand1_RGB(GLint op);
186	void setOperand2_RGB(GLint op);
187
188	void setOperand0_Alpha(GLint op);
189	void setOperand1_Alpha(GLint op);
190	void setOperand2_Alpha(GLint op);
191
192	GLint getOperand0_RGB() const { return _operand0_RGB; }
193	GLint getOperand1_RGB() const { return _operand1_RGB; }
194	GLint getOperand2_RGB() const { return _operand2_RGB; }
195
196	GLint getOperand0_Alpha() const { return _operand0_Alpha; }
197	GLint getOperand1_Alpha() const { return _operand1_Alpha; }
198	GLint getOperand2_Alpha() const { return _operand2_Alpha; }
199
200
201	void setScale_RGB(float scale);
202	void setScale_Alpha(float scale);
203
204	float getScale_RGB() const { return _scale_RGB; }
205	float getScale_Alpha() const { return _scale_Alpha; }
206
207	void setConstantColor( const Vec4& color ) { _constantColor = color; }
208	const Vec4& getConstantColor() const { return _constantColor; }
209
210	/** Set the constant color attribute to the given light direction
211	* for use with DOT3 combine operation. */
212	void setConstantColorAsLightDirection(const Vec3& direction)
213	{
214	_constantColor.set((direction.x()+1.0f)0.5f,(direction.y()+1.0f)0.5f,(direction.z()+1.0f)*0.5f,1.0f);
215	}
216
217	Vec3 getConstantColorAsLightDirection() const
218	{
219	return Vec3(_constantColor.x()2.0f-1.0f, _constantColor.y()2.0f-1.0f, _constantColor.z()*2.0f-1.0f);
220	}
221
222	virtual void apply(State& state) const;
223
224	protected :
225
226	virtual ~TexEnvCombine();
227
228	inline bool needsTexEnvCombiner(GLint value) const
229	{
230	switch(value)
231	{
232	case(CONSTANT):
233	case(PRIMARY_COLOR):
234	case(PREVIOUS):
235	case(TEXTURE):
236	return false;
237	}
238	return true;
239	}
240
241	void computeNeedForTexEnvCombiners()
242	{
243	_needsTexEnvCrossbar = (needsTexEnvCombiner(_source0_RGB) \|\|
244	needsTexEnvCombiner(_source1_RGB) \|\|
245	needsTexEnvCombiner(_source2_RGB) \|\|
246	needsTexEnvCombiner(_source0_Alpha) \|\|
247	needsTexEnvCombiner(_source1_Alpha) \|\|
248	needsTexEnvCombiner(_source2_Alpha));
249	}
250
251
252
253
254
255	bool _needsTexEnvCrossbar;
256
257	GLint _combine_RGB;
258	GLint _combine_Alpha;
259
260	GLint _source0_RGB;
261	GLint _source1_RGB;
262	GLint _source2_RGB;
263
264	GLint _source0_Alpha;
265	GLint _source1_Alpha;
266	GLint _source2_Alpha;
267
268
269	GLint _operand0_RGB;
270	GLint _operand1_RGB;
271	GLint _operand2_RGB;
272
273	GLint _operand0_Alpha;
274	GLint _operand1_Alpha;
275	GLint _operand2_Alpha;
276
277
278	float _scale_RGB;
279	float _scale_Alpha;
280
281	osg::Vec4 _constantColor;
282
283	};
284
285	}
286
287	#endif

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