Pablo Dobarro
4a373afa5f
This brush has a simple physics solver that helps when sculpting cloth. - The mass and the damping properties of the simulation are properties of the brush. - It has two additional radius control to limit the influence and falloff of the simulation. - Masked vertices are pinned in the simulation, and it applies the sculpt gravity directly in the solver. - The Cloth Brush has 7 deformation modes with 2 falloff types (radial and plane). The brush can create the constraints only on the required PBVH nodes, so the simulation is isolated on high poly meshes. As long as the brush size is not too big it should be possible to keep it real time. Known issues: - The way constraints are created is extremely basic and it creates repeated constraints. Maybe there is another way to create fewer constraints while keeping the simulation quality decent. This part can also be multithreaded. (As it is it works ok, but it could be better) Reviewed By: jbakker Differential Revision: https://developer.blender.org/D6715
557 lines
17 KiB
C
557 lines
17 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
/** \file
|
|
* \ingroup gpu
|
|
*
|
|
* GPU immediate mode drawing utilities
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "BLI_utildefines.h"
|
|
#include "BLI_math.h"
|
|
|
|
#include "GPU_immediate.h"
|
|
#include "GPU_immediate_util.h"
|
|
|
|
static const float cube_coords[8][3] = {
|
|
{-1, -1, -1},
|
|
{-1, -1, +1},
|
|
{-1, +1, -1},
|
|
{-1, +1, +1},
|
|
{+1, -1, -1},
|
|
{+1, -1, +1},
|
|
{+1, +1, -1},
|
|
{+1, +1, +1},
|
|
};
|
|
static const int cube_quad_index[6][4] = {
|
|
{0, 1, 3, 2},
|
|
{0, 2, 6, 4},
|
|
{0, 4, 5, 1},
|
|
{1, 5, 7, 3},
|
|
{2, 3, 7, 6},
|
|
{4, 6, 7, 5},
|
|
};
|
|
static const int cube_line_index[12][2] = {
|
|
{0, 1},
|
|
{0, 2},
|
|
{0, 4},
|
|
{1, 3},
|
|
{1, 5},
|
|
{2, 3},
|
|
{2, 6},
|
|
{3, 7},
|
|
{4, 5},
|
|
{4, 6},
|
|
{5, 7},
|
|
{6, 7},
|
|
};
|
|
|
|
void immRectf(uint pos, float x1, float y1, float x2, float y2)
|
|
{
|
|
immBegin(GPU_PRIM_TRI_FAN, 4);
|
|
immVertex2f(pos, x1, y1);
|
|
immVertex2f(pos, x2, y1);
|
|
immVertex2f(pos, x2, y2);
|
|
immVertex2f(pos, x1, y2);
|
|
immEnd();
|
|
}
|
|
|
|
void immRecti(uint pos, int x1, int y1, int x2, int y2)
|
|
{
|
|
immBegin(GPU_PRIM_TRI_FAN, 4);
|
|
immVertex2i(pos, x1, y1);
|
|
immVertex2i(pos, x2, y1);
|
|
immVertex2i(pos, x2, y2);
|
|
immVertex2i(pos, x1, y2);
|
|
immEnd();
|
|
}
|
|
|
|
void immRectf_fast(uint pos, float x1, float y1, float x2, float y2)
|
|
{
|
|
immVertex2f(pos, x1, y1);
|
|
immVertex2f(pos, x2, y1);
|
|
immVertex2f(pos, x2, y2);
|
|
|
|
immVertex2f(pos, x1, y1);
|
|
immVertex2f(pos, x2, y2);
|
|
immVertex2f(pos, x1, y2);
|
|
}
|
|
|
|
void immRectf_fast_with_color(
|
|
uint pos, uint col, float x1, float y1, float x2, float y2, const float color[4])
|
|
{
|
|
immAttr4fv(col, color);
|
|
immVertex2f(pos, x1, y1);
|
|
immAttr4fv(col, color);
|
|
immVertex2f(pos, x2, y1);
|
|
immAttr4fv(col, color);
|
|
immVertex2f(pos, x2, y2);
|
