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Commit d19fae55 by Geoff Lang
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Port the ParticleSystem sample to the new sample framework.

BUG=angle:521 Change-Id: I6d00333ac7761f15ee83a47dc3e6e3cc13c675cd Reviewed-on: https://chromium-review.googlesource.com/188195Reviewed-by: 's avatarShannon Woods <shannonwoods@chromium.org> Reviewed-by: 's avatarJamie Madill <jmadill@chromium.org> Tested-by: 's avatarGeoff Lang <geofflang@chromium.org>
parent 6e05c272
Showing with 256 additions and 319 deletions
projects/build/all.sln
...@@ -86,7 +86,7 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "multi_texture", "..\samples ...@@ -86,7 +86,7 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "multi_texture", "..\samples
EndProject EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "particle_system", "..\samples\particle_system.vcxproj", "{8C20B90A-FBCB-B63F-435A-3299A1C38B2C}" Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "particle_system", "..\samples\particle_system.vcxproj", "{8C20B90A-FBCB-B63F-435A-3299A1C38B2C}"
ProjectSection(ProjectDependencies) = postProject ProjectSection(ProjectDependencies) = postProject
{80E5C3D9-93C2-943E-176F-C9A903E27BC9} = {80E5C3D9-93C2-943E-176F-C9A903E27BC9} {297C46B0-9263-A9EA-82B1-EA221E7D7C7F} = {297C46B0-9263-A9EA-82B1-EA221E7D7C7F}
{FBAEE4F6-562A-588F-01F9-72DCABB3B061} = {FBAEE4F6-562A-588F-01F9-72DCABB3B061} {FBAEE4F6-562A-588F-01F9-72DCABB3B061} = {FBAEE4F6-562A-588F-01F9-72DCABB3B061}
{7FBD6F69-B9A4-69F1-A12B-8DACB3F8CD81} = {7FBD6F69-B9A4-69F1-A12B-8DACB3F8CD81} {7FBD6F69-B9A4-69F1-A12B-8DACB3F8CD81} = {7FBD6F69-B9A4-69F1-A12B-8DACB3F8CD81}
EndProjectSection EndProjectSection
......
projects/samples/particle_system.vcxproj
...@@ -37,12 +37,12 @@ ...@@ -37,12 +37,12 @@
</PropertyGroup> </PropertyGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'"> <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<ClCompile> <ClCompile>
<AdditionalIncludeDirectories>..\..\samples\gles2_book\Common;..\..\include;C:\Program Files (x86)\Windows Kits\8.0\Include\shared;C:\Program Files (x86)\Windows Kits\8.0\Include\um;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories> <AdditionalIncludeDirectories>..\..\include;..\..\samples\angle\sample_util;C:\Program Files (x86)\Windows Kits\8.0\Include\shared;C:\Program Files (x86)\Windows Kits\8.0\Include\um;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalOptions>/MP %(AdditionalOptions)</AdditionalOptions> <AdditionalOptions>/MP %(AdditionalOptions)</AdditionalOptions>
<BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks> <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
<BufferSecurityCheck>true</BufferSecurityCheck> <BufferSecurityCheck>true</BufferSecurityCheck>
<DebugInformationFormat>ProgramDatabase</DebugInformationFormat> <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
<DisableSpecificWarnings>4100;4127;4189;4239;4244;4245;4512;4702;4530;4718;%(DisableSpecificWarnings)</DisableSpecificWarnings> <DisableSpecificWarnings>4201;4100;4127;4189;4239;4244;4245;4512;4702;4530;4718;%(DisableSpecificWarnings)</DisableSpecificWarnings>
<FunctionLevelLinking>true</FunctionLevelLinking> <FunctionLevelLinking>true</FunctionLevelLinking>
<MinimalRebuild>false</MinimalRebuild> <MinimalRebuild>false</MinimalRebuild>
<Optimization>Disabled</Optimization> <Optimization>Disabled</Optimization>
...@@ -67,17 +67,17 @@ ...@@ -67,17 +67,17 @@
<TargetMachine>MachineX86</TargetMachine> <TargetMachine>MachineX86</TargetMachine>
</Link> </Link>
