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

   1
   2 #include "mtypes.h"
   3 #include "drirenderbuffer.h"
   4 #include "renderbuffer.h"
   5 #include "imports.h"
   6
   7
   8 /**
   9  * This will get called when a window is resized.
  10  * Just update width, height and internal format fields for now.
  11  */
  12 static GLboolean
  13 driRenderbufferStorage(GLcontext *ctx, struct gl_renderbuffer *rb,
  14                        GLenum internalFormat, GLuint width, GLuint height)
  15 {
  16    rb->Width = width;
  17    rb->Height = height;
  18    rb->InternalFormat = internalFormat;
  19    return GL_TRUE;
  20 }
  21
  22
  23 /**
  24  * Allocate a new driRenderbuffer object.
  25  * Individual drivers are free to implement different versions of
  26  * this function.
  27  * \param format  Either GL_RGBA, GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24,
  28  *                GL_DEPTH_COMPONENT32, or GL_STENCIL_INDEX8_EXT (for now).
  29  * \param cpp  chars or bytes per pixel
  30  * \param offset  start of buffer with respect to framebuffer address
  31  * \param pitch   pixels per row
  32  */
  33 driRenderbuffer *
  34 driNewRenderbuffer(GLenum format, GLint cpp, GLint offset, GLint pitch)
  35 {
  36    driRenderbuffer *drb;
  37
  38    assert(format == GL_RGBA ||
  39           format == GL_DEPTH_COMPONENT16 ||
  40           format == GL_DEPTH_COMPONENT24 ||
  41           format == GL_DEPTH_COMPONENT32 ||
  42           format == GL_STENCIL_INDEX8_EXT);
  43
  44    assert(cpp > 0);
  45    assert(pitch > 0);
  46
  47    drb = _mesa_calloc(sizeof(driRenderbuffer));
  48    if (drb) {
  49       const GLuint name = 0;
  50
  51       _mesa_init_renderbuffer(&drb->Base, name);
  52
  53       /* Make sure we're using a null-valued GetPointer routine */
  54       assert(drb->Base.GetPointer(NULL, &drb->Base, 0, 0) == NULL);
  55
  56       drb->Base.InternalFormat = format;
  57
  58       if (format == GL_RGBA) {
  59          /* Color */
  60          drb->Base._BaseFormat = GL_RGBA;
  61          drb->Base.DataType = GL_UNSIGNED_BYTE;
  62       }
  63       else if (format == GL_DEPTH_COMPONENT16) {
  64          /* Depth */
  65          drb->Base._BaseFormat = GL_DEPTH_COMPONENT;
  66          /* we always Get/Put 32-bit Z values */
  67          drb->Base.DataType = GL_UNSIGNED_INT;
  68       }
  69       else if (format == GL_DEPTH_COMPONENT24) {
  70          /* Depth */
  71          drb->Base._BaseFormat = GL_DEPTH_COMPONENT;
  72          /* we always Get/Put 32-bit Z values */
  73          drb->Base.DataType = GL_UNSIGNED_INT;
  74       }
  75       else {
  76          /* Stencil */
  77          ASSERT(format == GL_STENCIL_INDEX8);
  78          drb->Base._BaseFormat = GL_STENCIL_INDEX;
  79          drb->Base.DataType = GL_UNSIGNED_BYTE;
  80       }
  81
  82       /* XXX if we were allocating a user-created renderbuffer, we'd have
  83        * to fill in the ComponentSizes[] array too.
  84        */
  85
  86       drb->Base.AllocStorage = driRenderbufferStorage;
  87       /* using default Delete function */
  88
  89
  90       /* DRI renderbuffer-specific fields: */
  91       drb->offset = offset;
  92       drb->pitch = pitch;
  93       drb->cpp = cpp;
  94    }
  95    return drb;
  96 }