|
|
|
immAttr4fv(col, color);
|
|
immVertex2f(pos, x1, y1);
|
|
immAttr4fv(col, color);
|
|
immVertex2f(pos, x2, y2);
|
|
immAttr4fv(col, color);
|
|
immVertex2f(pos, x1, y2);
|
|
}
|
|
|
|
void immRecti_fast_with_color(
|
|
uint pos, uint col, int x1, int y1, int x2, int y2, const float color[4])
|
|
{
|
|
immAttr4fv(col, color);
|
|
immVertex2i(pos, x1, y1);
|
|
immAttr4fv(col, color);
|
|
immVertex2i(pos, x2, y1);
|
|
immAttr4fv(col, color);
|
|
immVertex2i(pos, x2, y2);
|
|
|
|
immAttr4fv(col, color);
|
|
immVertex2i(pos, x1, y1);
|
|
immAttr4fv(col, color);
|
|
immVertex2i(pos, x2, y2);
|
|
immAttr4fv(col, color);
|
|
immVertex2i(pos, x1, y2);
|
|
}
|
|
|
|
#if 0 /* more complete version in case we want that */
|
|
void immRecti_complete(int x1, int y1, int x2, int y2, const float color[4])
|
|
{
|
|
GPUVertFormat *format = immVertexFormat();
|
|
uint pos = add_attr(format, "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
|
|
immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
|
|
immUniformColor4fv(color);
|
|
immRecti(pos, x1, y1, x2, y2);
|
|
immUnbindProgram();
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* Pack color into 3 bytes
|
|
*
|
|
* This define converts a numerical value to the equivalent 24-bit
|
|
* color, while not being endian-sensitive. On little-endian, this
|
|
* is the same as doing a 'naive' indexing, on big-endian, it is not!
|
|
*
|
|
* \note BGR format (i.e. 0xBBGGRR)...
|
|
*
|
|
* \param x: color.
|
|
*/
|
|
void imm_cpack(uint x)
|
|
{
|
|
immUniformColor3ub(((x)&0xFF), (((x) >> 8) & 0xFF), (((x) >> 16) & 0xFF));
|
|
}
|
|
|
|
static void imm_draw_circle(GPUPrimType prim_type,
|
|
const uint shdr_pos,
|
|
float x,
|
|
float y,
|
|
float rad_x,
|
|
float rad_y,
|
|
int nsegments)
|
|
{
|
|
immBegin(prim_type, nsegments);
|
|
for (int i = 0; i < nsegments; i++) {
|
|
const float angle = (float)(2 * M_PI) * ((float)i / (float)nsegments);
|
|
immVertex2f(shdr_pos, x + (rad_x * cosf(angle)), y + (rad_y * sinf(angle)));
|
|
}
|
|
immEnd();
|
|
}
|
|
|
|
/**
|
|
* Draw a circle outline with the given \a radius.
|
|
* The circle is centered at \a x, \a y and drawn in the XY plane.
|
|
*
|
|
* \param shdr_pos: The vertex attribute number for position.
|
|
* \param x: Horizontal center.
|
|
* \param y: Vertical center.
|
|
* \param rad: The circle's radius.
|
|
* \param nsegments: The number of segments to use in drawing (more = smoother).
|
|
*/
|
|
void imm_draw_circle_wire_2d(uint shdr_pos, float x, float y, float rad, int nsegments)
|
|
{
|
|
imm_draw_circle(GPU_PRIM_LINE_LOOP, shdr_pos, x, y, rad, rad, nsegments);
|
|
}
|
|
|
|
/**
|
|
* Draw a filled circle with the given \a radius.
|
|
* The circle is centered at \a x, \a y and drawn in the XY plane.
|
|
*
|
|
* \param shdr_pos: The vertex attribute number for position.
|
|
* \param x: Horizontal center.
|
|
* \param y: Vertical center.
|
|
* \param rad: The circle's radius.
|
|
* \param nsegments: The number of segments to use in drawing (more = smoother).
