コード例 #1
0
ファイル: SceneRenderFuncs.cpp プロジェクト: jazzboysc/RTGI
void Scene::CreateShadowMap( FrameBuffer *shadMapBuf, float *shadMapMatrixTranspose, int lightNum, float shadowMapBias )
{
	// Go ahead and render the shadow map
	glPushAttrib( GL_COLOR_BUFFER_BIT );
	glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );
	shadMapBuf->BindBuffer();
	shadMapBuf->ClearBuffers();
	glMatrixMode( GL_PROJECTION );
	glPushMatrix();
	glLoadIdentity();
	LightPerspectiveMatrix( lightNum, shadMapBuf->GetAspectRatio() );
	glMatrixMode( GL_MODELVIEW );
	glPushMatrix();
	glLoadIdentity();
		LightLookAtMatrix( lightNum );
		//this->Draw( MATL_FLAGS_NONE, OBJECT_OPTION_NONE, true );
		this->Draw( MATL_FLAGS_NONE, OBJECT_OPTION_USE_LOWRES, true );
	glPopMatrix();
	glMatrixMode( GL_PROJECTION );
	glPopMatrix();
	glMatrixMode( GL_MODELVIEW );
	shadMapBuf->UnbindBuffer();
	glPopAttrib();

	// Now compute the shadow map matrix for use by the current eye/camera view
	glPushMatrix();
	glLoadIdentity();
	glTranslatef( 0.5f, 0.5f, 0.5f + shadowMapBias );
	glScalef( 0.5f, 0.5f, 0.5f );
	LightPerspectiveMatrix( lightNum, shadMapBuf->GetAspectRatio() );
	LightLookAtMatrix( lightNum );
	camera->InverseLookAtMatrix();
	glGetFloatv(GL_TRANSPOSE_MODELVIEW_MATRIX, shadMapMatrixTranspose);
	glGetFloatv(GL_TRANSPOSE_MODELVIEW_MATRIX, shadMapTransMatrix[lightNum]);  // The scene's internal storage
	glGetFloatv(GL_MODELVIEW_MATRIX, shadMapMatrix[lightNum]);                 // The scene's internal storage
	glPopMatrix(); 

	shadowMapTexID[lightNum] = shadMapBuf->GetDepthTextureID();
}
コード例 #2
0
// This creates a shadow map.  The rendering pass is already done for you, but you need to
//    fill in the matrix creation code (though all the subparts are available in the framework)
void Scene::CreateShadowMap( FrameBuffer *shadMapBuf, float *shadMapMatrixTranspose, int lightNum, float shadowMapBias )
{
	// Go ahead and render the shadow map
	glPushAttrib( GL_COLOR_BUFFER_BIT );
	glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );
	shadMapBuf->BindBuffer();
	shadMapBuf->ClearBuffers();

	// Set up the projection matrix for the shadow map
	glMatrixMode( GL_PROJECTION );
	glPushMatrix();
	glLoadIdentity();
	LightPerspectiveMatrix( lightNum, shadMapBuf->GetAspectRatio() );

	// Set up the modelview ( i.e., light gluLookAt() )
	glMatrixMode( GL_MODELVIEW );
	glPushMatrix();
	glLoadIdentity();
		LightLookAtMatrix( lightNum );
		this->Draw( MATL_FLAGS_NONE, OBJECT_OPTION_NONE, true );
	glPopMatrix();

	// Go ahead and pop off the new projection and modelview matrices
	glMatrixMode( GL_PROJECTION );
	glPopMatrix();
	glMatrixMode( GL_MODELVIEW );
	shadMapBuf->UnbindBuffer();
	glPopAttrib();

	// Now compute the shadow map matrix for use by the current eye/camera view
	glPushMatrix();
	glLoadIdentity();

	// Put here the commands to create the shadow map matrix.  Note:  The 
	//    Scene and Camera classes give you access to functions that multiply
	//    bits of the shadow map matrix onto the current matrix stack.  You
	//    simply need to discover what they are and apply them in the right 
	//    order here.  The scale and bias matrix needs to be done yourself, 
	//    however (and you should try to use the shadowMapBias) parameter.
	
	glGetFloatv(GL_TRANSPOSE_MODELVIEW_MATRIX, shadMapMatrixTranspose);  // Copy the transpose matrix
	glGetFloatv(GL_TRANSPOSE_MODELVIEW_MATRIX, shadMapTransMatrix);      // Also copy to the scene's internal storage
	glPopMatrix(); 

	// Make sure the Scene class knows where the shadow map is stored.
	shadowMapTexID = shadMapBuf->GetDepthTextureID();
}