/*
- * freeglut_geometry.c
+ * fg_geometry.c
*
* Freeglut geometry rendering methods.
*
#include <math.h>
/*
- * Need more types of polyhedra? See CPolyhedron in MRPT
+ * A note: We do not use the GLuint data type for vertex index arrays
+ * in this code as Open GL ES1 only supports GLushort. This affects the
+ * cylindrical objects only (Torus, Sphere, Cylinder and Cone) and limits
+ * their number of vertices to 65535 (2^16-1). Thats about 256*256
+ * subdivisions, which is sufficient for just about any usage case, so
+ * I am not going to worry about it for now.
+ * One could do compile time detection of the gluint type through CMake,
+ * but it is likely that we'll eventually move to runtime selection
+ * of OpenGL or GLES1/2, which would make that strategy useless...
*/
-/* VC++6 in C mode doesn't have C99's sinf/cos/sqrtf */
-#ifndef HAVE_SINF
-#define sinf(x) (float)sin((double)(x))
-#endif
-#ifndef HAVE_COSF
-#define cosf(x) (float)cos((double)(x))
-#endif
-#ifndef HAVE_SQRTF
-#define sqrtf(x) (float)sqrt((double)(x))
-#endif
-
-/* General functions for drawing geometry
- * Solids are drawn by glDrawArrays if composed of triangles, or by
- * glDrawElements if consisting of squares or pentagons that were
- * decomposed into triangles (some vertices are repeated in that case).
- * WireFrame drawing will have to be done per face, using GL_LINE_LOOP and
- * issuing one draw call per face. Always use glDrawArrays as no triangle
- * decomposition needed. We use the "first" parameter in glDrawArrays to go
- * from face to face.
+/* declare for drawing using the different OpenGL versions here so we can
+ have a nice code order below */
+static void fghDrawGeometryWire11(GLfloat *vertices, GLfloat *normals,
+ GLushort *vertIdxs, GLsizei numParts, GLsizei numVertPerPart, GLenum vertexMode,
+ GLushort *vertIdxs2, GLsizei numParts2, GLsizei numVertPerPart2
+ );
+static void fghDrawGeometrySolid11(GLfloat *vertices, GLfloat *normals, GLfloat *textcs, GLsizei numVertices,
+ GLushort *vertIdxs, GLsizei numParts, GLsizei numVertIdxsPerPart);
+static void fghDrawGeometryWire20(GLfloat *vertices, GLfloat *normals, GLsizei numVertices,
+ GLushort *vertIdxs, GLsizei numParts, GLsizei numVertPerPart, GLenum vertexMode,
+ GLushort *vertIdxs2, GLsizei numParts2, GLsizei numVertPerPart2,
+ GLint attribute_v_coord, GLint attribute_v_normal
+ );
+static void fghDrawGeometrySolid20(GLfloat *vertices, GLfloat *normals, GLfloat *textcs, GLsizei numVertices,
+ GLushort *vertIdxs, GLsizei numParts, GLsizei numVertIdxsPerPart,
+ GLint attribute_v_coord, GLint attribute_v_normal, GLint attribute_v_texture);
+/* declare function for generating visualization of normals */
+static void fghGenerateNormalVisualization(GLfloat *vertices, GLfloat *normals, GLsizei numVertices);
+static void fghDrawNormalVisualization11();
+static void fghDrawNormalVisualization20(GLint attribute_v_coord);
+
+/* Drawing geometry:
+ * Explanation of the functions has to be separate for the polyhedra and
+ * the non-polyhedra (objects with a circular cross-section).
+ * Polyhedra:
+ * - We have only implemented the five platonic solids and the rhomboid
+ * dodecahedron. If you need more types of polyhedra, please see
+ * CPolyhedron in MRPT
+ * - Solids are drawn by glDrawArrays if composed of triangular faces
+ * (the tetrahedron, octahedron, and icosahedron), or are first
+ * decomposed into triangles and then drawn by glDrawElements if its
+ * faces are squares or pentagons (cube, dodecahedron and rhombic
+ * dodecahedron) as some vertices are repeated in that case.
+ * - WireFrame drawing is done using a GL_LINE_LOOP per face, and thus
+ * issuing one draw call per face. glDrawArrays is always used as no
+ * triangle decomposition is needed to draw faces. We use the "first"
+ * parameter in glDrawArrays to go from face to face.
+ *
+ * Non-polyhedra:
+ * - We have implemented the sphere, cylinder, cone and torus.
+ * - All shapes are characterized by two parameters: the number of
+ * subdivisions along two axes used to construct the shape's vertices
+ * (e.g. stacks and slices for the sphere).
+ * As different subdivisions are most suitable for different shapes,
+ * and are thus also named differently, I wont provide general comments
+ * on them here.
+ * - Solids are drawn using glDrawArrays and GL_TRIANGLE_STRIP. Each
+ * strip covers one revolution around one of the two subdivision axes
+ * of the shape.
+ * - WireFrame drawing is done for the subdivisions along the two axes
+ * separately, usually using GL_LINE_LOOP. Vertex index arrays are
+ * built containing the vertices to be drawn for each loop, which are
+ * then drawn using multiple calls to glDrawElements. As the number of
+ * subdivisions along the two axes is not guaranteed to be equal, the
+ * vertex indices for e.g. stacks and slices are stored in separate
+ * arrays, which makes the input to the drawing function a bit clunky,
+ * but allows for the same drawing function to be used for all shapes.
