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GPUParticle: Implements generic fade out and rework particles lifetime.

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git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@14852 178a84e3-b1eb-0310-8ba1-8eac791a3b58
This commit is contained in:
vincentlj
2013-12-31 17:25:10 +00:00
parent 9417541adf
commit 9fbd2b19b1
5 changed files with 109 additions and 58 deletions
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26
data/shaders/particle.frag
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@@ -1,21 +1,23 @@
#version 130
uniform sampler2D texture;
uniform sampler2D normals_and_depth;
uniform mat4 invproj;
uniform sampler2D normals_and_depth;
uniform mat4 invproj;
uniform vec2 screen;
in float lf;
out vec4 color;
void main(void)
{
vec2 xy = gl_FragCoord.xy / screen;
float FragZ = gl_FragCoord.z;
float EnvZ = texture2D(normals_and_depth, xy).a;
vec4 FragmentPos = invproj * (2. * vec4(xy, FragZ, 1.0) - 1.);
FragmentPos /= FragmentPos.w;
vec4 EnvPos = invproj * (2. * vec4(xy, EnvZ, 1.0) - 1.);
EnvPos /= EnvPos.w;
float len = dot(vec3(1.0), abs(texture2D(normals_and_depth, xy).xyz));
float alpha = (len < 0.2) ? 1. : clamp((EnvPos.z - FragmentPos.z) * 0.3, 0., 1.);
vec2 xy = gl_FragCoord.xy / screen;
float FragZ = gl_FragCoord.z;
float EnvZ = texture2D(normals_and_depth, xy).a;
vec4 FragmentPos = invproj * (2. * vec4(xy, FragZ, 1.0) - 1.);
FragmentPos /= FragmentPos.w;
vec4 EnvPos = invproj * (2. * vec4(xy, EnvZ, 1.0) - 1.);
EnvPos /= EnvPos.w;
float len = dot(vec3(1.0), abs(texture2D(normals_and_depth, xy).xyz));
float alpha = (len < 0.2) ? 1. : clamp((EnvPos.z - FragmentPos.z) * 0.3, 0., 1.);
color = texture2D(texture, gl_PointCoord.xy);
color.a *= alpha;
color.a *= alpha * (1. - lf);
}

5
data/shaders/particle.vert
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@@ -1,9 +1,14 @@
#version 130
uniform mat4 matrix;
in vec3 position;
in float lifetime;
out float lf;
void main(void)
{
lf = lifetime;
gl_Position = matrix * vec4(position, 1.0);
gl_PointSize = 300. / gl_Position.w;
}

12
data/shaders/pointemitter.vert
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@@ -3,6 +3,10 @@ uniform int dt;
uniform mat4 sourcematrix;
uniform int duration;
in vec3 particle_position_initial;
in float lifetime_initial;
in vec4 particle_velocity_initial;
in vec3 particle_position;
in float lifetime;
in vec4 particle_velocity;
@@ -13,9 +17,9 @@ out vec4 new_particle_velocity;
void main(void)
{
vec4 initialposition = sourcematrix * vec4(0., 0., 0., 1.0);
new_particle_position = (lifetime > 0.) ? particle_position + particle_velocity.xyz * float(dt) : initialposition.xyz - particle_velocity.xyz * lifetime;
new_lifetime = (lifetime > 0.) ? lifetime - float(dt) : float(duration) - lifetime;
new_particle_velocity = particle_velocity;
vec4 initialposition = sourcematrix * vec4(particle_position_initial, 1.0);
new_particle_position = (lifetime < 1.) ? particle_position + particle_velocity.xyz * float(dt) : initialposition.xyz;
new_lifetime = (lifetime < 1.) ? lifetime + (float(dt)/lifetime_initial) : 0.;
new_particle_velocity = (lifetime < 1.) ? particle_velocity : particle_velocity_initial;
gl_Position = vec4(0.);
}

110
src/graphics/gpuparticles.cpp
