mirror of
https://github.com/NVIDIA/cuda-samples.git
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305 lines
14 KiB
C++
305 lines
14 KiB
C++
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// GLSL shaders for particle rendering
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#define STRINGIFY(A) #A
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// particle vertex shader
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const char *particleVS = STRINGIFY(
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uniform float pointRadius; // point size in world space \n
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uniform float pointScale; // scale to calculate size in pixels \n
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uniform vec4 eyePos; \n
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void main() \n
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{
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\n
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vec4 wpos = vec4(gl_Vertex.xyz, 1.0); \n
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gl_Position = gl_ModelViewProjectionMatrix *wpos; \n
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// calculate window-space point size \n
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vec4 eyeSpacePos = gl_ModelViewMatrix *wpos; \n
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float dist = length(eyeSpacePos.xyz); \n
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gl_PointSize = pointRadius * (pointScale / dist); \n
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gl_TexCoord[0] = gl_MultiTexCoord0; // sprite texcoord \n
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gl_TexCoord[1] = eyeSpacePos; \n
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gl_FrontColor = gl_Color; \n
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} \n
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);
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// motion blur shaders
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const char *mblurVS = STRINGIFY(
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uniform float timestep; \n
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void main() \n
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{
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\n
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vec3 pos = gl_Vertex.xyz; \n
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vec3 vel = gl_MultiTexCoord0.xyz; \n
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vec3 pos2 = (pos - vel*timestep).xyz; // previous position \n
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gl_Position = gl_ModelViewMatrix * vec4(pos, 1.0); \n // eye space
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gl_TexCoord[0] = gl_ModelViewMatrix * vec4(pos2, 1.0); \n
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// aging \n
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float lifetime = gl_MultiTexCoord0.w; \n
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float age = gl_Vertex.w; \n
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float phase = (lifetime > 0.0) ? (age / lifetime) : 1.0; \n // [0, 1]
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gl_TexCoord[1].x = phase; \n
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float fade = 1.0 - phase; \n
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// float fade = 1.0; \n
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// gl_FrontColor = gl_Color; \n
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gl_FrontColor = vec4(gl_Color.xyz, gl_Color.w*fade); \n
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} \n
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);
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// motion blur geometry shader
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// - outputs stretched quad between previous and current positions
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const char *mblurGS =
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"#version 120\n"
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"#extension GL_EXT_geometry_shader4 : enable\n"
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STRINGIFY(
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uniform float pointRadius; // point size in world space \n
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void main() \n
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{
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\n
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// aging \n
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float phase = gl_TexCoordIn[0][1].x; \n
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float radius = pointRadius; \n
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// eye space \n
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vec3 pos = gl_PositionIn[0].xyz; \n
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vec3 pos2 = gl_TexCoordIn[0][0].xyz; \n
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vec3 motion = pos - pos2; \n
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vec3 dir = normalize(motion); \n
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float len = length(motion); \n
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vec3 x = dir *radius; \n
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vec3 view = normalize(-pos); \n
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vec3 y = normalize(cross(dir, view)) * radius; \n
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float facing = dot(view, dir); \n
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// check for very small motion to avoid jitter \n
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float threshold = 0.01; \n
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if ((len < threshold) || (facing > 0.95) || (facing < -0.95))
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{
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\n
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pos2 = pos;
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\n
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x = vec3(radius, 0.0, 0.0);
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\n
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y = vec3(0.0, -radius, 0.0);
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\n
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} \n
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// output quad \n
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gl_FrontColor = gl_FrontColorIn[0]; \n
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gl_TexCoord[0] = vec4(0, 0, 0, phase); \n
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gl_TexCoord[1] = gl_PositionIn[0]; \n
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gl_Position = gl_ProjectionMatrix * vec4(pos + x + y, 1); \n
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EmitVertex(); \n
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gl_TexCoord[0] = vec4(0, 1, 0, phase); \n
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gl_TexCoord[1] = gl_PositionIn[0]; \n
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gl_Position = gl_ProjectionMatrix * vec4(pos + x - y, 1); \n
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EmitVertex(); \n
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gl_TexCoord[0] = vec4(1, 0, 0, phase); \n
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gl_TexCoord[1] = gl_PositionIn[0]; \n
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gl_Position = gl_ProjectionMatrix * vec4(pos2 - x + y, 1); \n
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EmitVertex(); \n
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gl_TexCoord[0] = vec4(1, 1, 0, phase); \n
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gl_TexCoord[1] = gl_PositionIn[0]; \n
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gl_Position = gl_ProjectionMatrix * vec4(pos2 - x - y, 1); \n
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EmitVertex(); \n
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} \n
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);
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const char *simplePS = STRINGIFY(
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void main() \n
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{
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\n
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gl_FragColor = gl_Color; \n
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} \n
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);
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// render particle without shadows
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const char *particlePS = STRINGIFY(
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uniform float pointRadius; \n
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void main() \n
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{
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\n
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// calculate eye-space sphere normal from texture coordinates \n
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vec3 N; \n
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N.xy = gl_TexCoord[0].xy*vec2(2.0, -2.0) + vec2(-1.0, 1.0); \n
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float r2 = dot(N.xy, N.xy); \n
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if (r2 > 1.0) discard; // kill pixels outside circle \n
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N.z = sqrt(1.0-r2); \n
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// float alpha = saturate(1.0 - r2); \n
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float alpha = clamp((1.0 - r2), 0.0, 1.0); \n
