|
1
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
2
|
// Copyright 2017 Leszek Koltunski //
|
|
3
|
// //
|
|
4
|
// This file is part of Distorted. //
|
|
5
|
// //
|
|
6
|
// Distorted is free software: you can redistribute it and/or modify //
|
|
7
|
// it under the terms of the GNU General Public License as published by //
|
|
8
|
// the Free Software Foundation, either version 2 of the License, or //
|
|
9
|
// (at your option) any later version. //
|
|
10
|
// //
|
|
11
|
// Distorted is distributed in the hope that it will be useful, //
|
|
12
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
13
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
14
|
// GNU General Public License for more details. //
|
|
15
|
// //
|
|
16
|
// You should have received a copy of the GNU General Public License //
|
|
17
|
// along with Distorted. If not, see <http://www.gnu.org/licenses/>. //
|
|
18
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
19
|
|
|
20
|
package org.distorted.library.effect;
|
|
21
|
|
|
22
|
import android.opengl.GLES31;
|
|
23
|
|
|
24
|
import org.distorted.library.main.Distorted;
|
|
25
|
import org.distorted.library.main.DistortedFramebuffer;
|
|
26
|
import org.distorted.library.main.DistortedRenderState;
|
|
27
|
import org.distorted.library.program.DistortedProgram;
|
|
28
|
import org.distorted.library.type.Data1D;
|
|
29
|
import org.distorted.library.type.Data4D;
|
|
30
|
|
|
31
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
32
|
/**
|
|
33
|
* Add a (colored) glow around an object.
|
|
34
|
*/
|
|
35
|
public class PostprocessEffectGlow extends PostprocessEffect
|
|
36
|
{
|
|
37
|
private static final int MAX_HALO = 50;
|
|
38
|
|
|
39
|
private Data1D mGlowRadius;
|
|
40
|
private Data4D mColor;
|
|
41
|
|
|
42
|
private static final float GAUSSIAN[] = // G(0.00), G(0.03), G(0.06), ..., G(3.00), 0
|
|
43
|
{ // where G(x)= (1/(sqrt(2*PI))) * e^(-(x^2)/2). The last 0 terminates.
|
|
44
|
0.398948f, 0.398769f, 0.398231f, 0.397336f, 0.396086f, 0.394485f, 0.392537f, 0.390247f, 0.387622f, 0.384668f,
|
|
45
|
0.381393f, 0.377806f, 0.373916f, 0.369733f, 0.365268f, 0.360532f, 0.355538f, 0.350297f, 0.344823f, 0.339129f,
|
|
46
|
0.333229f, 0.327138f, 0.320868f, 0.314436f, 0.307856f, 0.301142f, 0.294309f, 0.287373f, 0.280348f, 0.273248f,
|
|
47
|
0.266089f, 0.258884f, 0.251648f, 0.244394f, 0.237135f, 0.229886f, 0.222657f, 0.215461f, 0.208311f, 0.201217f,
|
|
48
|
0.194189f, 0.187238f, 0.180374f, 0.173605f, 0.166940f, 0.160386f, 0.153951f, 0.147641f, 0.141462f, 0.135420f,
|
|
49
|
0.129520f, 0.123765f, 0.118159f, 0.112706f, 0.107408f, 0.102266f, 0.097284f, 0.092461f, 0.087797f, 0.083294f,
|
|
50
|
0.078951f, 0.074767f, 0.070741f, 0.066872f, 0.063158f, 0.059596f, 0.056184f, 0.052920f, 0.049801f, 0.046823f,
|
|
51
|
0.043984f, 0.041280f, 0.038707f, 0.036262f, 0.033941f, 0.031740f, 0.029655f, 0.027682f, 0.025817f, 0.024056f,
|
|
52
|
0.022395f, 0.020830f, 0.019357f, 0.017971f, 0.016670f, 0.015450f, 0.014305f, 0.013234f, 0.012232f, 0.011295f,
|
|
53
|
0.010421f, 0.009606f, 0.008847f, 0.008140f, 0.007483f, 0.006873f, 0.006307f, 0.005782f, 0.005296f, 0.004847f,
|
|
54
|
0.004432f, 0.000000f
|
|
55
|
};
|
|
56
|
private static final int NUM_GAUSSIAN = GAUSSIAN.length-2;
|
|
57
|
|
|
58
|
// The (fixed-function-sampled) Gaussian Blur kernels are of the size k0=1, k1=2, k2=2, k3=3, k4=3, k5=4, k6=4,...
