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[443/906] sobel: move some highly duplicated code into glfilter

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Add a new convenience function in GstGLFilter that just draws an input
texture to a target texture using a simple shader with just a "tex"
uniform sampler.
Move draw_texture from glfiltersobel to glfilter. Still need to update
other plugins to this.
This commit is contained in:
Filippo Argiolas 2010-04-29 08:27:29 +02:00 committed by Tim-Philipp Müller
parent c390c30aac
commit 306526a19f
2 changed files with 62 additions and 1 deletions
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57
gst-libs/gst/gl/gstglfilter.c
View file

@ -223,10 +223,12 @@ gst_gl_filter_reset (GstGLFilter * filter)
g_object_unref (filter->display);
filter->display = NULL;
}
filter->width = 0;
filter->height = 0;
filter->fbo = 0;
filter->depthbuffer = 0;
filter->default_shader = NULL;
filter->external_gl_context = 0;
}
@ -252,7 +254,8 @@ gst_gl_filter_start (GstBaseTransform * bt)
else {
/* this gl filter is a sink in terms of the gl chain */
filter->display = gst_gl_display_new ();
gst_gl_display_create_context (filter->display, filter->external_gl_context);
gst_gl_display_create_context (filter->display,
filter->external_gl_context);
}
}
@ -442,3 +445,55 @@ gst_gl_filter_render_to_target (GstGLFilter * filter,
0, filter->width, 0, filter->height,
GST_GL_DISPLAY_PROJECTION_ORTHO2D, data);
}
static void
_draw_with_shader_cb (gint width, gint height, guint texture, gpointer stuff)
{
GstGLFilter *filter = GST_GL_FILTER (stuff);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gst_gl_shader_use (filter->default_shader);
glActiveTexture (GL_TEXTURE1);
glEnable (GL_TEXTURE_RECTANGLE_ARB);
glBindTexture (GL_TEXTURE_RECTANGLE_ARB, texture);
glDisable (GL_TEXTURE_RECTANGLE_ARB);
gst_gl_shader_set_uniform_1i (filter->default_shader, "tex", 1);
gst_gl_filter_draw_texture (filter, texture);
}
/* attach target to a FBO, use shader, pass input as "tex" uniform to
* the shader, render input to a quad */
void
gst_gl_filter_render_to_target_with_shader (GstGLFilter * filter,
GLuint input, GLuint target, GstGLShader * shader)
{
filter->default_shader = shader;
gst_gl_filter_render_to_target (filter, input, target, _draw_with_shader_cb,
filter);
}
void
gst_gl_filter_draw_texture (GstGLFilter * filter, GLuint texture)
{
glActiveTexture (GL_TEXTURE0);
glEnable (GL_TEXTURE_RECTANGLE_ARB);
glBindTexture (GL_TEXTURE_RECTANGLE_ARB, texture);
glBegin (GL_QUADS);
glTexCoord2f (0.0, 0.0);
glVertex2f (-1.0, -1.0);
glTexCoord2f ((gfloat) filter->width, 0.0);
glVertex2f (1.0, -1.0);
glTexCoord2f ((gfloat) filter->width, (gfloat) filter->height);
glVertex2f (1.0, 1.0);
glTexCoord2f (0.0, (gfloat) filter->height);
glVertex2f (-1.0, 1.0);
glEnd ();
}

6
gst-libs/gst/gl/gstglfilter.h
View file

@ -64,6 +64,8 @@ struct _GstGLFilter
GLuint fbo;
GLuint depthbuffer;
GstGLShader *default_shader;
gulong external_gl_context;
};
@ -90,7 +92,11 @@ void
gst_gl_filter_render_to_target (GstGLFilter *filter,
GLuint input, GLuint target,
GLCB func, gpointer data);
void
gst_gl_filter_render_to_target_with_shader (GstGLFilter * filter,
GLuint input, GLuint target, GstGLShader *shader);
void gst_gl_filter_draw_texture (GstGLFilter *filter, GLuint texture);
G_END_DECLS