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
206
207
208
209
210
211
212
|
#include <emscripten/html5_webgl.h>
#include <emscripten/html5.h>
#include <webgl/webgl2.h>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
GLuint compile_shader(GLenum shaderType, const char *src) {
GLuint shader = glCreateShader(shaderType);
glShaderSource(shader, 1, &src, NULL);
glCompileShader(shader);
return shader;
}
GLuint create_program(GLuint vertexShader, GLuint fragmentShader) {
GLuint program = glCreateProgram();
glAttachShader(program, vertexShader);
glAttachShader(program, fragmentShader);
glBindAttribLocation(program, 0, "apos");
glBindAttribLocation(program, 1, "acolor");
glLinkProgram(program);
return program;
}
int main() {
EmscriptenWebGLContextAttributes attrs;
emscripten_webgl_init_context_attributes(&attrs);
attrs.majorVersion = 2;
attrs.proxyContextToMainThread = EMSCRIPTEN_WEBGL_CONTEXT_PROXY_FALLBACK;
attrs.renderViaOffscreenBackBuffer = true;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context("#canvas", &attrs);
emscripten_webgl_make_context_current(context);
// Test emscripten_webgl_get_supported_extensions() API
char *extensions = emscripten_webgl_get_supported_extensions();
assert(extensions);
assert(strlen(extensions) > 0);
assert(strstr(extensions, "WEBGL") != 0);
free(extensions);
// Test emscripten_webgl_get_parameter_d() API
assert(emscripten_webgl_get_parameter_d(GL_BLUE_BITS) == 8);
// Test emscripten_webgl_get_parameter_o() API
GLuint buf;
glGenBuffers(1, &buf);
assert(buf != 0);
glBindBuffer(GL_ARRAY_BUFFER, buf);
assert(emscripten_webgl_get_parameter_o(GL_ARRAY_BUFFER_BINDING) == buf);
// Test emscripten_webgl_get_parameter_utf8() API
char *version = emscripten_webgl_get_parameter_utf8(GL_VERSION);
assert(version);
assert(strstr(version, "WebGL") != 0);
free(version);
// Test emscripten_webgl_get_parameter_i64v API
int64_t components = 0;
emscripten_webgl_get_parameter_i64v(GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS, &components);
assert(components > 0);
// Test emscripten_webgl_get_parameter_v API with truncated read length
glViewport(1, 2, 3, 4);
int viewport[4] = { 0, 0, 0, 0 };
int numElements = emscripten_webgl_get_parameter_v(GL_VIEWPORT, viewport, 3, EMSCRIPTEN_WEBGL_PARAM_TYPE_INT);
assert(numElements == 4);
assert(viewport[0] == 1);
assert(viewport[1] == 2);
assert(viewport[2] == 3);
assert(viewport[3] == 0);
// Test emscripten_webgl_get_parameter_v API with full read length
numElements = emscripten_webgl_get_parameter_v(GL_VIEWPORT, viewport, 4, EMSCRIPTEN_WEBGL_PARAM_TYPE_INT);
assert(numElements == 4);
assert(viewport[0] == 1);
assert(viewport[1] == 2);
assert(viewport[2] == 3);
assert(viewport[3] == 4);
// Test emscripten_webgl_get_vertex_attrib_d() API
glEnableVertexAttribArray(0);
double enabled = emscripten_webgl_get_vertex_attrib_d(0, GL_VERTEX_ATTRIB_ARRAY_ENABLED);
assert(enabled == 1.0);
// Test emscripten_webgl_get_vertex_attrib_v() API with truncated read length
glVertexAttrib4f(0, 0.2f, 0.4f, 0.6f, 0.8f);
float data[4] = { 0, 0, 0, 0 };
numElements = emscripten_webgl_get_vertex_attrib_v(0, GL_CURRENT_VERTEX_ATTRIB, data, 2, EMSCRIPTEN_WEBGL_PARAM_TYPE_FLOAT);
assert(numElements == 4);
assert(data[0] == 0.2f);
assert(data[1] == 0.4f);
assert(data[2] == 0.0f);
assert(data[3] == 0.0f);
// Test emscripten_webgl_get_vertex_attrib_v() API with full read length
numElements = emscripten_webgl_get_vertex_attrib_v(0, GL_CURRENT_VERTEX_ATTRIB, data, 4, EMSCRIPTEN_WEBGL_PARAM_TYPE_FLOAT);
assert(numElements == 4);
assert(data[0] == 0.2f);
assert(data[1] == 0.4f);
assert(data[2] == 0.6f);
assert(data[3] == 0.8f);
// Test emscripten_webgl_get_vertex_attrib_o() API
glBufferData(GL_ARRAY_BUFFER, 4, data, GL_STATIC_DRAW);
glVertexAttribPointer(0, 1, GL_FLOAT, GL_FALSE, 0, 0);
