From e4b2356c07d31fbeeabb13b2fb47db703b473080 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Wed, 4 May 2005 20:11:35 +0000
Subject: Major check-in of changes for GL_EXT_framebuffer_object extension.
 Main driver impacts: - new code for creating the Mesa GLframebuffer - new
 span/pixel read/write code Some drivers not yet updated/tested.

---
 src/mesa/drivers/dri/common/drirenderbuffer.c | 96 +++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/mesa/drivers/dri/common/drirenderbuffer.c

(limited to 'src/mesa/drivers/dri/common/drirenderbuffer.c')

diff --git a/src/mesa/drivers/dri/common/drirenderbuffer.c b/src/mesa/drivers/dri/common/drirenderbuffer.c
new file mode 100644
index 00000000000..3d9574f0cf2
--- /dev/null
+++ b/src/mesa/drivers/dri/common/drirenderbuffer.c
@@ -0,0 +1,96 @@
+
+#include "mtypes.h"
+#include "drirenderbuffer.h"
+#include "renderbuffer.h"
+#include "imports.h"
+
+
+/**
+ * This will get called when a window is resized.
+ * Just update width, height and internal format fields for now.
+ */
+static GLboolean
+driRenderbufferStorage(GLcontext *ctx, struct gl_renderbuffer *rb,
+                       GLenum internalFormat, GLuint width, GLuint height)
+{
+   rb->Width = width;
+   rb->Height = height;
+   rb->InternalFormat = internalFormat;
+   return GL_TRUE;
+}
+
+
+/**
+ * Allocate a new driRenderbuffer object.
+ * Individual drivers are free to implement different versions of
+ * this function.
+ * \param format  Either GL_RGBA, GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24,
+ *                GL_DEPTH_COMPONENT32, or GL_STENCIL_INDEX8_EXT (for now).
+ * \param cpp  chars or bytes per pixel
+ * \param offset  start of buffer with respect to framebuffer address
+ * \param pitch   pixels per row
+ */
+driRenderbuffer *
+driNewRenderbuffer(GLenum format, GLint cpp, GLint offset, GLint pitch)
+{
+   driRenderbuffer *drb;
+
+   assert(format == GL_RGBA ||
+          format == GL_DEPTH_COMPONENT16 ||
+          format == GL_DEPTH_COMPONENT24 ||
+          format == GL_DEPTH_COMPONENT32 ||
+          format == GL_STENCIL_INDEX8_EXT);
+
+   assert(cpp > 0);
+   assert(pitch > 0);
+
+   drb = _mesa_calloc(sizeof(driRenderbuffer));
+   if (drb) {
+      const GLuint name = 0;
+
+      _mesa_init_renderbuffer(&drb->Base, name);
+
+      /* Make sure we're using a null-valued GetPointer routine */
+      assert(drb->Base.GetPointer(NULL, &drb->Base, 0, 0) == NULL);
+
+      drb->Base.InternalFormat = format;
+
+      if (format == GL_RGBA) {
+         /* Color */
+         drb->Base._BaseFormat = GL_RGBA;
+         drb->Base.DataType = GL_UNSIGNED_BYTE;
+      }
+      else if (format == GL_DEPTH_COMPONENT16) {
+         /* Depth */
+         drb->Base._BaseFormat = GL_DEPTH_COMPONENT;
+         /* we always Get/Put 32-bit Z values */
+         drb->Base.DataType = GL_UNSIGNED_INT;
+      }
+      else if (format == GL_DEPTH_COMPONENT24) {
+         /* Depth */
+         drb->Base._BaseFormat = GL_DEPTH_COMPONENT;
+         /* we always Get/Put 32-bit Z values */
+         drb->Base.DataType = GL_UNSIGNED_INT;
+      }
+      else {
+         /* Stencil */
+         ASSERT(format == GL_STENCIL_INDEX8);
+         drb->Base._BaseFormat = GL_STENCIL_INDEX;
+         drb->Base.DataType = GL_UNSIGNED_BYTE;
+      }
+
+      /* XXX if we were allocating a user-created renderbuffer, we'd have
+       * to fill in the ComponentSizes[] array too.
+       */
+
+      drb->Base.AllocStorage = driRenderbufferStorage;
+      /* using default Delete function */
+
+
+      /* DRI renderbuffer-specific fields: */
+      drb->offset = offset;
+      drb->pitch = pitch;
+      drb->cpp = cpp;
+   }
+   return drb;
+}
-- 
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