OpenGL 4.2 (Compatibility Profile) - April 27, 2012

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4.4. FRAMEBUFFER OBJECTS 428 4.3.4 Pixel Draw/Read State The state required for pixel operations consists of the parameters that are set with PixelStore, PixelTransfer, and PixelMap. This state has been summarized in tables 3.1, 3.2, and 3.3. Additional state includes the current raster position (section 2.25) an integer indicating the current setting of ReadBuffer, and a three-valued integer controlling clamping during final conversion. For the default framebuffer, in the initial state the read buffer is BACK if there is a back buffer; FRONT if there is no back buffer; and NONE if no default framebuffer is associated with the context. The initial value of read color clamping is FIXED_ONLY. State set with PixelStore is GL client state. 4.4 Framebuffer Objects As described in chapter 1 and section 2.1, the GL renders into (and reads values from) a framebuffer. There are two classes of framebuffers: window systemprovided and application-created. Initially, the GL uses the default framebuffer. The storage, dimensions, allocation, and format of the images attached to this framebuffer are managed entirely by the window system. Consequently, the state of the default framebuffer, including its images, can not be changed by the GL, nor can the default framebuffer be deleted by the GL. The routines described in the following sections, however, can be used to create, destroy, and modify the state and attachments of framebuffer objects. Framebuffer objects encapsulate the state of a framebuffer in a similar manner to the way texture objects encapsulate the state of a texture. In particular, a framebuffer object encapsulates state necessary to describe a collection of color, depth, and stencil logical buffers (other types of buffers are not allowed). For each logical buffer, a framebuffer-attachable image can be attached to the framebuffer to store the rendered output for that logical buffer. Examples of framebuffer-attachable images include texture images and renderbuffer images. Renderbuffers are described further in section 4.4.2 By allowing the images of a renderbuffer to be attached to a framebuffer, the GL provides a mechanism to support off-screen rendering. Further, by allowing the images of a texture to be attached to a framebuffer, the GL provides a mechanism to support render to texture. OpenGL 4.2 (Compatibility Profile) - April 27, 2012
4.4. FRAMEBUFFER OBJECTS 429 4.4.1 Binding and Managing Framebuffer Objects The default framebuffer for rendering and readback operations is provided by the window system. In addition, named framebuffer objects can be created and operated upon. The name space for framebuffer objects is the unsigned integers, with zero reserved by the GL for the default framebuffer. A framebuffer object is created by binding a name returned by GenFramebuffers (see below) to DRAW_FRAMEBUFFER or READ_FRAMEBUFFER. The binding is effected by calling void BindFramebuffer( enum target, uint framebuffer ); with target set to the desired framebuffer target and framebuffer set to the framebuffer object name. The resulting framebuffer object is a new state vector, comprising all the state and with the same initial values listed in table 6.33, as well as one set of the state values listed in table 6.34 for each attachment point of the framebuffer, with the same initial values. There are the value of MAX_COLOR_- ATTACHMENTS color attachment points, plus one each for the depth and stencil attachment points. BindFramebuffer may also be used to bind an existing framebuffer object to DRAW_FRAMEBUFFER and/or READ_FRAMEBUFFER. If the bind is successful no change is made to the state of the newly bound framebuffer object, and any previous binding to target is broken. BindFramebuffer fails and an INVALID_OPERATION error is generated if framebuffer is not zero or a name returned from a previous call to GenFramebuffers, or if such a name has since been deleted with DeleteFramebuffers. If a framebuffer object is bound to DRAW_FRAMEBUFFER or READ_- FRAMEBUFFER, it becomes the target for rendering or readback operations, respectively, until it is deleted or another framebuffer object is bound to the corresponding bind point. Calling BindFramebuffer with target set to FRAMEBUFFER binds framebuffer to both the draw and read targets. While a framebuffer object is bound, GL operations on the target to which it is bound affect the images attached to the bound framebuffer object, and queries of the target to which it is bound return state from the bound object. Queries of the values specified in tables 6.77 and 6.33 are derived from the framebuffer object bound to DRAW_FRAMEBUFFER, with the exception of those marked as properties of the read framebuffer, which are derived from the framebuffer object bound to READ_FRAMEBUFFER. The initial state of DRAW_FRAMEBUFFER and READ_FRAMEBUFFER refers to the default framebuffer. In order that access to the default framebuffer is not lost, it is treated as a framebuffer object with the name of zero. The default framebuffer OpenGL 4.2 (Compatibility Profile) - April 27, 2012
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The OpenGL R○ Graphics System: A
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Contents 1 Introduction 1 1.1 Forma
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CONTENTS iii 2.14.14 Required State
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CONTENTS v 3.11 Color Sum . . . . .