<ResourceCompile> <ResourceCompile>
<AdditionalIncludeDirectories>..\..\samples\gles2_book\Common;..\..\include;C:\Program Files (x86)\Windows Kits\8.0\Include\shared;C:\Program Files (x86)\Windows Kits\8.0\Include\um;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories> <AdditionalIncludeDirectories>..\..\include;..\..\samples\angle\sample_util;C:\Program Files (x86)\Windows Kits\8.0\Include\shared;C:\Program Files (x86)\Windows Kits\8.0\Include\um;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<Culture>0x0409</Culture> <Culture>0x0409</Culture>
</ResourceCompile> </ResourceCompile>
</ItemDefinitionGroup> </ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'"> <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<ClCompile> <ClCompile>
<AdditionalIncludeDirectories>..\..\samples\gles2_book\Common;..\..\include;C:\Program Files (x86)\Windows Kits\8.0\Include\shared;C:\Program Files (x86)\Windows Kits\8.0\Include\um;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories> <AdditionalIncludeDirectories>..\..\include;..\..\samples\angle\sample_util;C:\Program Files (x86)\Windows Kits\8.0\Include\shared;C:\Program Files (x86)\Windows Kits\8.0\Include\um;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalOptions>/MP %(AdditionalOptions)</AdditionalOptions> <AdditionalOptions>/MP %(AdditionalOptions)</AdditionalOptions>
<BufferSecurityCheck>true</BufferSecurityCheck> <BufferSecurityCheck>true</BufferSecurityCheck>
<DebugInformationFormat>ProgramDatabase</DebugInformationFormat> <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
<DisableSpecificWarnings>4100;4127;4189;4239;4244;4245;4512;4702;4530;4718;%(DisableSpecificWarnings)</DisableSpecificWarnings> <DisableSpecificWarnings>4201;4100;4127;4189;4239;4244;4245;4512;4702;4530;4718;%(DisableSpecificWarnings)</DisableSpecificWarnings>
<FunctionLevelLinking>true</FunctionLevelLinking> <FunctionLevelLinking>true</FunctionLevelLinking>
<MinimalRebuild>false</MinimalRebuild> <MinimalRebuild>false</MinimalRebuild>
<Optimization>MaxSpeed</Optimization> <Optimization>MaxSpeed</Optimization>
...@@ -102,7 +102,7 @@ ...@@ -102,7 +102,7 @@
<TargetMachine>MachineX86</TargetMachine> <TargetMachine>MachineX86</TargetMachine>
</Link> </Link>
<ResourceCompile> <ResourceCompile>
<AdditionalIncludeDirectories>..\..\samples\gles2_book\Common;..\..\include;C:\Program Files (x86)\Windows Kits\8.0\Include\shared;C:\Program Files (x86)\Windows Kits\8.0\Include\um;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories> <AdditionalIncludeDirectories>..\..\include;..\..\samples\angle\sample_util;C:\Program Files (x86)\Windows Kits\8.0\Include\shared;C:\Program Files (x86)\Windows Kits\8.0\Include\um;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<Culture>0x0409</Culture> <Culture>0x0409</Culture>
</ResourceCompile> </ResourceCompile>
</ItemDefinitionGroup> </ItemDefinitionGroup>
...@@ -110,19 +110,19 @@ ...@@ -110,19 +110,19 @@
<None Include="..\..\samples\samples.gyp"/> <None Include="..\..\samples\samples.gyp"/>
</ItemGroup> </ItemGroup>
<ItemGroup> <ItemGroup>
<ClCompile Include="..\..\samples\gles2_book\ParticleSystem\ParticleSystem.c"/> <ClCompile Include="..\..\samples\angle\particle_system\ParticleSystem.cpp"/>
</ItemGroup> </ItemGroup>
<ItemGroup> <ItemGroup>
<CustomBuild Include="..\..\samples\gles2_book\ParticleSystem\smoke.tga"> <CustomBuild Include="..\..\samples\angle\particle_system\smoke.tga">
<FileType>Document</FileType> <FileType>Document</FileType>
