blinking-teapot is an UBO demo.
---
src/glsl/CMakeLists.txt | 1 +
src/glsl/Makefile.am | 2 +
src/glsl/blinking-teapot.c | 177 +++++++++++++++++++++++++++++++++++++++++
src/glsl/blinking-teapot.frag | 31 +++++++
src/glsl/blinking-teapot.vert | 16 ++++
5 files changed, 227 insertions(+), 0 deletions(-)
create mode 100644 src/glsl/blinking-teapot.c
create mode 100644 src/glsl/blinking-teapot.frag
create mode 100644 src/glsl/blinking-teapot.vert
diff --git a/src/glsl/CMakeLists.txt b/src/glsl/CMakeLists.txt
index 11f8e37..aeaf526 100644
--- a/src/glsl/CMakeLists.txt
+++ b/src/glsl/CMakeLists.txt
@@ -24,6 +24,7 @@ set (targets
bitmap
brick
bump
+ blinking-teapot
convolutions
deriv
fragcoord
diff --git a/src/glsl/Makefile.am b/src/glsl/Makefile.am
index 5a9a802..d9b6f9b 100644
--- a/src/glsl/Makefile.am
+++ b/src/glsl/Makefile.am
@@ -37,6 +37,7 @@ bin_PROGRAMS = \
bitmap \
brick \
bump \
+ blinking-teapot \
convolutions \
deriv \
fragcoord \
@@ -77,6 +78,7 @@ bitmap_LDADD = ../util/libutil.la
bezier_LDADD = ../util/libutil.la
brick_LDADD = ../util/libutil.la
bump_LDADD = ../util/libutil.la
+blinking_teapot_LDADD = ../util/libutil.la
convolutions_LDADD = ../util/libutil.la
deriv_LDADD = ../util/libutil.la
geom_sprites_LDADD = ../util/libutil.la
diff --git a/src/glsl/blinking-teapot.c b/src/glsl/blinking-teapot.c
new file mode 100644
index 0000000..53b385b
--- /dev/null
+++ b/src/glsl/blinking-teapot.c
@@ -0,0 +1,177 @@
+/**
+ * blinking-teapot demo. It displays a teapot whose color go from blue to pink.
+ * The color variation is handled by uniform buffer object.
+ * Sources mostly from http://www.jotschi.de/?p=427 which uses UBO SPEC example
+ *
+ * Vincent Lejeune 2011
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <GL/glew.h>
+#include "glut_wrap.h"
+#include "shaderutil.h"
+
+
+static int mouse_old_x, mouse_old_y;
+static int mouse_buttons = 0;
+static float rotate_x = 0.0, rotate_y = 0.0;
+static float translate_z = -2.0;
+
+static float delta = 0.01;
+static GLfloat wf, hf;
+
+
+static const GLchar *names[] = { "SurfaceColor", "WarmColor", "CoolColor",
+ "DiffuseWarm", "DiffuseCool"
+};
+
+static GLuint buffer_id, uniformBlockIndex, uindex, vshad_id, fshad_id,
+ prog_id;
+
+static GLsizei uniformBlockSize;
+static GLint singleSize;
+static GLint offset;
+
+static const GLfloat colors[] =
+ { 0.45, 0.45, 1, 1, 0.45, 0.45, 1, 1, 0.75, 0.75, 0.75, 1,
+ 0.0, 0.0, 1.0, 1, 0.0, 1.0, 0.0, 1,
+};
+
+static GLfloat teapot_color = 1;
+
+static void
+reshape (int w, int h)
+{
+ wf = (GLfloat) w;
+ hf = (GLfloat) h;
+ glMatrixMode (GL_PROJECTION);
+ glLoadIdentity ();
+ gluPerspective (60.0, wf / hf, 0.1, 100.0);
+}
+
+static void
+init_opengl (void)
+{
+
+ if (!ShadersSupported ())
+ exit (1);
+
+ vshad_id = CompileShaderFile (GL_VERTEX_SHADER, "blinking-teapot.vert");
+ fshad_id = CompileShaderFile (GL_FRAGMENT_SHADER, "blinking-teapot.frag");
+ prog_id = LinkShaders (vshad_id, fshad_id);
+
+ UseProgram (prog_id);
+
+ reshape (680, 400);
+
+ glGenBuffers (1, &buffer_id);
+
+ glBindBuffer (GL_UNIFORM_BUFFER, buffer_id);
+ glBufferData (GL_UNIFORM_BUFFER, uniformBlockSize, NULL, GL_DYNAMIC_DRAW);
+
+ glBindBufferBase (GL_UNIFORM_BUFFER, 0, buffer_id);
+ glUniformBlockBinding (prog_id, uniformBlockIndex, 0);
+
+ glGetUniformIndices (prog_id, 1, &names[2], &uindex);
+
+ glGetActiveUniformsiv (prog_id, 1, &uindex, GL_UNIFORM_OFFSET, &offset);
