src/mesa/drivers/dri/common/drirenderbuffer.h

   1
   2 /**
   3  * A driRenderbuffer is dervied from gl_renderbuffer.
   4  * It describes a color buffer (front or back), a depth buffer, or stencil
   5  * buffer etc.
   6  * Specific to DRI drivers are the offset and pitch fields.
   7  */
   8
   9
  10 #ifndef DRIRENDERBUFFER_H
  11 #define DRIRENDERBUFFER_H
  12
  13 #include "main/mtypes.h"
  14 #include "main/formats.h"
  15 #include "dri_util.h"
  16
  17
  18 typedef struct {
  19    struct gl_renderbuffer Base;
  20
  21    /* Chars or bytes per pixel.  If Z and Stencil are stored together this
  22     * will typically be 32 whether this a depth or stencil renderbuffer.
  23     */
  24    GLint cpp;
  25
  26    /* Buffer position and pitch (row stride).  Recall that for today's DRI
  27     * drivers, we have statically allocated color/depth/stencil buffers.
  28     * So this information describes the whole screen, not just a window.
  29     * To address pixels in a window, we need to know the window's position
  30     * and size with respect to the screen.
  31     */
  32    GLint offset;  /* in bytes */
  33    GLint pitch;   /* in pixels */
  34
  35    /* If the driver can do page flipping (full-screen double buffering)
  36     * the current front/back buffers may get swapped.
  37     * If page flipping is disabled, these  fields will be identical to
  38     * the offset/pitch/Data above.
  39     * If page flipping is enabled, and this is the front(back) renderbuffer,
  40     * flippedOffset/Pitch/Data will have the back(front) renderbuffer's values.
  41     */
  42    GLint flippedOffset;
  43    GLint flippedPitch;
  44    GLvoid *flippedData;  /* mmap'd address of buffer memory, if used */
  45
  46    /* Pointer to corresponding __DRIdrawablePrivate.  This is used to compute
  47     * the window's position within the framebuffer.
  48     */
  49    __DRIdrawablePrivate *dPriv;
  50
  51    /* XXX this is for radeon/r200 only.  We should really create a new
  52     * r200Renderbuffer class, derived from this class...  not a huge deal.
  53     */
  54    GLboolean depthHasSurface;
  55
  56    /**
  57     * A handy flag to know if this is the back color buffer.
  58     *
  59     * \note
  60     * This is currently only used by tdfx.
  61     */
  62    GLboolean backBuffer;
  63 } driRenderbuffer;
  64
  65
  66 extern driRenderbuffer *
  67 driNewRenderbuffer(gl_format format, GLvoid *addr,
  68                    GLint cpp, GLint offset, GLint pitch,
  69                    __DRIdrawablePrivate *dPriv);
  70
  71 extern void
  72 driFlipRenderbuffers(struct gl_framebuffer *fb, GLboolean flipped);
  73
  74
  75 extern void
  76 driUpdateFramebufferSize(GLcontext *ctx, const __DRIdrawablePrivate *dPriv);
  77
  78
  79 #endif /* DRIRENDERBUFFER_H */