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
|
#include <mbgl/renderer/prerendered_texture.hpp>
#include <mbgl/renderer/painter.hpp>
using namespace mbgl;
PrerenderedTexture::PrerenderedTexture(const RasterizedProperties &properties)
: properties(properties) {
}
PrerenderedTexture::~PrerenderedTexture() {
if (texture != 0) {
glDeleteTextures(1, &texture);
texture = 0;
}
if (fbo != 0) {
glDeleteFramebuffers(1, &fbo);
fbo = 0;
}
}
void PrerenderedTexture::bindTexture() {
if (texture == 0) {
bindFramebuffer();
unbindFramebuffer();
}
glBindTexture(GL_TEXTURE_2D, texture);
}
void PrerenderedTexture::bindFramebuffer() {
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &previous_fbo);
if (texture == 0) {
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, properties.size, properties.size, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glBindTexture(GL_TEXTURE_2D, 0);
}
if (fbo == 0) {
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE) {
fprintf(stderr, "Couldn't create framebuffer: ");
switch (status) {
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT: fprintf(stderr, "incomplete attachment\n"); break;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: fprintf(stderr, "incomplete missing attachment\n"); break;
#ifdef GL_ES_VERSION_2_0
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS: fprintf(stderr, "incomplete dimensions\n"); break;
#else
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER: fprintf(stderr, "incomplete draw buffer\n"); break;
#endif
case GL_FRAMEBUFFER_UNSUPPORTED: fprintf(stderr, "unsupported\n"); break;
default: fprintf(stderr, "other\n"); break;
}
return;
}
} else {
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
}
}
void PrerenderedTexture::unbindFramebuffer() {
glBindFramebuffer(GL_FRAMEBUFFER, previous_fbo);
if (fbo != 0) {
glDeleteFramebuffers(1, &fbo);
fbo = 0;
}
}
void PrerenderedTexture::blur(Painter& painter, uint16_t passes) {
const GLuint original_texture = texture;
// Create a secondary texture
GLuint secondary_texture;
glGenTextures(1, &secondary_texture);
glBindTexture(GL_TEXTURE_2D, secondary_texture);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, properties.size, properties.size, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glBindTexture(GL_TEXTURE_2D, 0);
painter.useProgram(painter.gaussianShader->program);
painter.gaussianShader->setMatrix(painter.flipMatrix);
painter.gaussianShader->setImage(0);
glActiveTexture(GL_TEXTURE0);
for (int i = 0; i < passes; i++) {
// Render horizontal
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, secondary_texture, 0);
#if GL_EXT_discard_framebuffer
const GLenum discards[] = { GL_COLOR_ATTACHMENT0 };
glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, discards);
#endif
glClear(GL_COLOR_BUFFER_BIT);
painter.gaussianShader->setOffset({{ 1.0f / float(properties.size), 0 }});
glBindTexture(GL_TEXTURE_2D, original_texture);
painter.coveringGaussianArray.bind(*painter.gaussianShader, painter.tileStencilBuffer, BUFFER_OFFSET(0));
glDrawArrays(GL_TRIANGLES, 0, (GLsizei)painter.tileStencilBuffer.index());
// Render vertical
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, original_texture, 0);
#if GL_EXT_discard_framebuffer
glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, discards);
#endif
glClear(GL_COLOR_BUFFER_BIT);
painter.gaussianShader->setOffset({{ 0, 1.0f / float(properties.size) }});
glBindTexture(GL_TEXTURE_2D, secondary_texture);
painter.coveringGaussianArray.bind(*painter.gaussianShader, painter.tileStencilBuffer, BUFFER_OFFSET(0));
glDrawArrays(GL_TRIANGLES, 0, (GLsizei)painter.tileStencilBuffer.index());
}
glDeleteTextures(1, &secondary_texture);
}
|