<Command>call mkdir &quot;$(OutDir)&quot; 2&gt;nul &amp; set ERRORLEVEL=0 &amp; copy /Y &quot;..\..\samples\gles2_book\ParticleSystem\smoke.tga&quot; &quot;$(OutDir)smoke.tga&quot;</Command> <Command>call mkdir &quot;$(OutDir)&quot; 2&gt;nul &amp; set ERRORLEVEL=0 &amp; copy /Y &quot;..\..\samples\angle\particle_system\smoke.tga&quot; &quot;$(OutDir)smoke.tga&quot;</Command>
<Message>Copying gles2_book/ParticleSystem/smoke.tga to $(OutDir)\smoke.tga</Message> <Message>Copying angle/particle_system/smoke.tga to $(OutDir)\smoke.tga</Message>
<Outputs>$(OutDir)\smoke.tga</Outputs> <Outputs>$(OutDir)\smoke.tga</Outputs>
</CustomBuild> </CustomBuild>
</ItemGroup> </ItemGroup>
<ItemGroup> <ItemGroup>
<ProjectReference Include="es_util.vcxproj"> <ProjectReference Include="sample_util.vcxproj">
<Project>{80E5C3D9-93C2-943E-176F-C9A903E27BC9}</Project> <Project>{297C46B0-9263-A9EA-82B1-EA221E7D7C7F}</Project>
<ReferenceOutputAssembly>false</ReferenceOutputAssembly> <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
</ProjectReference> </ProjectReference>
<ProjectReference Include="..\src\libEGL.vcxproj"> <ProjectReference Include="..\src\libEGL.vcxproj">
......
projects/samples/particle_system.vcxproj.filters
<?xml version="1.0" encoding="utf-8"?> <?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup> <ItemGroup>
<Filter Include="gles2_book"> <Filter Include="angle">
<UniqueIdentifier>{01DCD872-C931-E1FA-4F9F-EBFA79587BB6}</UniqueIdentifier> <UniqueIdentifier>{2039F76D-4C9A-B8A0-444A-4766C6F6104A}</UniqueIdentifier>
</Filter> </Filter>
<Filter Include="gles2_book\ParticleSystem"> <Filter Include="angle\particle_system">
<UniqueIdentifier>{05979F6F-F708-2C87-17F3-3B3AA4892DDF}</UniqueIdentifier> <UniqueIdentifier>{BF3D6113-EF81-F63D-D06D-FD080BFBE471}</UniqueIdentifier>
</Filter> </Filter>
</ItemGroup> </ItemGroup>
<ItemGroup> <ItemGroup>
<None Include="..\..\samples\samples.gyp"/> <None Include="..\..\samples\samples.gyp"/>
<ClCompile Include="..\..\samples\gles2_book\ParticleSystem\ParticleSystem.c"> <ClCompile Include="..\..\samples\angle\particle_system\ParticleSystem.cpp">
<Filter>gles2_book\ParticleSystem</Filter> <Filter>angle\particle_system</Filter>
</ClCompile> </ClCompile>
<None Include="..\..\samples\gles2_book\ParticleSystem\smoke.tga"> <None Include="..\..\samples\angle\particle_system\smoke.tga">
<Filter>gles2_book\ParticleSystem</Filter> <Filter>angle\particle_system</Filter>
</None> </None>
</ItemGroup> </ItemGroup>
</Project> </Project>
projects/samples/samples.sln
...@@ -61,7 +61,7 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "multi_texture", "multi_text ...@@ -61,7 +61,7 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "multi_texture", "multi_text
EndProject EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "particle_system", "particle_system.vcxproj", "{8C20B90A-FBCB-B63F-435A-3299A1C38B2C}" Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "particle_system", "particle_system.vcxproj", "{8C20B90A-FBCB-B63F-435A-3299A1C38B2C}"
ProjectSection(ProjectDependencies) = postProject ProjectSection(ProjectDependencies) = postProject
{80E5C3D9-93C2-943E-176F-C9A903E27BC9} = {80E5C3D9-93C2-943E-176F-C9A903E27BC9} {297C46B0-9263-A9EA-82B1-EA221E7D7C7F} = {297C46B0-9263-A9EA-82B1-EA221E7D7C7F}
{FBAEE4F6-562A-588F-01F9-72DCABB3B061} = {FBAEE4F6-562A-588F-01F9-72DCABB3B061} {FBAEE4F6-562A-588F-01F9-72DCABB3B061} = {FBAEE4F6-562A-588F-01F9-72DCABB3B061}
{7FBD6F69-B9A4-69F1-A12B-8DACB3F8CD81} = {7FBD6F69-B9A4-69F1-A12B-8DACB3F8CD81} {7FBD6F69-B9A4-69F1-A12B-8DACB3F8CD81} = {7FBD6F69-B9A4-69F1-A12B-8DACB3F8CD81}
EndProjectSection EndProjectSection
......
