Differential D4455 Diff 14275 source/blender/draw/modes/shaders/common_hair_lib.glsl

Changeset View

Standalone View

source/blender/draw/modes/shaders/common_hair_lib.glsl

/**		/**
* Library to create hairs dynamically from control points.		* Library to create hairs dynamically from control points.
* This is less bandwidth intensive than fetching the vertex attributes		* This is less bandwidth intensive than fetching the vertex attributes
* but does more ALU work per vertex. This also reduce the number		* but does more ALU work per vertex. This also reduce the number
* of data the CPU has to precompute and transfert for each update.		* of data the CPU has to precompute and transfert for each update.
**/		*/

/**		/**
* hairStrandsRes: Number of points per hair strand.		* hairStrandsRes: Number of points per hair strand.
* 2 - no subdivision		* 2 - no subdivision
* 3+ - 1 or more interpolated points per hair.		* 3+ - 1 or more interpolated points per hair.
**/		*/
uniform int hairStrandsRes = 8;		uniform int hairStrandsRes = 8;

/**		/**
* hairThicknessRes : Subdiv around the hair.		* hairThicknessRes : Subdiv around the hair.
* 1 - Wire Hair: Only one pixel thick, independent of view distance.		* 1 - Wire Hair: Only one pixel thick, independent of view distance.
* 2 - Polystrip Hair: Correct width, flat if camera is parallel.		* 2 - Polystrip Hair: Correct width, flat if camera is parallel.
* 3+ - Cylinder Hair: Massive calculation but potentially perfect. Still need proper support.		* 3+ - Cylinder Hair: Massive calculation but potentially perfect. Still need proper support.
**/		*/
uniform int hairThicknessRes = 1;		uniform int hairThicknessRes = 1;

/* Hair thickness shape. */		/* Hair thickness shape. */
uniform float hairRadRoot = 0.01;		uniform float hairRadRoot = 0.01;
uniform float hairRadTip = 0.0;		uniform float hairRadTip = 0.0;
uniform float hairRadShape = 0.5;		uniform float hairRadShape = 0.5;
uniform bool hairCloseTip = true;		uniform bool hairCloseTip = true;

Show All 24 Lines

/* -- Subdivision stage -- */		/* -- Subdivision stage -- */
/**		/**
* We use a transform feedback to preprocess the strands and add more subdivision to it.		* We use a transform feedback to preprocess the strands and add more subdivision to it.
* For the moment theses are simple smooth interpolation but one could hope to see the full		* For the moment theses are simple smooth interpolation but one could hope to see the full
* children particle modifiers being evaluated at this stage.		* children particle modifiers being evaluated at this stage.
*		*
* If no more subdivision is needed, we can skip this step.		* If no more subdivision is needed, we can skip this step.
**/		*/

#ifdef HAIR_PHASE_SUBDIV		#ifdef HAIR_PHASE_SUBDIV
int hair_get_base_id(float local_time, int strand_segments, out float interp_time)		int hair_get_base_id(float local_time, int strand_segments, out float interp_time)
{		{
float time_per_strand_seg = 1.0 / float(strand_segments);		float time_per_strand_seg = 1.0 / float(strand_segments);

float ratio = local_time / time_per_strand_seg;		float ratio = local_time / time_per_strand_seg;
interp_time = fract(ratio);		interp_time = fract(ratio);
Show All 29 Lines	if (id + 1 >= strand_segments) {
data3 = data2 * 2.0 - data1;		data3 = data2 * 2.0 - data1;
}		}
}		}
#endif		#endif

/* -- Drawing stage -- */		/* -- Drawing stage -- */
/**		/**
* For final drawing, the vertex index and the number of vertex per segment		* For final drawing, the vertex index and the number of vertex per segment
**/		*/

#ifndef HAIR_PHASE_SUBDIV		#ifndef HAIR_PHASE_SUBDIV
int hair_get_strand_id(void)		int hair_get_strand_id(void)
{		{
return gl_VertexID / (hairStrandsRes * hairThicknessRes);		return gl_VertexID / (hairStrandsRes * hairThicknessRes);
}		}

int hair_get_base_id(void)		int hair_get_base_id(void)
▲ Show 20 Lines • Show All 95 Lines • Show Last 20 Lines