gstreamer/ext/gl/gstglbumper.c

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/*
* GStreamer
* Copyright (C) 2008 Cyril Comparon <cyril.comparon@gmail.com>
* Copyright (C) 2008 Julien Isorce <julien.isorce@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
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/**
* SECTION:element-glbumper
*
* Bump mapping using the normal method.
*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch -v videotestsrc ! glupload ! glbumper location=normalmap.bmp ! glimagesink
* ]| A pipeline to test normal mapping.
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* FBO (Frame Buffer Object) and GLSL (OpenGL Shading Language) are required.
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* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <png.h>
#include "gstglbumper.h"
#if PNG_LIBPNG_VER >= 10400
#define int_p_NULL NULL
#define png_infopp_NULL NULL
#endif
#define GST_CAT_DEFAULT gst_gl_bumper_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
enum
{
PROP_0,
PROP_LOCATION
};
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_bumper_debug, "glbumper", 0, "glbumper element");
G_DEFINE_TYPE_WITH_CODE (GstGLBumper, gst_gl_bumper, GST_TYPE_GL_FILTER,
DEBUG_INIT);
static void gst_gl_bumper_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gl_bumper_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_gl_bumper_reset (GstGLFilter * filter);
static gboolean gst_gl_bumper_init_shader (GstGLFilter * filter);
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static gboolean gst_gl_bumper_filter_texture (GstGLFilter * filter,
guint in_tex, guint out_tex);
static void gst_gl_bumper_callback (gint width, gint height, guint texture,
gpointer stuff);
//vertex source
static const gchar *bumper_v_src =
"attribute vec3 aTangent;\n"
"\n"
"varying vec3 vNormal;\n"
"varying vec3 vTangent;\n"
"varying vec3 vVertexToLight0;\n"
"varying vec3 vVertexToLight1;\n"
"\n"
"void main()\n"
"{\n"
" // transform the vertex\n"
" gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * gl_Vertex;\n"
"\n"
" // transform the normal and the tangent to scene coords\n"
" vNormal = normalize(gl_NormalMatrix * gl_Normal);\n"
" vTangent = normalize(gl_NormalMatrix * aTangent);\n"
"\n"
" // transforming the vertex position to modelview-space\n"
" //const vec4 vertexInSceneCoords = gl_ModelViewMatrix * gl_Vertex;\n"
"\n"
" // calculate the vector from the vertex position to the light position\n"
" vVertexToLight0 = normalize(gl_LightSource[0].position).xyz;\n"
" vVertexToLight1 = normalize(gl_LightSource[1].position).xyz;\n"
"\n"
" // transit vertex color\n"
" gl_FrontColor = gl_BackColor = gl_Color;\n"
"\n"
" // use the two first sets of texture coordinates in the fragment shader\n"
" gl_TexCoord[0] = gl_MultiTexCoord0;\n"
" gl_TexCoord[1] = gl_MultiTexCoord1;\n" "}\n";
//fragment source
static const gchar *bumper_f_src =
"uniform sampler2D texture0;\n"
"uniform sampler2D texture1;\n"
"\n"
"varying vec3 vNormal;\n"
"varying vec3 vTangent;\n"
"varying vec3 vVertexToLight0;\n"
"varying vec3 vVertexToLight1;\n"
"\n"
"void main()\n"
"{\n"
" // get the color of the textures\n"
" vec4 textureColor = texture2D(texture0, gl_TexCoord[0].st);\n"
" vec3 normalmapItem = texture2D(texture1, gl_TexCoord[1].st).xyz * 2.0 - 1.0;\n"
"\n"
" // calculate matrix that transform from tangent space to normalmap space (contrary of intuition)\n"