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CONTENTS vii A Invariance 588 A.1 R
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CONTENTS ix L Version 4.2 659 L.1 N
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CONTENTS xi M.3.70 BPTC texture com
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LIST OF FIGURES xiii 3.11 Example o
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LIST OF TABLES xv 3.10 UNSIGNED_SHO
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LIST OF TABLES xvii 6.29 Pixel Oper
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Chapter 1 Introduction This documen
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1.5. OUR VIEW 3 the CPU and the gra
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Chapter 2 OpenGL Operation 2.1 Open
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2.1. OPENGL FUNDAMENTALS 7 section
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2.1. OPENGL FUNDAMENTALS 9 must not
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2.1. OPENGL FUNDAMENTALS 11 2.1.2 F
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2.3. GL COMMAND SYNTAX 13 describe
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2.3. GL COMMAND SYNTAX 15 indicates
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2.4. BASIC GL OPERATION 17 Transfor
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2.6. BEGIN/END PARADIGM 19 To allow
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2.6. BEGIN/END PARADIGM 21 Vertex C
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2.6. BEGIN/END PARADIGM 23 2.6.1 Be
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2.6. BEGIN/END PARADIGM 25 vertex A
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2.6. BEGIN/END PARADIGM 27 Figure 2
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2.6. BEGIN/END PARADIGM 29 Primitiv
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2.7. VERTEX SPECIFICATION 31 that i
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2.7. VERTEX SPECIFICATION 33 The Te
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2.7. VERTEX SPECIFICATION 35 The Co
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2.7. VERTEX SPECIFICATION 37 When v
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2.8. VERTEX ARRAYS 39 indicates the
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2.8. VERTEX ARRAYS 41 integer value
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2.8. VERTEX ARRAYS 43 does not exis
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2.8. VERTEX ARRAYS 45 and void Enab
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2.8. VERTEX ARRAYS 47 array is enab
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2.8. VERTEX ARRAYS 49 if (mode or p
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2.8. VERTEX ARRAYS 51 The command v
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2.8. VERTEX ARRAYS 53 if (no elemen
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2.8. VERTEX ARRAYS 55 format e t e
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2.9. BUFFER OBJECTS 57 Target name
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2.9. BUFFER OBJECTS 59 Each target
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2.9. BUFFER OBJECTS 61 Name Value B
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2.9. BUFFER OBJECTS 63 Name Value B
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2.9. BUFFER OBJECTS 65 FlushMappedB
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2.9. BUFFER OBJECTS 67 that GL impl
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2.10. VERTEX ARRAY OBJECTS 69 2.10
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2.12. FIXED-FUNCTION VERTEX TRANSFO
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2.13. FIXED-FUNCTION VERTEX LIGHTIN
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2.14. VERTEX SHADERS 93 shader, its
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2.14. VERTEX SHADERS 95 If shader i
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2.14. VERTEX SHADERS 97 • One or
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2.14. VERTEX SHADERS 99 any stage.