+ */
+
+
+/**
+ * Draw geometric shape in wire mode (only edges)
+ *
+ * Arguments:
+ * GLfloat *vertices, GLfloat *normals, GLsizei numVertices
+ * The vertex coordinate and normal buffers, and the number of entries in
+ * those
+ * GLushort *vertIdxs
+ * a vertex indices buffer, optional (never passed for the polyhedra)
+ * GLsizei numParts, GLsizei numVertPerPart
+ * polyhedra: number of faces, and the number of vertices for drawing
+ * each face
+ * non-polyhedra: number of edges to draw for first subdivision (not
+ * necessarily equal to number of subdivisions requested by user, e.g.
+ * as each subdivision is enclosed by two edges), and number of
+ * vertices for drawing each
+ * numParts * numVertPerPart gives the number of entries in the vertex
+ * array vertIdxs
+ * GLenum vertexMode
+ * vertex drawing mode (e.g. always GL_LINE_LOOP for polyhedra, varies
+ * for others)
+ * GLushort *vertIdxs2, GLsizei numParts2, GLsizei numVertPerPart2
+ * non-polyhedra only: same as the above, but now for subdivisions along
+ * the other axis. Always drawn as GL_LINE_LOOP.
+ *
+ * Feel free to contribute better naming ;)
+ */
+void fghDrawGeometryWire(GLfloat *vertices, GLfloat *normals, GLsizei numVertices,
+ GLushort *vertIdxs, GLsizei numParts, GLsizei numVertPerPart, GLenum vertexMode,
+ GLushort *vertIdxs2, GLsizei numParts2, GLsizei numVertPerPart2
+ )
+{
+ SFG_Window *win = fgStructure.CurrentWindow;
+
+ GLint attribute_v_coord = win ? win->Window.attribute_v_coord : -1;
+ GLint attribute_v_normal = win ? win->Window.attribute_v_normal : -1;
+
+ if (fgState.HasOpenGL20 && (attribute_v_coord != -1 || attribute_v_normal != -1))
+ /* User requested a 2.0 draw */
+ fghDrawGeometryWire20(vertices, normals, numVertices,
+ vertIdxs, numParts, numVertPerPart, vertexMode,
+ vertIdxs2, numParts2, numVertPerPart2,
+ attribute_v_coord, attribute_v_normal);
+ else
+ fghDrawGeometryWire11(vertices, normals,
+ vertIdxs, numParts, numVertPerPart, vertexMode,
+ vertIdxs2, numParts2, numVertPerPart2);
+}
+
+/* Draw the geometric shape with filled triangles
+ *
+ * Arguments:
+ * GLfloat *vertices, GLfloat *normals, GLfloat *textcs, GLsizei numVertices
+ * The vertex coordinate, normal and texture coordinate buffers, and the
+ * number of entries in those
+ * GLushort *vertIdxs
+ * a vertex indices buffer, optional (not passed for the polyhedra with
+ * triangular faces)
+ * GLsizei numParts, GLsizei numVertPerPart
+ * polyhedra: not used for polyhedra with triangular faces
+ (numEdgePerFace==3), as each vertex+normal pair is drawn only once,
+ so no vertex indices are used.
+ Else, the shape was triangulated (DECOMPOSE_TO_TRIANGLE), leading to
+ reuse of some vertex+normal pairs, and thus the need to draw with
+ glDrawElements. numParts is always 1 in this case (we can draw the
+ whole object with one call to glDrawElements as the vertex index
+ array contains separate triangles), and numVertPerPart indicates
+ the number of vertex indices in the vertex array.
+ * non-polyhedra: number of parts (GL_TRIANGLE_STRIPs) to be drawn
+ separately (numParts calls to glDrawElements) to create the object.
+ numVertPerPart indicates the number of vertex indices to be
+ processed at each draw call.