|
|
59
|
// i.e. k(i)=floor((i+3)/2). (the 'i' in k(i) means 'blur taking into account the present pixel and 'i' pixels
|
|
60
|
// in all 4 directions)
|
|
61
|
// We need room for MAX_BLUR of them, and sum(i=0...N, floor((i+3)/2)) = N + floor(N*N/4)
|
|
62
|
private static float[] weightsCache = new float[MAX_HALO + MAX_HALO*MAX_HALO/4];
|
|
63
|
private static float[] offsetsCache = new float[MAX_HALO + MAX_HALO*MAX_HALO/4];
|
|
64
|
private static float[] mWeights = new float[MAX_HALO];
|
|
65
|
private static float[] mOffsets = new float[MAX_HALO];
|
|
66
|
|
|
67
|
private static DistortedProgram mProgram1, mProgram2;
|
|
68
|
private static int mIndex1, mIndex2;
|
|
69
|
|
|
70
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
71
|
// This implements the 'Better separable implementation using GPU fixed function sampling' from
|
|
72
|
// https://software.intel.com/en-us/blogs/2014/07/15/an-investigation-of-fast-real-time-gpu-based-image-blur-algorithms
|
|
73
|
|
|
74
|
private void computeGaussianKernel(int radius)
|
|
75
|
{
|
|
76
|
int offset = radius + radius*radius/4;
|
|
77
|
|
|
78
|
if( weightsCache[offset]==0.0f )
|
|
79
|
{
|
|
80
|
float z, x= 0.0f, P= (float)NUM_GAUSSIAN / (radius>3 ? radius:3);
|
|
81
|
mWeights[0] = GAUSSIAN[0];
|
|
82
|
float sum = GAUSSIAN[0];
|
|
83
|
int j;
|
|
84
|
|
|
85
|
for(int i=1; i<=radius; i++)
|
|
86
|
{
|
|
87
|
x += P;
|
|
88
|
j = (int)x;
|
|
89
|
z = x-j;
|
|
90
|
|
|
91
|
mWeights[i] = (1-z)*GAUSSIAN[j] + z*GAUSSIAN[j+1];
|
|
92
|
sum += 2*mWeights[i];
|
|
93
|
}
|
|
94
|
|
|
95
|
for(int i=0; i<=radius; i++) mWeights[i] /= sum;
|
|
96
|
|
|
97
|
int numloops = radius/2;
|
|
98
|
weightsCache[offset] = mWeights[0];
|
|
99
|
offsetsCache[offset] = 0.0f;
|
|
100
|
|
|
101
|
for(int i=0; i<numloops; i++)
|
|
102
|
{
|
|
103
|
offsetsCache[offset+i+1] = mWeights[2*i+1]*(2*i+1) + mWeights[2*i+2]*(2*i+2);
|
|
104
|
weightsCache[offset+i+1] = mWeights[2*i+1] + mWeights[2*i+2];
|
|
105
|
offsetsCache[offset+i+1]/= weightsCache[offset+i+1];
|
|
106
|
}
|
|
107
|
|
|
108
|
if( radius%2 == 1 )
|
|
109
|
{
|
|
110
|
int index = offset + radius/2 +1;
|
|
111
|
offsetsCache[index]=radius;
|
|
112
|
weightsCache[index]=mWeights[radius];
|
|
113
|
}
|
|
114
|
}
|
|
115
|
}
|
|
116
|
|
|
117
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
118
|
/**
|
|
119
|
* Only for use by the library itself.