" vec3 binormal = cross(vNormal, vTangent);\n"
" mat3 tangentSpace2normalmapSpaceMat = mat3(vTangent, binormal, vNormal);\n"
"\n"
" // disturb the normal\n"
" vec3 disturbedNormal = tangentSpace2normalmapSpaceMat * normalmapItem;\n"
"\n"
" // calculate the diffuse term and clamping it to [0;1]\n"
" float diffuseTerm0 = clamp(dot(disturbedNormal, vVertexToLight0), 0.0, 1.0);\n"
" float diffuseTerm1 = clamp(dot(disturbedNormal, vVertexToLight1), 0.0, 1.0);\n"
"\n"
" vec3 irradiance = (diffuseTerm0 * gl_LightSource[0].diffuse.rgb + diffuseTerm1 * gl_LightSource[1].diffuse.rgb);\n"
"\n"
" // calculate the final color\n"
" gl_FragColor = vec4(irradiance * textureColor.rgb, textureColor.w);\n"
"}\n";
#define LOAD_ERROR(context, msg) { gst_gl_context_set_error (context, "unable to load %s: %s", bumper->location, msg); return; }
//png reading error handler
static void
user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
{
g_warning ("%s\n", warning_msg);
}
//Called in the gl thread
static void
gst_gl_bumper_init_resources (GstGLFilter * filter)
{
GstGLBumper *bumper = GST_GL_BUMPER (filter);
GstGLContext *context = filter->context;
const GstGLFuncs *gl = context->gl_vtable;
png_structp png_ptr;
png_infop info_ptr;
png_uint_32 width = 0;
png_uint_32 height = 0;
gint bit_depth = 0;
gint color_type = 0;
gint interlace_type = 0;
png_FILE_p fp = NULL;
guint y = 0;
guchar *raw_data = NULL;
guchar **rows = NULL;
png_byte magic[8];
gint n_read;
if (!bumper->location) {
gst_gl_context_set_error (context, "A filename is required");
return;
}
/* BEGIN load png image file */
if ((fp = fopen (bumper->location, "rb")) == NULL)
LOAD_ERROR (context, "file not found");
/* Read magic number */
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n_read = fread (magic, 1, sizeof (magic), fp);
if (n_read != sizeof (magic)) {
fclose (fp);
LOAD_ERROR (context, "can't read PNG magic number");
}
/* Check for valid magic number */
if (png_sig_cmp (magic, 0, sizeof (magic))) {
fclose (fp);
LOAD_ERROR (context, "not a valid PNG image");
}
png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL) {
fclose (fp);
LOAD_ERROR (context, "failed to initialize the png_struct");
}
png_set_error_fn (png_ptr, NULL, NULL, user_warning_fn);
info_ptr = png_create_info_struct (png_ptr);
if (info_ptr == NULL) {
fclose (fp);
png_destroy_read_struct (&png_ptr, png_infopp_NULL, png_infopp_NULL);
LOAD_ERROR (context,
"failed to initialize the memory for image information");
}
png_init_io (png_ptr, fp);
png_set_sig_bytes (png_ptr, sizeof (magic));
png_read_info (png_ptr, info_ptr);
png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
&interlace_type, int_p_NULL, int_p_NULL);
if (color_type != PNG_COLOR_TYPE_RGB) {
fclose (fp);
png_destroy_read_struct (&png_ptr, png_infopp_NULL, png_infopp_NULL);
LOAD_ERROR (context, "color type is not rgb");
}
raw_data = (guchar *) malloc (sizeof (guchar) * width * height * 3);
rows = (guchar **) malloc (sizeof (guchar *) * height);
for (y = 0; y < height; ++y)
rows[y] = (guchar *) (raw_data + y * width * 3);
png_read_image (png_ptr, rows);
free (rows);
png_read_end (png_ptr, info_ptr);
png_destroy_read_struct (&png_ptr, &info_ptr, png_infopp_NULL);
fclose (fp);
/* END load png image file */
bumper->bumpmap_width = width;
bumper->bumpmap_height = height;