|
|
*/
|
|
void imm_draw_circle_fill_2d(uint shdr_pos, float x, float y, float rad, int nsegments)
|
|
{
|
|
imm_draw_circle(GPU_PRIM_TRI_FAN, shdr_pos, x, y, rad, rad, nsegments);
|
|
}
|
|
|
|
void imm_draw_circle_wire_aspect_2d(
|
|
uint shdr_pos, float x, float y, float rad_x, float rad_y, int nsegments)
|
|
{
|
|
imm_draw_circle(GPU_PRIM_LINE_LOOP, shdr_pos, x, y, rad_x, rad_y, nsegments);
|
|
}
|
|
void imm_draw_circle_fill_aspect_2d(
|
|
uint shdr_pos, float x, float y, float rad_x, float rad_y, int nsegments)
|
|
{
|
|
imm_draw_circle(GPU_PRIM_TRI_FAN, shdr_pos, x, y, rad_x, rad_y, nsegments);
|
|
}
|
|
|
|
static void imm_draw_circle_partial(GPUPrimType prim_type,
|
|
uint pos,
|
|
float x,
|
|
float y,
|
|
float rad,
|
|
int nsegments,
|
|
float start,
|
|
float sweep)
|
|
{
|
|
/* shift & reverse angle, increase 'nsegments' to match gluPartialDisk */
|
|
const float angle_start = -(DEG2RADF(start)) + (float)(M_PI / 2);
|
|
const float angle_end = -(DEG2RADF(sweep) - angle_start);
|
|
nsegments += 1;
|
|
immBegin(prim_type, nsegments);
|
|
for (int i = 0; i < nsegments; i++) {
|
|
const float angle = interpf(angle_start, angle_end, ((float)i / (float)(nsegments - 1)));
|
|
const float angle_sin = sinf(angle);
|
|
const float angle_cos = cosf(angle);
|
|
immVertex2f(pos, x + rad * angle_cos, y + rad * angle_sin);
|
|
}
|
|
immEnd();
|
|
}
|
|
|
|
void imm_draw_circle_partial_wire_2d(
|
|
uint pos, float x, float y, float rad, int nsegments, float start, float sweep)
|
|
{
|
|
imm_draw_circle_partial(GPU_PRIM_LINE_STRIP, pos, x, y, rad, nsegments, start, sweep);
|
|
}
|
|
|
|
static void imm_draw_disk_partial(GPUPrimType prim_type,
|
|
uint pos,
|
|
float x,
|
|
float y,
|
|
float rad_inner,
|
|
float rad_outer,
|
|
int nsegments,
|
|
float start,
|
|
float sweep)
|
|
{
|
|
/* to avoid artifacts */
|
|
const float max_angle = 3 * 360;
|
|
CLAMP(sweep, -max_angle, max_angle);
|
|
|
|
/* shift & reverse angle, increase 'nsegments' to match gluPartialDisk */
|
|
const float angle_start = -(DEG2RADF(start)) + (float)(M_PI / 2);
|
|
const float angle_end = -(DEG2RADF(sweep) - angle_start);
|
|
nsegments += 1;
|
|
immBegin(prim_type, nsegments * 2);
|
|
for (int i = 0; i < nsegments; i++) {
|
|
const float angle = interpf(angle_start, angle_end, ((float)i / (float)(nsegments - 1)));
|
|
const float angle_sin = sinf(angle);
|
|
const float angle_cos = cosf(angle);
|
|
immVertex2f(pos, x + rad_inner * angle_cos, y + rad_inner * angle_sin);
|
|
immVertex2f(pos, x + rad_outer * angle_cos, y + rad_outer * angle_sin);
|
|
}
|
|
immEnd();
|
|
}
|
|
|
|
/**
|
|
* Draw a filled arc with the given inner and outer radius.
|
|
* The circle is centered at \a x, \a y and drawn in the XY plane.
|
|
*
|
|
* \note Arguments are `gluPartialDisk` compatible.
|
|
*
|
|
* \param pos: The vertex attribute number for position.
|
|
* \param x: Horizontal center.
|
|
* \param y: Vertical center.
|
|
* \param rad_inner: The inner circle's radius.
|
|
* \param rad_outer: The outer circle's radius (can be zero).
|
|
* \param nsegments: The number of segments to use in drawing (more = smoother).
|
|
* \param start: Specifies the starting angle, in degrees, of the disk portion.
|
|
* \param sweep: Specifies the sweep angle, in degrees, of the disk portion.