|
|
120
|
*
|
|
121
|
* @y.exclude
|
|
122
|
*/
|
|
123
|
public boolean compute(float[] uniforms, int index, long currentDuration, long step )
|
|
124
|
{
|
|
125
|
mColor.get(uniforms,index+1,currentDuration,step);
|
|
126
|
return mGlowRadius.get(uniforms,index,currentDuration,step);
|
|
127
|
}
|
|
128
|
|
|
129
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
130
|
/**
|
|
131
|
* Only for use by the library itself.
|
|
132
|
*
|
|
133
|
* @y.exclude
|
|
134
|
*/
|
|
135
|
public boolean getRender()
|
|
136
|
{
|
|
137
|
return true;
|
|
138
|
}
|
|
139
|
|
|
140
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
141
|
/**
|
|
142
|
* Only for use by the library itself.
|
|
143
|
*
|
|
144
|
* @y.exclude
|
|
145
|
*/
|
|
146
|
public int apply(float[] uniforms, int index, DistortedFramebuffer buffer)
|
|
147
|
{
|
|
148
|
if( mProgram1 ==null)
|
|
149
|
{
|
|
150
|
try
|
|
151
|
{
|
|
152
|
mProgram1 = mPrograms.get(mIndex1);
|
|
153
|
mProgram2 = mPrograms.get(mIndex2);
|
|
154
|
}
|
|
155
|
catch(Exception ex)
|
|
156
|
{
|
|
157
|
return 0;
|
|
158
|
}
|
|
159
|
}
|
|
160
|
|
|
161
|
DistortedRenderState.useStencilMark();
|
|
162
|
|
|
163
|
buffer.setAsOutput();
|
|
164
|
|
|
165
|
float w= buffer.getWidth();
|
|
166
|
float h= buffer.getHeight();
|
|
167
|
float n= 1.0f - buffer.getNear();
|
|
168
|
|
|
169
|
float corrW = buffer.getWidthCorrection();
|
|
170
|
float corrH = buffer.getHeightCorrection();
|
|
171
|
float offsetCorrW = corrW/w;
|
|
172
|
float offsetCorrH = corrH/h;
|
|
173
|
|
|
174
|
int radius = (int)(uniforms[index]*mQualityScale);
|
|
175
|
if( radius>=MAX_HALO ) radius = MAX_HALO-1;
|
|
176
|
computeGaussianKernel(radius);
|
|
177
|
|
|
178
|
int offset = radius + radius*radius/4;
|
|
179
|
radius = (radius+1)/2;
|
|
180
|
GLES31.glViewport(0, 0, (int)w, (int)h);
|
|
181
|
|
|
182
|
// horizontal blur
|
|
183
|
for(int i=0; i<=radius; i++) mOffsets[i] = offsetsCache[offset+i]*offsetCorrW;
|
|
184
|
|
|
185
|
mProgram1.useProgram();
|
|
186
|
buffer.bindForOutput(1);
|
|
187
|
buffer.setAsInput(0);
|
|
188
|
|
|
189
|
GLES31.glColorMask(true,true,true,true);
|
|
190
|
GLES31.glClearColor(1.0f,1.0f,1.0f,0.0f);
|
|
191
|
GLES31.glClear(GLES31.GL_COLOR_BUFFER_BIT);
|
|
192
|
|
|
193
|
GLES31.glUniform1f ( mProgram1.mUniform[0] , n );
|
|
194
|
GLES31.glUniform2f ( mProgram1.mUniform[1] , corrW, corrH );
|
|
195
|
GLES31.glUniform1i ( mProgram1.mUniform[2] , 0 );
|
|
196
|
GLES31.glUniform1fv( mProgram1.mUniform[3] , radius+1, mOffsets,0);
|
|
197
|
