+ if(cmesh_indexed(cm)) {
+ if(!(indices = cmesh_index(cm))) {
+ return;
+ }
+ idxnum = cmesh_index_count(cm);
+ for(i=0; i<idxnum; i+=3) {
+ unsigned int tmp = indices[i + 2];
+ indices[i + 2] = indices[i + 1];
+ indices[i + 1] = tmp;
+ }
+ } else {
+ if(!(verts = cmesh_attrib(cm, CMESH_ATTR_VERTEX))) {
+ return;
+ }
+ vnum = cmesh_attrib_count(cm, CMESH_ATTR_VERTEX);
+ nelem = cm->vattr[CMESH_ATTR_VERTEX].nelem;
+ for(i=0; i<vnum; i+=3) {
+ for(j=0; j<nelem; j++) {
+ vptr = verts + (i + 1) * nelem + j;
+ float tmp = vptr[nelem];
+ vptr[nelem] = vptr[0];
+ vptr[0] = tmp;
+ }
+ }
+ }
+}
+void cmesh_flip_normals(struct cmesh *cm)
+{
+ int i, num;
+ float *nptr = cmesh_attrib(cm, CMESH_ATTR_NORMAL);
+ if(!nptr) return;
+
+ num = cm->nverts * cm->vattr[CMESH_ATTR_NORMAL].nelem;
+ for(i=0; i<num; i++) {
+ *nptr = -*nptr;
+ nptr++;
+ }
+}
+
+int cmesh_explode(struct cmesh *cm)
+{
+ int i, j, k, idxnum, nnverts;
+ unsigned int *indices;
+
+ if(!cmesh_indexed(cm)) return 0;
+
+ indices = cmesh_index(cm);
+ assert(indices);
+
+ idxnum = cmesh_index_count(cm);
+ nnverts = idxnum;
+
+ for(i=0; i<CMESH_NUM_ATTR; i++) {
+ const float *srcbuf;
+ float *tmpbuf, *dstptr;
+
+ if(!cmesh_has_attrib(cm, i)) continue;
+
+ srcbuf = cmesh_attrib(cm, i);
+ if(!(tmpbuf = malloc(nnverts * cm->vattr[i].nelem * sizeof(float)))) {
+ return -1;
+ }
+ dstptr = tmpbuf;
+
+ for(j=0; j<idxnum; j++) {
+ unsigned int idx = indices[j];
+ const float *srcptr = srcbuf + idx * cm->vattr[i].nelem;
+
+ for(k=0; k<cm->vattr[i].nelem; k++) {
+ *dstptr++ = *srcptr++;
+ }
+ }
+
+ free(cm->vattr[i].data);
+ cm->vattr[i].data = tmpbuf;
+ cm->vattr[i].count = nnverts * cm->vattr[i].nelem;
+ cm->vattr[i].data_valid = 1;
+ }
+
+ cm->ibo_valid = 0;
+ cm->idata_valid = 0;
+ free(cm->idata);
+ cm->idata = 0;
+ cm->icount = 0;
+
+ cm->nverts = nnverts;
+ cm->nfaces = idxnum / 3;
+ return 0;
+}
+
+void cmesh_calc_face_normals(struct cmesh *cm)
+{
+ /* TODO */
+}
+
+static int pre_draw(struct cmesh *cm)
+{
+ int i, loc, cur_sdr;
+
+ glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
+
+ update_buffers(cm);
+
+ if(!cm->vattr[CMESH_ATTR_VERTEX].vbo_valid) {
+ return -1;
+ }
+
+ if(cur_sdr && use_custom_sdr_attr) {
+ if(sdr_loc[CMESH_ATTR_VERTEX] == -1) {
+ return -1;
+ }
+
+ for(i=0; i<CMESH_NUM_ATTR; i++) {
+ loc = sdr_loc[i];
+ if(loc >= 0 && cm->vattr[i].vbo_valid) {
+ glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[i].vbo);
+ glVertexAttribPointer(loc, cm->vattr[i].nelem, GL_FLOAT, GL_FALSE, 0, 0);
+ glEnableVertexAttribArray(loc);
+ }
+ }
+ } else {
+#ifndef GL_ES_VERSION_2_0
+ glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_VERTEX].vbo);
+ glVertexPointer(cm->vattr[CMESH_ATTR_VERTEX].nelem, GL_FLOAT, 0, 0);
+ glEnableClientState(GL_VERTEX_ARRAY);
+
+ if(cm->vattr[CMESH_ATTR_NORMAL].vbo_valid) {
+ glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_NORMAL].vbo);
