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
|
#include "YVURenderer.h"
#include <GLES2/gl2ext.h>
#include <android/log.h>
#define LOG_TAG "YVURenderer"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
const GLfloat g_vVertices[] = {
-1.f, 1.f, 0.0f, 1.0f, // Position 0
0.0f, 1.0f, // TexCoord 0
1.f, 1.f, 0.0f, 1.0f, // Position 1
1.0f, 1.0f, // TexCoord 1
-1.f, -1.f, 0.0f, 1.0f, // Position 2
0.0f, 0.0f, // TexCoord 2
1.f, -1.f, 0.0f, 1.0f, // Position 3
1.0f, 0.0f // TexCoord 3
};
const int VERTEX_STRIDE = 6 * sizeof(GLfloat);
GLushort g_iIndices3[] = { 0, 1, 2, 3 };
YVURenderer::YVURenderer() : Renderer()
{
}
YVURenderer::~YVURenderer() {
}
bool YVURenderer::InitializeGLProgram()
{
bool succeeded = false;
do {
GLuint glProgram;
glProgram = createProgram(VertexShaderSource(),
FragmentShaderSource());
if (!glProgram) {
break;
}
glUseProgram(glProgram);
if (!checkGlError("glUseProgram")) break;
// Get attribute locations
mPositionLoc = glGetAttribLocation(glProgram, "a_Position");
mTexCoordLoc = glGetAttribLocation(glProgram, "a_texCoord");
// Get sampler location
mSamplerLoc = glGetUniformLocation(glProgram, "s_texture");
mGlProgram = glProgram;
succeeded = true;
} while (false);
if (!succeeded && (mGlProgram != 0))
{
glDeleteProgram(mGlProgram);
checkGlError("glDeleteProgram");
mGlProgram = 0;
}
return succeeded;
}
bool YVURenderer::DrawTexture()
{
bool succeeded = false;
do {
bool rt = (mFrameBuffer == NULL)?
SetupGraphics(mSurfaceWidth, mSurfaceHeight) :
SetupGraphics(mFrameBuffer);
if(!rt)
break;
glDisable(GL_BLEND);
glActiveTexture(GL_TEXTURE0);
if (!checkGlError("glActiveTexture")) break;
const GLenum texture_type = InputTextureType();
glBindTexture(texture_type, mInputTextureName);
if (!checkGlError("glBindTexture")) break;
// Set the sampler texture unit to 0
glUniform1i(mSamplerLoc, 0);
// Load the vertex position
glVertexAttribPointer(mPositionLoc, 4, GL_FLOAT,
GL_FALSE, VERTEX_STRIDE, g_vVertices);
// Load the texture coordinate
glVertexAttribPointer(mTexCoordLoc, 2, GL_FLOAT,
GL_FALSE, VERTEX_STRIDE, &g_vVertices[4]);
glEnableVertexAttribArray(mPositionLoc);
glEnableVertexAttribArray(mTexCoordLoc);
// And, finally, execute the GL draw command.
glDrawElements(GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_SHORT, g_iIndices3);
checkGlError("glDrawElements");
glBindFramebuffer(GL_FRAMEBUFFER, 0);
succeeded = true;
} while (false);
return succeeded;
}
const char* YVURenderer::VertexShaderSource() const
{
// All this really does is copy the coordinates into
// variables for the fragment shader to pick up.
static const char gVertexShader[] =
"attribute vec4 a_Position;\n"
"attribute vec2 a_texCoord;\n"
"varying vec2 v_texCoord;\n"
"void main() {\n"
" gl_Position = a_Position;\n"
" v_texCoord = a_texCoord;\n"
"}\n";
return gVertexShader;
}
const char* YVURenderer::FragmentShaderSource() const
{
static const char gFragmentShader[] =
"precision mediump float;\n"
"uniform sampler2D s_texture;\n"
"const vec4 coeff_y = vec4(0.257, 0.594, 0.098, 0.063);\n"
"const vec4 coeff_v = vec4(0.439, -0.368, -0.071, 0.500);\n"
"const vec4 coeff_u = vec4(-0.148, -0.291, 0.439, 0.500);\n"
"varying vec2 v_texCoord;\n"
"void main() {\n"
" vec4 p;\n"
" p = texture2D(s_texture, v_texCoord);\n"
" gl_FragColor[0] = dot(p, coeff_y);\n"
" p = texture2D(s_texture, v_texCoord);\n"
" gl_FragColor[1] = dot(p, coeff_v);\n"
" p = texture2D(s_texture, v_texCoord);\n"
" gl_FragColor[2] = dot(p, coeff_u);\n"
" p = texture2D(s_texture, v_texCoord);\n"
" gl_FragColor[3] = dot(p, coeff_y);\n"
"}\n";
return gFragmentShader;
}
|
