]>
git.proxmox.com Git - mirror_qemu.git/blob - ui/shader.c
2 * QEMU opengl shader helper functions
4 * Copyright (c) 2014 Red Hat
7 * Gerd Hoffmann <kraxel@redhat.com>
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to deal
11 * in the Software without restriction, including without limitation the rights
12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 * copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
27 #include "qemu-common.h"
28 #include "ui/shader.h"
30 /* ---------------------------------------------------------------------- */
32 GLuint
qemu_gl_init_texture_blit(GLint texture_blit_prog
)
34 static const GLfloat in_position
[] = {
43 glGenVertexArrays(1, &vao
);
44 glBindVertexArray(vao
);
46 /* this is the VBO that holds the vertex data */
47 glGenBuffers(1, &buffer
);
48 glBindBuffer(GL_ARRAY_BUFFER
, buffer
);
49 glBufferData(GL_ARRAY_BUFFER
, sizeof(in_position
), in_position
,
52 l_position
= glGetAttribLocation(texture_blit_prog
, "in_position");
53 glVertexAttribPointer(l_position
, 2, GL_FLOAT
, GL_FALSE
, 0, 0);
54 glEnableVertexAttribArray(l_position
);
56 glBindBuffer(GL_ARRAY_BUFFER
, 0);
62 void qemu_gl_run_texture_blit(GLint texture_blit_prog
,
63 GLint texture_blit_vao
)
65 glUseProgram(texture_blit_prog
);
66 glBindVertexArray(texture_blit_vao
);
67 glDrawArrays(GL_TRIANGLE_STRIP
, 0, 4);
70 /* ---------------------------------------------------------------------- */
72 GLuint
qemu_gl_create_compile_shader(GLenum type
, const GLchar
*src
)
78 shader
= glCreateShader(type
);
79 glShaderSource(shader
, 1, &src
, 0);
80 glCompileShader(shader
);
82 glGetShaderiv(shader
, GL_COMPILE_STATUS
, &status
);
84 glGetShaderiv(shader
, GL_INFO_LOG_LENGTH
, &length
);
85 errmsg
= malloc(length
);
86 glGetShaderInfoLog(shader
, length
, &length
, errmsg
);
87 fprintf(stderr
, "%s: compile %s error\n%s\n", __func__
,
88 (type
== GL_VERTEX_SHADER
) ? "vertex" : "fragment",
96 GLuint
qemu_gl_create_link_program(GLuint vert
, GLuint frag
)
102 program
= glCreateProgram();
103 glAttachShader(program
, vert
);
104 glAttachShader(program
, frag
);
105 glLinkProgram(program
);
107 glGetProgramiv(program
, GL_LINK_STATUS
, &status
);
109 glGetProgramiv(program
, GL_INFO_LOG_LENGTH
, &length
);
110 errmsg
= malloc(length
);
111 glGetProgramInfoLog(program
, length
, &length
, errmsg
);
112 fprintf(stderr
, "%s: link program: %s\n", __func__
, errmsg
);
119 GLuint
qemu_gl_create_compile_link_program(const GLchar
*vert_src
,
120 const GLchar
*frag_src
)
122 GLuint vert_shader
, frag_shader
, program
;
124 vert_shader
= qemu_gl_create_compile_shader(GL_VERTEX_SHADER
, vert_src
);
125 frag_shader
= qemu_gl_create_compile_shader(GL_FRAGMENT_SHADER
, frag_src
);
126 if (!vert_shader
|| !frag_shader
) {
130 program
= qemu_gl_create_link_program(vert_shader
, frag_shader
);
131 glDeleteShader(vert_shader
);
132 glDeleteShader(frag_shader
);