GLES31.glUniform1fv( mProgram1.mUniform[4] , radius+1, weightsCache,offset);
|
|
198
|
GLES31.glUniform1i ( mProgram1.mUniform[5] , radius);
|
|
199
|
GLES31.glVertexAttribPointer(mProgram1.mAttribute[0], POS_DATA_SIZE, GLES31.GL_FLOAT, false, 0, mQuadPositions);
|
|
200
|
GLES31.glVertexAttribPointer(mProgram1.mAttribute[1], TEX_DATA_SIZE, GLES31.GL_FLOAT, false, 0, mQuadTexture);
|
|
201
|
GLES31.glDrawArrays(GLES31.GL_TRIANGLE_STRIP, 0, 4);
|
|
202
|
|
|
203
|
// vertical blur
|
|
204
|
for(int i=0; i<=radius; i++) mOffsets[i] = offsetsCache[offset+i]*offsetCorrH;
|
|
205
|
|
|
206
|
mProgram2.useProgram();
|
|
207
|
buffer.bindForOutput(0);
|
|
208
|
buffer.setAsInput(1);
|
|
209
|
|
|
210
|
GLES31.glClear(GLES31.GL_COLOR_BUFFER_BIT);
|
|
211
|
|
|
212
|
GLES31.glUniform1f ( mProgram2.mUniform[0] , n );
|
|
213
|
GLES31.glUniform2f ( mProgram2.mUniform[1] , corrW, corrH );
|
|
214
|
GLES31.glUniform1i ( mProgram2.mUniform[2] , 0 );
|
|
215
|
GLES31.glUniform1fv( mProgram2.mUniform[3] , radius+1, mOffsets,0);
|
|
216
|
GLES31.glUniform1fv( mProgram2.mUniform[4] , radius+1, weightsCache,offset);
|
|
217
|
GLES31.glUniform1i ( mProgram2.mUniform[5] , radius);
|
|
218
|
GLES31.glVertexAttribPointer(mProgram2.mAttribute[0], POS_DATA_SIZE, GLES31.GL_FLOAT, false, 0, mQuadPositions);
|
|
219
|
GLES31.glVertexAttribPointer(mProgram2.mAttribute[1], TEX_DATA_SIZE, GLES31.GL_FLOAT, false, 0, mQuadTexture);
|
|
220
|
GLES31.glDrawArrays(GLES31.GL_TRIANGLE_STRIP, 0, 4);
|
|
221
|
|
|
222
|
DistortedRenderState.unuseStencilMark();
|
|
223
|
|
|
224
|
return 2;
|
|
225
|
}
|
|
226
|
|
|
227
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
228
|
// PUBLIC API
|
|
229
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
230
|
/**
|
|
231
|
* Have to call this before the shaders get compiled (i.e before Distorted.onCreate()) for the Effect to work.
|
|
232
|
*/
|
|
233
|
public static void enable()
|
|
234
|
{
|
|
235
|
final String glowVertex =
|
|
236
|
|
|
237
|
Distorted.GLSL_VERSION +
|
|
238
|
"precision lowp float; \n"+
|
|
239
|
"in vec2 a_Position; \n"+
|
|
240
|
"in vec2 a_TexCoord; \n"+
|
|
241
|
"out vec2 v_TexCoord; \n"+
|
|
242
|
"uniform float u_Depth; \n"+
|
|
243
|
"uniform vec2 u_TexCorr;\n"+
|
|
244
|
|
|
245
|
"void main() \n"+
|
|
246
|
" { \n"+
|
|
247
|
" v_TexCoord = a_TexCoord * u_TexCorr; \n"+
|
|
248
|
" gl_Position= vec4(2.0*a_Position,u_Depth,1.0); \n"+
|
|
249
|
" }";
|
|
250
|
|
|
251
|
final String glowFragment1 =
|
|
252
|
|
|
253
|
Distorted.GLSL_VERSION +
|
|
254
|
