From 38af3c363f39b393fe466510f2d1c2de8cde0beb Mon Sep 17 00:00:00 2001
From: Sylvain Beucler <beuc@beuc.net>
Date: Sat, 31 Mar 2012 20:03:01 +0000
Subject: [PATCH] fg_geometry: sphere: GL_UNSIGNED_INT->GL_UNSIGNED_SHORT for
 OpenGL ES 1.0 support

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@1219 7f0cb862-5218-0410-a997-914c9d46530a
---
 include/GL/freeglut_std.h |    4 ++--
 src/fg_geometry.c         |   35 +++++++++++++++++++----------------
 2 files changed, 21 insertions(+), 18 deletions(-)

diff --git a/include/GL/freeglut_std.h b/include/GL/freeglut_std.h
index f5b1ebf..ce0ad2a 100644
--- a/include/GL/freeglut_std.h
+++ b/include/GL/freeglut_std.h
@@ -528,10 +528,10 @@ FGAPI int     FGAPIENTRY glutStrokeLength( void* font, const unsigned char* stri
 #ifndef GL_ES_VERSION_2_0
 FGAPI void    FGAPIENTRY glutWireCube( double size );
 FGAPI void    FGAPIENTRY glutSolidCube( double size );
-#endif
-#ifndef EGL_VERSION_1_0
 FGAPI void    FGAPIENTRY glutWireSphere( double radius, GLint slices, GLint stacks );
 FGAPI void    FGAPIENTRY glutSolidSphere( double radius, GLint slices, GLint stacks );
+#endif
+#ifndef EGL_VERSION_1_0
 FGAPI void    FGAPIENTRY glutWireCone( double base, double height, GLint slices, GLint stacks );
 FGAPI void    FGAPIENTRY glutSolidCone( double base, double height, GLint slices, GLint stacks );
 #endif
diff --git a/src/fg_geometry.c b/src/fg_geometry.c
index 97d1534..4dbee68 100644
--- a/src/fg_geometry.c
+++ b/src/fg_geometry.c
@@ -823,6 +823,9 @@ static void fghSphere( double radius, GLint slices, GLint stacks, GLboolean useW
     int i,j,idx, nVert;
     GLfloat *vertices, *normals;
 
+    if (slices * stacks > 65535)
+	fgWarning("fghSphere: too many slices or stacks requested, indices will wrap");
+
     /* Generate vertices and normals */
     fghGenerateSphere((GLfloat)radius,slices,stacks,&vertices,&normals,&nVert);
     
@@ -832,19 +835,19 @@ static void fghSphere( double radius, GLint slices, GLint stacks, GLboolean useW
 
     if (useWireMode)
     {
-        GLuint  *sliceIdx, *stackIdx;
+        GLushort  *sliceIdx, *stackIdx;
         /* First, generate vertex index arrays for drawing with glDrawElements
          * We have a bunch of line_loops to draw for each stack, and a
          * bunch for each slice.
          */
 
-        sliceIdx = malloc(slices*(stacks+1)*sizeof(GLuint));
-        stackIdx = malloc(slices*(stacks-1)*sizeof(GLuint));
+        sliceIdx = malloc(slices*(stacks+1)*sizeof(GLushort));
+        stackIdx = malloc(slices*(stacks-1)*sizeof(GLushort));
 
         /* generate for each stack */
         for (i=0,idx=0; i<slices; i++)
         {
-            GLuint offset = 1+i;                    /* start at 1 (0 is top vertex), and we advance one slice as we go along */
+            GLushort offset = 1+i;                  /* start at 1 (0 is top vertex), and we advance one slice as we go along */
             sliceIdx[idx++] = 0;                    /* vertex on top */
             for (j=0; j<stacks-1; j++, idx++)
             {
@@ -856,7 +859,7 @@ static void fghSphere( double radius, GLint slices, GLint stacks, GLboolean useW
         /* generate for each stack */
         for (i=0,idx=0; i<stacks-1; i++)
         {
-            GLuint offset = 1+i*slices;             /* start at 1 (0 is top vertex), and we advance one stack down as we go along */
+            GLushort offset = 1+i*slices;           /* start at 1 (0 is top vertex), and we advance one stack down as we go along */
             for (j=0; j<slices; j++, idx++)
             {
                 stackIdx[idx] = offset+j;
@@ -871,10 +874,10 @@ static void fghSphere( double radius, GLint slices, GLint stacks, GLboolean useW
         glNormalPointer(GL_FLOAT, 0, normals);
         /*draw slices*/
         for (i=0; i<slices; i++)
-            glDrawElements(GL_LINE_STRIP,stacks+1,GL_UNSIGNED_INT,sliceIdx+i*(stacks+1));
+            glDrawElements(GL_LINE_STRIP,stacks+1,GL_UNSIGNED_SHORT,sliceIdx+i*(stacks+1));
         /*draw stacks*/
         for (i=0; i<stacks-1; i++)
-            glDrawElements(GL_LINE_LOOP, slices,GL_UNSIGNED_INT,stackIdx+i*slices);
+            glDrawElements(GL_LINE_LOOP, slices,GL_UNSIGNED_SHORT,stackIdx+i*slices);
 