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@@ -252,27 +252,44 @@ void ParticleSystemProxy::setEmitter(scene::IParticleEmitter* emitter)
normal_and_depth = getTextureGLuint(irr_driver->getRTT(RTT_NORMAL_AND_DEPTH));
SimulationProgram = LoadTFBProgram(file_manager->getAsset("shaders/pointemitter.vert").c_str(), varyings, 3);
loc_duration = glGetUniformLocation(SimulationProgram, "duration");
loc_dt = glGetUniformLocation(SimulationProgram, "dt");
loc_sourcematrix = glGetUniformLocation(SimulationProgram, "sourcematrix");
loc_position = glGetAttribLocation(SimulationProgram, "particle_position");
loc_lifetime = glGetAttribLocation(SimulationProgram, "lifetime");
loc_velocity = glGetAttribLocation(SimulationProgram, "particle_velocity");
printf("count:%d\nduration:%d\n", count, duration);
uniform_duration = glGetUniformLocation(SimulationProgram, "duration");
uniform_dt = glGetUniformLocation(SimulationProgram, "dt");
uniform_sourcematrix = glGetUniformLocation(SimulationProgram, "sourcematrix");
attrib_position = glGetAttribLocation(SimulationProgram, "particle_position");
attrib_lifetime = glGetAttribLocation(SimulationProgram, "lifetime");
attrib_velocity = glGetAttribLocation(SimulationProgram, "particle_velocity");
attrib_initial_position = glGetAttribLocation(SimulationProgram, "particle_position_initial");
attrib_initial_lifetime = glGetAttribLocation(SimulationProgram, "lifetime_initial");
attrib_initial_velocity = glGetAttribLocation(SimulationProgram, "particle_velocity_initial");
RenderProgram = LoadProgram(file_manager->getAsset("shaders/particle.vert").c_str(), file_manager->getAsset("shaders/particle.frag").c_str());
loc_matrix = glGetUniformLocation(RenderProgram, "matrix");
loc_texture = glGetUniformLocation(RenderProgram, "texture");
loc_invproj = glGetUniformLocation(RenderProgram, "invproj");
loc_screen = glGetUniformLocation(RenderProgram, "screen");
loc_normal_and_depths = glGetUniformLocation(RenderProgram, "normals_and_depth");
attrib_pos = glGetAttribLocation(RenderProgram, "position");
attrib_lf = glGetAttribLocation(RenderProgram, "lifetime");
uniform_matrix = glGetUniformLocation(RenderProgram, "matrix");
uniform_texture = glGetUniformLocation(RenderProgram, "texture");
uniform_invproj = glGetUniformLocation(RenderProgram, "invproj");
uniform_screen = glGetUniformLocation(RenderProgram, "screen");
uniform_normal_and_depths = glGetUniformLocation(RenderProgram, "normals_and_depth");
float *particles = new float[COMPONENTCOUNT * count];
float *particles = new float[COMPONENTCOUNT * count], *initialvalue = new float[COMPONENTCOUNT * count];
unsigned lifetime_range = emitter->getMaxLifeTime() - emitter->getMinLifeTime();
printf("count:%d\nduration_min:%d\nduration_max:%d\n", count, emitter->getMinLifeTime(), emitter->getMaxLifeTime());
for (unsigned i = 0; i < count; i++) {
particles[COMPONENTCOUNT * i] = 0.;
particles[COMPONENTCOUNT * i + 1] = 0.;
particles[COMPONENTCOUNT * i + 2] = 0.;
particles[COMPONENTCOUNT * i + 3] = rand() % duration;
particles[COMPONENTCOUNT * i] = getAbsolutePosition().X;
particles[COMPONENTCOUNT * i + 1] = getAbsolutePosition().Y;
particles[COMPONENTCOUNT * i + 2] = getAbsolutePosition().Z;
// Initial lifetime is 0 percent
particles[COMPONENTCOUNT * i + 3] = 0.;
initialvalue[COMPONENTCOUNT * i] = 0.;
initialvalue[COMPONENTCOUNT * i + 1] = 0.;
initialvalue[COMPONENTCOUNT * i + 2] = 0.;
