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
|
/* SpriteShader.cpp
Copyright (c) 2014 by Michael Zahniser
Endless Sky is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later version.
Endless Sky is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "SpriteShader.h"
#include "../GameData.h"
#include "../Screen.h"
#include "Shader.h"
#include "../image/Sprite.h"
#include "../Swizzle.h"
#ifdef ES_GLES
// ES_GLES always uses the shader, not this, so use a dummy value to compile.
// (the correct value is usually 0x8E46, so don't use that)
#define GL_TEXTURE_SWIZZLE_RGBA 0xBEEF
#endif
using namespace std;
namespace {
const Shader *shader;
GLint scaleI;
GLint texI;
GLint swizzleMaskI;
GLint useSwizzleMaskI;
GLint frameI;
GLint frameCountI;
GLint positionI;
GLint transformI;
GLint blurI;
GLint clipI;
GLint alphaI;
GLint swizzleMatrixI;
GLint useSwizzleI;
GLuint vao;
GLuint vbo;
}
// Initialize the shaders.
void SpriteShader::Init()
{
shader = GameData::Shaders().Get("sprite");
if(!shader->Object())
throw std::runtime_error("Could not find sprite shader!");
scaleI = shader->Uniform("scale");
texI = shader->Uniform("tex");
frameI = shader->Uniform("frame");
frameCountI = shader->Uniform("frameCount");
positionI = shader->Uniform("position");
transformI = shader->Uniform("transform");
blurI = shader->Uniform("blur");
clipI = shader->Uniform("clip");
alphaI = shader->Uniform("alpha");
swizzleMatrixI = shader->Uniform("swizzleMatrix");
swizzleMaskI = shader->Uniform("swizzleMask");
useSwizzleMaskI = shader->Uniform("useSwizzleMask");
useSwizzleI = shader->Uniform("useSwizzle");
// Generate the vertex data for drawing sprites.
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
GLfloat vertexData[] = {
-.5f, -.5f,
-.5f, .5f,
.5f, -.5f,
.5f, .5f
};
glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData), vertexData, GL_STATIC_DRAW);
glEnableVertexAttribArray(shader->Attrib("vert"));
glVertexAttribPointer(shader->Attrib("vert"), 2, GL_FLOAT, GL_FALSE, 2 * sizeof(GLfloat), nullptr);
// unbind the VBO and VAO
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
void SpriteShader::Draw(const Sprite *sprite, const Point &position,
float zoom, const Swizzle *swizzle, float frame, const Point &unit)
{
if(!sprite)
return;
Bind();
Add(Prepare(sprite, position, zoom, swizzle, frame, unit));
Unbind();
}
SpriteShader::Item SpriteShader::Prepare(const Sprite *sprite, const Point &position,
float zoom, const Swizzle *swizzle, float frame, const Point &unit)
{
if(!sprite)
return {};
Item item;
item.texture = sprite->Texture();
item.swizzleMask = sprite->SwizzleMask();
item.frame = frame;
item.frameCount = sprite->Frames();
// Position.
item.position[0] = static_cast<float>(position.X());
item.position[1] = static_cast<float>(position.Y());
// Rotation and scale.
Point scaledUnit = unit * zoom;
Point uw = scaledUnit * sprite->Width();
Point uh = scaledUnit * sprite->Height();
item.transform[0] = static_cast<float>(-uw.Y());
item.transform[1] = static_cast<float>(uw.X());
item.transform[2] = static_cast<float>(-uh.X());
item.transform[3] = static_cast<float>(-uh.Y());
// Swizzle.
item.swizzle = swizzle;
return item;
}
void SpriteShader::Bind()
{
glUseProgram(shader->Object());
glBindVertexArray(vao);
GLfloat scale[2] = {2.f / Screen::Width(), -2.f / Screen::Height()};
glUniform2fv(scaleI, 1, scale);
}
void SpriteShader::Add(const Item &item, bool withBlur)
{
if(item.swizzle)
{
glUniform1i(swizzleMaskI, 1);
// Don't mask full color swizzles that always apply to the whole ship sprite.
glUniform1i(useSwizzleMaskI, item.swizzle->OverrideMask() ? 0 : item.swizzleMask);
// Set the color swizzle.
glUniformMatrix4fv(swizzleMatrixI, 1, GL_FALSE, item.swizzle->MatrixPtr());
glUniform1i(useSwizzleI, !item.swizzle->IsIdentity());
}
else
glUniform1i(useSwizzleI, 0);
glUniform1i(texI, 0);
glBindTexture(GL_TEXTURE_2D_ARRAY, item.texture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D_ARRAY, item.swizzleMask);
glActiveTexture(GL_TEXTURE0);
glUniform1f(frameI, item.frame);
glUniform1f(frameCountI, item.frameCount);
glUniform2fv(positionI, 1, item.position);
glUniformMatrix2fv(transformI, 1, false, item.transform);
// Special case: check if the blur should be applied or not.
static const float UNBLURRED[2] = {0.f, 0.f};
glUniform2fv(blurI, 1, withBlur ? item.blur : UNBLURRED);
glUniform1f(clipI, item.clip);
glUniform1f(alphaI, item.alpha);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
void SpriteShader::Unbind()
{
// Reset the swizzle.
glUniform1i(useSwizzleI, 0);
glBindVertexArray(0);
glUseProgram(0);
}
|
