summaryrefslogtreecommitdiffstats
path: root/src/opengl/qglpixmapfilter.cpp
blob: ff23948a3cd74a4c5b64816ad56b640f97ca04d4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

#include "private/qpixmapfilter_p.h"
#include "qglpixmapfilter_p.h"
#include "qgraphicssystem_gl_p.h"
#include "qpaintengine_opengl_p.h"

#include "qglpixelbuffer.h"
#include "qglextensions_p.h"
#include "qgl_p.h"

#include "private/qapplication_p.h"


#ifndef GL_FRAGMENT_SHADER
#define GL_FRAGMENT_SHADER 0x8B30
#endif

#ifndef GL_COMPILE_STATUS
#define GL_COMPILE_STATUS 0x8B81
#endif

#ifndef GL_LINK_STATUS
#define GL_LINK_STATUS 0x8B82
#endif




QT_BEGIN_NAMESPACE


void QGLPixmapFilterBase::bindTexture(const QPixmap &src) const
{
    const_cast<QGLContext *>(QGLContext::currentContext())->d_func()->bindTexture(src, GL_TEXTURE_2D, GL_RGBA, true);
}

void QGLPixmapFilterBase::drawImpl(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF& source) const
{
    processGL(painter, pos, src, source);
}

QGLSLProgram::QGLSLProgram(const QString &src)
    : ctx(QGLContext::currentContext())
{
    if (!qt_resolve_glsl_extensions(const_cast<QGLContext *>(ctx))) {
        qWarning("Failed to resolve GLSL functions");
        m_valid = false;
        return;
    }

    m_shader = glCreateShader(GL_FRAGMENT_SHADER);

    const QByteArray src_ba = src.toAscii();
    const char *src_cstr = src_ba.constData();

    glShaderSource(m_shader, 1, &src_cstr, 0);
    glCompileShader(m_shader);
    glGetShaderiv(m_shader, GL_COMPILE_STATUS, &m_valid);
    if (!m_valid) {
        char data[4096];
        GLsizei len;
        glGetShaderInfoLog(m_shader, 4096, &len, data);
        qWarning("Failed to compile GLSL shader:\n%s\nCODE:\n%s\n", data, src_cstr);
        return;
    }

    m_program = glCreateProgram();
    glAttachShader(m_program, m_shader);
    glLinkProgram(m_program);
    glGetProgramiv(m_program, GL_LINK_STATUS, &m_valid);
    if (!m_valid) {
        char data[4096];
        GLsizei len;
        glGetShaderInfoLog(m_shader, 4096, &len, data);
        qWarning("Failed to link GLSL program:\n%s\nCODE:\n%s\n", data, src_cstr);
        return;
    }
}

QGLSLProgram::~QGLSLProgram()
{
    glDeleteProgram(m_program);
    glDeleteShader(m_shader);
}

bool QGLSLProgram::success() const
{
    return m_valid;
}

void QGLSLProgram::enable()
{
    glUseProgram(m_program);
}

void QGLSLProgram::disable()
{
    glUseProgram(0);
}

typedef GLuint (APIENTRY *_glGetUniformLocation) (GLuint, const char*);
typedef void (APIENTRY *_glUniform4fv) (GLint, GLsizei, GLfloat *);
typedef void (APIENTRY *_glUniform3fv) (GLint, GLsizei, GLfloat *);
typedef void (APIENTRY *_glUniform2fv) (GLint, GLsizei, GLfloat *);
typedef void (APIENTRY *_glUniform1fv) (GLint, GLsizei, GLfloat *);
typedef void (APIENTRY *_glUniform1i) (GLint, GLint);

int QGLSLProgram::getUniformLocation(const QString &name)
{
    return glGetUniformLocation(m_program, name.toAscii().constData());
}

void QGLSLProgram::setUniform(int uniform, int value)
{
    enable();
    glUniform1i(uniform, value);
}

void QGLSLProgram::setUniform(int uniform, qreal value)
{
    enable();
    GLfloat v[] = { value };
    glUniform1fv(uniform, 1, v);
}

void QGLSLProgram::setUniform(int uniform, qreal v1, qreal v2)
{
    enable();
    GLfloat v[] = { v1, v2 };
    glUniform2fv(uniform, 1, v);
}