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alpha *= gl_Color.w; \n
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gl_FragColor = vec4(gl_Color.xyz * alpha, alpha); \n
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} \n
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);
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// render particle including shadows
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const char *particleShadowPS = STRINGIFY(
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uniform float pointRadius; \n
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uniform sampler2D shadowTex; \n
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uniform sampler2D depthTex; \n
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void main() \n
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{
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\n
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// calculate eye-space sphere normal from texture coordinates \n
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vec3 N; \n
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N.xy = gl_TexCoord[0].xy*vec2(2.0, -2.0) + vec2(-1.0, 1.0); \n
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float r2 = dot(N.xy, N.xy); \n
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if (r2 > 1.0) discard; \n // kill pixels outside circle
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N.z = sqrt(1.0-r2); \n
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vec4 eyeSpacePos = gl_TexCoord[1]; \n
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vec4 eyeSpaceSpherePos = vec4(eyeSpacePos.xyz + N*pointRadius, 1.0); \n // point on sphere
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vec4 shadowPos = gl_TextureMatrix[0] * eyeSpaceSpherePos; \n
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vec3 shadow = vec3(1.0) - texture2DProj(shadowTex, shadowPos.xyw).xyz; \n
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// float alpha = saturate(1.0 - r2); \n
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float alpha = clamp((1.0 - r2), 0.0, 1.0); \n
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alpha *= gl_Color.w; \n
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gl_FragColor = vec4(gl_Color.xyz *shadow * alpha, alpha); \n // premul alpha
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}
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);
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// render particle as lit sphere
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const char *particleSpherePS = STRINGIFY(
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uniform float pointRadius; \n
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uniform vec3 lightDir = vec3(0.577, 0.577, 0.577); \n
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void main() \n
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{
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\n
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// calculate eye-space sphere normal from texture coordinates \n
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vec3 N; \n
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N.xy = gl_TexCoord[0].xy*vec2(2.0, -2.0) + vec2(-1.0, 1.0); \n
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float r2 = dot(N.xy, N.xy); \n
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if (r2 > 1.0) discard; // kill pixels outside circle \n
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N.z = sqrt(1.0-r2); \n
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// calculate depth \n
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vec4 eyeSpacePos = vec4(gl_TexCoord[1].xyz + N*pointRadius, 1.0); // position of this pixel on sphere in eye space \n
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vec4 clipSpacePos = gl_ProjectionMatrix *eyeSpacePos; \n
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gl_FragDepth = (clipSpacePos.z / clipSpacePos.w)*0.5+0.5; \n
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float diffuse = max(0.0, dot(N, lightDir)); \n
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gl_FragColor = diffuse *gl_Color; \n
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} \n
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);
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const char *passThruVS = STRINGIFY(
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void main() \n
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{
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\n
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gl_Position = gl_Vertex; \n
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gl_TexCoord[0] = gl_MultiTexCoord0; \n
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gl_FrontColor = gl_Color; \n
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} \n
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);
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const char *texture2DPS = STRINGIFY(
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uniform sampler2D tex; \n
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void main() \n
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{
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\n
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gl_FragColor = texture2D(tex, gl_TexCoord[0].xy); \n
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} \n
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);
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// 4 tap 3x3 gaussian blur
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const char *blurPS = STRINGIFY(
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uniform sampler2D tex; \n
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uniform vec2 texelSize; \n
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uniform float blurRadius; \n
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void main() \n
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{
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\n
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vec4 c; \n
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c = texture2D(tex, gl_TexCoord[0].xy + vec2(-0.5, -0.5)*texelSize*blurRadius); \n
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c += texture2D(tex, gl_TexCoord[0].xy + vec2(0.5, -0.5)*texelSize*blurRadius); \n
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c += texture2D(tex, gl_TexCoord[0].xy + vec2(0.5, 0.5)*texelSize*blurRadius); \n
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c += texture2D(tex, gl_TexCoord[0].xy + vec2(-0.5, 0.5)*texelSize*blurRadius); \n
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c *= 0.25; \n
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gl_FragColor = c; \n
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} \n
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);
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// floor shader
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const char *floorVS = STRINGIFY(
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varying vec4 vertexPosEye; // vertex position in eye space \n
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varying vec3 normalEye; \n
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void main() \n
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{
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\n
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gl_Position = gl_ModelViewProjectionMatrix *gl_Vertex; \n
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gl_TexCoord[0] = gl_MultiTexCoord0; \n
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vertexPosEye = gl_ModelViewMatrix *gl_Vertex; \n
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normalEye = gl_NormalMatrix *gl_Normal; \n
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gl_FrontColor = gl_Color; \n
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} \n
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);
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const char *floorPS = STRINGIFY(
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uniform vec3 lightPosEye; // light position in eye space \n
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uniform vec3 lightColor; \n
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uniform sampler2D tex; \n
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uniform sampler2D shadowTex; \n
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varying vec4 vertexPosEye; // vertex position in eye space \n
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varying vec3 normalEye; \n
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void main() \n
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{
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\n
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vec4 shadowPos = gl_TextureMatrix[0] * vertexPosEye; \n
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vec4 colorMap = texture2D(tex, gl_TexCoord[0].xy); \n
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vec3 N = normalize(normalEye); \n
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vec3 L = normalize(lightPosEye - vertexPosEye.xyz); \n
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float diffuse = max(0.0, dot(N, L)); \n
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vec3 shadow = vec3(1.0) - texture2DProj(shadowTex, shadowPos.xyw).xyz; \n
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if (shadowPos.w < 0.0) shadow = lightColor; \n // avoid back projections
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gl_FragColor = vec4(gl_Color.xyz *colorMap.xyz *diffuse * shadow, 1.0); \n
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} \n
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);
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