+ * numParts * numVertPerPart gives the number of entries in the vertex
+ * array vertIdxs
*/
+void fghDrawGeometrySolid(GLfloat *vertices, GLfloat *normals, GLfloat *textcs, GLsizei numVertices,
+ GLushort *vertIdxs, GLsizei numParts, GLsizei numVertIdxsPerPart)
+{
+ GLint attribute_v_coord, attribute_v_normal, attribute_v_texture;
+ SFG_Window *win = fgStructure.CurrentWindow;
+ if(win) {
+ attribute_v_coord = win->Window.attribute_v_coord;
+ attribute_v_normal = win->Window.attribute_v_normal;
+ attribute_v_texture = win->Window.attribute_v_texture;
+ } else {
+ attribute_v_coord = attribute_v_normal = attribute_v_texture = -1;
+ }
+
+ if (win && win->State.VisualizeNormals)
+ /* generate normals for each vertex to be drawn as well */
+ fghGenerateNormalVisualization(vertices, normals, numVertices);
+
+ if (fgState.HasOpenGL20 && (attribute_v_coord != -1 || attribute_v_normal != -1))
+ {
+ /* User requested a 2.0 draw */
+ fghDrawGeometrySolid20(vertices, normals, textcs, numVertices,
+ vertIdxs, numParts, numVertIdxsPerPart,
+ attribute_v_coord, attribute_v_normal, attribute_v_texture);
+
+ if (win && win->State.VisualizeNormals)
+ /* draw normals for each vertex as well */
+ fghDrawNormalVisualization20(attribute_v_coord);
+ }
+ else
+ {
+ fghDrawGeometrySolid11(vertices, normals, textcs, numVertices,
+ vertIdxs, numParts, numVertIdxsPerPart);
+
+ if (win && win->State.VisualizeNormals)
+ /* draw normals for each vertex as well */
+ fghDrawNormalVisualization11();
+ }
+}
+
+
/* Version for OpenGL (ES) 1.1 */
-#ifndef GL_ES_VERSION_2_0
static void fghDrawGeometryWire11(GLfloat *vertices, GLfloat *normals,
- GLushort *vertIdxs, GLsizei numParts, GLsizei numVertPerPart, GLenum vertexMode,
- GLushort *vertIdxs2, GLsizei numParts2, GLsizei numVertPerPart2
+ GLushort *vertIdxs, GLsizei numParts, GLsizei numVertPerPart, GLenum vertexMode,
+ GLushort *vertIdxs2, GLsizei numParts2, GLsizei numVertPerPart2
)
{
int i;
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
}
-#endif
+
+
+static void fghDrawGeometrySolid11(GLfloat *vertices, GLfloat *normals, GLfloat *textcs, GLsizei numVertices,
+ GLushort *vertIdxs, GLsizei numParts, GLsizei numVertIdxsPerPart)
+{
+ int i;
+
+ glEnableClientState(GL_VERTEX_ARRAY);
+ glEnableClientState(GL_NORMAL_ARRAY);
+
+ glVertexPointer(3, GL_FLOAT, 0, vertices);
+ glNormalPointer(GL_FLOAT, 0, normals);
+
+ if (textcs)
+ {
+ glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+ glTexCoordPointer(2, GL_FLOAT, 0, textcs);
+ }
+
+ if (!vertIdxs)
+ glDrawArrays(GL_TRIANGLES, 0, numVertices);
+ else
+ if (numParts>1)
+ for (i=0; i<numParts; i++)
+ glDrawElements(GL_TRIANGLE_STRIP, numVertIdxsPerPart, GL_UNSIGNED_SHORT, vertIdxs+i*numVertIdxsPerPart);
+ else
+ glDrawElements(GL_TRIANGLES, numVertIdxsPerPart, GL_UNSIGNED_SHORT, vertIdxs);
+
+ glDisableClientState(GL_VERTEX_ARRAY);
+ glDisableClientState(GL_NORMAL_ARRAY);
+ if (textcs)
+ glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+}
/* Version for OpenGL (ES) >= 2.0 */
static void fghDrawGeometryWire20(GLfloat *vertices, GLfloat *normals, GLsizei numVertices,
- GLushort *vertIdxs, GLsizei numParts, GLsizei numVertPerPart, GLenum vertexMode,
- GLushort *vertIdxs2, GLsizei numParts2, GLsizei numVertPerPart2,
- GLint attribute_v_coord, GLint attribute_v_normal
- )
+ GLushort *vertIdxs, GLsizei numParts, GLsizei numVertPerPart, GLenum vertexMode,
+ GLushort *vertIdxs2, GLsizei numParts2, GLsizei numVertPerPart2,
+ GLint attribute_v_coord, GLint attribute_v_normal)
{
GLuint vbo_coords = 0, vbo_normals = 0,
ibo_elements = 0, ibo_elements2 = 0;
if (vertIdxs2) {
fghBindBuffer(FGH_ELEMENT_ARRAY_BUFFER, ibo_elements2);
- static float t2 = 0;
- t2 += 0.1;
- if (t2 >= numParts2)
- t2 = 0;
for (i=0; i<numParts2; i++)
glDrawElements(GL_LINE_LOOP, numVertPerPart2,
GL_UNSIGNED_SHORT, (GLvoid*)(sizeof(vertIdxs2[0])*i*numVertPerPart2));
fghDeleteBuffers(1, &ibo_elements2);
}
-static void fghDrawGeometryWire(GLfloat *vertices, GLfloat *normals, GLsizei numVertices,
- GLushort *vertIdxs, GLsizei numParts, GLsizei numVertPerPart, GLenum vertexMode,
- GLushort *vertIdxs2, GLsizei numParts2, GLsizei numVertPerPart2
- )
-{
- GLint attribute_v_coord = fgStructure.CurrentWindow->Window.attribute_v_coord;
- GLint attribute_v_normal = fgStructure.CurrentWindow->Window.attribute_v_normal;
-
- if (fgState.HasOpenGL20 && (attribute_v_coord != -1 || attribute_v_normal != -1))
- /* User requested a 2.0 draw */
- fghDrawGeometryWire20(vertices, normals, numVertices,
- vertIdxs, numParts, numVertPerPart, vertexMode,
- vertIdxs2, numParts2, numVertPerPart2,
- attribute_v_coord, attribute_v_normal);
-#ifndef GL_ES_VERSION_2_0
- else
- fghDrawGeometryWire11(vertices, normals,
- vertIdxs, numParts, numVertPerPart, vertexMode,
- vertIdxs2, numParts2, numVertPerPart2);
-#endif
-}
-
-
-/* Draw the geometric shape with filled triangles
- *
- * - If the shape is naturally triangulated (numEdgePerFace==3), each
- * vertex+normal pair is used only once, so no vertex indices.
