359 lines
10 KiB
C
359 lines
10 KiB
C
#include "gb_screen.h"
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#include "config.h"
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#include "util.h"
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#include <stdint.h>
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struct _GbScreen {
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GtkGLArea parent;
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bool use_gl;
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shader_t shader;
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uint32_t *image_buffers[3];
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unsigned char current_buffer;
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unsigned screen_width;
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unsigned screen_height;
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GB_frame_blending_mode_t blending_mode;
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};
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G_DEFINE_TYPE(GbScreen, gb_screen, GTK_TYPE_GL_AREA);
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typedef enum {
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PROP_USE_GL = 1,
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N_PROPERTIES
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} GbScreenProperty;
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static GParamSpec *obj_properties[N_PROPERTIES] = { NULL, };
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static void gb_screen_finalize(GObject *object) {
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GbScreen *self = (GbScreen *) object;
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if (self->image_buffers[0]) g_free(self->image_buffers[0]);
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if (self->image_buffers[1]) g_free(self->image_buffers[1]);
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if (self->image_buffers[2]) g_free(self->image_buffers[2]);
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free_shader(&self->shader);
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free_master_shader();
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G_OBJECT_CLASS(gb_screen_parent_class)->finalize(object);
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}
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static void gb_screen_get_natural_size(GbScreen *self, gint *natural_width, gint *natural_height, double *scale_x_ptr, double *scale_y_ptr) {
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int width = gtk_widget_get_allocated_width(GTK_WIDGET(self));
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int height = gtk_widget_get_allocated_height(GTK_WIDGET(self));
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double scale_x = width / (double)self->screen_width;
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double scale_y = height / (double)self->screen_height;
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if (config.video.use_integer_scaling) {
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scale_x = (unsigned)(scale_x);
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scale_y = (unsigned)(scale_y);
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}
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if (config.video.keep_aspect_ratio) {
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if (scale_x > scale_y) {
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scale_x = scale_y;
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}
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else {
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scale_y = scale_x;
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}
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}
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scale_x = max_double(1.0, scale_x);
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scale_y = max_double(1.0, scale_y);
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if (natural_width) *natural_width = self->screen_width * scale_x;
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if (natural_height) *natural_height = self->screen_height * scale_y;
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if (scale_x_ptr) *scale_x_ptr = scale_x;
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if (scale_y_ptr) *scale_y_ptr = scale_y;
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}
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static gboolean gb_screen_render(GtkGLArea *gl_area, GdkGLContext *context) {
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GbScreen *self = (GbScreen *) gl_area;
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if (!self->use_gl) return true;
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static gint scaled_width, scaled_height;
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static double scale_x, scale_y;
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GtkWidget *widget = GTK_WIDGET(gl_area);
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int width = gtk_widget_get_allocated_width(widget);
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int height = gtk_widget_get_allocated_height(widget);
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gb_screen_get_natural_size(self, &scaled_width, &scaled_height, &scale_x, &scale_y);
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Rect viewport = {
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(width - scaled_width) / 2,
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(height - scaled_height) / 2,
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scaled_width,
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scaled_height
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};
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glViewport(viewport.x, viewport.y, scaled_width, scaled_height);
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uint32_t *pixels = gb_screen_get_current_buffer(self);
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uint32_t *previous = gb_screen_get_previous_buffer(self);
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static void *_pixels = NULL;
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if (pixels) {
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_pixels = pixels;
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}
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glClearColor(0, 0, 0, 1);
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glClear(GL_COLOR_BUFFER_BIT);
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render_bitmap_with_shader(
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&self->shader, _pixels, previous,
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self->screen_width, self->screen_height,
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viewport.x, viewport.y, viewport.width, viewport.height,
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self->blending_mode
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);
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return true;
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}
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static gboolean gb_screen_draw(GtkWidget *widget, cairo_t *cr) {
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GbScreen *self = (GbScreen *) widget;
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if (self->use_gl) {
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return GTK_WIDGET_CLASS(gb_screen_parent_class)->draw(widget, cr);
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}
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static gint scaled_width, scaled_height;
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static double scale_x, scale_y;
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GtkStyleContext *context = gtk_widget_get_style_context(widget);
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int width = gtk_widget_get_allocated_width(widget);
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int height = gtk_widget_get_allocated_height(widget);
