1 files changed, 75 insertions, 0 deletions
diff --git a/generator/pamtris/framebuffer.h b/generator/pamtris/framebuffer.h
new file mode 100644
index 00000000..b3d4f7a3
--- /dev/null
+++ b/generator/pamtris/framebuffer.h
@@ -0,0 +1,75 @@
+#ifndef FRAMEBUFFER_H_INCLUDED
+#define FRAMEBUFFER_H_INCLUDED
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "varying.h"
+#include "netpbm/pam.h"
+
+typedef struct framebuffer_info {
+/*----------------------------------------------------------------------------
+   Information about the frame buffer and PAM output
+-----------------------------------------------------------------------------*/
+    /* These fields are initialized once by reading the command line
+       arguments. "maxval" and "num_attribs" may be modified later
+       through "realloc_image_buffer"; "correct" may also be modified
+       if the eponymous command is given.
+    */
+    int32_t width;
+    int32_t height;
+    int32_t maxval;
+    int32_t num_attribs;
+
+    /* The fields below must be initialized by "init_framebuffer" and
+       freed by "free_framebuffer", except for the tuple_type field in
+       "outpam" which is initialized once by reading the command line
+       arguments and may be modified later through "set_tupletype".
+    */
+    struct {
+        uint16_t * buffer;
+        uint32_t   bytes;
+    } img; /* Image buffer */
+
+    struct {
+        uint32_t * buffer;
+        uint32_t   bytes;
+    } z;  /* Z-buffer */
+
+    struct pam outpam;
+
+    tuple * pamrow;
+} framebuffer_info;
+
+
+
+int
+set_tupletype(const char * const str,
+              char *       const tupletype);
+
+int
+init_framebuffer(framebuffer_info * const fbi);
+
+void
+free_framebuffer(framebuffer_info * const fbi);
+
+void
+print_framebuffer(framebuffer_info * const fbi);
+
+void
+clear_framebuffer(bool               const clear_image_buffer,
+                  bool               const clear_z_buffer,
+                  framebuffer_info * const fbi);
+
+int
+realloc_image_buffer(int32_t            const new_maxval,
+                     int32_t            const new_num_attribs,
+                     framebuffer_info * const fbi);
+
+void
+draw_span(uint32_t           const base,
+          uint16_t           const length,
+          varying *          const attribs,
+          framebuffer_info * const fbi);
+
+#endif