samples/angle/particle_system/ParticleSystem.cpp 0 → 100644
//
// Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Based on ParticleSystem.c from
// Book: OpenGL(R) ES 2.0 Programming Guide
// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner
// ISBN-10: 0321502795
// ISBN-13: 9780321502797
// Publisher: Addison-Wesley Professional
// URLs: http://safari.informit.com/9780321563835
// http://www.opengles-book.com
#include "SampleApplication.h"
#include "Vector.h"
#include "shader_utils.h"
#include "random_utils.h"
#include "tga_utils.h"
#include "path_utils.h"
#define _USE_MATH_DEFINES
#include <math.h>
class ParticleSystemSample : public SampleApplication
{
public:
ParticleSystemSample::ParticleSystemSample()
: SampleApplication("ParticleSystem", 1280, 720)
{
}
virtual bool initialize()
{
const std::string vs = SHADER_SOURCE
(
uniform float u_time;
uniform vec3 u_centerPosition;
attribute float a_lifetime;
attribute vec3 a_startPosition;
attribute vec3 a_endPosition;
varying float v_lifetime;
void main()
{
if (u_time <= a_lifetime)
{
gl_Position.xyz = a_startPosition + (u_time * a_endPosition);
gl_Position.xyz += u_centerPosition;
gl_Position.w = 1.0;
}
else
{
gl_Position = vec4(-1000, -1000, 0, 0);
}
v_lifetime = 1.0 - (u_time / a_lifetime);
v_lifetime = clamp(v_lifetime, 0.0, 1.0);
gl_PointSize = (v_lifetime * v_lifetime) * 40.0;
}
);
const std::string fs = SHADER_SOURCE
(
precision mediump float;
uniform vec4 u_color;
varying float v_lifetime;
uniform sampler2D s_texture;
void main()
{
vec4 texColor;
texColor = texture2D(s_texture, gl_PointCoord);
gl_FragColor = vec4(u_color) * texColor;
gl_FragColor.a *= v_lifetime;
}
);
mProgram = CompileProgram(vs, fs);
if (!mProgram)
{
return false;
}
// Get the attribute locations
mLifetimeLoc = glGetAttribLocation(mProgram, "a_lifetime");
mStartPositionLoc = glGetAttribLocation(mProgram, "a_startPosition");
mEndPositionLoc = glGetAttribLocation(mProgram, "a_endPosition");
// Get the uniform locations
mTimeLoc = glGetUniformLocation(mProgram, "u_time");
mCenterPositionLoc = glGetUniformLocation(mProgram, "u_centerPosition");
mColorLoc = glGetUniformLocation(mProgram, "u_color");
mSamplerLoc = glGetUniformLocation(mProgram, "s_texture");
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
// Fill in particle data array
for (size_t i = 0; i < mParticleCount; i++)
{
mParticles[i].lifetime = RandomBetween(0.0f, 1.0f);
float endAngle = RandomBetween(0, 2.0f * float(M_PI));
float endRadius = RandomBetween(0.0f, 2.0f);
mParticles[i].endPosition.x = sinf(endAngle) * endRadius;
mParticles[i].endPosition.y = cosf(endAngle) * endRadius;
mParticles[i].endPosition.z = 0.0f;
float startAngle = RandomBetween(0, 2.0f * float(M_PI));
float startRadius = RandomBetween(0.0f, 0.25f);
mParticles[i].startPosition.x = sinf(startAngle) * startRadius;
mParticles[i].startPosition.y = cosf(startAngle) * startRadius;
mParticles[i].startPosition.z = 0.0f;