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2.14. VERTEX SHADERS 101 2.14.4 Pro
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2.14. VERTEX SHADERS 103 been previ
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2.14. VERTEX SHADERS 105 • For ea
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2.14. VERTEX SHADERS 107 • Six un
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2.14. VERTEX SHADERS 109 gram execu
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2.14. VERTEX SHADERS 111 values are
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2.14. VERTEX SHADERS 113 Built-in a
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2.14. VERTEX SHADERS 115 When a pro
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2.14. VERTEX SHADERS 117 void GetAc
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2.14. VERTEX SHADERS 119 bufferInde
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2.14. VERTEX SHADERS 121 program is
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2.14. VERTEX SHADERS 123 OpenGL Sha
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2.14. VERTEX SHADERS 125 OpenGL Sha
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2.14. VERTEX SHADERS 127 ments in t
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2.14. VERTEX SHADERS 129 The Unifor
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2.14. VERTEX SHADERS 131 void Progr
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2.14. VERTEX SHADERS 133 • Arrays
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2.14. VERTEX SHADERS 135 with targe
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2.14. VERTEX SHADERS 137 Each of a
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2.14. VERTEX SHADERS 139 is returne
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2.14. VERTEX SHADERS 141 2.14.10 Im
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2.14. VERTEX SHADERS 143 void Trans
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2.14. VERTEX SHADERS 145 INVALID_OP
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2.14. VERTEX SHADERS 147 The follow
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2.14. VERTEX SHADERS 149 Texture Si
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2.14. VERTEX SHADERS 151 dent const
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2.14. VERTEX SHADERS 153 as describ
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2.14. VERTEX SHADERS 155 Separable
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2.14. VERTEX SHADERS 157 invocation
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2.14. VERTEX SHADERS 159 • COMMAN
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2.14. VERTEX SHADERS 161 • Data w
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2.15. TESSELLATION 163 2.15 Tessell
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2.15. TESSELLATION 165 Tessellation
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2.15. TESSELLATION 167 Similarly to
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2.15. TESSELLATION 169 nent count.
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2.15. TESSELLATION 171 Figure 2.13.
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2.15. TESSELLATION 173 along each t
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2.15. TESSELLATION 175 ermost inner
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2.15. TESSELLATION 181 variables th
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2.15. TESSELLATION 183 Additionally
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2.16. GEOMETRY SHADERS 185 executed
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2.16. GEOMETRY SHADERS 187 forms an
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2.16. GEOMETRY SHADERS 189 subseque
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2.16. GEOMETRY SHADERS 191 The Open
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2.16. GEOMETRY SHADERS 193 rays. Th
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2.17. COORDINATE TRANSFORMATIONS 19
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2.18. ASYNCHRONOUS QUERIES 197 The
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2.18. ASYNCHRONOUS QUERIES 199 the
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2.20. TRANSFORM FEEDBACK 201 the GL
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2.20. TRANSFORM FEEDBACK 203 object
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2.20. TRANSFORM FEEDBACK 205 the ge
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2.20. TRANSFORM FEEDBACK 207 and th
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2.22. FLATSHADING 209 stream index
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2.23. PRIMITIVE CLIPPING 211 void S
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2.23. PRIMITIVE CLIPPING 213 If the
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2.25. CURRENT RASTER POSITION 215 I
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2.25. CURRENT RASTER POSITION 217 R
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Chapter 3 Rasterization Rasterizati
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3.1. DISCARDING PRIMITIVES BEFORE R
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3.3. ANTIALIASING 223 3. The sum of
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3.4. POINTS 225 any other variables
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3.4. POINTS 227 and the fade factor
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¡ ¡ ¡ ¡ ¡ ¡ 3.4. POINTS 229 5
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3.4. POINTS 231 All fragments produ
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3.5. LINE SEGMENTS 233 3.5 Line Seg
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3.5. LINE SEGMENTS 235 top or both
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3.5. LINE SEGMENTS 237 width = 2 wi
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3.6. POLYGONS 239 In addition, duri
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3.6. POLYGONS 241 such a case we re
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3.6. POLYGONS 243 3.6.3 Antialiasin
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3.6. POLYGONS 245 The offset value
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3.7. PIXEL RECTANGLES 247 Parameter
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3.7. PIXEL RECTANGLES 249 Parameter
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3.7. PIXEL RECTANGLES 251 Table Nam
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3.7. PIXEL RECTANGLES 253 width are
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3.7. PIXEL RECTANGLES 255 The red,
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3.7. PIXEL RECTANGLES 257 meanings,
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3.7. PIXEL RECTANGLES 259 the flag.
