Add some clarifying comments about the intermediate formats.

[movit] / util.cpp

diff --git a/util.cpp b/util.cpp
index 29428aad3e09ed0a1a66a660125433a7db6a3313..3141f8d2c5eb388aec128f31b6218c06c0b1bb8d 100644 (file)
--- a/util.cpp
+++ b/util.cpp
@@ -272,6 +272,21 @@ template
 void combine_two_samples<fp16_int_t>(float w1, float w2, float pos1, float pos2, float num_subtexels, float inv_num_subtexels,
                                      fp16_int_t *offset, fp16_int_t *total_weight, float *sum_sq_error);
 
+GLuint generate_vbo(GLint size, GLenum type, GLsizeiptr data_size, const GLvoid *data)
+{
+       GLuint vbo;
+       glGenBuffers(1, &vbo);
+       check_error();
+       glBindBuffer(GL_ARRAY_BUFFER, vbo);
+       check_error();
+       glBufferData(GL_ARRAY_BUFFER, data_size, data, GL_STATIC_DRAW);
+       check_error();
+       glBindBuffer(GL_ARRAY_BUFFER, 0);
+       check_error();
+
+       return vbo;
+}
+
 GLuint fill_vertex_attribute(GLuint glsl_program_num, const string &attribute_name, GLint size, GLenum type, GLsizeiptr data_size, const GLvoid *data)
 {
        int attrib = glGetAttribLocation(glsl_program_num, attribute_name.c_str());
@@ -279,13 +294,10 @@ GLuint fill_vertex_attribute(GLuint glsl_program_num, const string &attribute_na
                return -1;
        }
 
-       GLuint vbo;
-       glGenBuffers(1, &vbo);
-       check_error();
+       GLuint vbo = generate_vbo(size, type, data_size, data);
+
        glBindBuffer(GL_ARRAY_BUFFER, vbo);
        check_error();
-       glBufferData(GL_ARRAY_BUFFER, data_size, data, GL_STATIC_DRAW);
-       check_error();
        glEnableVertexAttribArray(attrib);
        check_error();
        glVertexAttribPointer(attrib, size, type, GL_FALSE, 0, BUFFER_OFFSET(0));