|
|
*/
|
|
void imm_draw_disk_partial_fill_2d(uint pos,
|
|
float x,
|
|
float y,
|
|
float rad_inner,
|
|
float rad_outer,
|
|
int nsegments,
|
|
float start,
|
|
float sweep)
|
|
{
|
|
imm_draw_disk_partial(
|
|
GPU_PRIM_TRI_STRIP, pos, x, y, rad_inner, rad_outer, nsegments, start, sweep);
|
|
}
|
|
|
|
static void imm_draw_circle_3D(
|
|
GPUPrimType prim_type, uint pos, float x, float y, float rad, int nsegments)
|
|
{
|
|
immBegin(prim_type, nsegments);
|
|
for (int i = 0; i < nsegments; i++) {
|
|
float angle = (float)(2 * M_PI) * ((float)i / (float)nsegments);
|
|
immVertex3f(pos, x + rad * cosf(angle), y + rad * sinf(angle), 0.0f);
|
|
}
|
|
immEnd();
|
|
}
|
|
|
|
void imm_draw_circle_wire_3d(uint pos, float x, float y, float rad, int nsegments)
|
|
{
|
|
imm_draw_circle_3D(GPU_PRIM_LINE_LOOP, pos, x, y, rad, nsegments);
|
|
}
|
|
|
|
void imm_draw_circle_dashed_3d(uint pos, float x, float y, float rad, int nsegments)
|
|
{
|
|
imm_draw_circle_3D(GPU_PRIM_LINES, pos, x, y, rad, nsegments / 2);
|
|
}
|
|
|
|
void imm_draw_circle_fill_3d(uint pos, float x, float y, float rad, int nsegments)
|
|
{
|
|
imm_draw_circle_3D(GPU_PRIM_TRI_FAN, pos, x, y, rad, nsegments);
|
|
}
|
|
|
|
/**
|
|
* Draw a lined box.
|
|
*
|
|
* \param pos: The vertex attribute number for position.
|
|
* \param x1: left.
|
|
* \param y1: bottom.
|
|
* \param x2: right.
|
|
* \param y2: top.
|
|
*/
|
|
void imm_draw_box_wire_2d(uint pos, float x1, float y1, float x2, float y2)
|
|
{
|
|
immBegin(GPU_PRIM_LINE_LOOP, 4);
|
|
immVertex2f(pos, x1, y1);
|
|
immVertex2f(pos, x1, y2);
|
|
immVertex2f(pos, x2, y2);
|
|
immVertex2f(pos, x2, y1);
|
|
immEnd();
|
|
}
|
|
|
|
void imm_draw_box_wire_3d(uint pos, float x1, float y1, float x2, float y2)
|
|
{
|
|
/* use this version when GPUVertFormat has a vec3 position */
|
|
immBegin(GPU_PRIM_LINE_LOOP, 4);
|
|
immVertex3f(pos, x1, y1, 0.0f);
|
|
immVertex3f(pos, x1, y2, 0.0f);
|
|
immVertex3f(pos, x2, y2, 0.0f);
|
|
immVertex3f(pos, x2, y1, 0.0f);
|
|
immEnd();
|
|
}
|
|
|
|
/**
|
|
* Draw a standard checkerboard to indicate transparent backgrounds.