gl->GenTextures (1, &bumper->bumpmap);
gl->BindTexture (GL_TEXTURE_2D, bumper->bumpmap);
gl->TexImage2D (GL_TEXTURE_2D, 0, GL_RGBA,
bumper->bumpmap_width, bumper->bumpmap_height, 0,
GL_RGB, GL_UNSIGNED_BYTE, raw_data);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
free (raw_data);
}
//Called in the gl thread
static void
gst_gl_bumper_reset_resources (GstGLFilter * filter)
{
GstGLBumper *bumper = GST_GL_BUMPER (filter);
if (bumper->bumpmap) {
glDeleteTextures (1, &bumper->bumpmap);
bumper->bumpmap = 0;
}
}
static void
gst_gl_bumper_class_init (GstGLBumperClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_gl_bumper_set_property;
gobject_class->get_property = gst_gl_bumper_get_property;
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GST_GL_FILTER_CLASS (klass)->filter_texture = gst_gl_bumper_filter_texture;
GST_GL_FILTER_CLASS (klass)->display_init_cb = gst_gl_bumper_init_resources;
GST_GL_FILTER_CLASS (klass)->display_reset_cb = gst_gl_bumper_reset_resources;
GST_GL_FILTER_CLASS (klass)->onInitFBO = gst_gl_bumper_init_shader;
GST_GL_FILTER_CLASS (klass)->onReset = gst_gl_bumper_reset;
g_object_class_install_property (gobject_class,
PROP_LOCATION, g_param_spec_string ("location",
"Normal map location",
"Normal map location", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_metadata (element_class, "OpenGL bumper filter",
"Filter/Effect/Video", "Bump mapping filter",
"Cyril Comparon <cyril.comparon@gmail.com>, "
"Julien Isorce <julien.isorce@gmail.com>");
}
static void
gst_gl_bumper_init (GstGLBumper * bumper)
{
bumper->shader = NULL;
bumper->bumpmap = 0;
bumper->bumpmap_width = 0;
bumper->bumpmap_height = 0;
bumper->location = NULL;
}
static void
gst_gl_bumper_reset (GstGLFilter * filter)
{
GstGLBumper *bumper_filter = GST_GL_BUMPER (filter);
//blocking call, wait the opengl thread has destroyed the shader
if (bumper_filter->shader)
gst_gl_context_del_shader (filter->context, bumper_filter->shader);
bumper_filter->shader = NULL;
}
static void
gst_gl_bumper_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLBumper *bumper = GST_GL_BUMPER (object);
switch (prop_id) {
case PROP_LOCATION:
if (bumper->location != NULL)
g_free (bumper->location);
bumper->location = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_bumper_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLBumper *bumper = GST_GL_BUMPER (object);
switch (prop_id) {
case PROP_LOCATION:
g_value_set_string (value, bumper->location);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_gl_bumper_init_shader (GstGLFilter * filter)
{
GstGLBumper *bumper = GST_GL_BUMPER (filter);
//blocking call, wait the opengl thread has compiled the shader
return gst_gl_context_gen_shader (filter->context, bumper_v_src, bumper_f_src,
&bumper->shader);
}
static gboolean
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gst_gl_bumper_filter_texture (GstGLFilter * filter, guint in_tex, guint out_tex)
{
gpointer bumper_filter = GST_GL_BUMPER (filter);
//blocking call, use a FBO
gst_gl_context_use_fbo (filter->context,
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GST_VIDEO_INFO_WIDTH (&filter->out_info),
GST_VIDEO_INFO_HEIGHT (&filter->out_info),
filter->fbo, filter->depthbuffer, out_tex, gst_gl_bumper_callback,
GST_VIDEO_INFO_WIDTH (&filter->in_info),
GST_VIDEO_INFO_HEIGHT (&filter->in_info),
in_tex, 45,