}
mParticleTime = 1.0f;
TGAImage img;
if (!LoadTGAImageFromFile(GetExecutableDirectory() + "/smoke.tga", &img))
{
return false;
}
mTextureID = LoadTextureFromTGAImage(img);
if (!mTextureID)
{
return false;
}
return true;
}
virtual void destroy()
{
glDeleteProgram(mProgram);
}
virtual void step(float dt, double totalTime)
{
// Use the program object
glUseProgram(mProgram);
mParticleTime += dt;
if (mParticleTime >= 1.0f)
{
mParticleTime = 0.0f;
// Pick a new start location and color
Vector3 centerPos(RandomBetween(-0.5f, 0.5f),
RandomBetween(-0.5f, 0.5f),
RandomBetween(-0.5f, 0.5f));
glUniform3fv(mCenterPositionLoc, 1, centerPos.data);
// Random color
Vector4 color(RandomBetween(0.0f, 1.0f),
RandomBetween(0.0f, 1.0f),
RandomBetween(0.0f, 1.0f),
0.5f);
glUniform4fv(mColorLoc, 1, color.data);
}
// Load uniform time variable
glUniform1f(mTimeLoc, mParticleTime);
}
virtual void draw()
{
// Set the viewport
glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight());
// Clear the color buffer
glClear(GL_COLOR_BUFFER_BIT);
// Use the program object
glUseProgram(mProgram);
// Load the vertex attributes
glVertexAttribPointer(mLifetimeLoc, 1, GL_FLOAT, GL_FALSE, sizeof(Particle), &mParticles[0].lifetime);
glVertexAttribPointer(mEndPositionLoc, 3, GL_FLOAT, GL_FALSE, sizeof(Particle), &mParticles[0].endPosition);
glVertexAttribPointer(mStartPositionLoc, 3, GL_FLOAT, GL_FALSE, sizeof(Particle), &mParticles[0].startPosition);
glEnableVertexAttribArray(mLifetimeLoc);
glEnableVertexAttribArray(mEndPositionLoc);
glEnableVertexAttribArray(mStartPositionLoc);
// Blend particles
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
// Bind the texture
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, mTextureID);
// Set the sampler texture unit to 0
glUniform1i(mSamplerLoc, 0);
glDrawArrays(GL_POINTS, 0, mParticleCount);
}
private:
// Handle to a program object
GLuint mProgram;
// Attribute locations
GLint mLifetimeLoc;
GLint mStartPositionLoc;
GLint mEndPositionLoc;
// Uniform location
GLint mTimeLoc;
GLint mColorLoc;
GLint mCenterPositionLoc;
GLint mSamplerLoc;
// Texture handle
GLuint mTextureID;
// Particle vertex data
struct Particle
{
float lifetime;
Vector3 startPosition;
Vector3 endPosition;
};
static const size_t mParticleCount = 1024;
std::array<Particle, mParticleCount> mParticles;
float mParticleTime;
};
int main(int argc, char **argv)
{
ParticleSystemSample app;
return app.run();
}
samples/gles2_book/ParticleSystem/ParticleSystem.c deleted 100644 → 0
//
// Book: OpenGL(R) ES 2.0 Programming Guide
// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner
// ISBN-10: 0321502795
// ISBN-13: 9780321502797
// Publisher: Addison-Wesley Professional
// URLs: http://safari.informit.com/9780321563835
// http://www.opengles-book.com
//
// ParticleSystem.c
//
// This is an example that demonstrates rendering a particle system
// using a vertex shader and point sprites.
