forked from AuroraMiddleware/gtk
tests/gears: Ensure we don't use unavailable GL resources
We need to check on realize if we have access to a GL context, before calling GL functions. We use gtk_gl_area_get_error() for that. We also need to tear down the resources during unrealization, instead of leaking them.
This commit is contained in:
Emmanuele Bassi
parent
a39b8f67ba
commit
b274a2656d
122
tests/gtkgears.c
122
tests/gtkgears.c
@ -83,19 +83,26 @@ struct gear {
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struct vertex_strip *strips;
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/** The number of triangle strips comprising the gear */
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int nstrips;
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/** The Vertex Buffer Object holding the vertices in the graphics card */
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GLuint vbo;
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};
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typedef struct {
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/* The view rotation [x, y, z] */
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GLfloat view_rot[GTK_GEARS_N_AXIS];
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/* The Vertex Array Object */
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GLuint vao;
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/* The shader program */
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GLuint program;
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/* The gears */
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struct gear *gear1;
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struct gear *gear2;
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struct gear *gear3;
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/** The Vertex Buffer Object holding the vertices in the graphics card */
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GLuint gear_vbo[3];
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/** The location of the shader uniforms */
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GLuint ModelViewProjectionMatrix_location;
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GLuint NormalMatrix_location;
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@ -120,9 +127,11 @@ G_DEFINE_TYPE_WITH_PRIVATE (GtkGears, gtk_gears, GTK_TYPE_GL_AREA)
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static gboolean gtk_gears_render (GtkGLArea *area,
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GdkGLContext *context);
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static void gtk_gears_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation);
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static void gtk_gears_reshape (GtkGLArea *area,
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int width,
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int height);
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static void gtk_gears_realize (GtkWidget *widget);
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static void gtk_gears_unrealize (GtkWidget *widget);
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static gboolean gtk_gears_tick (GtkWidget *widget,
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GdkFrameClock *frame_clock,
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gpointer user_data);
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@ -175,8 +184,11 @@ static void
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gtk_gears_class_init (GtkGearsClass *klass)
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{
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GTK_GL_AREA_CLASS (klass)->render = gtk_gears_render;
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GTK_GL_AREA_CLASS (klass)->resize = gtk_gears_reshape;
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GTK_WIDGET_CLASS (klass)->realize = gtk_gears_realize;
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GTK_WIDGET_CLASS (klass)->size_allocate = gtk_gears_size_allocate;
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GTK_WIDGET_CLASS (klass)->unrealize = gtk_gears_unrealize;
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G_OBJECT_CLASS (klass)->finalize = gtk_gears_finalize;
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}
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@ -211,7 +223,7 @@ vert (GearVertex *v,
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static void
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destroy_gear (struct gear *g)
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{
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g_clear_pointer (&g->strips, g_free);
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g_free (g->strips);
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g_free (g);
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}
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@ -358,14 +370,6 @@ create_gear (GLfloat inner_radius,
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gear->nvertices = (v - gear->vertices);
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/* Store the vertices in a vertex buffer object (VBO) */
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glGenBuffers (1, &gear->vbo);
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glBindBuffer (GL_ARRAY_BUFFER, gear->vbo);
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glBufferData (GL_ARRAY_BUFFER,
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gear->nvertices * sizeof(GearVertex),
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gear->vertices,
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GL_STATIC_DRAW);
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return gear;
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}
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@ -546,6 +550,7 @@ void perspective(GLfloat *m, GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloa
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static void
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draw_gear(GtkGears *self,
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struct gear *gear,
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GLuint gear_vbo,
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GLfloat *transform,
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GLfloat x,
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GLfloat y,
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@ -583,7 +588,7 @@ draw_gear(GtkGears *self,
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glUniform4fv(priv->MaterialColor_location, 1, color);
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/* Set the vertex buffer object to use */
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glBindBuffer(GL_ARRAY_BUFFER, gear->vbo);
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glBindBuffer(GL_ARRAY_BUFFER, gear_vbo);
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/* Set up the position of the attributes in the vertex buffer object */
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), NULL);
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@ -605,9 +610,9 @@ draw_gear(GtkGears *self,
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/* new window size or exposure */
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static void
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reshape(GtkGears *gears, int width, int height)
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gtk_gears_reshape (GtkGLArea *area, int width, int height)
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{
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GtkGearsPrivate *priv = gtk_gears_get_instance_private (gears);
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GtkGearsPrivate *priv = gtk_gears_get_instance_private ((GtkGears *) area);
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/* Update the projection matrix */
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perspective (priv->ProjectionMatrix, 60.0, width / (float)height, 1.0, 1024.0);
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@ -640,28 +645,13 @@ gtk_gears_render (GtkGLArea *area,
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rotate (transform, 2 * G_PI * priv->view_rot[2] / 360.0, 0, 0, 1);
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/* Draw the gears */
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draw_gear (self, priv->gear1, transform, -3.0, -2.0, priv->angle, red);
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draw_gear (self, priv->gear2, transform, 3.1, -2.0, -2 * priv->angle - 9.0, green);