void QGLSLProgram::setUniform(int uniform, qreal v1, qreal v2, qreal v3)
{
    enable();
    GLfloat v[] = { v1, v2, v3 };
    glUniform3fv(uniform, 1, v);
}

void QGLSLProgram::setUniform(int uniform, qreal v1, qreal v2, qreal v3, qreal v4)
{
    enable();
    GLfloat v[] = { v1, v2, v3, v4 };
    glUniform4fv(uniform, 1, v);
}

void QGLSLProgram::setUniform(int uniform, int count, float *v)
{
    enable();
    glUniform1fv(uniform, count, v);
}

class QGLPixmapColorizeFilter: public QGLPixmapFilter<QPixmapColorizeFilter>
{
public:
    QGLPixmapColorizeFilter();

protected:
    bool processGL(QPainter *painter, const QPointF &pos, const QPixmap &pixmap, const QRectF &srcRect) const;

private:
    mutable QGLSLProgram m_program;
    uint m_colorUniform;
};

class QGLPixmapConvolutionFilter: public QGLPixmapFilter<QPixmapConvolutionFilter>
{
public:
    QGLPixmapConvolutionFilter();
    ~QGLPixmapConvolutionFilter();

protected:
    bool processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const;

private:
    QString generateConvolutionShader() const;

    mutable QGLSLProgram *m_program;
    mutable uint m_scaleUniform;
    mutable uint m_matrixUniform;

    mutable int m_kernelWidth;
    mutable int m_kernelHeight;
};

extern QGLWidget *qt_gl_share_widget();

QPixmapFilter *QGLContextPrivate::createPixmapFilter(int type) const
{
    switch (type) {
    case QPixmapFilter::ColorizeFilter:
        return new QGLPixmapColorizeFilter;


    case QPixmapFilter::ConvolutionFilter:
        return new QGLPixmapConvolutionFilter;

    default:
        return 0;
        break;
    }
    return 0;
}

#if !defined(QT_OPENGL_ES_2)
extern void qt_add_rect_to_array(const QRectF &r, q_vertexType *array);
extern void qt_add_texcoords_to_array(qreal x1, qreal y1, qreal x2, qreal y2, q_vertexType *array);
#endif

static void qgl_drawTexture(const QRectF &rect, int tx_width, int tx_height, const QRectF & src)
{
#ifndef QT_OPENGL_ES_2  // XXX: needs to be ported
#ifndef QT_OPENGL_ES
    glPushAttrib(GL_CURRENT_BIT);
#endif
    qreal x1, x2, y1, y2;

    x1 = src.x() / tx_width;
    x2 = x1 + src.width() / tx_width;
    y1 = 1.0 - ((src.y() / tx_height) + (src.height() / tx_height));
    y2 = 1.0 - (src.y() / tx_height);

    q_vertexType vertexArray[4*2];
    q_vertexType texCoordArray[4*2];

    qt_add_rect_to_array(rect, vertexArray);
    qt_add_texcoords_to_array(x1, y2, x2, y1, texCoordArray);

    glVertexPointer(2, q_vertexTypeEnum, 0, vertexArray);
    glTexCoordPointer(2, q_vertexTypeEnum, 0, texCoordArray);

    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    glDisableClientState(GL_VERTEX_ARRAY);

#ifndef QT_OPENGL_ES
    glPopAttrib();
#endif
#endif
}

static const char *qt_gl_colorize_filter =
        "uniform sampler2D texture;"
        "uniform vec3 color;"
        "void main(void)"
        "{"
        "        vec2 coords = gl_TexCoord[0].st;"
        "        vec4 src = texture2D(texture, coords);"
        "        float gray = dot(src.rgb, vec3(0.212671, 0.715160, 0.072169));"
        "        vec3 colorizeed = 1.0-((1.0-gray)*(1.0-color));"
        "        gl_FragColor = vec4(colorizeed, src.a);"
        "}";

