functions: add a couple of missing stubs

src/efb.h

@@ -85,8 +85,7 @@ void _ogx_efb_set_content_type_real(OgxEfbContentType content_type);
 /* We inline this part since most of the times the desired content type will be
  * the one already active */
 static inline void _ogx_efb_set_content_type(OgxEfbContentType content_type) {
-    if (content_type == _ogx_efb_content_type &&
-        (content_type != OGX_EFB_SCENE || _ogx_fbo_state.dirty.all == 0))
+    if (content_type == _ogx_efb_content_type)
         return;
     _ogx_efb_set_content_type_real(content_type);
 }

src/fbo.c

@@ -367,3 +367,28 @@ void glFramebufferTexture3D(GLenum target, GLenum attachment, GLenum textarget,
     warning("glFramebufferTexture3D is unsupported");
     set_error(GL_INVALID_OPERATION);
 }
+
+void ogx_enable_module_fbo() {
+    _ogx_add_extension("GL_EXT_framebuffer_object");
+}
+
+/* FBOs are in OpenGL 3.0, and in older versions as an extension */
+#define PROC(name) \
+    { #name, name }, \
+    { #name "EXT", name }
+static const OgxProcMap s_proc_map[] = {
+    PROC(glBindFramebuffer),
+    PROC(glCheckFramebufferStatus),
+    PROC(glDeleteFramebuffers),
+    PROC(glFramebufferTexture1D),
+    PROC(glFramebufferTexture2D),
+    PROC(glFramebufferTexture3D),
+    PROC(glGenFramebuffers),
+    PROC(glIsFramebuffer),
+};
+#define NUM_PROCS (sizeof(s_proc_map) / sizeof(s_proc_map[0]))
+
+OgxFunctions _ogx_fbo_functions = {
+    NUM_PROCS,
+    s_proc_map,
+};

src/fbo.h

@@ -87,7 +87,11 @@ bool _ogx_fbo_get_integerv(GLenum pname, GLint *params);
 void _ogx_fbo_scene_save_from_efb(OgxEfbContentType next_content_type);
 void _ogx_fbo_scene_load_into_efb(void);
 
-#ifndef BUILDING_FBO_CODE
+#ifdef BUILDING_FBO_CODE
+
+extern OgxFunctions _ogx_fbo_functions;
+
+#else /* BUILDING_FBO_CODE not defined */
 
 OgxFboState _ogx_fbo_state __attribute__((weak)) = { 0, 0 };
 
@@ -106,6 +110,8 @@ void __attribute__((weak)) _ogx_fbo_scene_load_into_efb()
     _ogx_scene_load_into_efb();
 }
 
+OgxFunctions _ogx_fbo_functions __attribute__((weak)) = { 0, NULL };
+
 #endif /* BUILDING_FBO_CODE */
 
 #ifdef __cplusplus

src/functions.c

@@ -29,6 +29,7 @@ POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/
 
 #define GL_GLEXT_PROTOTYPES 1
+#include "fbo.h"
 #include "opengx.h"
 #include "shader.h"
 #include "types.h"
@@ -51,7 +52,9 @@ static const OgxProcMap s_proc_map[] = {
     PROC(glBindBuffer), /* OpenGL 1.5 */
     PROC(glBindTexture),
     PROC(glBitmap),
+    PROC(glBlendEquation),
     PROC(glBlendFunc),
+    PROC(glBlendFuncSeparate),
     PROC(glBufferData), /* OpenGL 1.5 */
     PROC(glBufferSubData), /* OpenGL 1.5 */
     PROC(glCallList),
@@ -470,5 +473,12 @@ void *ogx_get_proc_address(const char *proc)
                                   proc);
         if (ret) return ret;
     }
+
+    if (_ogx_fbo_functions.num_functions > 0) {
+        ret = search_in_functions(_ogx_fbo_functions.functions,
+                                  _ogx_fbo_functions.num_functions,
+                                  proc);
+        if (ret) return ret;
+    }
     return search_in_functions(s_proc_map, NUM_PROCS, proc);
 }

src/gc_gl.c

@@ -1670,6 +1670,13 @@ void glBlendFunc(GLenum sfactor, GLenum dfactor)
     glparamstate.dirty.bits.dirty_blend = 1;
 }
 
+void glBlendFuncSeparate(GLenum sfactor_rgb, GLenum dfactor_rgb,
+                         GLenum sfactor_alpha, GLenum dfactor_alpha)
+{
+    /* This is not correct, but better than nothing */
+    glBlendFunc(sfactor_rgb, dfactor_rgb);
+}
+
 void glPointSize(GLfloat size)
 {
     unsigned int gxsize = size;

src/getters.c

@@ -40,8 +40,9 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <string.h>
 
 static const GLubyte gl_null_string[1] = { 0 };
-/* This is not static because we might modify it in place */
-static GLubyte s_extension_string[] =
+/* This is not const because we might modify it in place.
+ * Make sure that this buffer is large enough to fit all added extensions. */
+static GLubyte s_extension_string[256] =
     "GL_ARB_multitexture "
     "GL_ARB_vertex_buffer_object ";
 
@@ -72,6 +73,11 @@ static GLubyte *get_extension_string(int index)
     return ptr;
 }
 
+void _ogx_add_extension(const GLubyte *name)
+{
+    strcat(s_extension_string, name);
+}
+
 GLenum glGetError(void)
 {
     GLenum error = glparamstate.error;

src/opengx.h

@@ -254,6 +254,9 @@ static inline void ogx_shader_set_modelview_gl(const GLfloat *matrix)
  * matrices, and uploads them separately to GX. */
 void ogx_shader_set_mvp_gl(const GLfloat *matrix);
 
+/* Force the inclusion of the FBO code into the program */
+void ogx_enable_module_fbo();
+
 #ifdef __cplusplus
 } // extern C
 #endif

src/utils.h

@@ -355,6 +355,8 @@ void _ogx_set_projection(const Mtx44 matrix);
 bool _ogx_setup_render_stages(void);
 void _ogx_update_vertex_array_readers(OgxDrawMode mode);
 
+void _ogx_add_extension(const GLubyte *name);
+
 #ifdef __cplusplus
 } // extern C
 #endif