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draw_gear (self, priv->gear3, transform, -3.1, 4.2, -2 * priv->angle - 25.0, blue);
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draw_gear (self, priv->gear1, priv->gear_vbo[0], transform, -3.0, -2.0, priv->angle, red);
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draw_gear (self, priv->gear2, priv->gear_vbo[1], transform, 3.1, -2.0, -2 * priv->angle - 9.0, green);
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draw_gear (self, priv->gear3, priv->gear_vbo[2], transform, -3.1, 4.2, -2 * priv->angle - 25.0, blue);
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return TRUE;
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}
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static void
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gtk_gears_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation)
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{
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GtkGLArea *glarea = GTK_GL_AREA (widget);
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GTK_WIDGET_CLASS (gtk_gears_parent_class)->size_allocate (widget, allocation);
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if (gtk_widget_get_realized (widget))
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{
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gtk_gl_area_make_current (glarea);
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reshape ((GtkGears *) glarea, allocation->width, allocation->height);
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}
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}
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static const char vertex_shader[] =
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"#version 150\n"
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"\n"
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@ -715,6 +705,8 @@ gtk_gears_realize (GtkWidget *widget)
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GTK_WIDGET_CLASS (gtk_gears_parent_class)->realize (widget);
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gtk_gl_area_make_current (glarea);
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if (gtk_gl_area_get_error (glarea) != NULL)
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return;
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glEnable (GL_CULL_FACE);
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glEnable (GL_DEPTH_TEST);
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@ -722,6 +714,7 @@ gtk_gears_realize (GtkWidget *widget)
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/* Create the VAO */
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glGenVertexArrays (1, &vao);
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glBindVertexArray (vao);
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priv->vao = vao;
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/* Compile the vertex shader */
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p = vertex_shader;
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@ -749,9 +742,12 @@ gtk_gears_realize (GtkWidget *widget)
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glLinkProgram(program);
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glGetProgramInfoLog(program, sizeof msg, NULL, msg);
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g_print ("program info: %s\n", msg);
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glDeleteShader (v);
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glDeleteShader (f);
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/* Enable the shaders */
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glUseProgram(program);
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priv->program = program;
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/* Get the locations of the uniforms so we can access them */
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priv->ModelViewProjectionMatrix_location = glGetUniformLocation(program, "ModelViewProjectionMatrix");
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@ -764,8 +760,64 @@ gtk_gears_realize (GtkWidget *widget)
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/* make the gears */
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priv->gear1 = create_gear(1.0, 4.0, 1.0, 20, 0.7);
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/* Store the vertices in a vertex buffer object (VBO) */
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glGenBuffers (1, &(priv->gear_vbo[0]));
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glBindBuffer (GL_ARRAY_BUFFER, priv->gear_vbo[0]);
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glBufferData (GL_ARRAY_BUFFER,
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priv->gear1->nvertices * sizeof(GearVertex),
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priv->gear1->vertices,
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GL_STATIC_DRAW);
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priv->gear2 = create_gear(0.5, 2.0, 2.0, 10, 0.7);
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glGenBuffers (1, &(priv->gear_vbo[1]));
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glBindBuffer (GL_ARRAY_BUFFER, priv->gear_vbo[1]);
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glBufferData (GL_ARRAY_BUFFER,
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priv->gear2->nvertices * sizeof(GearVertex),
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priv->gear2->vertices,
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GL_STATIC_DRAW);
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priv->gear3 = create_gear(1.3, 2.0, 0.5, 10, 0.7);
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glGenBuffers (1, &(priv->gear_vbo[2]));
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glBindBuffer (GL_ARRAY_BUFFER, priv->gear_vbo[2]);
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glBufferData (GL_ARRAY_BUFFER,
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priv->gear3->nvertices * sizeof(GearVertex),
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priv->gear3->vertices,
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GL_STATIC_DRAW);
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}
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static void
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gtk_gears_unrealize (GtkWidget *widget)
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{
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GtkGLArea *glarea = GTK_GL_AREA (widget);
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GtkGearsPrivate *priv = gtk_gears_get_instance_private ((GtkGears *) widget);
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gtk_gl_area_make_current (glarea);
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if (gtk_gl_area_get_error (glarea) != NULL)
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return;
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/* Release the resources associated with OpenGL */
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if (priv->gear_vbo[0] != 0)
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glDeleteBuffers (1, &(priv->gear_vbo[0]));
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if (priv->gear_vbo[1] != 0)
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glDeleteBuffers (1, &(priv->gear_vbo[1]));
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if (priv->gear_vbo[2] != 0)
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glDeleteBuffers (1, &(priv->gear_vbo[2]));
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if (priv->vao != 0)
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glDeleteVertexArrays (1, &priv->vao);
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if (priv->program != 0)
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glDeleteProgram (priv->program);
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priv->ModelViewProjectionMatrix_location = 0;
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priv->NormalMatrix_location = 0;
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priv->LightSourcePosition_location = 0;
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priv->MaterialColor_location = 0;
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GTK_WIDGET_CLASS (gtk_gears_parent_class)->unrealize (widget);
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}
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static gboolean
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