jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2022, Stephan Unverwerth <s.unverwerth@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <AK/StringBuilder.h>
8#include <LibGL/GLContext.h>
9
10namespace GL {
11
12GLuint GLContext::gl_create_shader(GLenum shader_type)
13{
14 // FIXME: Add support for GL_COMPUTE_SHADER, GL_TESS_CONTROL_SHADER, GL_TESS_EVALUATION_SHADER and GL_GEOMETRY_SHADER.
15 RETURN_VALUE_WITH_ERROR_IF(shader_type != GL_VERTEX_SHADER
16 && shader_type != GL_FRAGMENT_SHADER,
17 GL_INVALID_ENUM,
18 0);
19
20 GLuint shader_name;
21 m_shader_name_allocator.allocate(1, &shader_name);
22 auto shader = Shader::create(shader_type);
23 m_allocated_shaders.set(shader_name, shader);
24 return shader_name;
25}
26
27void GLContext::gl_delete_shader(GLuint shader)
28{
29 // "A value of 0 for shader will be silently ignored." (https://registry.khronos.org/OpenGL-Refpages/gl4/html/glDeleteShader.xhtml)
30 if (shader == 0)
31 return;
32
33 auto it = m_allocated_shaders.find(shader);
34 RETURN_WITH_ERROR_IF(it == m_allocated_shaders.end(), GL_INVALID_VALUE);
35
36 // FIXME: According to the spec, we should only flag the shader for deletion here and delete it once it is detached from all programs.
37 m_allocated_shaders.remove(it);
38 m_shader_name_allocator.free(shader);
39}
40
41void GLContext::gl_shader_source(GLuint shader, GLsizei count, GLchar const** string, GLint const* length)
42{
43 auto it = m_allocated_shaders.find(shader);
44 // FIXME: implement check "GL_INVALID_VALUE is generated if shader is not a value generated by OpenGL."
45 RETURN_WITH_ERROR_IF(it == m_allocated_shaders.end(), GL_INVALID_OPERATION);
46 RETURN_WITH_ERROR_IF(count < 0, GL_INVALID_VALUE);
47
48 it->value->clear_sources();
49 for (int i = 0; i < count; i++) {
50 if (length == nullptr || length[i] < 0) {
51 auto result = it->value->add_source(StringView(string[i], strlen(string[i])));
52 RETURN_WITH_ERROR_IF(result.is_error() && result.error().is_errno() && result.error().code() == ENOMEM, GL_OUT_OF_MEMORY);
53 RETURN_WITH_ERROR_IF(result.is_error(), GL_INVALID_OPERATION);
54 } else {
55 auto result = it->value->add_source(StringView(string[i], length[i]));
56 RETURN_WITH_ERROR_IF(result.is_error() && result.error().is_errno() && result.error().code() == ENOMEM, GL_OUT_OF_MEMORY);
57 RETURN_WITH_ERROR_IF(result.is_error(), GL_INVALID_OPERATION);
58 }
59 }
60}
61
62void GLContext::gl_compile_shader(GLuint shader)
63{
64 auto it = m_allocated_shaders.find(shader);
65 // FIXME: implement check "GL_INVALID_VALUE is generated if shader is not a value generated by OpenGL."
66 RETURN_WITH_ERROR_IF(it == m_allocated_shaders.end(), GL_INVALID_OPERATION);
67
68 // NOTE: We are ignoring the compilation result here since it is tracked inside the shader object
69 (void)it->value->compile();
70}
71
72void GLContext::gl_get_shader(GLuint shader, GLenum pname, GLint* params)
73{
74 RETURN_WITH_ERROR_IF(pname != GL_SHADER_TYPE
75 && pname != GL_DELETE_STATUS
76 && pname != GL_COMPILE_STATUS
77 && pname != GL_INFO_LOG_LENGTH
78 && pname != GL_SHADER_SOURCE_LENGTH,
79 GL_INVALID_ENUM);
80
81 // FIXME: implement check "GL_INVALID_VALUE is generated if shader is not a value generated by OpenGL."
82 // FIXME: implement check "GL_INVALID_OPERATION is generated if pname is GL_COMPILE_STATUS, GL_INFO_LOG_LENGTH, or GL_SHADER_SOURCE_LENGTH but a shader compiler is not supported."
