workbench/libs/gl/gla.h

   1 /*
   2     Copyright 2014, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6
   7 #ifndef GLA_H
   8 #define GLA_H
   9
  10 #ifdef __cplusplus
  11 extern "C" {
  12 #endif
  13
  14 #include <intuition/intuition.h>
  15 #include <GL/gl.h>
  16
  17 #ifndef UTILITY_TAGITEM_H
  18 #include <utility/tagitem.h>
  19 #endif
  20
  21 enum GLAError
  22 {
  23    GLA_OUT_OF_MEM = 1,
  24    GLA_RASTPORT_TAG_MISSING,
  25    GLA_SCREEN_TAG_MISSING,
  26    GLA_WINDOW_TAG_MISSING
  27 };
  28
  29 /*
  30  * This is the GLA context. This is an opaque pointer.
  31  * All information is hidden away from user.
  32  */
  33
  34
  35 typedef APTR GLAContext;
  36
  37 /*
  38  * GLA Attribute tag ID's.  These are used in the ti_Tag field of
  39  * TagItem arrays passed to glACreateContext()
  40  */
  41 #define GLA_Dummy               (TAG_USER + 32)
  42
  43 /*
  44  * Offsets from rastport layer dimensions.
  45  * Typically GLA_Left = window->BorderLeft, GLA_Top = window->BorderTop
  46  * Defaults: if rendering to non-GZZ window BorderLeft, BorderTop, in all other
  47  *           cases 0,0
  48  */
  49 #define GLA_Left                (GLA_Dummy + 0x0002)
  50 #define GLA_Right               (GLA_Dummy + 0x0003)
  51 #define GLA_Top                 (GLA_Dummy + 0x0004)
  52 #define GLA_Bottom              (GLA_Dummy + 0x0005)
  53
  54 /*
  55  * Size in pixel of requested drawing area. Used to calculate GLA_Right, GLA_Bottom
  56  * if they are not passed. No defaults. Size of render area is calculated using:
  57  * rastport layer width - left - right, rastport layer height - top - bottom
  58  */
  59 #define GLA_Width               (GLA_Dummy + 0x0006)
  60 #define GLA_Height              (GLA_Dummy + 0x0007)
  61
  62 /*
  63  * Target to which rendering will be done. Currently always pass GLA_Window
  64  */
  65 #define GLA_Screen              (GLA_Dummy + 0x0011)
  66 #define GLA_Window              (GLA_Dummy + 0x0012)
  67 #define GLA_RastPort            (GLA_Dummy + 0x0013)
  68
  69 /*
  70  * Following boolean flags are ignored and always considered GL_TRUE
  71  */
  72 #define GLA_DoubleBuf           (GLA_Dummy + 0x0030)
  73 #define GLA_RGBMode             (GLA_Dummy + 0x0031)
  74 #define GLA_AlphaFlag           (GLA_Dummy + 0x0032)
  75
  76 /*
  77  * GLA_NoDepth:    don't allocate ZBuffer if GL_TRUE, default is GL_FALSE
  78  * GLA_NoStencil:  don't allocate StencilBuffer if GL_TRUE, default is GL_FALSE
  79  * GLA_NoAccum:    don't allocate AccumulationBuffer if GL_TRUE, default is GL_FALSE
  80  */
  81 #define GLA_NoDepth             (GLA_Dummy + 0x0039)
  82 #define GLA_NoStencil           (GLA_Dummy + 0x003a)
  83 #define GLA_NoAccum             (GLA_Dummy + 0x003b)
  84
  85 /*
  86  * GLA API calls
  87  */
  88
  89 typedef void (*GLAProc)();
  90
  91 GLAPI GLAContext            GLAPIENTRY glACreateContextTags(Tag Tag1, ...);
  92 GLAPI GLAContext            GLAPIENTRY glACreateContext(struct TagItem *tagList);
  93 GLAPI void                  GLAPIENTRY glADestroyContext(GLAContext ctx);
  94 GLAPI void                  GLAPIENTRY glAMakeCurrent(GLAContext ctx);
  95 GLAPI void                  GLAPIENTRY glASwapBuffers(GLAContext ctx);
  96 GLAPI GLAProc               GLAPIENTRY glAGetProcAddress(const GLubyte * procname);
  97 GLAPI GLAContext            GLAPIENTRY glAGetCurrentContext();
  98 GLAPI void                  GLAPIENTRY glASetRast(GLAContext ctx, struct TagItem *tagList);
  99 GLAPI void                  GLAPIENTRY glAGetConfig(GLAContext ctx, GLenum pname, GLint* params);
 100
 101 #ifdef __cplusplus
 102 }
 103 #endif
 104
 105 #endif /* GLA_H */