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3.7. PIXEL RECTANGLES 261 width and
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3.7. PIXEL RECTANGLES 263 Format Na
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3.7. PIXEL RECTANGLES 265 ROW_LENGT
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3.7. PIXEL RECTANGLES 267 UNSIGNED_
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3.7. PIXEL RECTANGLES 269 UNSIGNED_
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3.7. PIXEL RECTANGLES 271 Format Fi
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3.7. PIXEL RECTANGLES 273 void Draw
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3.7. PIXEL RECTANGLES 275 A fragmen
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3.7. PIXEL RECTANGLES 277 Base Inte
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3.7. PIXEL RECTANGLES 279 Base Filt
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3.7. PIXEL RECTANGLES 281 and C c i
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3.7. PIXEL RECTANGLES 283 ALPHA_BIA
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3.8. BITMAPS 285 ignored.) If a par
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3.9. EARLY PER-FRAGMENT TESTS 287 B
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3.10. TEXTURING 289 cube map array
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3.10. TEXTURING 291 returns n previ
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3.10. TEXTURING 293 3.10.2 Sampler
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3.10. TEXTURING 295 An INVALID_ENUM
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3.10. TEXTURING 297 Base Internal F
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3.10. TEXTURING 299 RGB10_A2UI, RGB
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3.10. TEXTURING 301 Sized internal
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3.10. TEXTURING 303 Sized Base A L
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3.10. TEXTURING 305 Compressed Inte
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3.10. TEXTURING 307 for image array
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3.10. TEXTURING 309 When target is
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3.10. TEXTURING 311 3.10.4 Alternat
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3.10. TEXTURING 313 The target argu
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3.10. TEXTURING 315 Counting from z
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3.10. TEXTURING 317 define one-, tw
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3.10. TEXTURING 319 • a, the valu
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3.10. TEXTURING 321 If the target p
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3.10. TEXTURING 323 void TexImage2D
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3.10. TEXTURING 325 When a buffer t
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3.10. TEXTURING 327 void TexParamet
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3.10. TEXTURING 329 Texture paramet
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3.10. TEXTURING 331 When seamless c
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3.10. TEXTURING 333 for a two-dimen
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3.10. TEXTURING 335 and the value r
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3.10. TEXTURING 337 where τ ij is
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3.10. TEXTURING 339 -or- The value
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3.10. TEXTURING 341 The rules for N
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3.10. TEXTURING 343 definition of c
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3.10. TEXTURING 345 height (two- an
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3.10. TEXTURING 347 There is no ima
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3.10. TEXTURING 349 for (i = 0; i <
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3.10. TEXTURING 351 3.10.17 Texture
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3.10. TEXTURING 353 Texture Base Te
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3.10. TEXTURING 355 COMBINE_RGB Tex
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3.10. TEXTURING 357 is 0.0. 3.10.18
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3.10. TEXTURING 359 ferior to conve
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3.10. TEXTURING 361 C f CT 0 CT 1 T
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3.10. TEXTURING 363 ⌊ ⌋ layeror
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3.10. TEXTURING 365 • the type of
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3.10. TEXTURING 367 Supported image
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3.11. COLOR SUM 369 Texel sizes, co
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3.13. FRAGMENT SHADERS 371 f is use
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3.13. FRAGMENT SHADERS 373 The Open
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3.13. FRAGMENT SHADERS 375 • The
Page 397 and 398: 3.13. FRAGMENT SHADERS 377 is defin
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Page 401 and 402: 3.14. ANTIALIASING APPLICATION 381
Page 403 and 404: Chapter 4 Per-Fragment Operations a
Page 405 and 406: 4.1. PER-FRAGMENT OPERATIONS 385 Fr
Page 407 and 408: 4.1. PER-FRAGMENT OPERATIONS 387 st
Page 409 and 410: 4.1. PER-FRAGMENT OPERATIONS 389 pr
Page 411 and 412: 4.1. PER-FRAGMENT OPERATIONS 391 po
Page 413 and 414: 4.1. PER-FRAGMENT OPERATIONS 393 4.
Page 415 and 416: 4.1. PER-FRAGMENT OPERATIONS 395 th
Page 417 and 418: 4.1. PER-FRAGMENT OPERATIONS 397 or
Page 419 and 420: 4.1. PER-FRAGMENT OPERATIONS 399 Ge
Page 421 and 422: 4.1. PER-FRAGMENT OPERATIONS 401 4.