83
84 auto it = m_allocated_shaders.find(shader);
85 RETURN_WITH_ERROR_IF(it == m_allocated_shaders.end(), GL_INVALID_OPERATION);
86
87 switch (pname) {
88 case GL_SHADER_TYPE:
89 *params = it->value->type();
90 break;
91
92 case GL_DELETE_STATUS:
93 // FIXME: Return the actual delete status once we implement this missing feature
94 *params = GL_FALSE;
95 break;
96
97 case GL_COMPILE_STATUS:
98 *params = it->value->compile_status() ? GL_TRUE : GL_FALSE;
99 break;
100
101 case GL_INFO_LOG_LENGTH:
102 *params = it->value->info_log_length();
103 break;
104
105 case GL_SHADER_SOURCE_LENGTH:
106 *params = it->value->combined_source_length();
107 break;
108
109 default:
110 VERIFY_NOT_REACHED();
111 }
112}
113
114GLuint GLContext::gl_create_program()
115{
116 GLuint program_name;
117 m_program_name_allocator.allocate(1, &program_name);
118 auto program = Program::create();
119 m_allocated_programs.set(program_name, program);
120 return program_name;
121}
122
123void GLContext::gl_delete_program(GLuint program)
124{
125 // "A value of 0 for program will be silently ignored." (https://registry.khronos.org/OpenGL-Refpages/gl4/html/glDeleteProgram.xhtml)
126 if (program == 0)
127 return;
128
129 auto it = m_allocated_programs.find(program);
130 RETURN_WITH_ERROR_IF(it == m_allocated_programs.end(), GL_INVALID_VALUE);
131
132 // FIXME: According to the spec, we should only flag the program for deletion here and delete it once it is not used anymore.
133 m_allocated_programs.remove(it);
134 m_program_name_allocator.free(program);
135}
136
137void GLContext::gl_attach_shader(GLuint program, GLuint shader)
138{
139 auto program_it = m_allocated_programs.find(program);
140 auto shader_it = m_allocated_shaders.find(shader);
141 // FIXME: implement check "GL_INVALID_VALUE is generated if either program or shader is not a value generated by OpenGL."
142 RETURN_WITH_ERROR_IF(program_it == m_allocated_programs.end(), GL_INVALID_OPERATION);
143 RETURN_WITH_ERROR_IF(shader_it == m_allocated_shaders.end(), GL_INVALID_OPERATION);
144
145 // NOTE: attach_result is Error if the shader is already attached to this program
146 auto attach_result = program_it->value->attach_shader(*shader_it->value);
147 RETURN_WITH_ERROR_IF(attach_result.is_error() && attach_result.error().is_errno() && attach_result.error().code() == ENOMEM, GL_OUT_OF_MEMORY);
148 RETURN_WITH_ERROR_IF(attach_result.is_error(), GL_INVALID_OPERATION);
149}
150
151void GLContext::gl_link_program(GLuint program)
152{
153 auto program_it = m_allocated_programs.find(program);
154 // FIXME: implement check "GL_INVALID_VALUE is generated if program is not a value generated by OpenGL."
155 RETURN_WITH_ERROR_IF(program_it == m_allocated_programs.end(), GL_INVALID_OPERATION);
156 // FIXME: implement check "GL_INVALID_OPERATION is generated if program is the currently active program object and transform feedback mode is active."
157
158 // NOTE: We are ignoring the link result since this is tracked inside the program object
159 (void)program_it->value->link(*m_rasterizer);
160}
161
162void GLContext::gl_use_program(GLuint program)
163{
164 if (program == 0) {
165 m_current_program = nullptr;
166 return;
167 }
168
169 auto it = m_allocated_programs.find(program);
170
171 // FIXME: implement check "GL_INVALID_VALUE is generated if program is not a value generated by OpenGL."
172 RETURN_WITH_ERROR_IF(it == m_allocated_programs.end(), GL_INVALID_OPERATION);
173 // FIXME: implement check "GL_INVALID_OPERATION is generated if transform feedback mode is active."
174 RETURN_WITH_ERROR_IF(it->value->link_status() != true, GL_INVALID_OPERATION);
175
176 m_current_program = it->value;
177}
178
179void GLContext::gl_get_program(GLuint program, GLenum pname, GLint* params)
180{
181 auto it = m_allocated_programs.find(program);
182
183 // FIXME: implement check "GL_INVALID_VALUE is generated if program is not a value generated by OpenGL."
184 RETURN_WITH_ERROR_IF(it == m_allocated_programs.end(), GL_INVALID_OPERATION);
185 // FIXME: implement check "GL_INVALID_OPERATION is generated if pname is GL_GEOMETRY_VERTICES_OUT, GL_GEOMETRY_INPUT_TYPE, or GL_GEOMETRY_OUTPUT_TYPE, and program does not contain a geometry shader."
186
187 // FIXME: implement all the other allowed pname values (https://registry.khronos.org/OpenGL-Refpages/gl4/html/glGetProgram.xhtml)
188 RETURN_WITH_ERROR_IF(pname != GL_DELETE_STATUS
189 && pname != GL_LINK_STATUS
190 && pname != GL_INFO_LOG_LENGTH,
191 GL_INVALID_ENUM);
192
193 // FIXME: implement check "GL_INVALID_OPERATION is generated if pname is GL_COMPUTE_WORK_GROUP_SIZE and program does not contain a binary for the compute shader stage."
194
195 switch (pname) {
196 case GL_DELETE_STATUS:
197 // FIXME: Return the actual delete status once we implement this missing feature
198 *params = GL_FALSE;
199 break;
200
201 case GL_LINK_STATUS:
202 *params = it->value->link_status() ? GL_TRUE : GL_FALSE;
203 break;
204
205 case GL_INFO_LOG_LENGTH:
206 *params = it->value->info_log_length();
207 break;
208
209 default:
210 VERIFY_NOT_REACHED();
211 }
212}
213
214}