mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-12-29 15:01:23 +00:00
527 lines
15 KiB
C
527 lines
15 KiB
C
#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#include <epoxy/gl.h>
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#include "gtkshadertoy.h"
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const char *default_image_shader =
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"void mainImage(out vec4 fragColor, in vec2 fragCoord) {\n"
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" // Normalized pixel coordinates (from 0 to 1)\n"
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" vec2 uv = fragCoord/iResolution.xy;\n"
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"\n"
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" // Time varying pixel color\n"
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" vec3 col = 0.5 + 0.5*cos(iTime+uv.xyx+vec3(0,2,4));\n"
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"\n"
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" if (distance(iMouse.xy, fragCoord.xy) <= 10.0) {\n"
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" col = vec3(0.0);\n"
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" }\n"
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"\n"
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" // Output to screen\n"
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" fragColor = vec4(col,1.0);\n"
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"}\n";
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const char *shadertoy_vertex_shader =
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"#version 150 core\n"
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"\n"
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"uniform vec3 iResolution;\n"
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"\n"
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"in vec2 position;\n"
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"out vec2 fragCoord;\n"
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"\n"
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"void main() {\n"
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" gl_Position = vec4(position, 0.0, 1.0);\n"
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"\n"
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" // Convert from OpenGL coordinate system (with origin in center\n"
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" // of screen) to Shadertoy/texture coordinate system (with origin\n"
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" // in lower left corner)\n"
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" fragCoord = (gl_Position.xy + vec2(1.0)) / vec2(2.0) * iResolution.xy;\n"
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"}\n";
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const char *fragment_prefix =
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"#version 150 core\n"
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"\n"
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"uniform vec3 iResolution; // viewport resolution (in pixels)\n"
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"uniform float iTime; // shader playback time (in seconds)\n"
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"uniform float iTimeDelta; // render time (in seconds)\n"
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"uniform int iFrame; // shader playback frame\n"
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"uniform float iChannelTime[4]; // channel playback time (in seconds)\n"
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"uniform vec3 iChannelResolution[4]; // channel resolution (in pixels)\n"
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"uniform vec4 iMouse; // mouse pixel coords. xy: current (if MLB down), zw: click\n"
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"uniform sampler2D iChannel0;\n"
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"uniform sampler2D iChannel1;\n"
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"uniform sampler2D iChannel2;\n"
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"uniform sampler2D iChannel3;\n"
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"uniform vec4 iDate; // (year, month, day, time in seconds)\n"
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"uniform float iSampleRate; // sound sample rate (i.e., 44100)\n"
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"\n"
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"in vec2 fragCoord;\n"
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"out vec4 vFragColor;\n";
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// Fragment shader suffix
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const char *fragment_suffix =
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" void main() {\n"
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" vec4 c;\n"
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" mainImage(c, fragCoord);\n"
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" vFragColor = c;\n"
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" }\n";
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typedef struct {
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char *image_shader;
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gboolean image_shader_dirty;
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gboolean error_set;
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/* Vertex buffers */
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GLuint vao;
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GLuint buffer;
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/* Active program */
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GLuint program;
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/* Location of uniforms for program */
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GLuint resolution_location;
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GLuint time_location;
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GLuint timedelta_location;
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GLuint frame_location;
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GLuint mouse_location;
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/* Current uniform values */
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float resolution[3];
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float time;
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float timedelta;
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float mouse[4];
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int frame;
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/* Animation data */
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gint64 first_frame_time;
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gint64 first_frame;
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guint tick;
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} GtkShadertoyPrivate;
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G_DEFINE_TYPE_WITH_PRIVATE (GtkShadertoy, gtk_shadertoy, GTK_TYPE_GL_AREA)
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static gboolean gtk_shadertoy_render (GtkGLArea *area,
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GdkGLContext *context);
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static void gtk_shadertoy_reshape (GtkGLArea *area,
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int width,
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int height);
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static void gtk_shadertoy_realize (GtkWidget *widget);
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static void gtk_shadertoy_unrealize (GtkWidget *widget);
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static gboolean gtk_shadertoy_tick (GtkWidget *widget,
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GdkFrameClock *frame_clock,
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gpointer user_data);
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GtkWidget *
