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-rw-r--r--qemu/ui/shader.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/qemu/ui/shader.c b/qemu/ui/shader.c
new file mode 100644
index 000000000..52a463293
--- /dev/null
+++ b/qemu/ui/shader.c
@@ -0,0 +1,114 @@
+/*
+ * QEMU opengl shader helper functions
+ *
+ * Copyright (c) 2014 Red Hat
+ *
+ * Authors:
+ * Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "qemu-common.h"
+#include "ui/shader.h"
+
+/* ---------------------------------------------------------------------- */
+
+void qemu_gl_run_texture_blit(GLint texture_blit_prog)
+{
+ GLfloat in_position[] = {
+ -1, -1,
+ 1, -1,
+ -1, 1,
+ 1, 1,
+ };
+ GLint l_position;
+
+ glUseProgram(texture_blit_prog);
+ l_position = glGetAttribLocation(texture_blit_prog, "in_position");
+ glVertexAttribPointer(l_position, 2, GL_FLOAT, GL_FALSE, 0, in_position);
+ glEnableVertexAttribArray(l_position);
+ glDrawArrays(GL_TRIANGLE_STRIP, l_position, 4);
+}
+
+/* ---------------------------------------------------------------------- */
+
+GLuint qemu_gl_create_compile_shader(GLenum type, const GLchar *src)
+{
+ GLuint shader;
+ GLint status, length;
+ char *errmsg;
+
+ shader = glCreateShader(type);
+ glShaderSource(shader, 1, &src, 0);
+ glCompileShader(shader);
+
+ glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
+ if (!status) {
+ glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &length);
+ errmsg = malloc(length);
+ glGetShaderInfoLog(shader, length, &length, errmsg);
+ fprintf(stderr, "%s: compile %s error\n%s\n", __func__,
+ (type == GL_VERTEX_SHADER) ? "vertex" : "fragment",
+ errmsg);
+ free(errmsg);
+ return 0;
+ }
+ return shader;
+}
+
+GLuint qemu_gl_create_link_program(GLuint vert, GLuint frag)
+{
+ GLuint program;
+ GLint status, length;
+ char *errmsg;
+
+ program = glCreateProgram();
+ glAttachShader(program, vert);
+ glAttachShader(program, frag);
+ glLinkProgram(program);
+
+ glGetProgramiv(program, GL_LINK_STATUS, &status);
+ if (!status) {
+ glGetProgramiv(program, GL_INFO_LOG_LENGTH, &length);
+ errmsg = malloc(length);
+ glGetProgramInfoLog(program, length, &length, errmsg);
+ fprintf(stderr, "%s: link program: %s\n", __func__, errmsg);
+ free(errmsg);
+ return 0;
+ }
+ return program;
+}
+
+GLuint qemu_gl_create_compile_link_program(const GLchar *vert_src,
+ const GLchar *frag_src)
+{
+ GLuint vert_shader, frag_shader, program;
+
+ vert_shader = qemu_gl_create_compile_shader(GL_VERTEX_SHADER, vert_src);
+ frag_shader = qemu_gl_create_compile_shader(GL_FRAGMENT_SHADER, frag_src);
+ if (!vert_shader || !frag_shader) {
+ return 0;
+ }
+
+ program = qemu_gl_create_link_program(vert_shader, frag_shader);
+ glDeleteShader(vert_shader);
+ glDeleteShader(frag_shader);
+
+ return program;
+}