- *
- * - If the shape was triangulated (DECOMPOSE_TO_TRIANGLE), some
- * vertex+normal pairs are reused, so use vertex indices.
- */
-
-/* Version for OpenGL (ES) 1.1 */
-#ifndef GL_ES_VERSION_2_0
-static void fghDrawGeometrySolid11(GLfloat *vertices, GLfloat *normals, GLushort *vertIdxs,
- GLsizei numVertices, GLsizei numParts, GLsizei numVertIdxsPerPart)
-{
- int i;
-
- glEnableClientState(GL_VERTEX_ARRAY);
- glEnableClientState(GL_NORMAL_ARRAY);
- glVertexPointer(3, GL_FLOAT, 0, vertices);
- glNormalPointer(GL_FLOAT, 0, normals);
- if (vertIdxs == NULL)
- glDrawArrays(GL_TRIANGLES, 0, numVertices);
- else
- if (numParts>1)
- for (i=0; i<numParts; i++)
- glDrawElements(GL_TRIANGLE_STRIP, numVertIdxsPerPart, GL_UNSIGNED_SHORT, vertIdxs+i*numVertIdxsPerPart);
- else
- glDrawElements(GL_TRIANGLES, numVertIdxsPerPart, GL_UNSIGNED_SHORT, vertIdxs);
- glDisableClientState(GL_VERTEX_ARRAY);
- glDisableClientState(GL_NORMAL_ARRAY);
-}
-#endif
/* Version for OpenGL (ES) >= 2.0 */
-static void fghDrawGeometrySolid20(GLfloat *vertices, GLfloat *normals, GLushort *vertIdxs,
- GLsizei numVertices, GLsizei numParts, GLsizei numVertIdxsPerPart,
- GLint attribute_v_coord, GLint attribute_v_normal)
+static void fghDrawGeometrySolid20(GLfloat *vertices, GLfloat *normals, GLfloat *textcs, GLsizei numVertices,
+ GLushort *vertIdxs, GLsizei numParts, GLsizei numVertIdxsPerPart,
+ GLint attribute_v_coord, GLint attribute_v_normal, GLint attribute_v_texture)
{
- GLuint vbo_coords = 0, vbo_normals = 0, ibo_elements = 0;
+ GLuint vbo_coords = 0, vbo_normals = 0, vbo_textcs = 0, ibo_elements = 0;
GLsizei numVertIdxs = numParts * numVertIdxsPerPart;
int i;
normals, FGH_STATIC_DRAW);
fghBindBuffer(FGH_ARRAY_BUFFER, 0);
}
+
+ if (numVertices > 0 && attribute_v_texture != -1 && textcs) {
+ fghGenBuffers(1, &vbo_textcs);
+ fghBindBuffer(FGH_ARRAY_BUFFER, vbo_textcs);
+ fghBufferData(FGH_ARRAY_BUFFER, numVertices * 2 * sizeof(textcs[0]),
+ textcs, FGH_STATIC_DRAW);
+ fghBindBuffer(FGH_ARRAY_BUFFER, 0);
+ }
if (vertIdxs != NULL) {
fghGenBuffers(1, &ibo_elements);
);
fghBindBuffer(FGH_ARRAY_BUFFER, 0);
};
+
+ if (vbo_textcs) {
+ fghEnableVertexAttribArray(attribute_v_texture);
+ fghBindBuffer(FGH_ARRAY_BUFFER, vbo_textcs);
+ fghVertexAttribPointer(
+ attribute_v_texture,/* attribute */
+ 2, /* number of elements per vertex, here (s,t) */
+ GL_FLOAT, /* the type of each element */
+ GL_FALSE, /* take our values as-is */
+ 0, /* no extra data between each position */
+ 0 /* offset of first element */
+ );
+ fghBindBuffer(FGH_ARRAY_BUFFER, 0);
+ };
if (vertIdxs == NULL) {
glDrawArrays(GL_TRIANGLES, 0, numVertices);
fghDisableVertexAttribArray(attribute_v_coord);
if (vbo_normals != 0)
fghDisableVertexAttribArray(attribute_v_normal);
+ if (vbo_textcs != 0)
+ fghDisableVertexAttribArray(attribute_v_texture);
if (vbo_coords != 0)
fghDeleteBuffers(1, &vbo_coords);
if (vbo_normals != 0)
fghDeleteBuffers(1, &vbo_normals);
+ if (vbo_textcs != 0)
+ fghDeleteBuffers(1, &vbo_textcs);
if (ibo_elements != 0)
fghDeleteBuffers(1, &ibo_elements);
}
-static void fghDrawGeometrySolid(GLfloat *vertices, GLfloat *normals, GLushort *vertIdxs,
- GLsizei numVertices, GLsizei numParts, GLsizei numVertIdxsPerPart)
+
+
+/**
+ * Generate vertex indices for visualizing the normals.
+ * vertices are written into verticesForNormalVisualization.