Page 423 and 424: 4.1. PER-FRAGMENT OPERATIONS 403 ab
Page 425 and 426: 4.2. WHOLE FRAMEBUFFER OPERATIONS 4
Page 435 and 436: 4.3. DRAWING, READING, AND COPYING
Page 447: 4.3. DRAWING, READING, AND COPYING
Page 451 and 452: 4.4. FRAMEBUFFER OBJECTS 431 • If
Page 453 and 454: 4.4. FRAMEBUFFER OBJECTS 433 with t
Page 455 and 456: 4.4. FRAMEBUFFER OBJECTS 435 Sized
Page 457 and 458: 4.4. FRAMEBUFFER OBJECTS 437 Attach
Page 459 and 460: 4.4. FRAMEBUFFER OBJECTS 439 operat
Page 461 and 462: 4.4. FRAMEBUFFER OBJECTS 441 Render
Page 463 and 464: 4.4. FRAMEBUFFER OBJECTS 443 4.4.4
Page 465 and 466: 4.4. FRAMEBUFFER OBJECTS 445 • Th
Page 467 and 468: 4.4. FRAMEBUFFER OBJECTS 447 Otherw
Page 469 and 470: 4.4. FRAMEBUFFER OBJECTS 449 corres
Page 471 and 472: 4.4. FRAMEBUFFER OBJECTS 451 When c
Page 473 and 474: 5.1. EVALUATORS 453 target k Values
Page 475 and 476: 5.1. EVALUATORS 455 void EvalCoord{
Page 477 and 478: 5.1. EVALUATORS 457 for i = q 1 to
Page 479 and 480: 5.2. SELECTION 459 LoadName replace
Page 481 and 482: 5.3. FEEDBACK 461 buffer is a point
Page 483 and 484: 5.4. TIMER QUERIES 463 feedback-lis
Page 485 and 486: 5.5. DISPLAY LISTS 465 pointers whi
Page 487 and 488: 5.5. DISPLAY LISTS 467 the effect o
Page 489 and 490: 5.6. FLUSH AND FINISH 469 setting;
Page 491 and 492: 5.7. SYNC OBJECTS AND FENCES 471 vo
Page 493 and 494: 5.8. HINTS 473 See appendix D.2 for
Page 495 and 496: Chapter 6 State and State Requests
Page 497 and 498: 6.1. QUERYING GL STATE 477 that mas
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6.1. QUERYING GL STATE 479 data is
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6.1. QUERYING GL STATE 481 turned s
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6.1. QUERYING GL STATE 483 Base Int
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6.1. QUERYING GL STATE 485 INVALID_
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6.1. QUERYING GL STATE 487 type Nam
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6.1. QUERYING GL STATE 489 If reset
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6.1. QUERYING GL STATE 491 Value CO
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6.1. QUERYING GL STATE 493 For occl
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6.1. QUERYING GL STATE 495 returns
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6.1. QUERYING GL STATE 497 COUNTER_
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6.1. QUERYING GL STATE 499 If pname
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6.1. QUERYING GL STATE 503 of this
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6.1. QUERYING GL STATE 505 void Get
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6.1. QUERYING GL STATE 507 generate
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6.1. QUERYING GL STATE 511 take a b
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6.2. STATE TABLES 513 state variabl
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6.2. STATE TABLES 515 OLD NEW Get v
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6.2. STATE TABLES 517 Get value Typ
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6.2. STATE TABLES 525 Get Command I
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6.2. STATE TABLES 547 Get Command I
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6.2. STATE TABLES 573 Get Command M
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A.2. MULTI-PASS ALGORITHMS 589 A.2
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A.3. INVARIANCE RULES 591 Rule 3 Th
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A.4. TESSELLATION INVARIANCE 593 if
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A.6. WHAT ALL THIS MEANS 595 Becaus
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597 stencil comparison function; it
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Appendix C Compressed Texture Image
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C.1. RGTC COMPRESSED TEXTURE IMAGE
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C.2. BPTC COMPRESSED TEXTURE IMAGE
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D.1. OBJECT DELETION BEHAVIOR 615 m
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D.3. PROPAGATING CHANGES TO OBJECTS
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D.3. PROPAGATING CHANGES TO OBJECTS
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E.1. CORE AND COMPATIBILITY PROFILE