initialvalue[COMPONENTCOUNT * i + 3] = rand() % lifetime_range;
initialvalue[COMPONENTCOUNT * i + 3] += emitter->getMinLifeTime();
core::vector3df particledir = emitter->getDirection();
particledir.rotateXYBy(os::Randomizer::frand() * emitter->getMaxAngleDegrees());
particledir.rotateYZBy(os::Randomizer::frand() * emitter->getMaxAngleDegrees());
@@ -281,8 +298,13 @@ void ParticleSystemProxy::setEmitter(scene::IParticleEmitter* emitter)
particles[COMPONENTCOUNT * i + 4] = particledir.X;
particles[COMPONENTCOUNT * i + 5] = particledir.Y;
particles[COMPONENTCOUNT * i + 6] = particledir.Z;
initialvalue[COMPONENTCOUNT * i + 4] = particledir.X;
initialvalue[COMPONENTCOUNT * i + 5] = particledir.Y;
initialvalue[COMPONENTCOUNT * i + 6] = particledir.Z;
}
glGenBuffers(2, tfb_buffers);
glBindBuffer(GL_ARRAY_BUFFER, initial_values_buffer);
glBufferData(GL_ARRAY_BUFFER, COMPONENTCOUNT * count * sizeof(float), initialvalue, GL_STREAM_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, tfb_buffers[0]);
glBufferData(GL_ARRAY_BUFFER, COMPONENTCOUNT * count * sizeof(float), particles, GL_STREAM_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, tfb_buffers[1]);
@@ -307,31 +329,40 @@ void ParticleSystemProxy::simulate()
core::matrix4 matrix = getAbsoluteTransformation();
glUseProgram(SimulationProgram);
glEnable(GL_RASTERIZER_DISCARD);
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glEnableVertexAttribArray(2);
glEnableVertexAttribArray(attrib_position);
glEnableVertexAttribArray(attrib_lifetime);
glEnableVertexAttribArray(attrib_velocity);
glBindBuffer(GL_ARRAY_BUFFER, tfb_buffers[0]);
glVertexAttribPointer(loc_position, 3, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), (GLvoid*)0);
glVertexAttribPointer(loc_lifetime, 1, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), (GLvoid*)(3 * sizeof(float)));
glVertexAttribPointer(loc_velocity, 4, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), (GLvoid*)(4 * sizeof(float)));
glVertexAttribPointer(attrib_position, 3, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), (GLvoid*)0);
glVertexAttribPointer(attrib_lifetime, 1, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), (GLvoid*)(3 * sizeof(float)));
glVertexAttribPointer(attrib_velocity, 4, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), (GLvoid*)(4 * sizeof(float)));
glEnableVertexAttribArray(attrib_initial_position);
glEnableVertexAttribArray(attrib_initial_lifetime);
glEnableVertexAttribArray(attrib_initial_velocity);
glBindBuffer(GL_ARRAY_BUFFER, initial_values_buffer);
glVertexAttribPointer(attrib_initial_position, 3, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), (GLvoid*)0);
glVertexAttribPointer(attrib_initial_lifetime, 1, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), (GLvoid*)(3 * sizeof(float)));
glVertexAttribPointer(attrib_initial_velocity, 4, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), (GLvoid*)(4 * sizeof(float)));
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, tfb_buffers[1]);
glUniform1i(loc_dt, timediff);
glUniform1i(loc_duration, duration);
glUniformMatrix4fv(loc_sourcematrix, 1, GL_FALSE, matrix.pointer());
glUniform1i(uniform_dt, 16);
glUniform1i(uniform_duration, duration);
glUniformMatrix4fv(uniform_sourcematrix, 1, GL_FALSE, matrix.pointer());
glBeginTransformFeedback(GL_POINTS);