+ * This must be freed by caller, we do the free at the
+ * end of fghDrawNormalVisualization11/fghDrawNormalVisualization20
+ */
+static GLfloat *verticesForNormalVisualization;
+static GLsizei numNormalVertices = 0;
+static void fghGenerateNormalVisualization(GLfloat *vertices, GLfloat *normals, GLsizei numVertices)
{
- GLint attribute_v_coord = fgStructure.CurrentWindow->Window.attribute_v_coord;
- GLint attribute_v_normal = fgStructure.CurrentWindow->Window.attribute_v_normal;
+ int i,j;
+ numNormalVertices = numVertices * 2;
+ verticesForNormalVisualization = malloc(numNormalVertices*3 * sizeof(GLfloat));
- if (fgState.HasOpenGL20 && (attribute_v_coord != -1 || attribute_v_normal != -1))
- /* User requested a 2.0 draw */
- fghDrawGeometrySolid20(vertices, normals, vertIdxs,
- numVertices, numParts, numVertIdxsPerPart,
- attribute_v_coord, attribute_v_normal);
-#ifndef GL_ES_VERSION_2_0
- else
- fghDrawGeometrySolid11(vertices, normals, vertIdxs,
- numVertices, numParts, numVertIdxsPerPart);
-#endif
+ for (i=0,j=0; i<numNormalVertices*3/2; i+=3, j+=6)
+ {
+ verticesForNormalVisualization[j+0] = vertices[i+0];
+ verticesForNormalVisualization[j+1] = vertices[i+1];
+ verticesForNormalVisualization[j+2] = vertices[i+2];
+ verticesForNormalVisualization[j+3] = vertices[i+0] + normals[i+0]/4.f;
+ verticesForNormalVisualization[j+4] = vertices[i+1] + normals[i+1]/4.f;
+ verticesForNormalVisualization[j+5] = vertices[i+2] + normals[i+2]/4.f;
+ }
+}
+
+/* Version for OpenGL (ES) 1.1 */
+static void fghDrawNormalVisualization11()
+{
+ GLfloat currentColor[4];
+ /* Setup draw color: (1,1,1)-shape's color */
+ glGetFloatv(GL_CURRENT_COLOR,currentColor);
+ glColor4f(1-currentColor[0],1-currentColor[1],1-currentColor[2],currentColor[3]);
+
+ glEnableClientState(GL_VERTEX_ARRAY);
+
+ glVertexPointer(3, GL_FLOAT, 0, verticesForNormalVisualization);
+ glDrawArrays(GL_LINES, 0, numNormalVertices);
+
+ glDisableClientState(GL_VERTEX_ARRAY);
+
+ /* Done, free memory, reset color */
+ free(verticesForNormalVisualization);
+ glColor4f(currentColor[0],currentColor[1],currentColor[2],currentColor[3]);
}
-/* Shape decomposition to triangles
+/* Version for OpenGL (ES) >= 2.0 */
+static void fghDrawNormalVisualization20(GLint attribute_v_coord)
+{
+ GLuint vbo_coords = 0;
+
+ if (attribute_v_coord != -1) {
+ fghGenBuffers(1, &vbo_coords);
+ fghBindBuffer(FGH_ARRAY_BUFFER, vbo_coords);
+ fghBufferData(FGH_ARRAY_BUFFER, numNormalVertices * 3 * sizeof(verticesForNormalVisualization[0]),
+ verticesForNormalVisualization, FGH_STATIC_DRAW);
+ }
+
+
+ if (vbo_coords) {
+ fghEnableVertexAttribArray(attribute_v_coord);
+ fghBindBuffer(FGH_ARRAY_BUFFER, vbo_coords);
+ fghVertexAttribPointer(
+ attribute_v_coord, /* attribute */
+ 3, /* number of elements per vertex, here (x,y,z) */
+ GL_FLOAT, /* the type of each element */
+ GL_FALSE, /* take our values as-is */
+ 0, /* no extra data between each position */
+ 0 /* offset of first element */
+ );
+ fghBindBuffer(FGH_ARRAY_BUFFER, 0);
+ }
+
+ glDrawArrays(GL_LINES, 0, numNormalVertices);
+
+ if (vbo_coords != 0)
+ fghDisableVertexAttribArray(attribute_v_coord);
+
+ if (vbo_coords != 0)
+ fghDeleteBuffers(1, &vbo_coords);
+
+ /* Done, free memory */
+ free(verticesForNormalVisualization);
+}
+
+/**
+ * Generate all combinations of vertices and normals needed to draw object.
+ * Optional shape decomposition to triangles:
* We'll use glDrawElements to draw all shapes that are not naturally
* composed of triangles, so generate an index vector here, using the
* below sampling scheme.
* vertices and normals are unique.