//
#include <stdlib.h>
#include <math.h>
#include "esUtil.h"
#define NUM_PARTICLES 1000
#define PARTICLE_SIZE 7
typedef struct
{
// Handle to a program object
GLuint programObject;
// Attribute locations
GLint lifetimeLoc;
GLint startPositionLoc;
GLint endPositionLoc;
// Uniform location
GLint timeLoc;
GLint colorLoc;
GLint centerPositionLoc;
GLint samplerLoc;
// Texture handle
GLuint textureId;
// Particle vertex data
float particleData[ NUM_PARTICLES * PARTICLE_SIZE ];
// Current time
float time;
} UserData;
///
// Load texture from disk
//
GLuint LoadTexture ( char *fileName )
{
int width,
height;
char *buffer = esLoadTGA ( fileName, &width, &height );
GLuint texId;
if ( buffer == NULL )
{
esLogMessage ( "Error loading (%s) image.\n", fileName );
return 0;
}
glGenTextures ( 1, &texId );
glBindTexture ( GL_TEXTURE_2D, texId );
glTexImage2D ( GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, buffer );
glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
free ( buffer );
return texId;
}
///
// Initialize the shader and program object
//
int Init ( ESContext *esContext )
{
UserData *userData = esContext->userData;
int i;
GLbyte vShaderStr[] =
"uniform float u_time; \n"
"uniform vec3 u_centerPosition; \n"
"attribute float a_lifetime; \n"
"attribute vec3 a_startPosition; \n"
"attribute vec3 a_endPosition; \n"
"varying float v_lifetime; \n"
"void main() \n"
"{ \n"
" if ( u_time <= a_lifetime ) \n"
" { \n"
" gl_Position.xyz = a_startPosition + \n"
" (u_time * a_endPosition); \n"
" gl_Position.xyz += u_centerPosition; \n"
" gl_Position.w = 1.0; \n"
" } \n"
" else \n"
" gl_Position = vec4( -1000, -1000, 0, 0 ); \n"
" v_lifetime = 1.0 - ( u_time / a_lifetime ); \n"
" v_lifetime = clamp ( v_lifetime, 0.0, 1.0 ); \n"
" gl_PointSize = ( v_lifetime * v_lifetime ) * 40.0; \n"
"}";
GLbyte fShaderStr[] =
"precision mediump float; \n"
"uniform vec4 u_color; \n"
"varying float v_lifetime; \n"
"uniform sampler2D s_texture; \n"
"void main() \n"
"{ \n"
" vec4 texColor; \n"
" texColor = texture2D( s_texture, gl_PointCoord ); \n"
" gl_FragColor = vec4( u_color ) * texColor; \n"
" gl_FragColor.a *= v_lifetime; \n"
"} \n";
// Load the shaders and get a linked program object
userData->programObject = esLoadProgram ( vShaderStr, fShaderStr );
// Get the attribute locations
userData->lifetimeLoc = glGetAttribLocation ( userData->programObject, "a_lifetime" );
userData->startPositionLoc = glGetAttribLocation ( userData->programObject, "a_startPosition" );
userData->endPositionLoc = glGetAttribLocation ( userData->programObject, "a_endPosition" );
// Get the uniform locations
userData->timeLoc = glGetUniformLocation ( userData->programObject, "u_time" );
userData->centerPositionLoc = glGetUniformLocation ( userData->programObject, "u_centerPosition" );
userData->colorLoc = glGetUniformLocation ( userData->programObject, "u_color" );
userData->samplerLoc = glGetUniformLocation ( userData->programObject, "s_texture" );
glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f );
// Fill in particle data array
srand ( 0 );
for ( i = 0; i < NUM_PARTICLES; i++ )
{
float *particleData = &userData->particleData[i * PARTICLE_SIZE];
// Lifetime of particle
(*particleData++) = ( (float)(rand() % 10000) / 10000.0f );
// End position of particle
(*particleData++) = ( (float)(rand() % 10000) / 5000.0f ) - 1.0f;
(*particleData++) = ( (float)(rand() % 10000) / 5000.0f ) - 1.0f;
(*particleData++) = ( (float)(rand() % 10000) / 5000.0f ) - 1.0f;
// Start position of particle
(*particleData++) = ( (float)(rand() % 10000) / 40000.0f ) - 0.125f;
(*particleData++) = ( (float)(rand() % 10000) / 40000.0f ) - 0.125f;
(*particleData++) = ( (float)(rand() % 10000) / 40000.0f ) - 0.125f;
}
// Initialize time to cause reset on first update
userData->time = 1.0f;
