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little bit of cleanup

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added code for GLES1 (though only tested on OpenGL 2, non-ES context)


git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1170 7f0cb862-5218-0410-a997-914c9d46530a
This commit is contained in:
dcnieho 2012-03-17 03:58:26 +00:00
parent 99cd253ea3
commit da52865ab3
1 changed files with 95 additions and 62 deletions
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145
freeglut/freeglut/src/fg_geometry.c
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@ -29,38 +29,7 @@
#include "fg_internal.h"
/*
*
* Need more types of polyhedra? See CPolyhedron in MRPT
*
* TODO BEFORE THE STABLE RELEASE:
*
* See fghTetrahedron
*
* Following functions have been contributed by Andreas Umbach.
*
* glutWireCube() -- looks OK
* glutSolidCube() -- OK
*
* Those functions have been implemented by John Fay.
*
* glutWireTorus() -- looks OK
* glutSolidTorus() -- looks OK
* glutWireDodecahedron() -- looks OK
* glutSolidDodecahedron() -- looks OK
* glutWireOctahedron() -- looks OK
* glutSolidOctahedron() -- looks OK
* glutWireTetrahedron() -- looks OK
* glutSolidTetrahedron() -- looks OK
* glutWireIcosahedron() -- looks OK
* glutSolidIcosahedron() -- looks OK
*
* The Following functions have been updated by Nigel Stewart, based
* on FreeGLUT 2.0.0 implementations:
*
* glutWireSphere() -- looks OK
* glutSolidSphere() -- looks OK
* glutWireCone() -- looks OK
* glutSolidCone() -- looks OK
*/
@ -70,8 +39,71 @@
* useWireMode controls the drawing of solids (false) or wire frame
* versions (TRUE) of the geometry you pass
*/
static void fghDrawGeometry(GLenum vertexMode, GLdouble *vertices, GLdouble *normals, GLboolean *edgeFlags, GLsizei numVertices, GLboolean useWireMode)
static void fghDrawGeometry(GLdouble *vertices, GLdouble *normals, GLboolean *edgeFlags, GLsizei numVertices, GLsizei numFaces, GLsizei numEdgePerFace, GLboolean useWireMode)
{
# ifdef FREEGLUT_GLES
/* Solid drawing is the same for OpenGL 1.x and OpenGL ES 1.x, just
* no edge flags for ES.
* WireFrame drawing will have to be done per face though, using
* GL_LINE_LOOP and issuing one draw call per face. For triangles,
* we use glDrawArrays directly on the vertex data for each face,
* while for shapes that are composed of quads or pentagons, we use
* glDrawElements with index vector {0,1,2,5} or {0,1,2,8,5},
* respectively.
* We use the first parameter in glDrawArrays or glDrawElements to
* go from face to face.
*/
if (useWireMode)
{
/* setup reading the right elements from vertex array */
GLubyte vertIdx4[4] = {0,1,2,5};
GLubyte vertIdx5[5] = {0,1,2,8,5};
GLubyte *indices = NULL;
int vertStride, i, j;
switch (numEdgePerFace)
{
case 3:
vertStride = 3; /* there are 3 vertices for each face in the array */
break;
case 4:
indices = vertIdx4;
vertStride = 6; /* there are 6 vertices for each face in the array */
break;
case 5:
indices = vertIdx5;
vertStride = 9; /* there are 9 vertices for each face in the array */
break;
}
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glVertexPointer(3, GL_DOUBLE, 0, vertices);
glNormalPointer(GL_DOUBLE, 0, normals);
if (numEdgePerFace==3)
for (i=0; i<numFaces; i++)
glDrawArrays(GL_LINE_LOOP, i*vertStride, numEdgePerFace);
else
{
GLubyte *vertIndices = malloc(numEdgePerFace*sizeof(GLubyte));
for (i=0; i<numFaces; i++)
{
for (j=0; j< numEdgePerFace; j++)
vertIndices[j] = indices[j]+i*vertStride;
glDrawElements(GL_LINE_LOOP, numEdgePerFace, GL_UNSIGNED_BYTE, vertIndices);
}
free(vertIndices);
}
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
return; /* done */
}
# endif
if (useWireMode)
{
glPushAttrib(GL_POLYGON_BIT);
@ -79,48 +111,46 @@ static void fghDrawGeometry(GLenum vertexMode, GLdouble *vertices, GLdouble *nor
glDisable(GL_CULL_FACE);
}
if (1)
{
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
# ifndef FREEGLUT_GLES
if (edgeFlags)
glEnableClientState(GL_EDGE_FLAG_ARRAY);
# endif
glVertexPointer(3, GL_DOUBLE, 0, vertices);
glNormalPointer(GL_DOUBLE, 0, normals);
# ifndef FREEGLUT_GLES
if (edgeFlags)
glEdgeFlagPointer(0,edgeFlags);
glDrawArrays(vertexMode, 0, numVertices);
# endif
glDrawArrays(GL_TRIANGLES, 0, numVertices);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
# ifndef FREEGLUT_GLES
if (edgeFlags)
glDisableClientState(GL_EDGE_FLAG_ARRAY);
}
else
{
int i;
glBegin(vertexMode);
for(i=0; i<numVertices; i++)
{
glEdgeFlag(edgeFlags[i]);
glNormal3dv(normals+i*3);
printf("n(%i) = (%1.4f,%1.4f,%1.4f)\n",i,*(normals+i*3),*(normals+i*3+1),*(normals+i*3+2));
glVertex3dv(vertices+i*3);
printf("v(%i) = (%1.4f,%1.4f,%1.4f)\n",i,*(vertices+i*3),*(vertices+i*3+1),*(vertices+i*3+2));
}
glEnd();
}
# endif
if (useWireMode)
{
glPopAttrib();
}
/* Notes on OpenGL 3 and OpenGL ES2, drawing code for programmable pipeline:
* As above, we'll have to draw face-by-face for wireframes. On
* OpenGL 3 we can probably use glMultiDrawArrays do do this efficiently.