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gtk_render_background(context, cr, 0, 0, width, height);
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gtk_render_frame(context, cr, 0, 0, width, height);
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gb_screen_get_natural_size(self, &scaled_width, &scaled_height, &scale_x, &scale_y);
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Rect viewport = {
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(width - scaled_width) / 2,
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(height - scaled_height) / 2,
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scaled_width,
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scaled_height
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};
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cairo_surface_t *surface = cairo_image_surface_create_for_data(
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(unsigned char *) gb_screen_get_current_buffer(self),
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CAIRO_FORMAT_RGB24,
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self->screen_width,
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self->screen_height,
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cairo_format_stride_for_width(CAIRO_FORMAT_RGB24, self->screen_width)
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);
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cairo_translate(cr, viewport.x, viewport.y);
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cairo_scale(cr, scale_x, scale_y);
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cairo_set_source_surface(cr, surface, 0, 0);
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cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_NEAREST);
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cairo_paint(cr);
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cairo_surface_destroy(surface);
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return true;
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}
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static void gb_screen_get_preferred_width(GtkWidget *widget, gint *minimum_width, gint *natural_width) {
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GbScreen *self = (GbScreen *)widget;
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*minimum_width = self->screen_width;
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gb_screen_get_natural_size(self, natural_width, NULL, NULL, NULL);
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}
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static void gb_screen_get_preferred_height(GtkWidget *widget, gint *minimum_height, gint *natural_height) {
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GbScreen *self = (GbScreen *)widget;
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*minimum_height = self->screen_height;
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gb_screen_get_natural_size(self, NULL, natural_height, NULL, NULL);
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}
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static void gb_screen_set_property(GObject *object, guint property_id, const GValue *value, GParamSpec *pspec) {
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GbScreen *self = (GbScreen *) object;
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switch ((GbScreenProperty) property_id) {
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case PROP_USE_GL:
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self->use_gl = g_value_get_boolean(value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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}
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}
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static void gb_screen_get_property(GObject *object, guint property_id, GValue *value, GParamSpec *pspec) {
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GbScreen *self = (GbScreen *) object;
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switch ((GbScreenProperty) property_id) {
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case PROP_USE_GL:
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g_value_set_boolean(value, self->use_gl);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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}
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}
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static void gb_screen_realize(GtkWidget *widget) {
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GbScreen *self = (GbScreen *)widget;
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GtkGLArea *gl_area = GTK_GL_AREA(widget);
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if (self->use_gl) {
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gtk_gl_area_set_required_version(gl_area, 3, 2);
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gtk_gl_area_set_auto_render(gl_area, true);
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gtk_gl_area_set_has_alpha(gl_area, false);
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gtk_gl_area_set_has_depth_buffer(gl_area, false);
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gtk_gl_area_set_has_stencil_buffer(gl_area, false);
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GTK_WIDGET_CLASS(gb_screen_parent_class)->realize(widget);
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GdkGLContext *context = gtk_gl_area_get_context(gl_area);
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if (context) {
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gtk_gl_area_make_current(gl_area);
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int major, minor;
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gdk_gl_context_get_version(context, &major, &minor);
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if (gtk_gl_area_get_error(gl_area) != NULL) {
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goto error;
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}
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g_debug("GL (%d.%d) Context: %p", major, minor, context);
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g_debug("GtkGLArea on %s", glGetString(GL_RENDERER));
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if (config.video.shader == NULL || (!init_shader_with_name(&self->shader, config.video.shader) && !init_shader_with_name(&self->shader, "NearestNeighbor"))) {
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GError *error = g_error_new_literal(g_quark_from_string("sameboy-gl-error"), 1, "Failed to initialize shaders");
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gtk_gl_area_set_error(gl_area, error);
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}
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else {
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return;
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}
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}
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}
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else {
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GTK_WIDGET_CLASS(gb_screen_parent_class)->realize(widget);
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}
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error:
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if (gtk_gl_area_get_error(gl_area) != NULL) {
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g_warning("GtkGLArea: %s", gtk_gl_area_get_error(gl_area)->message);
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}
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self->use_gl = false;
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g_info("Using Cairo for rendering");
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}
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static void gb_screen_constructed(GObject *object) {
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GbScreen *self = (GbScreen *)object;
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// Very ugly workaround for GtkGLArea!