(gdouble) GST_VIDEO_INFO_WIDTH (&filter->out_info) /
(gdouble) GST_VIDEO_INFO_HEIGHT (&filter->out_info), 0.1, 50,
GST_GL_DISPLAY_PROJECTION_PERSPECTIVE, bumper_filter);
return TRUE;
}
typedef struct _MeshData
{
float x, y, z; /* Vertex */
float nx, ny, nz; /* Normal */
float s0, t0; /* TexCoord0 */
float s1, t1; /* TexCoord1 */
float va0, vb0, vc0; /* VertexAttrib */
} MeshData;
//opengl scene, params: input texture (not the output filter->texture)
static void
gst_gl_bumper_callback (gint width, gint height, guint texture, gpointer stuff)
{
static GLfloat xrot = 0;
static GLfloat yrot = 0;
static GLfloat zrot = 0;
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GstGLFuncs *gl;
GstGLBumper *bumper = GST_GL_BUMPER (stuff);
GstGLContext *context = GST_GL_FILTER (bumper)->context;
GLint locTangent = 0;
//choose the lights
GLfloat light_direction0[] = { 1.0, 0.0, -1.0, 0.0 }; // light goes along -x
GLfloat light_direction1[] = { -1.0, 0.0, -1.0, 0.0 }; // light goes along x
GLfloat light_diffuse0[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat light_diffuse1[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat mat_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
/* *INDENT-OFF* */
MeshData mesh[] = {
/* | Vertex | Normal |TexCoord0|TexCoord1| VertexAttrib | */
/*F*/ { 1.0, 1.0, -1.0, 0.0, 0.0, -1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0},
/*r*/ { 1.0, -1.0, -1.0, 0.0, 0.0, -1.0, 1.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0},
/*o*/ {-1.0, -1.0, -1.0, 0.0, 0.0, -1.0, 1.0, 1.0, 1.0, 1.0, 0.0, 1.0, 0.0},
{-1.0, 1.0, -1.0, 0.0, 0.0, -1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0},
/*R*/ {-1.0, 1.0, -1.0, -1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0},
/*i*/ {-1.0, -1.0, -1.0, -1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0},
/*g*/ {-1.0, -1.0, 1.0, -1.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0, 0.0, 1.0, 0.0},
{-1.0, 1.0, 1.0, -1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0},
/*B*/ {-1.0, 1.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0},
/*a*/ {-1.0, -1.0, 1.0, 0.0, 0.0, 1.0, 1.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0},
/*c*/ { 1.0, -1.0, 1.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.0, 1.0, 0.0},
{ 1.0, 1.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0},
/*L*/ { 1.0, 1.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0},
/*e*/ { 1.0, -1.0, 1.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0},
/*f*/ { 1.0, -1.0, -1.0, 1.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0, 0.0, 1.0, 0.0},
{ 1.0, 1.0, -1.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0},
/*T*/ { 1.0, 1.0, 1.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0},
/*o*/ { 1.0, 1.0, -1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0},
/*p*/ {-1.0, 1.0, -1.0, 0.0, 1.0, 0.0, 1.0, 1.0, 1.0, 1.0, 0.0, 0.0, 1.0},
{-1.0, 1.0, 1.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0, 1.0},
/*B*/ { 1.0, -1.0, -1.0, 0.0, -1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -1.0},
/*o*/ { 1.0, -1.0, 1.0, 0.0, -1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0, 0.0, -1.0},
/*t*/ {-1.0, -1.0, 1.0, 0.0, -1.0, 0.0, 1.0, 1.0, 1.0, 1.0, 0.0, 0.0, -1.0},
{-1.0, -1.0, -1.0, 0.0, -1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0, -1.0},
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};