*/
#define DECLARE_SHAPE_CACHE(name,nameICaps,nameCaps)\
- static GLboolean name##Cached = FALSE;\
- static GLfloat name##_verts[nameCaps##_VERT_ELEM_PER_OBJ];\
- static GLfloat name##_norms[nameCaps##_VERT_ELEM_PER_OBJ];\
+ static GLboolean name##Cached = GL_FALSE;\
+ static GLfloat name##_verts[nameCaps##_VERT_ELEM_PER_OBJ];\
+ static GLfloat name##_norms[nameCaps##_VERT_ELEM_PER_OBJ];\
static void fgh##nameICaps##Generate()\
{\
fghGenerateGeometry(nameCaps##_NUM_FACES, nameCaps##_NUM_EDGE_PER_FACE,\
name##_verts, name##_norms);\
}
#define DECLARE_SHAPE_CACHE_DECOMPOSE_TO_TRIANGLE(name,nameICaps,nameCaps)\
- static GLboolean name##Cached = FALSE;\
- static GLfloat name##_verts[nameCaps##_VERT_ELEM_PER_OBJ];\
- static GLfloat name##_norms[nameCaps##_VERT_ELEM_PER_OBJ];\
- static GLushort name##_vertIdxs[nameCaps##_VERT_PER_OBJ_TRI];\
+ static GLboolean name##Cached = GL_FALSE;\
+ static GLfloat name##_verts[nameCaps##_VERT_ELEM_PER_OBJ];\
+ static GLfloat name##_norms[nameCaps##_VERT_ELEM_PER_OBJ];\
+ static GLushort name##_vertIdxs[nameCaps##_VERT_PER_OBJ_TRI];\
static void fgh##nameICaps##Generate()\
{\
fghGenerateGeometryWithIndexArray(nameCaps##_NUM_FACES, nameCaps##_NUM_EDGE_PER_FACE,\
/* -- Sierpinski Sponge -- */
static unsigned int ipow (int x, unsigned int y)
{
- return y==0? 1: y==1? x: (y%2? x: 1) * ipow(x*x, y/2);
+ /* return y==0? 1: y==1? x: (y%2? x: 1) * ipow(x*x, y/2); */
+ if (y==0)
+ return 1;
+ else
+ {
+ if (y==1)
+ return x;
+ else
+ {
+ return (y%2? x: 1) * ipow(x*x, y/2);
+ }
+ }
}
static void fghSierpinskiSpongeGenerate ( int numLevels, double offset[3], GLfloat scale, GLfloat* vertices, GLfloat* normals )
}
}
-/* -- Now the various shapes involving circles -- */
+/* -- Now the various non-polyhedra (shapes involving circles) -- */
/*
* Compute lookup table of cos and sin values forming a circle
* (or half circle if halfCircle==TRUE)
for (i=1; i<size; i++)
{
- (*sint)[i] = sinf(angle*i);
- (*cost)[i] = cosf(angle*i);
+ (*sint)[i] = (GLfloat)sin(angle*i);
+ (*cost)[i] = (GLfloat)cos(angle*i);
}
return;
}
*nVert = slices*(stacks-1)+2;
- if ((*nVert) > 65535) /* TODO: must have a better solution than this low limit, at least for architectures where gluint is available */
+ if ((*nVert) > 65535)
+ /*
+ * limit of glushort, thats 256*256 subdivisions, should be enough in practice. See note above
+ */
fgWarning("fghGenerateSphere: too many slices or stacks requested, indices will wrap");
/* precompute values on unit circle */
- fghCircleTable(&sint1,&cost1,-slices,FALSE);
- fghCircleTable(&sint2,&cost2, stacks,TRUE);
+ fghCircleTable(&sint1,&cost1,-slices,GL_FALSE);
+ fghCircleTable(&sint2,&cost2, stacks,GL_TRUE);
/* Allocate vertex and normal buffers, bail out if memory allocation fails */
*vertices = malloc((*nVert)*3*sizeof(GLfloat));
const GLfloat rStep = (GLfloat)base / ( ( stacks > 0 ) ? stacks : 1 );
/* Scaling factors for vertex normals */
- const GLfloat cosn = ( (GLfloat)height / sqrtf( height * height + base * base ));
- const GLfloat sinn = ( (GLfloat)base / sqrtf( height * height + base * base ));
+ const GLfloat cosn = (GLfloat) (height / sqrt( height * height + base * base ));
+ const GLfloat sinn = (GLfloat) (base / sqrt( height * height + base * base ));
*nVert = slices*(stacks+2)+1; /* need an extra stack for closing off bottom with correct normals */
if ((*nVert) > 65535)
+ /*
+ * limit of glushort, thats 256*256 subdivisions, should be enough in practice. See note above
+ */
fgWarning("fghGenerateCone: too many slices or stacks requested, indices will wrap");
/* Pre-computed circle */
- fghCircleTable(&sint,&cost,-slices,FALSE);
+ fghCircleTable(&sint,&cost,-slices,GL_FALSE);
/* Allocate vertex and normal buffers, bail out if memory allocation fails */
*vertices = malloc((*nVert)*3*sizeof(GLfloat));
{
free(*vertices);
free(*normals);
- fgError("Failed to allocate memory in fghGenerateSphere");
+ fgError("Failed to allocate memory in fghGenerateCone");
}
/* bottom */
(*vertices)[idx ] = cost[j]*r;
(*vertices)[idx+1] = sint[j]*r;
(*vertices)[idx+2] = z;
- (*normals )[idx ] = cost[j]*sinn;
- (*normals )[idx+1] = sint[j]*sinn;
- (*normals )[idx+2] = cosn;
+ (*normals )[idx ] = cost[j]*cosn;
+ (*normals )[idx+1] = sint[j]*cosn;
+ (*normals )[idx+2] = sinn;
}
z += zStep;
*nVert = slices*(stacks+3)+2; /* need two extra stacks for closing off top and bottom with correct normals */
if ((*nVert) > 65535)
+ /*
