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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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.
*
* The Original Code is Copyright (C) 2014 Blender Foundation.
* All rights reserved.
*
* Contributor(s): Sergey Sharybin
*
* ***** END GPL LICENSE BLOCK *****
*/
struct VertexData {
vec4 position;
vec3 normal;
vec2 uv;
};
layout(lines_adjacency) in;
#ifdef WIREFRAME
layout(line_strip, max_vertices = 8) out;
#else
layout(triangle_strip, max_vertices = 4) out;
#endif
uniform mat4 modelViewMatrix;
uniform mat4 projectionMatrix;
uniform int PrimitiveIdBase;
uniform int osd_fvar_count;
uniform int osd_active_uv_offset;
in block {
VertexData v;
} inpt[];
#define INTERP_FACE_VARYING_2(result, fvarOffset, tessCoord) \
{ \
vec2 v[4]; \
int primOffset = (gl_PrimitiveID + PrimitiveIdBase) * 4; \
for (int i = 0; i < 4; ++i) { \
int index = (primOffset + i) * osd_fvar_count + fvarOffset; \
v[i] = vec2(texelFetch(FVarDataBuffer, index).s, \
texelFetch(FVarDataBuffer, index + 1).s); \
} \
result = mix(mix(v[0], v[1], tessCoord.s), \
mix(v[3], v[2], tessCoord.s), \
tessCoord.t); \
}
uniform samplerBuffer FVarDataBuffer;
uniform isamplerBuffer FVarDataOffsetBuffer;
out block {
VertexData v;
} outpt;
#ifdef FLAT_SHADING
void emit(int index, vec3 normal)
{
outpt.v.position = inpt[index].v.position;
outpt.v.normal = normal;
/* TODO(sergey): Only uniform subdivisions atm. */
vec2 quadst[4] = vec2[](vec2(0, 0), vec2(1, 0), vec2(1, 1), vec2(0, 1));
vec2 st = quadst[index];
INTERP_FACE_VARYING_2(outpt.v.uv, osd_active_uv_offset, st);
gl_Position = projectionMatrix * inpt[index].v.position;
EmitVertex();
}
# ifdef WIREFRAME
void emit_edge(int v0, int v1, vec3 normal)
{
emit(v0, normal);
emit(v1, normal);
}
# endif
#else
void emit(int index)
{
outpt.v.position = inpt[index].v.position;
outpt.v.normal = inpt[index].v.normal;
/* TODO(sergey): Only uniform subdivisions atm. */
vec2 quadst[4] = vec2[](vec2(0, 0), vec2(1, 0), vec2(1, 1), vec2(0, 1));
vec2 st = quadst[index];
INTERP_FACE_VARYING_2(outpt.v.uv, osd_active_uv_offset, st);
gl_Position = projectionMatrix * inpt[index].v.position;
EmitVertex();
}
# ifdef WIREFRAME
void emit_edge(int v0, int v1)
{
emit(v0);
emit(v1);
}
# endif
#endif
void main()
{
gl_PrimitiveID = gl_PrimitiveIDIn;
#ifdef FLAT_SHADING
vec3 A = (inpt[0].v.position - inpt[1].v.position).xyz;
vec3 B = (inpt[3].v.position - inpt[1].v.position).xyz;
vec3 flat_normal = normalize(cross(B, A));
# ifndef WIREFRAME
emit(0, flat_normal);
emit(1, flat_normal);
emit(3, flat_normal);
emit(2, flat_normal);
# else
emit_edge(0, 1, flat_normal);
emit_edge(1, 2, flat_normal);
emit_edge(2, 3, flat_normal);
emit_edge(3, 0, flat_normal);
# endif
#else
# ifndef WIREFRAME
emit(0);
emit(1);
emit(3);
emit(2);
# else
emit_edge(0, 1);
emit_edge(1, 2);
emit_edge(2, 3);
emit_edge(3, 0);
# endif
#endif
EndPrimitive();
}
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