glDrawArrays(GL_POINTS, 0, count);
glEndTransformFeedback();
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
glDisableVertexAttribArray(2);
glDisableVertexAttribArray(attrib_position);
glDisableVertexAttribArray(attrib_lifetime);
glDisableVertexAttribArray(attrib_velocity);
glDisableVertexAttribArray(attrib_initial_position);
glDisableVertexAttribArray(attrib_initial_lifetime);
glDisableVertexAttribArray(attrib_initial_velocity);
glDisable(GL_RASTERIZER_DISCARD);
std::swap(tfb_buffers[0], tfb_buffers[1]);
}
void ParticleSystemProxy::draw()
{
glDisable(GL_ALPHA_TEST);
glDepthMask(GL_FALSE);
glEnable(GL_BLEND);
core::matrix4 matrix = irr_driver->getVideoDriver()->getTransform(video::ETS_PROJECTION);
@@ -341,6 +372,8 @@ void ParticleSystemProxy::draw()
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
glUseProgram(RenderProgram);
glEnableVertexAttribArray(attrib_pos);
glEnableVertexAttribArray(attrib_lf);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, tfb_buffers[0]);
float screen[2] = {
@@ -350,20 +383,21 @@ void ParticleSystemProxy::draw()
irr::core::matrix4 invproj = irr_driver->getVideoDriver()->getTransform(irr::video::ETS_PROJECTION);
invproj.makeInverse();
bindUniformToTextureUnit(loc_texture, texture, 0);
bindUniformToTextureUnit(loc_normal_and_depths, normal_and_depth, 1);
bindUniformToTextureUnit(uniform_texture, texture, 0);
bindUniformToTextureUnit(uniform_normal_and_depths, normal_and_depth, 1);
glUniformMatrix4fv(loc_invproj, 1, GL_FALSE, invproj.pointer());
glUniform2f(loc_screen, screen[0], screen[1]);
glUniformMatrix4fv(loc_matrix, 1, GL_FALSE, matrix.pointer());
glUniformMatrix4fv(uniform_invproj, 1, GL_FALSE, invproj.pointer());
glUniform2f(uniform_screen, screen[0], screen[1]);
glUniformMatrix4fv(uniform_matrix, 1, GL_FALSE, matrix.pointer());
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), 0);
glVertexAttribPointer(attrib_pos, 3, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), 0);
glVertexAttribPointer(attrib_lf, 1, GL_FLOAT, GL_FALSE, COMPONENTCOUNT * sizeof(float), (GLvoid *) (3 * sizeof(float)));
glDrawArrays(GL_POINTS, 0, count);
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(attrib_pos);
glDisableVertexAttribArray(attrib_lf);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glActiveTexture(GL_TEXTURE0);
glDisable(GL_VERTEX_PROGRAM_POINT_SIZE);
glEnable(GL_ALPHA_TEST);
glDepthMask(GL_TRUE);
}

14
src/graphics/gpuparticles.h
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@@ -29,10 +29,16 @@ public:
class ParticleSystemProxy : public scene::CParticleSystemSceneNode {
protected:
GLuint SimulationProgram, RenderProgram;
GLuint loc_duration, loc_sourcematrix, loc_dt, loc_matrix, loc_texture, loc_normal_and_depths, loc_screen, loc_invproj;
GLuint loc_position, loc_velocity, loc_lifetime;
GLuint tfb_buffers[2];
GLuint tfb_buffers[2], initial_values_buffer;
GLuint SimulationProgram;
GLuint attrib_position, attrib_velocity, attrib_lifetime, attrib_initial_position, attrib_initial_velocity, attrib_initial_lifetime;
GLuint uniform_duration, uniform_sourcematrix, uniform_dt;
GLuint RenderProgram;
GLuint attrib_pos, attrib_lf;
GLuint uniform_matrix, uniform_texture, uniform_normal_and_depths, uniform_screen, uniform_invproj;
GLuint texture, normal_and_depth;
unsigned duration, count, LastEmitTime;