QGLPixmapColorizeFilter::QGLPixmapColorizeFilter()
    : m_program(QLatin1String(qt_gl_colorize_filter))
{
    m_program.setUniform(m_program.getUniformLocation(QLatin1String("texture")), 0); // GL_TEXTURE_0
    m_colorUniform = m_program.getUniformLocation(QLatin1String("color"));
}

bool QGLPixmapColorizeFilter::processGL(QPainter *, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const
{
    bindTexture(src);

    QColor col = color();
    m_program.setUniform(m_colorUniform, col.redF(), col.greenF(), col.blueF());

    QRectF target = (srcRect.isNull() ? QRectF(src.rect()) : srcRect).translated(pos);
    m_program.enable();
    qgl_drawTexture(target, src.width(), src.height(), srcRect);
    m_program.disable();

    return true;
}

// generates convolution filter code for arbitrary sized kernel
QString QGLPixmapConvolutionFilter::generateConvolutionShader() const {
    QByteArray code;
    code.append("uniform sampler2D texture;\n");
    code.append("uniform vec2 inv_texture_size;\n");
    code.append("uniform float matrix[");
    code.append(QByteArray::number(m_kernelWidth * m_kernelHeight));
    code.append("];\n");
    code.append("vec2 offset[");
    code.append(QByteArray::number(m_kernelWidth*m_kernelHeight));
    code.append("];\n");
    code.append("void main(void) {\n");

    for(int y = 0; y < m_kernelHeight; y++) {
        for(int x = 0; x < m_kernelWidth; x++) {
            code.append("  offset[");
            code.append(QByteArray::number(y * m_kernelWidth + x));
            code.append("] = vec2(inv_texture_size.x * ");
            code.append(QByteArray::number(x-(int)(m_kernelWidth/2)));
            code.append(".0, inv_texture_size.y * ");
            code.append(QByteArray::number((int)(m_kernelHeight/2)-y));
            code.append(".0)");
            code.append(";\n");
        }
    }

    code.append("  int i = 0;\n");
    code.append("  vec2 coords = gl_TexCoord[0].st;\n");
    code.append("  vec4 sum = vec4(0.0);\n");
    code.append("  for (i = 0; i < ");
    code.append(QByteArray::number(m_kernelWidth * m_kernelHeight));
    code.append("; i++) {\n");
    code.append("    vec4 tmp = texture2D(texture,coords+offset[i]);\n");
    code.append("    sum += matrix[i] * tmp;\n");
    code.append("  }\n");
    code.append("  gl_FragColor = sum;\n");
    code.append("}");
    return QLatin1String(code);
}

QGLPixmapConvolutionFilter::QGLPixmapConvolutionFilter()
    : m_program(0)
    , m_scaleUniform(0)
    , m_matrixUniform(0)
    , m_kernelWidth(0)
    , m_kernelHeight(0)
{
}

QGLPixmapConvolutionFilter::~QGLPixmapConvolutionFilter()
{
    delete m_program;
}

bool QGLPixmapConvolutionFilter::processGL(QPainter *, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const
{
    QRectF target = (srcRect.isNull() ? QRectF(src.rect()) : srcRect).translated(pos);

    bindTexture(src);
#ifdef GL_CLAMP
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
#endif
    if (!m_program || m_kernelWidth != columns() || m_kernelHeight != rows()) {
        delete m_program;

        m_kernelWidth = columns();
        m_kernelHeight = rows();

        QString code = generateConvolutionShader();
        m_program = new QGLSLProgram(code);
        m_scaleUniform = m_program->getUniformLocation(QLatin1String("inv_texture_size"));
        m_matrixUniform = m_program->getUniformLocation(QLatin1String("matrix"));
    }

    const qreal *kernel = convolutionKernel();
    GLfloat *conv = new GLfloat[m_kernelWidth * m_kernelHeight];
    for(int i = 0; i < m_kernelWidth * m_kernelHeight; ++i)
        conv[i] = kernel[i];

    const qreal iw = 1.0 / src.width();
    const qreal ih = 1.0 / src.height();
    m_program->setUniform(m_scaleUniform, iw, ih);
    m_program->setUniform(m_matrixUniform, m_kernelWidth * m_kernelHeight, conv);

    m_program->enable();
    qgl_drawTexture(target, src.width(), src.height(), boundingRectFor(srcRect));
    m_program->disable();
    return true;
}

QT_END_NAMESPACE