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[105/906] up Sobel filter and gl/glew version checker

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git-svn-id: svn://svn.wobow.com/GStreamer_playground/gst-plugins-gl@518 93df14bb-0f41-7a43-8087-d3e2a2f0e464
This commit is contained in:
Julien Isorce 2008-06-15 18:31:12 +00:00 committed by Matthew Waters
parent f0a68351b3
commit 646aaf4cd3
2 changed files with 46 additions and 22 deletions
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22
gst-libs/gst/gl/gstgldisplay.c
View file

@ -496,24 +496,26 @@ gst_gl_display_glutCreateWindow (GstGLDisplay *display)
else
{
//OpenGL > 2.1.0 and Glew > 1.5.0
GString* opengl_version = g_string_new ((gchar*) glGetString (GL_VERSION));
gboolean check_versions = g_str_has_prefix (opengl_version->str, "2.1");
GString* glew_version = g_string_new ((gchar*) glewGetString (GLEW_VERSION));
check_versions = check_versions && g_str_has_prefix (glew_version->str, "1.5");
GString* opengl_version = g_string_truncate (g_string_new ((gchar*) glGetString (GL_VERSION)), 3);
gfloat opengl_version_f = 0.0f;
GString* glew_version = g_string_truncate (g_string_new ((gchar*) glewGetString (GLEW_VERSION)), 3);
gfloat glew_version_f = 0.0f;
sscanf(opengl_version->str, "%f", &opengl_version_f);
sscanf(glew_version->str, "%f", &glew_version_f);
GST_DEBUG ("GL_VERSION: %s", opengl_version->str);
GST_DEBUG ("GLEW_VERSION: %s", glew_version->str);
GST_DEBUG ("GL_VERSION: %s", glGetString (GL_VERSION));
GST_DEBUG ("GLEW_VERSION: %s", glewGetString (GLEW_VERSION));
GST_DEBUG ("GL_VENDOR: %s\n", glGetString (GL_VENDOR));
GST_DEBUG ("GL_RENDERER: %s\n", glGetString (GL_RENDERER));
GST_DEBUG ("GL_VENDOR: %s", glGetString (GL_VENDOR));
GST_DEBUG ("GL_RENDERER: %s", glGetString (GL_RENDERER));
g_string_free (opengl_version, TRUE);
g_string_free (glew_version, TRUE);
if (!check_versions)
if (opengl_version_f < 1.4f || glew_version_f < 1.4)
{
GST_DEBUG ("Required OpenGL > 2.1.0 and Glew > 1.5.0");
GST_DEBUG ("Required OpenGL >= 1.4.0 and Glew >= 1.4.0");
g_assert_not_reached ();
}
}

46
gst/gl/gstglfilteredge.c
View file

@ -30,7 +30,7 @@ GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static const GstElementDetails element_details =
GST_ELEMENT_DETAILS ("OpenGL edge filter",
"Filter/Effect",
"Edge detection",
"Edge detection using GLSL",
"Julien Isorce <julien.isorce@gmail.com>");
enum
@ -86,12 +86,33 @@ gst_gl_filter_edge_init (GstGLFilterEdge* filter,
filter->textShader =
"uniform sampler2DRect tex;\n"
"void main(void) {\n"
" float r,g,b,y;\n"
" vec2 nxy=gl_TexCoord[0].xy;\n"
" r=texture2DRect(tex,nxy).r;\n"
" g=texture2DRect(tex,nxy).g;\n"
" b=texture2DRect(tex,nxy).b;\n"
" gl_FragColor=vec4(b,g,r,1.0);\n"
" const int N = 8;\n"
" const vec2 delta[N] = vec2[N](\n"
" vec2( -1.0, -1.0 ),\n"
" vec2( -1.0 , 0.0 ),\n"
" vec2( -1.0 , 1.0 ),\n"
" vec2( 0.0 , 1.0 ),\n"
" vec2( 1.0 , 1.0 ),\n"
" vec2( 1.0 , 0.0 ),\n"
" vec2( 1.0 , -1.0 ),\n"
" vec2( 0.0 , -1.0 )\n"
" );\n"
" const float filterH[N] = float[N]\n"
" (-1.0, 0.0, 1.0, 2.0, 1.0, 0.0, -1.0, -2.0);\n"
" const float filterV[N] = float[N]\n"
" (-1.0, -2.0, -1.0, 0.0, 1.0, 2.0, 1.0, 0.0);\n"
" float gH = 0.0;\n"
" float gV = 0.0;\n"
" int i;\n"
" vec2 nxy = gl_TexCoord[0].xy;\n"
" for (i = 0; i < N; i++) {\n"
" vec4 vcolor_i = texture2DRect(tex, nxy + delta[i]);\n"
" float gray_i = (vcolor_i.r + vcolor_i.g + vcolor_i.b) / 3.0;\n"
" gH += gH + filterH[i] * gray_i;\n"
" gV += gV + filterV[i] * gray_i;\n"
" }\n"
" float g = sqrt(gH * gH + gV * gV) / 8.0;\n"
" gl_FragColor = vec4(g, g, g, 1.0);\n"
"}\n";
}
@ -186,13 +207,14 @@ gst_gl_filter_edge_callback (guint width, guint height, guint texture, GLhandleA
glBindTexture (GL_TEXTURE_RECTANGLE_ARB, texture);
glBegin (GL_QUADS);
glTexCoord2i (width, 0);
glVertex2f (1.0f, 1.0f);
glTexCoord2i (0, 0);
glVertex2f (-1.0f, 1.0f);
glTexCoord2i (0, height);
glVertex2f (-1.0f, -1.0f);
glTexCoord2i (width, height);
glTexCoord2i (width, 0);
glVertex2f (1.0f, -1.0f);
glTexCoord2i (width, height);
glVertex2f (1.0f, 1.0f);
glTexCoord2i (0, height);
glVertex2f (-1.0f, 1.0f);
glEnd ();
}