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 "mtypes.h"
  14 #include "dri_util.h"
  15
  16
  17 typedef struct {
  18    struct gl_renderbuffer Base;
  19
  20    /* Chars or bytes per pixel.  If Z and Stencil are stored together this
  21     * will typically be 32 whether this a depth or stencil renderbuffer.
  22     */
  23    GLint cpp;
  24
  25    /* Buffer position and pitch (row stride).  Recall that for today's DRI
  26     * drivers, we have statically allocated color/depth/stencil buffers.
  27     * So this information describes the whole screen, not just a window.
  28     * To address pixels in a window, we need to know the window's position
  29     * and size with respect to the screen.
  30     */
  31    GLint offset;  /* in bytes */
  32    GLint pitch;   /* in pixels */
  33
  34    /* If the driver can do page flipping (full-screen double buffering)
  35     * the current front/back buffers may get swapped.
  36     * If page flipping is disabled, these  fields will be identical to
  37     * the offset/pitch/Data above.
  38     * If page flipping is enabled, and this is the front(back) renderbuffer,
  39     * flippedOffset/Pitch/Data will have the back(front) renderbuffer's values.
  40     */
  41    GLint flippedOffset;
  42    GLint flippedPitch;
  43    GLvoid *flippedData;  /* mmap'd address of buffer memory, if used */
  44
  45    /* Pointer to corresponding __DRIdrawablePrivate.  This is used to compute
  46     * the window's position within the framebuffer.
  47     */
  48    __DRIdrawablePrivate *dPriv;
  49
  50    /* XXX this is for radeon/r200 only.  We should really create a new
  51     * r200Renderbuffer class, derived from this class...  not a huge deal.
  52     */
  53    GLboolean depthHasSurface;
  54
  55    /* XXX this is for s3v only.  A handy flag to know if this is the back
  56     * color buffer.
  57     */
  58    GLboolean backBuffer;
  59 } driRenderbuffer;
  60
  61
  62 extern driRenderbuffer *
  63 driNewRenderbuffer(GLenum format, GLvoid *addr,
  64                    GLint cpp, GLint offset, GLint pitch,
  65                    __DRIdrawablePrivate *dPriv);
  66
  67 extern void
  68 driFlipRenderbuffers(struct gl_framebuffer *fb, GLboolean flipped);
  69
  70 #endif /* DRIRENDERBUFFER_H */