assert(emscripten_webgl_get_vertex_attrib_o(0, GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING) == buf);
static const char vertex_shader[] =
"#version 100\n"
"attribute vec4 apos;"
"attribute vec4 acolor;"
"uniform float vsUniformFloat;"
"varying vec4 color;"
"void main() {"
"color = acolor * vsUniformFloat;"
"gl_Position = apos;"
"}";
GLuint vs = compile_shader(GL_VERTEX_SHADER, vertex_shader);
// Test emscripten_webgl_get_shader_parameter_d() API
assert(emscripten_webgl_get_shader_parameter_d(vs, GL_DELETE_STATUS) == 0);
assert(emscripten_webgl_get_shader_parameter_d(vs, GL_COMPILE_STATUS) == 1);
assert(emscripten_webgl_get_shader_parameter_d(vs, GL_SHADER_TYPE) == GL_VERTEX_SHADER);
// Test emscripten_webgl_get_shader_source_utf8() API
char *src = emscripten_webgl_get_shader_source_utf8(vs);
assert(src);
assert(strstr(src, "attribute") != 0);
free(src);
static const char failing_shader[] =
"#version 100\n"
"attribute vec4 apos;"
"attr_error_ibute vec4 acolor;"
"varying vec4 color;"
"void main() {"
"color = acolor;"
"gl_Position = apos;"
"}";
GLuint vs2 = compile_shader(GL_VERTEX_SHADER, failing_shader);
// Test emscripten_webgl_get_shader_info_log_utf8() API
src = emscripten_webgl_get_shader_info_log_utf8(vs2);
assert(src);
assert(strstr(src, "attr_error_ibute") != 0);
free(src);
static const char fragment_shader[] =
"#version 100\n"
"precision lowp float;"
"varying vec4 color;"
"uniform vec4 psUniformVec;"
"void main() {"
"gl_FragColor = color + psUniformVec;"
"}";
GLuint fs = compile_shader(GL_FRAGMENT_SHADER, fragment_shader);
// Test emscripten_webgl_get_shader_parameter_d() API
assert(emscripten_webgl_get_shader_parameter_d(fs, GL_DELETE_STATUS) == 0);
assert(emscripten_webgl_get_shader_parameter_d(fs, GL_COMPILE_STATUS) == 1);
assert(emscripten_webgl_get_shader_parameter_d(fs, GL_SHADER_TYPE) == GL_FRAGMENT_SHADER);
// Test emscripten_webgl_get_shader_source_utf8() API
src = emscripten_webgl_get_shader_source_utf8(fs);
assert(src);
assert(strstr(src, "varying") != 0);
free(src);
GLuint program = create_program(vs, fs);
// Test emscripten_webgl_get_program_parameter_d() API
assert(emscripten_webgl_get_program_parameter_d(program, GL_ACTIVE_ATTRIBUTES) == 2);
// Test emscripten_webgl_get_program_info_log_utf8() API
GLuint program2 = create_program(vs2, fs);
char *programLog = emscripten_webgl_get_program_info_log_utf8(program2);
assert(programLog);
// Firefox says "Must have a compiled vertex shader attached."
// Chrome says "invalid shaders"
// -> test that word "shader" is present
assert(strstr(programLog, "shader") != 0);
free(programLog);
glUseProgram(program);
glUniform1f(glGetUniformLocation(program, "vsUniformFloat"), 2.f);
glUniform4f(glGetUniformLocation(program, "psUniformVec"), 1.f, 2.f, 3.f, 4.f);
// Test emscripten_webgl_get_uniform_d() API
double vsUniformFloat = emscripten_webgl_get_uniform_d(program, glGetUniformLocation(program, "vsUniformFloat"));
assert(vsUniformFloat == 2.f);
float psUniformVec[4] = { 0, 0, 0, 0 };
// Test emscripten_webgl_get_uniform_v() API truncated read
numElements = emscripten_webgl_get_uniform_v(program, glGetUniformLocation(program, "psUniformVec"), psUniformVec, 3, EMSCRIPTEN_WEBGL_PARAM_TYPE_FLOAT);
assert(numElements == 4);
assert(psUniformVec[0] == 1.0f);
assert(psUniformVec[1] == 2.0f);
assert(psUniformVec[2] == 3.0f);
assert(psUniformVec[3] == 0.0f);
// Test emscripten_webgl_get_uniform_v() API full read
numElements = emscripten_webgl_get_uniform_v(program, glGetUniformLocation(program, "psUniformVec"), psUniformVec, 4, EMSCRIPTEN_WEBGL_PARAM_TYPE_FLOAT);
assert(numElements == 4);
assert(psUniformVec[0] == 1.0f);
assert(psUniformVec[1] == 2.0f);
assert(psUniformVec[2] == 3.0f);
assert(psUniformVec[3] == 4.0f);
return 0;
}
|
