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标题: [原创代码] [Perl]使用 POGL Shader 实现高效渲染 Julia集动画 [打印本页]

作者: 523066680 时间: 2017-7-24 15:16 标题: [Perl]使用 POGL Shader 实现高效渲染 Julia集动画

本帖最后由 523066680 于 2017-7-24 15:32 编辑

推荐 Perl 环境：5.24 Portable Edition
官方链接：Strawberry Perl Releases

Portable 版环境配置说明：Strawberry Perl 环境配置以及版本推荐

需要安装的模块：
https://metacpan.org/release/OpenGL
https://metacpan.org/pod/OpenGL::Shader

PDL版本的Strawberry Perl 虽然自带OPENGL模块，但是加载 Shader 有问题，最好下载源码包重新编译安装。

=info
Auth:523066680
Date:2017-07
https://www.shadertoy.com/view/ld2fzw

按 '[' 和 ']' 调整阀值，按 - 和 = 调整迭代深度
空格键 - 暂停/继续
q or Q - 退出
=cut

use OpenGL qw/ :all /;
use OpenGL::Config;
use OpenGL::Shader;
use Time::HiRes 'sleep';
use feature 'state';
use IO::Handle;
STDOUT->autoflush(1);

our $ang = 0.0;
our $iter = 1000.0;
our $test = 80.0;
our ($cx, $cy);
our $vTest;
our $vIter;
our $vC;

our $PAUSE = 0;

&Main();

sub display
{
glClear(GL_COLOR_BUFFER_BIT);
glDrawArrays(GL_POINTS, 0, 1);
glutSwapBuffers();
}

sub idle
{
sleep 0.03;

$ang += 0.05 if ($PAUSE == 0);
$cx = cos($ang);
$cy = sin($ang);

glVertexAttrib2fARB($vC, $cx, $cy);

glutPostRedisplay();
}

sub init
{
glClearColor(0.0, 0.0, 0.0, 1.0);
my $shdr = new OpenGL::Shader('GLSL');
my $ver = $shdr->GetVersion();
my $stat = $shdr->Load( frag_Shader(), vert_Shader() );
$shdr->Enable();

#如果 shader 编译不成功，错误信息会返回到 $stat
print "$stat $ver\n";
glPointSize(480.0);

$vTest = $shdr->MapAttr('vTest');
$vIter = $shdr->MapAttr('vIter');
$vC = $shdr->MapAttr('vC');

glVertexAttrib1fARB($vTest, $test);
glVertexAttrib1fARB($vIter, $iter);
glVertexAttrib2fARB($vC, $cx, $cy);
}

sub hitkey
{
my $key = shift;
my $char = chr($key);

if ( lc($char) eq 'q' ) { glutDestroyWindow($WinID) }
elsif ($char eq '[')  { $test -= 1.0 if ( $test > 1.0 ) }
elsif ($char eq ']')  { $test += 1.0 }
elsif ($char eq '-')  { $iter -= $iter*0.2 if ( $iter > 1.0 ) }
elsif ($char eq '=')  { $iter += $iter*0.2  }
elsif ($char eq ' ')  { $PAUSE = 1 - $PAUSE }

printf("test: %.2f, iter: %.2f\n", $test, $iter );
glVertexAttrib1fARB($vTest, $test);
glVertexAttrib1fARB($vIter, $iter);
}

sub Main
{
glutInit();
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE );
glutInitWindowSize(500, 500);
glutInitWindowPosition(1,1);
our $WinID = glutCreateWindow("title");
&init();
glutDisplayFunc(\&display);
glutKeyboardFunc(\&hitkey);
glutIdleFunc(\&idle);
glutMainLoop();
}

sub frag_Shader
{
return '
varying float fTest;
varying float fIter;
varying vec2 fC;

void main(void)
{
      vec2 coord = (gl_FragCoord.xy - 250.0) / 100.0;

      vec4 color;
      vec2 C = fC;
      vec2 Z = coord.xy;

      int iterations = 0;
      int max_iterations = int(fIter);

      float rate;
      float threshold_squared = fTest;

      while ( (iterations < max_iterations) && (dot(Z, Z) < threshold_squared) )
      {
         vec2 tZ;
         tZ.x = Z.x * Z.x - Z.y * Z.y + C.x;
         tZ.y = Z.x * Z.y * 2.0 + C.y;
         Z = tZ;
         iterations++;
      }

      if (iterations == max_iterations)
      {
         color = vec4(0.3, 0.1, 0.1, 1.0);
      }
      else
      {
         rate =  float(iterations)/float(max_iterations)*100.0;
         //color = vec4(rate, rate, rate, 1.0);  //default color
         color = vec4(rate, smoothstep(exp(Z.x), 0.0, 0.5), rate, 1.0);
      }

      gl_FragColor = color;
}
'
}

sub vert_Shader
{
return '
attribute float vTest;
attribute float vIter;
attribute vec2 vC;

varying float fTest;
varying float fIter;
varying vec2 fC;

void main(void)
{
      fTest = vTest;
      fIter = vIter;
      fC = vC;

      gl_Position = vec4(0.0, 0.0, 0.0, 1.0);
}
';
}

[Finished in 0.3s]

作者: 523066680 时间: 2017-7-25 11:12

本帖最后由 523066680 于 2017-7-25 11:14 编辑

Sharp

迭代公式：
uZ.x = exp(tZ.x) * cos(tZ.y) * C.x;
uZ.y = exp(tZ.x) * sin(tZ.y) * C.y;

Julia之眼

迭代公式：
tZ.x = Z.x * Z.x - Z.y * Z.y + C.x;
tZ.y = Z.x * Z.y * 2.0 + C.y;
着色：
color = vec4(rate, exp(Z.x), rate, 1.0);

机械臂

tZ.x = Z.x * Z.x - Z.y * Z.y + C.x;
tZ.y = Z.x * Z.y * 1.0 + C.y;
着色：
color = vec4(rate, exp(Z.x), rate, 1.0);

图腾

Z=Z^3+C

浩瀚

旋转的阶梯

作者: 523066680 时间: 2017-7-25 11:19

Colorful

Mandbrot: Z=Z^4+C

作者: happy886rr 时间: 2017-7-25 12:46

回复 3# 523066680
应该整理成屏保发布出来。

作者: 老刘1号 时间: 2017-7-25 12:52

回复 4# happy886rr

如果搞成屏保，那绝对霸气侧漏啊

作者: 523066680 时间: 2017-7-25 16:07

本帖最后由 523066680 于 2017-7-25 16:37 编辑

回复 4# happy886rr

已上传 Win32 版本，支持全屏
http://523066680.ys168.com/
目录：OpenGL/2017年作品

不知道能不能正常运行，最好是有 Nvidia 显卡。 GT630测试可以
-
按键

    [ or ]  -> threshold_squared
    9 or 0  -> max_iteration
    - or =  -> scale

    w a s d -> move
    f       -> fullscreen/leave fullscreen
   空格键 -> 暂停
复制代码

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