64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
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//stencil.cpp
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//draw a covering plane whereever stencil values are !=0, to simulate shadow and light volumes
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#include <OpenGL/gl.h>
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#include "vectors.h"
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#include "environment.h"
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#include "screen.h"
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#include "gamemem.h"
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#include "config.h"
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float gStencilZoom=1.0;
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//draw a covering plane whereever stencil values are !=0
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//if shadow is true draw using shadow color to simulate shadow volumes
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//else draw using spotlight color to simulate light cones.
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void RenderStencilLayer(int shadow,int stencil)
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{
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if(!stencil)
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return;
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glPushAttrib(GL_DEPTH_BUFFER_BIT+GL_LIGHTING_BIT+GL_COLOR_BUFFER_BIT+GL_TEXTURE_BIT+GL_CURRENT_BIT+GL_STENCIL_BUFFER_BIT);
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GLfloat shadowColor[4];
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if(shadow)
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{
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*(tVector3*)shadowColor=gEnvironment->shadowColor;
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shadowColor[3]=gEnvironment->shadowIntensity;
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shadowColor[3]/=stencil;
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}
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else
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{
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*(tVector3*)shadowColor=gEnvironment->spotLightColor*(1/(stencil*1.5));
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shadowColor[3]=1;
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}
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glColor4fv(shadowColor);
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glDisable(GL_LIGHTING);
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glDisable(GL_TEXTURE_2D);
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glDisable(GL_DEPTH_TEST);
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glEnable(GL_BLEND);
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glEnable(GL_STENCIL_TEST);
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glStencilFunc(GL_NOTEQUAL, 1, 0xffffffff);
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glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
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if(shadow)
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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else
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glBlendFunc(GL_DST_COLOR, GL_ONE);
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glLoadIdentity();
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glBegin(GL_TRIANGLE_STRIP);
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glVertex3f(-2.0f, 1.0f,-1.00f);
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glVertex3f(-2.0f,-1.0f,-1.00f);
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glVertex3f( 2.0f, 1.0f,-1.00f);
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glVertex3f( 2.0f,-1.0f,-1.00f);
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glEnd();
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glPopAttrib();
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}
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