GLushort indices[] = {
0, 1, 2,
0, 2, 3,
4, 5, 6,
4, 6, 7,
8, 9, 10,
8, 10, 11,
12, 13, 14,
12, 14, 15,
16, 17, 18,
16, 18, 19,
20, 21, 22,
20, 22, 23
};
/* *INDENT-ON* */
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gl = GST_GL_FILTER (bumper)->context->gl_vtable;
//eye point
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gl->MatrixMode (GL_PROJECTION);
gluLookAt (0.0, 0.0, -6.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
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gl->MatrixMode (GL_MODELVIEW);
//scene conf
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gl->Enable (GL_DEPTH_TEST);
gl->DepthFunc (GL_LEQUAL);
gl->Hint (GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
gl->ShadeModel (GL_SMOOTH);
//set the lights
gl->Lightfv (GL_LIGHT0, GL_POSITION, light_direction0);
gl->Lightfv (GL_LIGHT0, GL_DIFFUSE, light_diffuse0);
gl->Lightfv (GL_LIGHT1, GL_POSITION, light_direction1);
gl->Lightfv (GL_LIGHT1, GL_DIFFUSE, light_diffuse1);
gl->Materialfv (GL_FRONT, GL_DIFFUSE, mat_diffuse);
gl->ColorMaterial (GL_FRONT_AND_BACK, GL_DIFFUSE);
gl->Enable (GL_COLOR_MATERIAL);
gl->Enable (GL_LIGHTING);
gl->Enable (GL_LIGHT0);
gl->Enable (GL_LIGHT1);
//configure shader
gst_gl_shader_use (bumper->shader);
locTangent =
gst_gl_shader_get_attribute_location (bumper->shader, "aTangent");
//set the normal map
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gl->ActiveTexture (GL_TEXTURE1);
gst_gl_shader_set_uniform_1i (bumper->shader, "texture1", 1);
gl->BindTexture (GL_TEXTURE_2D, bumper->bumpmap);
//set the video texture
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gl->ActiveTexture (GL_TEXTURE0);
gst_gl_shader_set_uniform_1i (bumper->shader, "texture0", 0);
gl->BindTexture (GL_TEXTURE_2D, texture);
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gl->Rotatef (xrot, 1.0f, 0.0f, 0.0f);
gl->Rotatef (yrot, 0.0f, 1.0f, 0.0f);
gl->Rotatef (zrot, 0.0f, 0.0f, 1.0f);
gl->EnableVertexAttribArray (locTangent);
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gl->ClientActiveTexture (GL_TEXTURE0);
gl->EnableClientState (GL_TEXTURE_COORD_ARRAY);
gl->EnableClientState (GL_VERTEX_ARRAY);
gl->EnableClientState (GL_NORMAL_ARRAY);
gl->VertexAttribPointer (locTangent, 3, GL_FLOAT, 0, sizeof (MeshData),
&mesh[0].va0);
gl->VertexPointer (3, GL_FLOAT, sizeof (MeshData), &mesh[0].x);
gl->NormalPointer (GL_FLOAT, sizeof (MeshData), &mesh[0].nx);
gl->TexCoordPointer (2, GL_FLOAT, sizeof (MeshData), &mesh[0].s0);
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gl->ClientActiveTexture (GL_TEXTURE1);
gl->EnableClientState (GL_TEXTURE_COORD_ARRAY);
gl->TexCoordPointer (2, GL_FLOAT, sizeof (MeshData), &mesh[0].s1);
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gl->DrawElements (GL_TRIANGLES, 36, GL_UNSIGNED_SHORT, indices);
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gl->DisableClientState (GL_VERTEX_ARRAY);
gl->DisableClientState (GL_TEXTURE_COORD_ARRAY);
gl->DisableClientState (GL_NORMAL_ARRAY);
gl->ClientActiveTexture (GL_TEXTURE0);
gl->DisableClientState (GL_TEXTURE_COORD_ARRAY);
gl->DisableVertexAttribArray (locTangent);
gst_gl_context_clear_shader (context);
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gl->Disable (GL_LIGHT0);
gl->Disable (GL_LIGHT1);
gl->Disable (GL_LIGHTING);
gl->Disable (GL_COLOR_MATERIAL);
xrot += 1.0f;
yrot += 0.9f;
zrot += 0.6f;
}