|
|
*/
|
|
void imm_draw_box_checker_2d(float x1, float y1, float x2, float y2)
|
|
{
|
|
uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
|
|
immBindBuiltinProgram(GPU_SHADER_2D_CHECKER);
|
|
|
|
immUniform4f("color1", 0.15f, 0.15f, 0.15f, 1.0f);
|
|
immUniform4f("color2", 0.2f, 0.2f, 0.2f, 1.0f);
|
|
immUniform1i("size", 8);
|
|
|
|
immRectf(pos, x1, y1, x2, y2);
|
|
|
|
immUnbindProgram();
|
|
}
|
|
|
|
void imm_draw_cube_fill_3d(uint pos, const float co[3], const float aspect[3])
|
|
{
|
|
float coords[ARRAY_SIZE(cube_coords)][3];
|
|
|
|
for (int i = 0; i < ARRAY_SIZE(cube_coords); i++) {
|
|
madd_v3_v3v3v3(coords[i], co, cube_coords[i], aspect);
|
|
}
|
|
|
|
immBegin(GPU_PRIM_TRIS, ARRAY_SIZE(cube_quad_index) * 3 * 2);
|
|
for (int i = 0; i < ARRAY_SIZE(cube_quad_index); i++) {
|
|
immVertex3fv(pos, coords[cube_quad_index[i][0]]);
|
|
immVertex3fv(pos, coords[cube_quad_index[i][1]]);
|
|
immVertex3fv(pos, coords[cube_quad_index[i][2]]);
|
|
|
|
immVertex3fv(pos, coords[cube_quad_index[i][0]]);
|
|
immVertex3fv(pos, coords[cube_quad_index[i][2]]);
|
|
immVertex3fv(pos, coords[cube_quad_index[i][3]]);
|
|
}
|
|
immEnd();
|
|
}
|
|
|
|
void imm_draw_cube_wire_3d(uint pos, const float co[3], const float aspect[3])
|
|
{
|
|
float coords[ARRAY_SIZE(cube_coords)][3];
|
|
|
|
for (int i = 0; i < ARRAY_SIZE(cube_coords); i++) {
|
|
madd_v3_v3v3v3(coords[i], co, cube_coords[i], aspect);
|
|
}
|
|
|
|
immBegin(GPU_PRIM_LINES, ARRAY_SIZE(cube_line_index) * 2);
|
|
for (int i = 0; i < ARRAY_SIZE(cube_line_index); i++) {
|
|
immVertex3fv(pos, coords[cube_line_index[i][0]]);
|
|
immVertex3fv(pos, coords[cube_line_index[i][1]]);
|
|
}
|
|
immEnd();
|
|
}
|
|
|
|
/**
|
|
* Draw a cylinder. Replacement for gluCylinder.
|
|
* _warning_ : Slow, better use it only if you no other choices.
|
|
*
|
|
* \param pos: The vertex attribute number for position.
|
|
* \param nor: The vertex attribute number for normal.
|
|
* \param base: Specifies the radius of the cylinder at z = 0.
|
|
* \param top: Specifies the radius of the cylinder at z = height.
|
|
* \param height: Specifies the height of the cylinder.
|
|
* \param slices: Specifies the number of subdivisions around the z axis.
|
|
* \param stacks: Specifies the number of subdivisions along the z axis.
|
|
*/
|
|
void imm_draw_cylinder_fill_normal_3d(
|
|
uint pos, uint nor, float base, float top, float height, int slices, int stacks)
|
|
{
|
|
immBegin(GPU_PRIM_TRIS, 6 * slices * stacks);
|
|
for (int i = 0; i < slices; i++) {
|
|
const float angle1 = (float)(2 * M_PI) * ((float)i / (float)slices);
|
|
const float angle2 = (float)(2 * M_PI) * ((float)(i + 1) / (float)slices);
|
|
const float cos1 = cosf(angle1);
|
|
const float sin1 = sinf(angle1);
|
|
const float cos2 = cosf(angle2);
|
|
const float sin2 = sinf(angle2);
|
|
|
|
for (int j = 0; j < stacks; j++) {
|
|
float fac1 = (float)j / (float)stacks;
|
|
float fac2 = (float)(j + 1) / (float)stacks;
|
|
float r1 = base * (1.f - fac1) + top * fac1;
|
|
float r2 = base * (1.f - fac2) + top * fac2;
|
|
float h1 = height * ((float)j / (float)stacks);
|
|
float h2 = height * ((float)(j + 1) / (float)stacks);
|
|
|
|
float v1[3] = {r1 * cos2, r1 * sin2, h1};
|
|
float v2[3] = {r2 * cos2, r2 * sin2, h2};