"#define MAX_BLUR "+MAX_HALO+ "\n"+
|
|
255
|
"precision lowp float; \n"+
|
|
256
|
"in vec2 v_TexCoord; \n"+
|
|
257
|
"out vec4 fragColor; \n"+
|
|
258
|
"uniform sampler2D u_ColorTexture; \n"+
|
|
259
|
"uniform float u_Offsets[MAX_BLUR]; \n"+
|
|
260
|
"uniform float u_Weights[MAX_BLUR]; \n"+
|
|
261
|
"uniform int u_Radius; \n"+
|
|
262
|
|
|
263
|
"void main() \n"+
|
|
264
|
" { \n"+
|
|
265
|
" vec4 pixel= texture(u_ColorTexture,v_TexCoord) * u_Weights[0]; \n"+
|
|
266
|
" for (int i=1; i<=u_Radius; i+=1) \n"+
|
|
267
|
" { \n"+
|
|
268
|
" pixel += ( texture(u_ColorTexture,vec2(v_TexCoord.x+u_Offsets[i],v_TexCoord.y)) + \n"+
|
|
269
|
" texture(u_ColorTexture,vec2(v_TexCoord.x-u_Offsets[i],v_TexCoord.y)) ) * u_Weights[i]; \n"+
|
|
270
|
" } \n"+
|
|
271
|
" fragColor = pixel; \n"+
|
|
272
|
" }";
|
|
273
|
|
|
274
|
final String glowFragment2 =
|
|
275
|
|
|
276
|
Distorted.GLSL_VERSION +
|
|
277
|
"#define MAX_BLUR "+MAX_HALO+ "\n"+
|
|
278
|
"precision lowp float; \n"+
|
|
279
|
"in vec2 v_TexCoord; \n"+
|
|
280
|
"out vec4 fragColor; \n"+
|
|
281
|
"uniform sampler2D u_ColorTexture; \n"+
|
|
282
|
"uniform float u_Offsets[MAX_BLUR]; \n"+
|
|
283
|
"uniform float u_Weights[MAX_BLUR]; \n"+
|
|
284
|
"uniform int u_Radius; \n"+
|
|
285
|
|
|
286
|
"void main() \n"+
|
|
287
|
" { \n"+
|
|
288
|
" vec4 pixel= texture(u_ColorTexture,v_TexCoord) * u_Weights[0]; \n"+
|
|
289
|
" for (int i=1; i<=u_Radius; i+=1) \n"+
|
|
290
|
" { \n"+
|
|
291
|
" pixel += ( texture(u_ColorTexture,vec2(v_TexCoord.x,v_TexCoord.y+u_Offsets[i])) + \n"+
|
|
292
|
" texture(u_ColorTexture,vec2(v_TexCoord.x,v_TexCoord.y-u_Offsets[i])) ) * u_Weights[i]; \n"+
|
|
293
|
" } \n"+
|
|
294
|
" fragColor = pixel; \n"+
|
|
295
|
" }";
|
|
296
|
|
|
297
|
mIndex1 = PostprocessEffect.register("GLOW1", glowVertex,glowFragment1);
|
|
298
|
mIndex2 = PostprocessEffect.register("GLOW2", glowVertex,glowFragment2);
|
|
299
|
}
|
|
300
|
|
|
301
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
302
|
|
|
303
|
/**
|
|
304
|
* Make the object glow with a specific color and a halo of specific radius.
|
|
305
|
*
|
|
306
|
* @param glowRadius The 'strength' if the effect, in pixels. 0 = no halo, 10 = halo of roughly 10 pixels
|
|
307
|
* around the whole object.
|
|
308
|
* @param color RGBA of the color with which to draw the glow.
|
|
309
|
*/
|
|
310
|
public PostprocessEffectGlow(Data1D glowRadius, Data4D color)
|
|
311
|
{
|
|
312
|
super(EffectName.GLOW);
|
|
313
|
mGlowRadius = glowRadius;
|
|
314
|
mColor = color;
|
|
315
|
}
|
|
316
|
}
|