* other complications are VBOs and such...
*/
}
/* triangle decomposition and associated edgeFlags
* be careful to keep winding of all triangles counter-clockwise,
/* Triangle decomposition and associated edgeFlags generation
* Be careful to keep winding of all triangles counter-clockwise,
* assuming that input has correct winding...
* Could probably do something smarter using glDrawElements and generating
* an index vector here for all shapes that are not triangles, but this
* suffices for now. We're not talking many vertices in our objects anyway.
*/
static GLubyte vertSamp3[3] = {0,1,2};
static GLubyte vertSamp4[6] = {0,1,2, 0,2,3}; /* quad : 4 input vertices, 6 output (2 triangles) */
@ -675,7 +705,9 @@ static void fghCircleTable(double **sint,double **cost,const int n)
fgh##nameICaps##Generate();\
name##Cached = GL_TRUE;\
}\
fghDrawGeometry(GL_TRIANGLES,name##_verts,name##_norms,edgeFlags,nameCaps##_VERT_PER_OBJ_TRI,useWireMode);\
fghDrawGeometry(name##_verts,name##_norms,edgeFlags,\
nameCaps##_VERT_PER_OBJ_TRI,nameCaps##_NUM_FACES,nameCaps##_NUM_EDGE_PER_FACE,\
useWireMode);\
}
#define DECLARE_INTERNAL_DRAW(name,nameICaps,nameCaps) _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,NULL)
#define DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(name,nameICaps,nameCaps) _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,name##_edgeFlags)
@ -703,13 +735,13 @@ static void fghCube( GLdouble dSize, GLboolean useWireMode )
for (i=0; i<CUBE_VERT_ELEM_PER_OBJ; i++)
vertices[i] = dSize*cube_verts[i];
fghDrawGeometry(GL_TRIANGLES,vertices ,cube_norms,cube_edgeFlags,CUBE_VERT_PER_OBJ_TRI,useWireMode);
fghDrawGeometry(vertices ,cube_norms,cube_edgeFlags,CUBE_VERT_PER_OBJ_TRI,CUBE_NUM_FACES,CUBE_NUM_EDGE_PER_FACE,useWireMode);
/* cleanup allocated memory */
free(vertices);
}
else
fghDrawGeometry(GL_TRIANGLES,cube_verts,cube_norms,cube_edgeFlags,CUBE_VERT_PER_OBJ_TRI,useWireMode);
fghDrawGeometry(cube_verts,cube_norms,cube_edgeFlags,CUBE_VERT_PER_OBJ_TRI,CUBE_NUM_FACES,CUBE_NUM_EDGE_PER_FACE,useWireMode);
}
DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(dodecahedron,Dodecahedron,DODECAHEDRON);
@ -724,6 +756,7 @@ static void fghSierpinskiSponge ( int numLevels, GLdouble offset[3], GLdouble sc
GLdouble * normals;
GLsizei numTetr = numLevels<0? 0 : ipow(4,numLevels); /* No sponge for numLevels below 0 */
GLsizei numVert = numTetr*TETRAHEDRON_VERT_PER_OBJ;
GLsizei numFace = numTetr*TETRAHEDRON_NUM_FACES;
if (numTetr)
{
@ -742,7 +775,7 @@ static void fghSierpinskiSponge ( int numLevels, GLdouble offset[3], GLdouble sc
fghSierpinskiSpongeGenerate ( numLevels, offset, scale, vertices, normals );
/* Draw and cleanup */
fghDrawGeometry(GL_TRIANGLES,vertices,normals,NULL,numVert,useWireMode);
fghDrawGeometry(vertices,normals,NULL,numVert,numFace,TETRAHEDRON_NUM_EDGE_PER_FACE,useWireMode);
free(vertices);
free(normals );
}