userData->textureId = LoadTexture ( "smoke.tga" );
if ( userData->textureId <= 0 )
{
return FALSE;
}
return TRUE;
}
///
// Update time-based variables
//
void Update ( ESContext *esContext, float deltaTime )
{
UserData *userData = esContext->userData;
userData->time += deltaTime;
if ( userData->time >= 1.0f )
{
float centerPos[3];
float color[4];
userData->time = 0.0f;
// Pick a new start location and color
centerPos[0] = ( (float)(rand() % 10000) / 10000.0f ) - 0.5f;
centerPos[1] = ( (float)(rand() % 10000) / 10000.0f ) - 0.5f;
centerPos[2] = ( (float)(rand() % 10000) / 10000.0f ) - 0.5f;
glUniform3fv ( userData->centerPositionLoc, 1, &centerPos[0] );
// Random color
color[0] = ( (float)(rand() % 10000) / 20000.0f ) + 0.5f;
color[1] = ( (float)(rand() % 10000) / 20000.0f ) + 0.5f;
color[2] = ( (float)(rand() % 10000) / 20000.0f ) + 0.5f;
color[3] = 0.5;
glUniform4fv ( userData->colorLoc, 1, &color[0] );
}
// Load uniform time variable
glUniform1f ( userData->timeLoc, userData->time );
}
///
// Draw a triangle using the shader pair created in Init()
//
void Draw ( ESContext *esContext )
{
UserData *userData = esContext->userData;
// Set the viewport
glViewport ( 0, 0, esContext->width, esContext->height );
// Clear the color buffer
glClear ( GL_COLOR_BUFFER_BIT );
// Use the program object
glUseProgram ( userData->programObject );
// Load the vertex attributes
glVertexAttribPointer ( userData->lifetimeLoc, 1, GL_FLOAT,
GL_FALSE, PARTICLE_SIZE * sizeof(GLfloat),
userData->particleData );
glVertexAttribPointer ( userData->endPositionLoc, 3, GL_FLOAT,
GL_FALSE, PARTICLE_SIZE * sizeof(GLfloat),
&userData->particleData[1] );
glVertexAttribPointer ( userData->startPositionLoc, 3, GL_FLOAT,
GL_FALSE, PARTICLE_SIZE * sizeof(GLfloat),
&userData->particleData[4] );
glEnableVertexAttribArray ( userData->lifetimeLoc );
glEnableVertexAttribArray ( userData->endPositionLoc );
glEnableVertexAttribArray ( userData->startPositionLoc );
// Blend particles
glEnable ( GL_BLEND );
glBlendFunc ( GL_SRC_ALPHA, GL_ONE );
// Bind the texture
glActiveTexture ( GL_TEXTURE0 );
glBindTexture ( GL_TEXTURE_2D, userData->textureId );
glEnable ( GL_TEXTURE_2D );
// Set the sampler texture unit to 0
glUniform1i ( userData->samplerLoc, 0 );
glDrawArrays( GL_POINTS, 0, NUM_PARTICLES );
eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface );
}
///
// Cleanup
//
void ShutDown ( ESContext *esContext )
{
UserData *userData = esContext->userData;
// Delete texture object
glDeleteTextures ( 1, &userData->textureId );
// Delete program object
glDeleteProgram ( userData->programObject );
}
int main ( int argc, char *argv[] )
{
ESContext esContext;
UserData userData;
esInitContext ( &esContext );
esContext.userData = &userData;
esCreateWindow ( &esContext, TEXT("ParticleSystem"), 640, 480, ES_WINDOW_RGB );
if ( !Init ( &esContext ) )
return 0;
esRegisterDrawFunc ( &esContext, Draw );
esRegisterUpdateFunc ( &esContext, Update );
esMainLoop ( &esContext );
ShutDown ( &esContext );
}
samples/samples.gyp
...@@ -130,13 +130,13 @@ ...@@ -130,13 +130,13 @@
{ {
'target_name': 'particle_system', 'target_name': 'particle_system',
'type': 'executable', 'type': 'executable',
'dependencies': [ 'es_util' ], 'dependencies': [ 'sample_util' ],
'sources': [ '<!@(python <(angle_path)/enumerate_files.py gles2_book/ParticleSystem -types *.c *.h)' ], 'sources': [ '<!@(python <(angle_path)/enumerate_files.py angle/particle_system -types *.cpp *.h)' ],
'copies': 'copies':
[ [
{ {
'destination': '<(PRODUCT_DIR)', 'destination': '<(PRODUCT_DIR)',
'files': [ '<!@(python <(angle_path)/enumerate_files.py gles2_book/ParticleSystem -types *.tga)' ], 'files': [ '<!@(python <(angle_path)/enumerate_files.py angle/particle_system -types *.tga)' ],
} }
] ]
}, },
......
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