+ * limit of glushort, thats 256*256 subdivisions, should be enough in practice. See note above
+ */
fgWarning("fghGenerateCylinder: too many slices or stacks requested, indices will wrap");
/* Pre-computed circle */
- fghCircleTable(&sint,&cost,-slices,FALSE);
+ fghCircleTable(&sint,&cost,-slices,GL_FALSE);
/* Allocate vertex and normal buffers, bail out if memory allocation fails */
*vertices = malloc((*nVert)*3*sizeof(GLfloat));
*nVert = nSides * nRings;
if ((*nVert) > 65535)
+ /*
+ * limit of glushort, thats 256*256 subdivisions, should be enough in practice. See note above
+ */
fgWarning("fghGenerateTorus: too many slices or stacks requested, indices will wrap");
/* precompute values on unit circle */
- fghCircleTable(&spsi,&cpsi, nRings,FALSE);
- fghCircleTable(&sphi,&cphi,-nSides,FALSE);
+ fghCircleTable(&spsi,&cpsi, nRings,GL_FALSE);
+ fghCircleTable(&sphi,&cphi,-nSides,GL_FALSE);
/* Allocate vertex and normal buffers, bail out if memory allocation fails */
*vertices = malloc((*nVert)*3*sizeof(GLfloat));
}\
else\
{\
- fghDrawGeometrySolid(name##_verts,name##_norms,vertIdxs,\
- nameCaps##_VERT_PER_OBJ, 1, nameCaps##_VERT_PER_OBJ_TRI); \
+ fghDrawGeometrySolid(name##_verts,name##_norms,NULL,nameCaps##_VERT_PER_OBJ,\
+ vertIdxs, 1, nameCaps##_VERT_PER_OBJ_TRI); \
}\
}
#define DECLARE_INTERNAL_DRAW(name,nameICaps,nameCaps) _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,NULL)
NULL,CUBE_NUM_FACES, CUBE_NUM_EDGE_PER_FACE,GL_LINE_LOOP,
NULL,0,0);
else
- fghDrawGeometrySolid(vertices, cube_norms, cube_vertIdxs,
- CUBE_VERT_PER_OBJ, 1, CUBE_VERT_PER_OBJ_TRI);
+ fghDrawGeometrySolid(vertices, cube_norms, NULL, CUBE_VERT_PER_OBJ,
+ cube_vertIdxs, 1, CUBE_VERT_PER_OBJ_TRI);
if (dSize!=1.f)
/* cleanup allocated memory */
NULL,numFace,TETRAHEDRON_NUM_EDGE_PER_FACE,GL_LINE_LOOP,
NULL,0,0);
else
- fghDrawGeometrySolid(vertices,normals,NULL,numVert,1,0);
+ fghDrawGeometrySolid(vertices,normals,NULL,numVert,NULL,1,0);
free(vertices);
free(normals );
}
-static void fghSphere( double radius, GLint slices, GLint stacks, GLboolean useWireMode )
+static void fghSphere( GLfloat radius, GLint slices, GLint stacks, GLboolean useWireMode )
{
int i,j,idx, nVert;
GLfloat *vertices, *normals;
/* Generate vertices and normals */
- fghGenerateSphere((GLfloat)radius,slices,stacks,&vertices,&normals,&nVert);
+ fghGenerateSphere(radius,slices,stacks,&vertices,&normals,&nVert);
if (nVert==0)
/* nothing to draw */
/* draw */
- fghDrawGeometrySolid(vertices,normals,stripIdx,nVert,stacks,(slices+1)*2);
+ fghDrawGeometrySolid(vertices,normals,NULL,nVert,stripIdx,stacks,(slices+1)*2);
/* cleanup allocated memory */
free(stripIdx);
free(normals);
}
-static void fghCone( double base, double height, GLint slices, GLint stacks, GLboolean useWireMode )
+static void fghCone( GLfloat base, GLfloat height, GLint slices, GLint stacks, GLboolean useWireMode )
{
int i,j,idx, nVert;
GLfloat *vertices, *normals;
/* Generate vertices and normals */
/* Note, (stacks+1)*slices vertices for side of object, slices+1 for top and bottom closures */
- fghGenerateCone((GLfloat)base,(GLfloat)height,slices,stacks,&vertices,&normals,&nVert);
+ fghGenerateCone(base,height,slices,stacks,&vertices,&normals,&nVert);
if (nVert==0)
/* nothing to draw */
}
/* draw */
- fghDrawGeometrySolid(vertices,normals,stripIdx,nVert,stacks+1,(slices+1)*2);
+ fghDrawGeometrySolid(vertices,normals,NULL,nVert,stripIdx,stacks+1,(slices+1)*2);
/* cleanup allocated memory */
free(stripIdx);
free(normals);
}
-static void fghCylinder( double radius, double height, GLint slices, GLint stacks, GLboolean useWireMode )
+static void fghCylinder( GLfloat radius, GLfloat height, GLint slices, GLint stacks, GLboolean useWireMode )
{
int i,j,idx, nVert;
GLfloat *vertices, *normals;
/* Generate vertices and normals */
/* Note, (stacks+1)*slices vertices for side of object, 2*slices+2 for top and bottom closures */
- fghGenerateCylinder((GLfloat)radius,(GLfloat)height,slices,stacks,&vertices,&normals,&nVert);
+ fghGenerateCylinder(radius,height,slices,stacks,&vertices,&normals,&nVert);
if (nVert==0)
/* nothing to draw */
stripIdx[idx+1] = nVert-1; /* repeat first slice's idx for closing off shape */
/* draw */
- fghDrawGeometrySolid(vertices,normals,stripIdx,nVert,stacks+2,(slices+1)*2);
+ fghDrawGeometrySolid(vertices,normals,NULL,nVert,stripIdx,stacks+2,(slices+1)*2);
/* cleanup allocated memory */
free(stripIdx);
free(normals);
}