+ glNormalPointer(GL_FLOAT, 0, 0);
+ glEnableClientState(GL_NORMAL_ARRAY);
+ }
+ if(cm->vattr[CMESH_ATTR_TEXCOORD].vbo_valid) {
+ glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_TEXCOORD].vbo);
+ glTexCoordPointer(cm->vattr[CMESH_ATTR_TEXCOORD].nelem, GL_FLOAT, 0, 0);
+ glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+ }
+ if(cm->vattr[CMESH_ATTR_COLOR].vbo_valid) {
+ glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_COLOR].vbo);
+ glColorPointer(cm->vattr[CMESH_ATTR_COLOR].nelem, GL_FLOAT, 0, 0);
+ glEnableClientState(GL_COLOR_ARRAY);
+ }
+ if(cm->vattr[CMESH_ATTR_TEXCOORD2].vbo_valid) {
+ glClientActiveTexture(GL_TEXTURE1);
+ glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_TEXCOORD2].vbo);
+ glTexCoordPointer(cm->vattr[CMESH_ATTR_TEXCOORD2].nelem, GL_FLOAT, 0, 0);
+ glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+ glClientActiveTexture(GL_TEXTURE0);
+ }
+#endif /* GL_ES_VERSION_2_0 */
+ }
+ glBindBuffer(GL_ARRAY_BUFFER, 0);
+ return cur_sdr;
+}
+
+void cmesh_draw(struct cmesh *cm)
+{
+ int cur_sdr;
+
+ if((cur_sdr = pre_draw(cm)) == -1) {
+ return;
+ }
+
+ if(cm->ibo_valid) {
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->ibo);
+ glDrawElements(GL_TRIANGLES, cm->nfaces * 3, GL_UNSIGNED_INT, 0);
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+ } else {
+ glDrawArrays(GL_TRIANGLES, 0, cm->nverts);
+ }
+
+ post_draw(cm, cur_sdr);
+}
+
+static void post_draw(struct cmesh *cm, int cur_sdr)
+{
+ int i;
+
+ if(cur_sdr && use_custom_sdr_attr) {
+ for(i=0; i<CMESH_NUM_ATTR; i++) {
+ int loc = sdr_loc[i];
+ if(loc >= 0 && cm->vattr[i].vbo_valid) {
+ glDisableVertexAttribArray(loc);
+ }
+ }
+ } else {
+#ifndef GL_ES_VERSION_2_0
+ glDisableClientState(GL_VERTEX_ARRAY);
+ if(cm->vattr[CMESH_ATTR_NORMAL].vbo_valid) {
+ glDisableClientState(GL_NORMAL_ARRAY);
+ }
+ if(cm->vattr[CMESH_ATTR_TEXCOORD].vbo_valid) {
+ glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+ }
+ if(cm->vattr[CMESH_ATTR_COLOR].vbo_valid) {
+ glDisableClientState(GL_COLOR_ARRAY);
+ }
+ if(cm->vattr[CMESH_ATTR_TEXCOORD2].vbo_valid) {
+ glClientActiveTexture(GL_TEXTURE1);
+ glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+ glClientActiveTexture(GL_TEXTURE0);
+ }
+#endif /* GL_ES_VERSION_2_0 */
+ }
+}
+
+void cmesh_draw_wire(struct cmesh *cm, float linesz)
+{
+ int cur_sdr, nfaces;
+
+ if((cur_sdr = pre_draw(cm)) == -1) {
+ return;
+ }
+ update_wire_ibo(cm);
+
+ nfaces = cmesh_poly_count(cm);
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->wire_ibo);
+ glDrawElements(GL_LINES, nfaces * 6, GL_UNSIGNED_INT, 0);
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+
+ post_draw(cm, cur_sdr);
+}
+
+void cmesh_draw_vertices(struct cmesh *cm, float ptsz)
+{
+ int cur_sdr;
+ if((cur_sdr = pre_draw(cm)) == -1) {
+ return;
+ }
+
+ glPushAttrib(GL_POINT_BIT);
+ glPointSize(ptsz);
+ glDrawArrays(GL_POINTS, 0, cm->nverts);
+ glPopAttrib();