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gtk_shadertoy_new (void)
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{
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return g_object_new (gtk_shadertoy_get_type (), NULL);
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}
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static void
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drag_begin_cb (GtkGestureDrag *drag,
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double x,
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double y,
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gpointer user_data)
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{
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GtkShadertoy *shadertoy = GTK_SHADERTOY (user_data);
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
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int height = gtk_widget_get_height (GTK_WIDGET (shadertoy));
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int scale = gtk_widget_get_scale_factor (GTK_WIDGET (shadertoy));
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priv->mouse[0] = x * scale;
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priv->mouse[1] = (height - y) * scale;
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priv->mouse[2] = priv->mouse[0];
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priv->mouse[3] = priv->mouse[1];
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}
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static void
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drag_update_cb (GtkGestureDrag *drag,
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double dx,
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double dy,
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gpointer user_data)
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{
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GtkShadertoy *shadertoy = GTK_SHADERTOY (user_data);
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
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int width = gtk_widget_get_width (GTK_WIDGET (shadertoy));
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int height = gtk_widget_get_height (GTK_WIDGET (shadertoy));
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int scale = gtk_widget_get_scale_factor (GTK_WIDGET (shadertoy));
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double x, y;
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gtk_gesture_drag_get_start_point (drag, &x, &y);
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x += dx;
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y += dy;
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if (x >= 0 && x < width &&
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y >= 0 && y < height)
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{
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priv->mouse[0] = x * scale;
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priv->mouse[1] = (height - y) * scale;
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}
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}
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static void
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drag_end_cb (GtkGestureDrag *drag,
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gdouble dx,
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gdouble dy,
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gpointer user_data)
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{
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GtkShadertoy *shadertoy = GTK_SHADERTOY (user_data);
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
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priv->mouse[2] = -priv->mouse[2];
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priv->mouse[3] = -priv->mouse[3];
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}
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static void
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gtk_shadertoy_init (GtkShadertoy *shadertoy)
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{
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
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GtkGesture *drag;
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priv->image_shader = g_strdup (default_image_shader);
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priv->tick = gtk_widget_add_tick_callback (GTK_WIDGET (shadertoy), gtk_shadertoy_tick, shadertoy, NULL);
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drag = gtk_gesture_drag_new ();
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gtk_widget_add_controller (GTK_WIDGET (shadertoy), GTK_EVENT_CONTROLLER (drag));
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g_signal_connect (drag, "drag-begin", (GCallback)drag_begin_cb, shadertoy);
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g_signal_connect (drag, "drag-update", (GCallback)drag_update_cb, shadertoy);
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g_signal_connect (drag, "drag-end", (GCallback)drag_end_cb, shadertoy);
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}
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static void
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gtk_shadertoy_finalize (GObject *obj)
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{
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GtkShadertoy *shadertoy = GTK_SHADERTOY (obj);
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
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gtk_widget_remove_tick_callback (GTK_WIDGET (shadertoy), priv->tick);
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g_free (priv->image_shader);
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G_OBJECT_CLASS (gtk_shadertoy_parent_class)->finalize (obj);
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}
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static void
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gtk_shadertoy_class_init (GtkShadertoyClass *klass)
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{
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GTK_GL_AREA_CLASS (klass)->render = gtk_shadertoy_render;
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GTK_GL_AREA_CLASS (klass)->resize = gtk_shadertoy_reshape;
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GTK_WIDGET_CLASS (klass)->realize = gtk_shadertoy_realize;
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GTK_WIDGET_CLASS (klass)->unrealize = gtk_shadertoy_unrealize;
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G_OBJECT_CLASS (klass)->finalize = gtk_shadertoy_finalize;
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}
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/* new window size or exposure */
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static void
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gtk_shadertoy_reshape (GtkGLArea *area, int width, int height)
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{
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private ((GtkShadertoy *) area);
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priv->resolution[0] = width;
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priv->resolution[1] = height;
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priv->resolution[2] = 1.0; /* screen aspect ratio */
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/* Set the viewport */
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glViewport (0, 0, (GLint) width, (GLint) height);
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}
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static GLuint
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create_shader (int type,
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const char *src,
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GError **error)
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{
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GLuint shader;
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int status;