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// When a GtkGLArea is realized and it creates a legacy GL 1.4 context
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// it tries to use GL 2.0 functions to render the window which leads to the application crashing.
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// So we initialize GTK, create a dummy GtkWindow object, attach a `realize` callback and
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// in this callback create a GdkGLContext on this window. But instead of running the GTK main loop
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// we just realize and destroy the dummy window and compare the context’s version in the realize callback.
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self->use_gl = self->use_gl && test_gl_support();
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G_OBJECT_CLASS(gb_screen_parent_class)->constructed(object);
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}
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static void gb_screen_class_init(GbScreenClass *class) {
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obj_properties[PROP_USE_GL] = g_param_spec_boolean(
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"use-gl", "Use OpenGL", "Whether to use OpenGL for rendering.",
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true,
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G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE
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);
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G_OBJECT_CLASS(class)->finalize = gb_screen_finalize;
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G_OBJECT_CLASS(class)->set_property = gb_screen_set_property;
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G_OBJECT_CLASS(class)->get_property = gb_screen_get_property;
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G_OBJECT_CLASS(class)->constructed = gb_screen_constructed;
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GTK_WIDGET_CLASS(class)->draw = gb_screen_draw;
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GTK_WIDGET_CLASS(class)->get_preferred_width = gb_screen_get_preferred_width;
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GTK_WIDGET_CLASS(class)->get_preferred_height = gb_screen_get_preferred_height;
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GTK_WIDGET_CLASS(class)->realize = gb_screen_realize;
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GTK_GL_AREA_CLASS(class)->render = gb_screen_render;
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g_object_class_install_properties(G_OBJECT_CLASS(class), N_PROPERTIES, obj_properties);
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}
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static void gb_screen_init(GbScreen *self) {
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gb_screen_set_resolution(self, 160, 144);
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gb_screen_clear(self);
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}
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GbScreen *gb_screen_new(bool force_fallback) {
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g_debug("force_fallback: %d", force_fallback);
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return g_object_new(GB_SCREEN_TYPE, "use-gl", !force_fallback, NULL);
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}
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void gb_screen_clear(GbScreen *self) {
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for (unsigned i = 0; i < 3; i++) {
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memset(self->image_buffers[i], 0, self->screen_width * self->screen_height * sizeof(uint32_t));
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}
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}
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bool gb_screen_uses_fallback(GbScreen *self) {
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return !self->use_gl;
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}
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// Determines how many frame buffers to use
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static uint8_t number_of_buffers(GbScreen *self) {
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if (!self->use_gl) return 2;
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bool should_blend = config_get_frame_blending_mode() != GB_FRAME_BLENDING_MODE_DISABLED;
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return should_blend? 3 : 2;
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}
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// Returns the buffer that should be used by the Core to render a new frame to
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uint32_t *gb_screen_get_pixels(GbScreen *self) {
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return self->image_buffers[(self->current_buffer + 1) % number_of_buffers(self)];
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}
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// Returns the current finished frame
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uint32_t *gb_screen_get_current_buffer(GbScreen *self) {
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return self->image_buffers[self->current_buffer];
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}
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// Returns the previous finished frame
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uint32_t *gb_screen_get_previous_buffer(GbScreen *self) {
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return self->image_buffers[(self->current_buffer + 2) % number_of_buffers(self)];
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}
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// Cycles the buffers
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void gb_screen_flip(GbScreen *self) {
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self->current_buffer = (self->current_buffer + 1) % number_of_buffers(self);
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}
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void gb_screen_set_resolution(GbScreen *self, unsigned width, unsigned height) {
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self->screen_width = width;
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self->screen_height = height;
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for (unsigned i = 0; i < 3; i++) {
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self->image_buffers[i] = g_realloc_n(
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self->image_buffers[i],
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self->screen_width * self->screen_height, sizeof(uint32_t)
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);
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}
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gtk_widget_queue_resize(GTK_WIDGET(self));
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}
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void gb_screen_set_blending_mode(GbScreen *self, GB_frame_blending_mode_t mode) {
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self->blending_mode = mode;
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}
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void gb_screen_set_shader(GbScreen *self, const char *shader_name) {
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if (!self->use_gl) return;
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free_shader(&self->shader);
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init_shader_with_name(&self->shader, shader_name);
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}
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