From 3b21507274aa4f98644382903ae529c1fc2c7bd4 Mon Sep 17 00:00:00 2001
From: inmarket <andrewh@inmarket.com.au>
Date: Wed, 20 Aug 2014 01:36:33 +1000
Subject: GL3D GWIN window + demo

---
 3rdparty/tinygl-0.4-ugfx/src/nglx.c | 128 ++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 3rdparty/tinygl-0.4-ugfx/src/nglx.c

(limited to '3rdparty/tinygl-0.4-ugfx/src/nglx.c')

diff --git a/3rdparty/tinygl-0.4-ugfx/src/nglx.c b/3rdparty/tinygl-0.4-ugfx/src/nglx.c
new file mode 100644
index 00000000..26f356c2
--- /dev/null
+++ b/3rdparty/tinygl-0.4-ugfx/src/nglx.c
@@ -0,0 +1,128 @@
+/* simple glx like driver for TinyGL and Nano X */
+#include <GL/gl.h>
+#include <GL/nglx.h>
+#include <microwin/nano-X.h>
+#include "zgl.h"
+
+typedef struct {
+    GLContext *gl_context;
+    int xsize,ysize;
+    GR_DRAW_ID drawable;
+    GR_GC_ID gc;
+    int pixtype; /* pixel type in TinyGL */
+} TinyNGLXContext;
+
+NGLXContext nglXCreateContext(NGLXContext shareList, int flags)
+{
+  TinyNGLXContext *ctx;
+
+  if (shareList != NULL) {
+    gl_fatal_error("No sharing available in TinyGL");
+  }
+  ctx=gl_malloc(sizeof(TinyNGLXContext));
+  if (!ctx)
+      return NULL;
+  ctx->gl_context=NULL;
+  return (NGLXContext) ctx;
+}
+
+void glXDestroyContext( NGLXContext ctx1 )
+{
+  TinyNGLXContext *ctx = (TinyNGLXContext *) ctx1;
+  if (ctx->gl_context != NULL) {
+    glClose();
+  }
+  gl_free(ctx);
+}
+
+
+/* resize the glx viewport : we try to use the xsize and ysize
+   given. We return the effective size which is guaranted to be smaller */
+
+static int glX_resize_viewport(GLContext *c,int *xsize_ptr,int *ysize_ptr)
+{
+  TinyNGLXContext *ctx;
+  int xsize,ysize;
+  
+  ctx=(TinyNGLXContext *)c->opaque;
+
+  xsize=*xsize_ptr;
+  ysize=*ysize_ptr;
+
+  /* we ensure that xsize and ysize are multiples of 2 for the zbuffer. 
+     TODO: find a better solution */
+  xsize&=~3;
+  ysize&=~3;
+
+  if (xsize == 0 || ysize == 0) return -1;
+
+  *xsize_ptr=xsize;
+  *ysize_ptr=ysize;
+
+  ctx->xsize=xsize;
+  ctx->ysize=ysize;
+
+  /* resize the Z buffer */
+  ZB_resize(c->zb,NULL,xsize,ysize);
+  return 0;
+}
+
+/* we assume here that drawable is a window */
+int nglXMakeCurrent( NGLXDrawable drawable,
+                     NGLXContext ctx1)
+{
+  TinyNGLXContext *ctx = (TinyNGLXContext *) ctx1;
+  int mode, xsize, ysize;
+  ZBuffer *zb;
+  GR_WINDOW_INFO win_info;
+
+  if (ctx->gl_context == NULL) {
+      /* create the TinyGL context */
+      GrGetWindowInfo(drawable, &win_info);
+
+      xsize = win_info.width;
+      ysize = win_info.height;
+
+      /* currently, we only support 16 bit rendering */
+      mode = ZB_MODE_5R6G5B;
+      zb=ZB_open(xsize,ysize,mode,0,NULL,NULL,NULL);
+      if (zb == NULL) {
+          fprintf(stderr, "Error while initializing Z buffer\n");
+          exit(1);
+      }
+
+      ctx->pixtype = MWPF_TRUECOLOR565;
+
+      /* create a gc */
+      ctx->gc = GrNewGC();
+      
+      /* initialisation of the TinyGL interpreter */
+      glInit(zb);
+      ctx->gl_context=gl_get_context();
+      ctx->gl_context->opaque=(void *) ctx;
+      ctx->gl_context->gl_resize_viewport=glX_resize_viewport;
+
+      /* set the viewport : we force a call to glX_resize_viewport */
+      ctx->gl_context->viewport.xsize=-1;
+      ctx->gl_context->viewport.ysize=-1;
+      
+      glViewport(0, 0, xsize, ysize);
+  }
+  
+  return 1;
+}
+
+void nglXSwapBuffers( NGLXDrawable drawable )
+{
+    GLContext *gl_context;
+    TinyNGLXContext *ctx;
+    
+    /* retrieve the current NGLXContext */
+    gl_context=gl_get_context();
+    ctx=(TinyNGLXContext *)gl_context->opaque;
+    
+    GrArea(drawable, ctx->gc, 0, 0, ctx->xsize, 
+           ctx->ysize, ctx->gl_context->zb->pbuf, ctx->pixtype);
+}
+
+
-- 
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