         glDisableClientState(GL_VERTEX_ARRAY);
         glDisableClientState(GL_NORMAL_ARRAY);
@@ -885,7 +888,7 @@ static void fghSphere( double radius, GLint slices, GLint stacks, GLboolean useW
     }
     else
     {
-        GLuint  *topIdx, *bottomIdx, *stripIdx;
+        GLushort  *topIdx, *bottomIdx, *stripIdx;
         /* First, generate vertex index arrays for drawing with glDrawElements
          * Top and bottom are covered with a triangle fan
          * Each other stack with triangle strip. Only need to generate on
@@ -894,9 +897,9 @@ static void fghSphere( double radius, GLint slices, GLint stacks, GLboolean useW
          */
 
         /* Allocate buffers for indices, bail out if memory allocation fails */
-        topIdx = malloc((slices+2)*sizeof(GLuint));
-        bottomIdx = malloc((slices+2)*sizeof(GLuint));
-        stripIdx = malloc((slices+1)*2*(stacks-2)*sizeof(GLuint));
+        topIdx = malloc((slices+2)*sizeof(GLushort));
+        bottomIdx = malloc((slices+2)*sizeof(GLushort));
+        stripIdx = malloc((slices+1)*2*(stacks-2)*sizeof(GLushort));
         if (!(topIdx) || !(bottomIdx) || !(stripIdx))
         {
             free(topIdx);
@@ -924,7 +927,7 @@ static void fghSphere( double radius, GLint slices, GLint stacks, GLboolean useW
         /* Strip indices are relative to first index belonging to strip, NOT relative to first vertex/normal pair in array */
         for (i=0,idx=0; i<stacks-2; i++, idx+=2)
         {
-            GLuint offset = 1+i*slices;             /* triangle_strip indices start at 1 (0 is top vertex), and we advance one stack down as we go along */
+            GLushort offset = 1+i*slices;             /* triangle_strip indices start at 1 (0 is top vertex), and we advance one stack down as we go along */
             for (j=0; j<slices; j++, idx+=2)
             {
                 stripIdx[idx  ] = offset+j+slices;
@@ -942,12 +945,12 @@ static void fghSphere( double radius, GLint slices, GLint stacks, GLboolean useW
         glVertexPointer(3, GL_FLOAT, 0, vertices);
         glNormalPointer(GL_FLOAT, 0, normals);
         /*draw top*/
-        glDrawElements(GL_TRIANGLE_FAN,slices+2,GL_UNSIGNED_INT,topIdx);
+        glDrawElements(GL_TRIANGLE_FAN,slices+2,GL_UNSIGNED_SHORT,topIdx);
         /*draw stacks*/
         for (i=0; i<stacks-2; i++)
-            glDrawElements(GL_TRIANGLE_STRIP,(slices+1)*2,GL_UNSIGNED_INT,stripIdx+i*(slices+1)*2);
+            glDrawElements(GL_TRIANGLE_STRIP,(slices+1)*2,GL_UNSIGNED_SHORT,stripIdx+i*(slices+1)*2);
         /*draw bottom*/
-        glDrawElements(GL_TRIANGLE_FAN,slices+2,GL_UNSIGNED_INT,bottomIdx);
+        glDrawElements(GL_TRIANGLE_FAN,slices+2,GL_UNSIGNED_SHORT,bottomIdx);
 
         glDisableClientState(GL_VERTEX_ARRAY);
         glDisableClientState(GL_NORMAL_ARRAY);
@@ -969,7 +972,6 @@ static void fghSphere( double radius, GLint slices, GLint stacks, GLboolean useW
 /* -- INTERFACE FUNCTIONS ---------------------------------------------- */
 
 
-#ifndef EGL_VERSION_1_0
 /*
  * Draws a solid sphere
  */
@@ -991,6 +993,7 @@ void FGAPIENTRY glutWireSphere(double radius, GLint slices, GLint stacks)
     
 }
 
+#ifndef EGL_VERSION_1_0
 /*
  * Draws a solid cone
  */
-- 
1.7.10.4