+ glGetActiveUniformsiv (prog_id, 1, &uindex, GL_UNIFORM_SIZE, &singleSize);
+
+ glViewport (0, 0, 680, 400);
+ glBufferData (GL_UNIFORM_BUFFER, 80, colors, GL_DYNAMIC_DRAW);
+}
+
+static void
+render (void)
+{
+ glClearColor (0.0, 0.0, 0.0, 0.0);
+ glClear (GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
+ glUseProgram (prog_id);
+ glEnable (GL_DEPTH_TEST);
+
+ glMatrixMode (GL_MODELVIEW);
+ glLoadIdentity ();
+ glTranslatef (0.0, 0.0, translate_z);
+ glRotatef (rotate_x, 1.0, 0.0, 0.0);
+ glRotatef (rotate_y, 0.0, 1.0, 0.0);
+ glColor3f (1.0, 1.0, 1.0);
+
+ glBindBuffer (GL_UNIFORM_BUFFER, buffer_id);
+ glBufferSubData (GL_UNIFORM_BUFFER, offset, 4 * singleSize, &teapot_color);
+
+ glFrontFace (GL_CW);
+ glutSolidTeapot (0.6);
+ glFrontFace (GL_CCW);
+ glutSwapBuffers ();
+ glutPostRedisplay ();
+
+ teapot_color += delta;
+
+ if (teapot_color > 1.0)
+ {
+ delta = -0.01;
+ }
+
+ if (teapot_color < 0.0)
+ {
+ delta = +0.01;
+ }
+
+}
+
+static void
+mouse (int button, int state, int x, int y)
+{
+ if (state == GLUT_DOWN)
+ {
+ mouse_buttons |= 1 << button;
+ }
+ else if (state == GLUT_UP)
+ {
+ mouse_buttons = 0;
+ }
+
+ mouse_old_x = x;
+ mouse_old_y = y;
+ glutPostRedisplay ();
+}
+
+static void
+motion (int x, int y)
+{
+ float dx, dy;
+ dx = x - mouse_old_x;
+ dy = y - mouse_old_y;
+
+ if (mouse_buttons & 1)
+ {
+ rotate_x += dy * 0.2;
+ rotate_y += dx * 0.2;
+ }
+ else if (mouse_buttons & 4)
+ {
+ translate_z += dy * 0.01;
+ }
+
+ mouse_old_x = x;
+ mouse_old_y = y;
+}
+
+int
+main (int argc, char **argv)
+{
+ glutInit (&argc, argv);
+ glutInitWindowSize (400, 400);
+ glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
+ glutCreateWindow ("UBO Example");
+
+ glutDisplayFunc (render);
+ glutMouseFunc (mouse);
+ glutMotionFunc (motion);
+ glewInit ();
+ init_opengl ();
+ glutMainLoop ();
+ return 0;
+}
diff --git a/src/glsl/blinking-teapot.frag b/src/glsl/blinking-teapot.frag
new file mode 100644
index 0000000..0db060b
--- /dev/null
+++ b/src/glsl/blinking-teapot.frag
@@ -0,0 +1,31 @@
+#extension GL_ARB_uniform_buffer_object : enable
+
+layout(std140) uniform colors0
+{
+ float DiffuseCool;
+ float DiffuseWarm;
+ vec3 SurfaceColor;
+ vec3 WarmColor;
+ vec3 CoolColor;
+ vec4 some[8];
+};
+
+varying float NdotL;
+varying vec3 ReflectVec;
+varying vec3 ViewVec;
+
+void main (void)
+{
+
+ vec3 kcool = min(CoolColor + DiffuseCool * SurfaceColor, 1.0);
+ vec3 kwarm = min(WarmColor + DiffuseWarm * SurfaceColor, 1.0);
+ vec3 kfinal = mix(kcool, kwarm, NdotL);
+
+ vec3 nreflect = normalize(ReflectVec);
+ vec3 nview = normalize(ViewVec);
+
+ float spec = max(dot(nreflect, nview), 0.0);
+ spec = pow(spec, 32.0);
+
+ gl_FragColor = vec4 (min(kfinal + spec, 1.0), 1.0);
+}
diff --git a/src/glsl/blinking-teapot.vert b/src/glsl/blinking-teapot.vert
new file mode 100644
index 0000000..397d733
--- /dev/null
+++ b/src/glsl/blinking-teapot.vert
@@ -0,0 +1,16 @@
+vec3 LightPosition = vec3(0.0, 10.0, 4.0);
+
+varying float NdotL;
+varying vec3 ReflectVec;
+varying vec3 ViewVec;
+
+void main(void)
+{
+ vec3 ecPos = vec3 (gl_ModelViewMatrix * gl_Vertex);
+ vec3 tnorm = normalize(gl_NormalMatrix * gl_Normal);
+ vec3 lightVec = normalize(LightPosition - ecPos);
+ ReflectVec = normalize(reflect(-lightVec, tnorm));
+ ViewVec = normalize(-ecPos);
+ NdotL = (dot(lightVec, tnorm) + 1.0) * 0.5;
+ gl_Position = ftransform();
+}
--
1.7.7
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