Keep FBOs around in EffectChain again.

[movit] / util.cpp

diff --git a/util.cpp b/util.cpp
index 9c2ce597499d42a829097ddb5e3700341fde2ca1..1e66c30b573e51ef419146d5149c32ed9e53e7d3 100644 (file)
--- a/util.cpp
+++ b/util.cpp
@@ -9,8 +9,18 @@
 #include "init.h"
 #include "util.h"
 
+#if defined(__DARWIN__)
+#include <OpenGL/OpenGL.h>
+#elif defined(WIN32)
+#include <GL/wglew.h>
+#else
+#include <GL/glxew.h>
+#endif
+
 using namespace std;
 
+namespace movit {
+
 extern string *movit_data_directory;
 
 void hsv2rgb(float h, float s, float v, float *r, float *g, float *b)
@@ -99,7 +109,7 @@ GLuint compile_shader(const string &shader_src, GLenum type)
        glGetShaderInfoLog(obj, log_length, &log_length, info_log);
        info_log[log_length] = 0; 
        if (strlen(info_log) > 0) {
-               printf("shader compile log: %s\n", info_log);
+               fprintf(stderr, "Shader compile log: %s\n", info_log);
        }
 
        GLint status;
@@ -175,3 +185,71 @@ void combine_two_samples(float w1, float w2, float *offset, float *total_weight,
        assert(*offset >= 0.0f);
        assert(*offset <= 1.0f);
 }
+
+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());
+       if (attrib == -1) {
+               return -1;
+       }
+
+       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();
+       glEnableVertexAttribArray(attrib);
+       check_error();
+       glVertexAttribPointer(attrib, size, type, GL_FALSE, 0, BUFFER_OFFSET(0));
+       check_error();
+       glBindBuffer(GL_ARRAY_BUFFER, 0);
+       check_error();
+
+       return vbo;
+}
+
+void cleanup_vertex_attribute(GLuint glsl_program_num, const string &attribute_name, GLuint vbo)
+{
+       int attrib = glGetAttribLocation(glsl_program_num, attribute_name.c_str());
+       if (attrib == -1) {
+               return;
+       }
+
+       glDisableVertexAttribArray(attrib);
+       check_error();
+       glDeleteBuffers(1, &vbo);
+       check_error();
+}
+
+unsigned div_round_up(unsigned a, unsigned b)
+{
+       return (a + b - 1) / b;
+}
+
+// Algorithm from http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2.
+unsigned next_power_of_two(unsigned v)
+{
+       v--;
+       v |= v >> 1;
+       v |= v >> 2;
+       v |= v >> 4;
+       v |= v >> 8;
+       v |= v >> 16;
+       v++;
+       return v;
+}
+
+void *get_gl_context_identifier()
+{
+#if defined(__DARWIN__)
+       return (void *)CGLGetCurrentContext();
+#elif defined(WIN32)
+       return (void *)wglGetCurrentContext();
+#else
+       return (void *)glXGetCurrentContext();
+#endif
+}
+
+}  // namespace movit