1 //
2 // Copyright 2018 The ANGLE Project Authors. All rights reserved.
3 // Use of this source code is governed by a BSD-style license that can be
4 // found in the LICENSE file.
5 //
6
7 // Based on Simple_Texture2D.c from
8 // Book: OpenGL(R) ES 2.0 Programming Guide
9 // Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner
10 // ISBN-10: 0321502795
11 // ISBN-13: 9780321502797
12 // Publisher: Addison-Wesley Professional
13 // URLs: http://safari.informit.com/9780321563835
14 // http://www.opengles-book.com
15
16 #include "SampleApplication.h"
17 #include "texture_utils.h"
18 #include "util/shader_utils.h"
19 #include "util/test_utils.h"
20
21 #include <GLES/gl.h>
22 #include <GLES/glext.h>
23
24 class GLES1DrawTextureSample : public SampleApplication
25 {
26 public:
GLES1DrawTextureSample(int argc,char ** argv)27 GLES1DrawTextureSample(int argc, char **argv)
28 : SampleApplication("GLES1DrawTexture", argc, argv, ClientType::ES1, 1280, 800)
29 {}
30
initialize()31 bool initialize() override
32 {
33 // Load the texture
34 mTexture = CreateSimpleTexture2D();
35
36 glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
37 glActiveTexture(GL_TEXTURE0);
38 glEnable(GL_TEXTURE_2D);
39
40 glActiveTexture(GL_TEXTURE0);
41 glEnable(GL_TEXTURE_2D);
42 glBindTexture(GL_TEXTURE_2D, mTexture);
43
44 GLint crop[4] = {0, 0, 2, 2};
45 glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES, crop);
46 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
47
48 glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight());
49
50 return true;
51 }
52
destroy()53 void destroy() override { glDeleteTextures(1, &mTexture); }
54
draw()55 void draw() override
56 {
57 glClear(GL_COLOR_BUFFER_BIT);
58
59 GLint windowWidth = getWindow()->getWidth();
60 GLint windowHeight = getWindow()->getHeight();
61
62 glDrawTexiOES(mX, mY, 0, mWidth, mHeight);
63 glDrawTexiOES(windowWidth - mX, mY, 0, mWidth, mHeight);
64 glDrawTexiOES(mX, windowHeight - mY, 0, mWidth, mHeight);
65 glDrawTexiOES(windowWidth - mX, windowHeight - mY, 0, mWidth, mHeight);
66
67 mX += mReverseX ? -1 : 1;
68 mY += mReverseY ? -1 : 1;
69
70 if (mX + mWidth >= windowWidth)
71 mReverseX = true;
72 if (mX < 0)
73 mReverseX = false;
74
75 if (mY + mHeight >= windowHeight)
76 mReverseY = true;
77 if (mY < 0)
78 mReverseY = false;
79
80 ++mWidth;
81 ++mHeight;
82 if (mWidth >= windowWidth)
83 mWidth = 0;
84 if (mHeight >= windowHeight)
85 mHeight = 0;
86
87 angle::Sleep(16);
88 }
89
90 private:
91 // Texture handle
92 GLuint mTexture = 0;
93
94 // Draw texture coordinates and dimensions to loop through
95 GLint mX = 0;
96 GLint mY = 0;
97 GLint mWidth = 0;
98 GLint mHeight = 0;
99
100 bool mReverseX = false;
101 bool mReverseY = false;
102 };
103
main(int argc,char ** argv)104 int main(int argc, char **argv)
105 {
106 GLES1DrawTextureSample app(argc, argv);
107 return app.run();
108 }
109