|
|
float v3[3] = {r2 * cos1, r2 * sin1, h2};
|
|
float v4[3] = {r1 * cos1, r1 * sin1, h1};
|
|
float n1[3], n2[3];
|
|
|
|
/* calc normals */
|
|
sub_v3_v3v3(n1, v2, v1);
|
|
normalize_v3(n1);
|
|
n1[0] = cos1;
|
|
n1[1] = sin1;
|
|
n1[2] = 1 - n1[2];
|
|
|
|
sub_v3_v3v3(n2, v3, v4);
|
|
normalize_v3(n2);
|
|
n2[0] = cos2;
|
|
n2[1] = sin2;
|
|
n2[2] = 1 - n2[2];
|
|
|
|
/* first tri */
|
|
immAttr3fv(nor, n2);
|
|
immVertex3fv(pos, v1);
|
|
immVertex3fv(pos, v2);
|
|
immAttr3fv(nor, n1);
|
|
immVertex3fv(pos, v3);
|
|
|
|
/* second tri */
|
|
immVertex3fv(pos, v3);
|
|
immVertex3fv(pos, v4);
|
|
immAttr3fv(nor, n2);
|
|
immVertex3fv(pos, v1);
|
|
}
|
|
}
|
|
immEnd();
|
|
}
|
|
|
|
void imm_draw_cylinder_wire_3d(
|
|
uint pos, float base, float top, float height, int slices, int stacks)
|
|
{
|
|
immBegin(GPU_PRIM_LINES, 6 * slices * stacks);
|
|
for (int i = 0; i < slices; i++) {
|
|
const float angle1 = (float)(2 * M_PI) * ((float)i / (float)slices);
|
|
const float angle2 = (float)(2 * M_PI) * ((float)(i + 1) / (float)slices);
|
|
const float cos1 = cosf(angle1);
|
|
const float sin1 = sinf(angle1);
|
|
const float cos2 = cosf(angle2);
|
|
const float sin2 = sinf(angle2);
|
|
|
|
for (int j = 0; j < stacks; j++) {
|
|
float fac1 = (float)j / (float)stacks;
|
|
float fac2 = (float)(j + 1) / (float)stacks;
|
|
float r1 = base * (1.f - fac1) + top * fac1;
|
|
float r2 = base * (1.f - fac2) + top * fac2;
|
|
float h1 = height * ((float)j / (float)stacks);
|
|
float h2 = height * ((float)(j + 1) / (float)stacks);
|
|
|
|
float v1[3] = {r1 * cos2, r1 * sin2, h1};
|
|
float v2[3] = {r2 * cos2, r2 * sin2, h2};
|
|
float v3[3] = {r2 * cos1, r2 * sin1, h2};
|
|
float v4[3] = {r1 * cos1, r1 * sin1, h1};
|
|
|
|
immVertex3fv(pos, v1);
|
|
immVertex3fv(pos, v2);
|
|
|
|
immVertex3fv(pos, v2);
|
|
immVertex3fv(pos, v3);
|
|
|
|
immVertex3fv(pos, v1);
|
|
immVertex3fv(pos, v4);
|
|
}
|
|
}
|
|
immEnd();
|
|
}
|
|
|
|
void imm_draw_cylinder_fill_3d(
|
|
uint pos, float base, float top, float height, int slices, int stacks)
|
|
{
|
|
immBegin(GPU_PRIM_TRIS, 6 * slices * stacks);
|
|
for (int i = 0; i < slices; i++) {
|
|
const float angle1 = (float)(2 * M_PI) * ((float)i / (float)slices);
|
|
const float angle2 = (float)(2 * M_PI) * ((float)(i + 1) / (float)slices);
|
|
const float cos1 = cosf(angle1);
|
|
const float sin1 = sinf(angle1);
|
|
const float cos2 = cosf(angle2);
|
|
const float sin2 = sinf(angle2);
|
|
|
|
for (int j = 0; j < stacks; j++) {
|
|
float fac1 = (float)j / (float)stacks;
|
|
float fac2 = (float)(j + 1) / (float)stacks;
|
|
float r1 = base * (1.f - fac1) + top * fac1;
|
|
float r2 = base * (1.f - fac2) + top * fac2;
|
|
float h1 = height * ((float)j / (float)stacks);
|
|
float h2 = height * ((float)(j + 1) / (float)stacks);
|
|
|
|
float v1[3] = {r1 * cos2, r1 * sin2, h1};
|
|
float v2[3] = {r2 * cos2, r2 * sin2, h2};
|
|
float v3[3] = {r2 * cos1, r2 * sin1, h2};
|
|
float v4[3] = {r1 * cos1, r1 * sin1, h1};
|
|
|
|
/* first tri */
|
|
immVertex3fv(pos, v1);
|
|
immVertex3fv(pos, v2);
|
|
immVertex3fv(pos, v3);
|
|
|
|
/* second tri */
|
|
immVertex3fv(pos, v3);
|
|
immVertex3fv(pos, v4);
|
|
immVertex3fv(pos, v1);
|
|
}
|
|
}
|
|
immEnd();
|
|
}
|