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shader = glCreateShader (type);
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glShaderSource (shader, 1, &src, NULL);
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glCompileShader (shader);
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glGetShaderiv (shader, GL_COMPILE_STATUS, &status);
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if (status == GL_FALSE)
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{
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int log_len;
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char *buffer;
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glGetShaderiv (shader, GL_INFO_LOG_LENGTH, &log_len);
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buffer = g_malloc (log_len + 1);
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glGetShaderInfoLog (shader, log_len, NULL, buffer);
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g_set_error (error, GDK_GL_ERROR, GDK_GL_ERROR_COMPILATION_FAILED,
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"Compile failure in %s shader:\n%s",
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type == GL_VERTEX_SHADER ? "vertex" : "fragment",
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buffer);
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g_free (buffer);
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glDeleteShader (shader);
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return 0;
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}
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return shader;
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}
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static gboolean
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init_shaders (GtkShadertoy *shadertoy,
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const char *vertex_source,
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const char *fragment_source,
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GError **error)
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{
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
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GLuint vertex, fragment;
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GLuint program = 0;
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int status;
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gboolean res = TRUE;
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vertex = create_shader (GL_VERTEX_SHADER, vertex_source, error);
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if (vertex == 0)
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return FALSE;
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fragment = create_shader (GL_FRAGMENT_SHADER, fragment_source, error);
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if (fragment == 0)
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{
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glDeleteShader (vertex);
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return FALSE;
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}
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program = glCreateProgram ();
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glAttachShader (program, vertex);
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glAttachShader (program, fragment);
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glLinkProgram (program);
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glGetProgramiv (program, GL_LINK_STATUS, &status);
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if (status == GL_FALSE)
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{
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int log_len;
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char *buffer;
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glGetProgramiv (program, GL_INFO_LOG_LENGTH, &log_len);
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buffer = g_malloc (log_len + 1);
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glGetProgramInfoLog (program, log_len, NULL, buffer);
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g_set_error (error, GDK_GL_ERROR, GDK_GL_ERROR_LINK_FAILED,
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"Linking failure:\n%s", buffer);
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res = FALSE;
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g_free (buffer);
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glDeleteProgram (program);
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goto out;
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}
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if (priv->program != 0)
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glDeleteProgram (priv->program);
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priv->program = program;
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priv->resolution_location = glGetUniformLocation (program, "iResolution");
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priv->time_location = glGetUniformLocation (program, "iTime");
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priv->timedelta_location = glGetUniformLocation (program, "iTimeDelta");
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priv->frame_location = glGetUniformLocation (program, "iFrame");
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priv->mouse_location = glGetUniformLocation (program, "iMouse");
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glDetachShader (program, vertex);
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glDetachShader (program, fragment);
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out:
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/* These are now owned by the program and can be deleted */
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glDeleteShader (vertex);
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glDeleteShader (fragment);
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return res;
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}
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static void
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gtk_shadertoy_realize_shader (GtkShadertoy *shadertoy)
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{
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
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char *fragment_shader;
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GError *error = NULL;
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fragment_shader = g_strconcat (fragment_prefix, priv->image_shader, fragment_suffix, NULL);
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if (!init_shaders (shadertoy, shadertoy_vertex_shader, fragment_shader, &error))
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{
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priv->error_set = TRUE;
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gtk_gl_area_set_error (GTK_GL_AREA (shadertoy), error);
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g_error_free (error);
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}
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g_free (fragment_shader);
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/* Start new shader at time zero */
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priv->first_frame_time = 0;
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priv->first_frame = 0;
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priv->image_shader_dirty = FALSE;
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}
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static gboolean
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gtk_shadertoy_render (GtkGLArea *area,
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GdkGLContext *context)
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{
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GtkShadertoy *shadertoy = GTK_SHADERTOY (area);
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
