-
Notifications
You must be signed in to change notification settings - Fork 5
/
demo-cartoon.c
205 lines (176 loc) · 7.05 KB
/
demo-cartoon.c
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
/* =========================================================================
* Freetype GL - A C OpenGL Freetype engine
* Platform: Any
* WWW: http://code.google.com/p/freetype-gl/
* -------------------------------------------------------------------------
* Copyright 2011,2012 Nicolas P. Rougier. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY NICOLAS P. ROUGIER ''AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL NICOLAS P. ROUGIER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are
* those of the authors and should not be interpreted as representing official
* policies, either expressed or implied, of Nicolas P. Rougier.
* ========================================================================= */
#include <stdio.h>
#include <wchar.h>
#include "freetype-gl.h"
#include "vertex-buffer.h"
#include "markup.h"
#include "shader.h"
#include "mat4.h"
#if defined(__APPLE__)
#include <Glut/glut.h>
#elif defined(_WIN32) || defined(_WIN64)
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif
// ------------------------------------------------------- typedef & struct ---
typedef struct {
float x, y, z;
float u, v;
vec4 color;
} vertex_t;
// ------------------------------------------------------- global variables ---
texture_atlas_t * atlas;
vertex_buffer_t * buffer;
GLuint shader;
mat4 model, view, projection;
// ---------------------------------------------------------------- display ---
void display( void )
{
glClearColor( 0.40, 0.40, 0.45, 1.00 );
glClearColor( 1.0, 1.0, 1.0, 1.0 );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
glUseProgram( shader );
{
glUniform1i( glGetUniformLocation( shader, "texture" ),
0 );
glUniformMatrix4fv( glGetUniformLocation( shader, "model" ),
1, 0, model.data);
glUniformMatrix4fv( glGetUniformLocation( shader, "view" ),
1, 0, view.data);
glUniformMatrix4fv( glGetUniformLocation( shader, "projection" ),
1, 0, projection.data);
vertex_buffer_render( buffer, GL_TRIANGLES );
}
glutSwapBuffers( );
}
// ---------------------------------------------------------------- reshape ---
void reshape(int width, int height)
{
glViewport(0, 0, width, height);
mat4_set_orthographic( &projection, 0, width, 0, height, -1, 1);
}
// --------------------------------------------------------------- keyboard ---
void keyboard( unsigned char key, int x, int y )
{
if ( key == 27 )
{
exit( EXIT_SUCCESS );
}
}
// --------------------------------------------------------------- add_text ---
void add_text( vertex_buffer_t * buffer, texture_font_t * font,
wchar_t *text, vec2 pen, vec4 fg_color_1, vec4 fg_color_2 )
{
size_t i;
for( i=0; i<wcslen(text); ++i )
{
texture_glyph_t *glyph = texture_font_get_glyph( font, text[i] );
float kerning = 0;
if( i > 0)
{
kerning = texture_glyph_get_kerning( glyph, text[i-1] );
}
pen.x += kerning;
/* Actual glyph */
float x0 = ( pen.x + glyph->offset_x );
float y0 = (int)( pen.y + glyph->offset_y );
float x1 = ( x0 + glyph->width );
float y1 = (int)( y0 - glyph->height );
float s0 = glyph->s0;
float t0 = glyph->t0;
float s1 = glyph->s1;
float t1 = glyph->t1;
GLuint index = buffer->vertices->size;
GLuint indices[] = {index, index+1, index+2,
index, index+2, index+3};
vertex_t vertices[] = {
{ (int)x0,y0,0, s0,t0, fg_color_1 },
{ (int)x0,y1,0, s0,t1, fg_color_2 },
{ (int)x1,y1,0, s1,t1, fg_color_2 },
{ (int)x1,y0,0, s1,t0, fg_color_1 } };
vertex_buffer_push_back_indices( buffer, indices, 6 );
vertex_buffer_push_back_vertices( buffer, vertices, 4 );
pen.x += glyph->advance_x;
}
}
// ------------------------------------------------------------------- main ---
int main( int argc, char **argv )
{
size_t width = 800, height = 200;
glutInit( &argc, argv );
glutInitWindowSize( width, height );
glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH );
glutCreateWindow( "Glyph Cartoon" );
glutReshapeFunc( reshape );
glutDisplayFunc( display );
glutKeyboardFunc( keyboard );
GLenum err = glewInit();
if (GLEW_OK != err)
{
/* Problem: glewInit failed, something is seriously wrong. */
fprintf( stderr, "Error: %s\n", glewGetErrorString(err) );
exit( EXIT_FAILURE );
}
fprintf( stderr, "Using GLEW %s\n", glewGetString(GLEW_VERSION) );
atlas = texture_atlas_new( 1024, 1024, 1 );
buffer = vertex_buffer_new( "vertex:3f,tex_coord:2f,color:4f" );
texture_font_t *font = texture_font_new( atlas, "fonts/ObelixPro.ttf", 128 );
vec2 pen = {{50, 50}};
vec4 black = {{0.0, 0.0, 0.0, 1.0}};
vec4 yellow = {{1.0, 1.0, 0.0, 1.0}};
vec4 orange1 = {{1.0, 0.9, 0.0, 1.0}};
vec4 orange2 = {{1.0, 0.6, 0.0, 1.0}};
font->outline_type = 2;
font->outline_thickness = 7;
add_text( buffer, font, L"Freetype GL", pen, black, black );
font->outline_type = 2;
font->outline_thickness = 5;
add_text( buffer, font, L"Freetype GL", pen, yellow, yellow );
font->outline_type = 1;
font->outline_thickness = 3;
add_text( buffer, font, L"Freetype GL", pen, black, black );
font->outline_type = 0;
font->outline_thickness = 0;
add_text( buffer, font, L"Freetype GL", pen, orange1, orange2 );
shader = shader_load("shaders/v3f-t2f-c4f.vert",
"shaders/v3f-t2f-c4f.frag");
mat4_set_identity( &projection );
mat4_set_identity( &model );
mat4_set_identity( &view );
glutMainLoop( );
return 0;
}