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E.2. DEPRECATED AND REMOVED FEATURE
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E.2. DEPRECATED AND REMOVED FEATURE
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Appendix F Version 3.0 and Before O
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F.3. CHANGED TOKENS 629 New Token N
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F.5. CREDITS AND ACKNOWLEDGEMENTS 6
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F.5. CREDITS AND ACKNOWLEDGEMENTS 6
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G.2. DEPRECATION MODEL 635 state ha
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G.4. CREDITS AND ACKNOWLEDGEMENTS 6
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Appendix H Version 3.2 OpenGL versi
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H.4. CHANGE LOG 641 New Token Name
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H.5. CREDITS AND ACKNOWLEDGEMENTS 6
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H.5. CREDITS AND ACKNOWLEDGEMENTS 6
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I.2. DEPRECATION MODEL 647 ing fact
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I.4. CREDITS AND ACKNOWLEDGEMENTS 6
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J.1. NEW FEATURES 651 • Mechanism
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J.4. CREDITS AND ACKNOWLEDGEMENTS 6
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Appendix K Version 4.1 OpenGL versi
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K.5. CREDITS AND ACKNOWLEDGEMENTS 6
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Appendix L Version 4.2 OpenGL versi
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L.4. CHANGE LOG 661 New Token Name
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L.4. CHANGE LOG 663 GetActiveUnifor
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L.4. CHANGE LOG 665 • Clean up de
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L.4. CHANGE LOG 667 • Minor bugfi
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L.5. CREDITS AND ACKNOWLEDGEMENTS 6
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Appendix M Extension Registry, Head
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M.3. ARB EXTENSIONS 673 M.3.2 be am
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M.3. ARB EXTENSIONS 675 M.3.13 Text
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M.3. ARB EXTENSIONS 677 M.3.28 Open
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M.3. ARB EXTENSIONS 679 The name st
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M.3. ARB EXTENSIONS 681 equivalent
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M.3. ARB EXTENSIONS 683 M.3.59 Seam
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M.3. ARB EXTENSIONS 685 M.3.70 BPTC
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M.3. ARB EXTENSIONS 687 M.3.83 Shad
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M.3. ARB EXTENSIONS 689 M.3.96 Debu
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M.3. ARB EXTENSIONS 691 M.3.108 Sha
Page 713 and 714:
INDEX 693 BUFFERS, 500 ActiveShader
Page 715 and 716:
INDEX 695 BLEND, 351, 354, 394, 400
Page 717 and 718:
INDEX 697 COLOR MATERIAL, 87, 90, 5
Page 719 and 720:
INDEX 699 CopyConvolutionFilter*, 4
Page 721 and 722:
INDEX 701 DOUBLE VEC3, 123 DOUBLE V
Page 723 and 724:
INDEX 703 FLOAT, 39, 44, 54-56, 122
Page 725 and 726:
INDEX 705 GenSamplers, 293-295, 467
Page 727 and 728:
INDEX 707 GetTexLevelParameter, 479
Page 729 and 730:
INDEX 709 GL ARB texture swizzle, 6
Page 731 and 732:
INDEX 711 iimage2DArray, 126 iimage
Page 733 and 734:
INDEX 713 313-315, 317, 318, 321, 3
Page 735 and 736:
INDEX 715 MAP1 TEXTURE COORD 3, 453
Page 737 and 738:
INDEX 717 MAX GEOMETRY UNIFORM - BL
Page 739 and 740:
INDEX 719 GATHER OFFSET, 333, 577 M
Page 741 and 742:
INDEX 721 PIXEL MAP B TO B, 250, 27
Page 743 and 744:
INDEX 723 PROXY POST COLOR MATRIX -
Page 745 and 746:
INDEX 725 rg16 snorm, 366 RG16F, 29
Page 747 and 748:
INDEX 727 SamplerParameterI{i ui}v,
Page 749 and 750:
INDEX 729 T, 78, 478 T2F C3F V3F, 5
Page 751 and 752:
INDEX 731 TEXTURE COORD ARRAY - POI
Page 753 and 754:
INDEX 733 PAUSED, 565, 661, 662 TRA
Page 755 and 756:
INDEX 735 UNPACK SKIP PIXELS, 247,
Page 757 and 758:
INDEX 737 VERTEX ATTRIB ARRAY NOR-
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OpenGL 4.2 (Compatibility Profile) - April 27, 2012

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