feature (kernel): Implemented a very basic double buffered graphics renderer

kernel/inc/drivers/graphics/color.h

@@ -0,0 +1,28 @@
+/* Copyright (C) Antifallobst <antifallobst@systemausfall.org>
+ *
+ * NoxOS is free software:
+ * you can redistribute it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * NoxOS 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef NOX_COLOR_H
+#define NOX_COLOR_H
+
+#include "utils/stdtypes.h"
+
+typedef struct {
+    uint8_t alpha;
+    uint8_t red;
+    uint8_t green;
+    uint8_t blue;
+} color_argb_T;
+
+#endif //NOX_COLOR_H

kernel/inc/drivers/graphics/framebuffer.h

@@ -0,0 +1,30 @@
+/* Copyright (C) Antifallobst <antifallobst@systemausfall.org>
+ *
+ * NoxOS is free software:
+ * you can redistribute it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * NoxOS 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef NOX_FRAMEBUFFER_H
+#define NOX_FRAMEBUFFER_H
+
+#include "utils/stdtypes.h"
+
+typedef struct {
+    void*       address;
+    uint64_t    width;
+    uint64_t    height;
+    uint64_t    pitch;
+    uint16_t    bits_per_pixel;
+    uint8_t     bytes_per_pixel;
+} framebuffer_T;
+
+#endif //NOX_FRAMEBUFFER_H

kernel/inc/drivers/graphics/renderer.h

@@ -0,0 +1,35 @@
+/* Copyright (C) Antifallobst <antifallobst@systemausfall.org>
+ *
+ * NoxOS is free software:
+ * you can redistribute it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * NoxOS 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef NOX_RENDERER_H
+#define NOX_RENDERER_H
+
+#include "utils/stdtypes.h"
+#include "drivers/graphics/color.h"
+#include "drivers/graphics/framebuffer.h"
+#include "boot/boot_info.h"
+
+typedef struct {
+    framebuffer_T   framebuffer;
+    uint8_t*        back_buffer;
+    uint64_t        buffer_size;
+} graphics_renderer_T;
+
+void            graphics_renderer_set_pixel (uint32_t x, uint32_t y, color_argb_T color);
+color_argb_T    graphics_renderer_get_pixel (uint32_t x, uint32_t y);
+void            graphics_renderer_update    ();
+void            graphics_renderer_init      (boot_info_T* boot_info);
+
+#endif //NOX_RENDERER_H

kernel/src/drivers/graphics/renderer.c

@@ -0,0 +1,59 @@
+/* Copyright (C) Antifallobst <antifallobst@systemausfall.org>
+ *
+ * NoxOS is free software:
+ * you can redistribute it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * NoxOS 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "drivers/graphics/renderer.h"
+#include "utils/memory.h"
+#include "utils/math.h"
+
+graphics_renderer_T g_renderer;
+
+void graphics_renderer_set_pixel(uint32_t x, uint32_t y, color_argb_T color) {
+    uint64_t position = (y * g_renderer.framebuffer.width * g_renderer.framebuffer.bytes_per_pixel) + (x * g_renderer.framebuffer.bytes_per_pixel);
+
+    g_renderer.back_buffer[position]   = color.red;
+    g_renderer.back_buffer[position+1] = color.green;
+    g_renderer.back_buffer[position+2] = color.blue;
+}
+
+color_argb_T graphics_renderer_get_pixel(uint32_t x, uint32_t y) {
+    uint64_t position = (y * g_renderer.framebuffer.width * g_renderer.framebuffer.bytes_per_pixel) + (x * g_renderer.framebuffer.bytes_per_pixel);
+
+    color_argb_T color;
+    color.alpha = 0xFF;
+    color.red   = g_renderer.back_buffer[position];
+    color.green = g_renderer.back_buffer[position+1];
+    color.blue  = g_renderer.back_buffer[position+2];
+
+    return color;
+}
+
+void graphics_renderer_update() {
+    memory_copy(g_renderer.back_buffer, g_renderer.framebuffer.address, g_renderer.buffer_size);
+}
+
+void graphics_renderer_init(boot_info_T* boot_info_T) {
+    struct limine_framebuffer* framebuffer = boot_info_T->framebuffer->framebuffers[0];
+
+    g_renderer.framebuffer.address         = framebuffer->address;
+    g_renderer.framebuffer.width           = framebuffer->width;
+    g_renderer.framebuffer.height          = framebuffer->height;
+    g_renderer.framebuffer.pitch           = framebuffer->pitch;
+    g_renderer.framebuffer.bits_per_pixel  = framebuffer->bpp;
+    g_renderer.framebuffer.bytes_per_pixel = CEIL_TO(framebuffer->bpp, 8) / 8;
+
+    g_renderer.buffer_size = g_renderer.framebuffer.width * g_renderer.framebuffer.height * g_renderer.framebuffer.bytes_per_pixel;
+    g_renderer.back_buffer = memory_allocate(g_renderer.buffer_size);
+    memory_set(g_renderer.back_buffer, 0, g_renderer.buffer_size);
+}

kernel/src/kmain.c

@@ -21,6 +21,7 @@
 #include "mm/page_frame.h"
 #include "mm/page_map.h"
 #include "drivers/time/pit.h"
+#include "drivers/graphics/renderer.h"
 #include "proc/scheduler.h"
 
 #include "utils/io.h"
@@ -41,27 +42,10 @@ void kernel_init(boot_info_T* boot_info) {
 
     paging_init();
     memory_allocator_init((void*)0x100000000000);
+    graphics_renderer_init(boot_info);
     scheduler_init();
 }
 
-void test_a() {
-    while (true) {
-        io_out_byte(LOG_PORT, 'A');
-    }
-}
-
-void test_b() {
-    while (true) {
-        io_out_byte(LOG_PORT, 'B');
-    }
-}
-
-void test_c() {
-    while (true) {
-        io_out_byte(LOG_PORT, 'C');
-    }
-}
-
 void kmain(boot_info_T boot_info) {
 
     limine_terminal_print(&boot_info, "Booting NoxOS...\n");
@@ -72,13 +56,13 @@ void kmain(boot_info_T boot_info) {
     limine_terminal_print(&boot_info, "Kernel initialized\n");
     log(LOG_INFO, "!=====[ Kernel Initialized ]=====!\n");
 
-    thread_T* thread = thread_spawn(test_b);
+    for (int i = 0; i < 500; i++) {
-    thread_start(thread);
+        graphics_renderer_set_pixel(i, i, (color_argb_T){0xFF, 0x00, 0xFF, 0x00});
+    }
+    graphics_renderer_update();
 
-    thread_T* thread1 = thread_spawn(test_c);
+    color_argb_T color = graphics_renderer_get_pixel(0, 0);
-    thread_start(thread1);
+    log(LOG_DEBUG, "ALPHA[0x%xb]  RED[0x%xb]  GREEN[0x%xb]  BLUE[0x%xb]", color.alpha, color.red, color.green, color.blue);
-
-    test_a();
 
     CORE_HALT_FOREVER
 }