diff options
Diffstat (limited to 'indra/newview/app_settings/shaders/class3/deferred/depthToShadowVolumeG.glsl')
| -rw-r--r-- | indra/newview/app_settings/shaders/class3/deferred/depthToShadowVolumeG.glsl | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/indra/newview/app_settings/shaders/class3/deferred/depthToShadowVolumeG.glsl b/indra/newview/app_settings/shaders/class3/deferred/depthToShadowVolumeG.glsl new file mode 100644 index 0000000000..cdaff4b09f --- /dev/null +++ b/indra/newview/app_settings/shaders/class3/deferred/depthToShadowVolumeG.glsl @@ -0,0 +1,202 @@ +/** + * @file depthToShadowVolumeG.glsl + * + * $LicenseInfo:firstyear=2011&license=viewerlgpl$ + * Second Life Viewer Source Code + * Copyright (C) 2011, Linden Research, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; + * version 2.1 of the License only. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA + * $/LicenseInfo$ + */ +#extension GL_ARB_geometry_shader4 : enable +#extension GL_ARB_texture_rectangle : enable + +/*[EXTRA_CODE_HERE]*/ + +layout (triangles) in; +layout (triangle_strip, max_vertices = 128) out; + +uniform sampler2DRect depthMap; +uniform mat4 shadowMatrix[6]; +uniform vec4 lightpos; + +VARYING vec2 vary_texcoord0; + +out vec3 to_vec; + +void cross_products(out vec4 ns[3], int a, int b, int c) +{ + ns[0] = cross(gl_PositionIn[b].xyz - gl_PositionIn[a].xyz, gl_PositionIn[c].xyz - gl_PositionIn[a].xyz); + ns[1] = cross(gl_PositionIn[c].xyz - gl_PositionIn[b].xyz, gl_PositionIn[a].xyz - gl_PositionIn[b].xyz); + ns[2] = cross(gl_PositionIn[a].xyz - gl_PositionIn[c].xyz, gl_PositionIn[b].xyz - gl_PositionIn[c].xyz); +} + +vec3 getLightDirection(vec4 lightpos, vec3 pos) +{ + + vec3 lightdir = lightpos.xyz - lightpos.w * pos; + return lightdir; +} + +void emitTri(vec4 v[3]) +{ + gl_Position = proj_matrix * v[0]; + EmitVertex(); + + gl_Position = proj_matrix * v[1]; + EmitVertex(); + + gl_Position = proj_matrix * v[2]; + EmitVertex(); + + EndPrimitive(); +} + +void emitQuad(vec4 v[4] +{ + // Emit a quad as a triangle strip. + gl_Position = proj_matrix*v[0]; + EmitVertex(); + + gl_Position = proj_matrix*v[1]; + EmitVertex(); + + gl_Position = proj_matrix*v[2]; + EmitVertex(); + + gl_Position = proj_matrix*v[3]; + EmitVertex(); + + EndPrimitive(); +} + +void emitPrimitives(int layer) +{ + int i = layer; + gl_Layer = i; + + vec4 depth1 = vec4(texture2DRect(depthMap, tc0).rg, texture2DRect(depthMap, tc1).rg)); + vec3 depth2 = vec4(texture2DRect(depthMap, tc2).rg, texture2DRect(depthMap, tc3).rg)); + vec3 depth3 = vec4(texture2DRect(depthMap, tc4).rg, texture2DRect(depthMap, tc5).rg)); + vec3 depth4 = vec4(texture2DRect(depthMap, tc6).rg, texture2DRect(depthMap, tc7).rg)); + + depth1 = min(depth1, depth2); + depth1 = min(depth1, depth3); + depth1 = min(depth1, depth4); + + vec2 depth = min(depth1.xy, depth1.zw); + + int side = sqrt(gl_VerticesIn); + + for (int j = 0; j < side; j++) + { + for (int k = 0; k < side; ++k) + { + vec3 pos = gl_PositionIn[(j * side) + k].xyz; + vec4 v = shadowMatrix[i] * vec4(pos, 1.0); + gl_Position = v; + to_vec = pos - light_position.xyz * depth; + EmitVertex(); + } + + EndPrimitive(); + } + + vec3 norms[3]; // Normals + vec3 lightdir3]; // Directions toward light + + vec4 v[4]; // Temporary vertices + + vec4 or_pos[3] = + { // Triangle oriented toward light source + gl_PositionIn[0], + gl_PositionIn[2], + gl_PositionIn[4] + }; + + // Compute normal at each vertex. + cross_products(n, 0, 2, 4); + + // Compute direction from vertices to light. + lightdir[0] = getLightDirection(lightpos, gl_PositionIn[0].xyz); + lightdir[1] = getLightDirection(lightpos, gl_PositionIn[2].xyz); + lightdir[2] = getLightDirection(lightpos, gl_PositionIn[4].xyz); + + // Check if the main triangle faces the light. + bool faces_light = true; + if (!(dot(ns[0],d[0]) > 0 + |dot(ns[1],d[1]) > 0 + |dot(ns[2],d[2]) > 0)) + { + // Flip vertex winding order in or_pos. + or_pos[1] = gl_PositionIn[4]; + or_pos[2] = gl_PositionIn[2]; + faces_light = false; + } + + // Near cap: simply render triangle. + emitTri(or_pos); + + // Far cap: extrude positions to infinity. + v[0] =vec4(lightpos.w * or_pos[0].xyz - lightpos.xyz,0); + v[1] =vec4(lightpos.w * or_pos[2].xyz - lightpos.xyz,0); + v[2] =vec4(lightpos.w * or_pos[1].xyz - lightpos.xyz,0); + + emitTri(v); + + // Loop over all edges and extrude if needed. + for ( int i=0; i<3; i++ ) + { + // Compute indices of neighbor triangle. + int v0 = i*2; + int nb = (i*2+1); + int v1 = (i*2+2) % 6; + cross_products(n, v0, nb, v1); + + // Compute direction to light, again as above. + d[0] =lightpos.xyz-lightpos.w*gl_PositionIn[v0].xyz; + d[1] =lightpos.xyz-lightpos.w*gl_PositionIn[nb].xyz; + d[2] =lightpos.xyz-lightpos.w*gl_PositionIn[v1].xyz; + + bool is_parallel = gl_PositionIn[nb].w < 1e-5; + + // Extrude the edge if it does not have a + // neighbor, or if it's a possible silhouette. + if (is_parallel || + ( faces_light != (dot(ns[0],d[0])>0 || + dot(ns[1],d[1])>0 || + dot(ns[2],d[2])>0) )) + { + // Make sure sides are oriented correctly. + int i0 = faces_light ? v0 : v1; + int i1 = faces_light ? v1 : v0; + + v[0] = gl_PositionIn[i0]; + v[1] = vec4(lightpos.w*gl_PositionIn[i0].xyz - lightpos.xyz, 0); + v[2] = gl_PositionIn[i1]; + v[3] = vec4(lightpos.w*gl_PositionIn[i1].xyz - lightpos.xyz, 0); + + emitQuad(v); + } + } +} + +void main() +{ + // Output + emitPrimitives(0); +} |