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if (gtk_gl_area_get_error (area) != NULL)
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return FALSE;
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if (priv->image_shader_dirty)
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gtk_shadertoy_realize_shader (shadertoy);
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/* Clear the viewport */
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glClearColor (0.0, 0.0, 0.0, 1.0);
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glClear (GL_COLOR_BUFFER_BIT);
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glUseProgram (priv->program);
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/* Update uniforms */
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if (priv->resolution_location != -1)
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glUniform3fv (priv->resolution_location, 1, priv->resolution);
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if (priv->time_location != -1)
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glUniform1f (priv->time_location, priv->time);
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if (priv->timedelta_location != -1)
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glUniform1f (priv->timedelta_location, priv->timedelta);
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if (priv->frame_location != -1)
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glUniform1i (priv->frame_location, priv->frame);
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if (priv->mouse_location != -1)
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glUniform4fv (priv->mouse_location, 1, priv->mouse);
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/* Use the vertices in our buffer */
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glBindBuffer (GL_ARRAY_BUFFER, priv->buffer);
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glEnableVertexAttribArray (0);
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glVertexAttribPointer (0, 4, GL_FLOAT, GL_FALSE, 0, 0);
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glDrawArrays (GL_TRIANGLES, 0, 6);
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/* We finished using the buffers and program */
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glDisableVertexAttribArray (0);
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glBindBuffer (GL_ARRAY_BUFFER, 0);
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glUseProgram (0);
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/* Flush the contents of the pipeline */
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glFlush ();
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return TRUE;
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}
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const char *
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gtk_shadertoy_get_image_shader (GtkShadertoy *shadertoy)
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{
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
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return priv->image_shader;
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}
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void
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gtk_shadertoy_set_image_shader (GtkShadertoy *shadertoy,
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const char *shader)
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{
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
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g_free (priv->image_shader);
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priv->image_shader = g_strdup (shader);
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/* Don't override error we didn't set it ourselves */
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if (priv->error_set)
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{
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gtk_gl_area_set_error (GTK_GL_AREA (shadertoy), NULL);
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priv->error_set = FALSE;
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}
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priv->image_shader_dirty = TRUE;
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}
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static void
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gtk_shadertoy_realize (GtkWidget *widget)
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{
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GtkGLArea *glarea = GTK_GL_AREA (widget);
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GtkShadertoy *shadertoy = GTK_SHADERTOY (widget);
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
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/* Draw two triangles across whole screen */
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const GLfloat vertex_data[] = {
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-1.0f, -1.0f, 0.f, 1.f,
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-1.0f, 1.0f, 0.f, 1.f,
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1.0f, 1.0f, 0.f, 1.f,
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-1.0f, -1.0f, 0.f, 1.f,
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1.0f, 1.0f, 0.f, 1.f,
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1.0f, -1.0f, 0.f, 1.f,
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};
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GTK_WIDGET_CLASS (gtk_shadertoy_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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glGenVertexArrays (1, &priv->vao);
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glBindVertexArray (priv->vao);
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glGenBuffers (1, &priv->buffer);
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glBindBuffer (GL_ARRAY_BUFFER, priv->buffer);
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glBufferData (GL_ARRAY_BUFFER, sizeof (vertex_data), vertex_data, GL_STATIC_DRAW);
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glBindBuffer (GL_ARRAY_BUFFER, 0);
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gtk_shadertoy_realize_shader (shadertoy);
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}
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static void
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gtk_shadertoy_unrealize (GtkWidget *widget)
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{
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GtkGLArea *glarea = GTK_GL_AREA (widget);
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GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private ((GtkShadertoy *) 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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{
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if (priv->buffer != 0)
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glDeleteBuffers (1, &priv->buffer);
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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);
|
|
}
|
|
|
|
GTK_WIDGET_CLASS (gtk_shadertoy_parent_class)->unrealize (widget);
|
|
}
|
|
|
|
static gboolean
|
|
gtk_shadertoy_tick (GtkWidget *widget,
|
|
GdkFrameClock *frame_clock,
|
|
gpointer user_data)
|
|
{
|
|
GtkShadertoy *shadertoy = GTK_SHADERTOY (widget);
|
|
GtkShadertoyPrivate *priv = gtk_shadertoy_get_instance_private (shadertoy);
|
|
gint64 frame_time;
|
|
gint64 frame;
|
|
float previous_time;
|
|
|
|
frame = gdk_frame_clock_get_frame_counter (frame_clock);
|
|
frame_time = gdk_frame_clock_get_frame_time (frame_clock);
|
|
|
|
if (priv->first_frame_time == 0)
|
|
{
|
|
priv->first_frame_time = frame_time;
|
|
priv->first_frame = frame;
|
|
previous_time = 0;
|
|
}
|
|
else
|
|
previous_time = priv->time;
|
|
|
|
priv->time = (frame_time - priv->first_frame_time) / 1000000.0f;
|
|
priv->frame = frame - priv->first_frame;
|
|
priv->timedelta = priv->time - previous_time;
|
|
|
|
gtk_widget_queue_draw (widget);
|
|
|
|
return G_SOURCE_CONTINUE;
|
|
}
|