-static void fghTorus( double dInnerRadius, double dOuterRadius, GLint nSides, GLint nRings, GLboolean useWireMode )
+static void fghTorus( GLfloat dInnerRadius, GLfloat dOuterRadius, GLint nSides, GLint nRings, GLboolean useWireMode )
{
int i,j,idx, nVert;
GLfloat *vertices, *normals;
/* Generate vertices and normals */
- fghGenerateTorus((GLfloat)dInnerRadius,(GLfloat)dOuterRadius,nSides,nRings, &vertices,&normals,&nVert);
+ fghGenerateTorus(dInnerRadius,dOuterRadius,nSides,nRings, &vertices,&normals,&nVert);
if (nVert==0)
/* nothing to draw */
}
/* draw */
- fghDrawGeometrySolid(vertices,normals,stripIdx,nVert,nSides,(nRings+1)*2);
+ fghDrawGeometrySolid(vertices,normals,NULL,nVert,stripIdx,nSides,(nRings+1)*2);
/* cleanup allocated memory */
free(stripIdx);
void FGAPIENTRY glutSolidSphere(double radius, GLint slices, GLint stacks)
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSphere" );
-
- fghSphere( radius, slices, stacks, FALSE );
+ fghSphere((GLfloat)radius, slices, stacks, GL_FALSE );
}
/*
void FGAPIENTRY glutWireSphere(double radius, GLint slices, GLint stacks)
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSphere" );
-
- fghSphere( radius, slices, stacks, TRUE );
+ fghSphere((GLfloat)radius, slices, stacks, GL_TRUE );
}
void FGAPIENTRY glutSolidCone( double base, double height, GLint slices, GLint stacks )
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCone" );
-
- fghCone( base, height, slices, stacks, FALSE );
+ fghCone((GLfloat)base, (GLfloat)height, slices, stacks, GL_FALSE );
}
/*
void FGAPIENTRY glutWireCone( double base, double height, GLint slices, GLint stacks)
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCone" );
-
- fghCone( base, height, slices, stacks, TRUE );
+ fghCone((GLfloat)base, (GLfloat)height, slices, stacks, GL_TRUE );
}
void FGAPIENTRY glutSolidCylinder(double radius, double height, GLint slices, GLint stacks)
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCylinder" );
-
- fghCylinder( radius, height, slices, stacks, FALSE );
+ fghCylinder((GLfloat)radius, (GLfloat)height, slices, stacks, GL_FALSE );
}
/*
void FGAPIENTRY glutWireCylinder(double radius, double height, GLint slices, GLint stacks)
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCylinder" );
-
- fghCylinder( radius, height, slices, stacks, TRUE );
+ fghCylinder((GLfloat)radius, (GLfloat)height, slices, stacks, GL_TRUE );
}
/*
void FGAPIENTRY glutWireTorus( double dInnerRadius, double dOuterRadius, GLint nSides, GLint nRings )
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireTorus" );
-
- fghTorus(dInnerRadius, dOuterRadius, nSides, nRings, TRUE);
+ fghTorus((GLfloat)dInnerRadius, (GLfloat)dOuterRadius, nSides, nRings, GL_TRUE);
}
/*
void FGAPIENTRY glutSolidTorus( double dInnerRadius, double dOuterRadius, GLint nSides, GLint nRings )
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidTorus" );
-
- fghTorus(dInnerRadius, dOuterRadius, nSides, nRings, FALSE);
+ fghTorus((GLfloat)dInnerRadius, (GLfloat)dOuterRadius, nSides, nRings, GL_FALSE);
}
void FGAPIENTRY glutWire##nameICaps( void )\
{\
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWire"#nameICaps );\
- fgh##nameICaps( TRUE );\
+ fgh##nameICaps( GL_TRUE );\
}\
void FGAPIENTRY glutSolid##nameICaps( void )\
{\
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolid"#nameICaps );\
- fgh##nameICaps( FALSE );\
+ fgh##nameICaps( GL_FALSE );\
}
void FGAPIENTRY glutWireCube( double dSize )
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCube" );
- fghCube( (GLfloat)dSize, TRUE );
+ fghCube( (GLfloat)dSize, GL_TRUE );
}
void FGAPIENTRY glutSolidCube( double dSize )
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCube" );
- fghCube( (GLfloat)dSize, FALSE );
+ fghCube( (GLfloat)dSize, GL_FALSE );
}
DECLARE_SHAPE_INTERFACE(Dodecahedron)
void FGAPIENTRY glutWireSierpinskiSponge ( int num_levels, double offset[3], double scale )
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSierpinskiSponge" );
- fghSierpinskiSponge ( num_levels, offset, (GLfloat)scale, TRUE );
+ fghSierpinskiSponge ( num_levels, offset, (GLfloat)scale, GL_TRUE );
}
void FGAPIENTRY glutSolidSierpinskiSponge ( int num_levels, double offset[3], double scale )
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSierpinskiSponge" );
- fghSierpinskiSponge ( num_levels, offset, (GLfloat)scale, FALSE );
+ fghSierpinskiSponge ( num_levels, offset, (GLfloat)scale, GL_FALSE );
}
DECLARE_SHAPE_INTERFACE(Tetrahedron)
projects / freeglut / blobdiff