From ca305d70ea5c774ee04a6205682e1cd9e2bce003 Mon Sep 17 00:00:00 2001
From: Sergio Valor <jaildesigner@gmail.com>
Date: Sun, 23 Mar 2025 19:06:25 +0100
Subject: [PATCH] primer commit

---
 .gitignore             | 36 ++++++++++++++++++++++++
 CMakeLists.txt         | 39 +++++++++++++++++++++++++
 Makefile               | 34 ++++++++++++++++++++++
 README.md              |  3 ++
 demo2_pixels_noise.cpp | 64 ++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 176 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 CMakeLists.txt
 create mode 100644 Makefile
 create mode 100644 README.md
 create mode 100644 demo2_pixels_noise.cpp

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c248bb8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,36 @@
+build/
+
+# ---> C++
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..fab36bf
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,39 @@
+cmake_minimum_required(VERSION 3.20)
+project(demo2_pixels_noise)
+
+# Establecer el estándar de C++
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# Definir las fuentes y el ejecutable
+set(SOURCE demo2_pixels_noise.cpp)
+set(EXECUTABLE demo2_pixels_noise)
+
+# Buscar SDL3 automáticamente
+find_package(SDL3 REQUIRED)
+include_directories(${SDL3_INCLUDE_DIRS})
+link_directories(${SDL3_LIBRARY_DIRS})
+
+# Detectar la plataforma y ajustar configuraciones específicas
+if(WIN32)
+    set(PLATFORM windows)
+    set(LDFLAGS "-lmingw32 -lws2_32 ${SDL3_LIBRARIES}")
+    set(EXE_EXT ".exe")
+elseif(UNIX AND NOT APPLE)
+    set(PLATFORM linux)
+    set(EXE_EXT ".out")
+    set(LDFLAGS "${SDL3_LIBRARIES}")
+elseif(APPLE)
+    set(PLATFORM macos)
+    set(EXE_EXT ".out")
+    set(LDFLAGS "${SDL3_LIBRARIES}")
+endif()
+
+# Añadir el ejecutable
+add_executable(${EXECUTABLE}${EXE_EXT} ${SOURCE})
+
+# Enlazar las bibliotecas
+target_link_libraries(${EXECUTABLE}${EXE_EXT} ${LDFLAGS})
+
+# Colocar el ejecutable en la raíz del proyecto
+set_target_properties(${EXECUTABLE}${EXE_EXT} PROPERTIES RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR})
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..c0b7481
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,34 @@
+# Makefile sin espacios adicionales y con sintaxis minimalista
+CXXFLAGS:=-std=c++20 -Wall -Os -ffunction-sections -fdata-sections
+LDFLAGS:=-lSDL3
+SOURCE:=demo2_pixels_noise.cpp
+EXECUTABLE:=demo2_pixels_noise
+RM:=rm -f
+
+# Detectar plataforma
+ifeq ($(OS),Windows_NT)
+	PLATFORM:=windows
+	LDFLAGS+=-lmingw32 -lws2_32
+	EXE_EXT:=.exe
+else
+	UNAME_S:=$(shell uname -s)
+ifeq ($(UNAME_S),Linux)
+	PLATFORM:=linux
+	EXE_EXT:=.out
+endif
+ifeq ($(UNAME_S),Darwin)
+	PLATFORM:=macos
+	EXE_EXT:=.out
+endif
+endif
+
+# Regla principal
+all: $(EXECUTABLE)
+
+# Compilar
+$(EXECUTABLE):
+	$(CXX) $(SOURCE) $(CXXFLAGS) $(LDFLAGS) -o $(EXECUTABLE)$(EXE_EXT)
+
+# Limpiar
+clean:
+	$(RM) $(EXECUTABLE)*
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b0bb0ea
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# demo2_pixels_noise
+
+Demo rapideta de pintat de pixels en SDL
\ No newline at end of file
diff --git a/demo2_pixels_noise.cpp b/demo2_pixels_noise.cpp
new file mode 100644
index 0000000..a8c993d
--- /dev/null
+++ b/demo2_pixels_noise.cpp
@@ -0,0 +1,64 @@
+#include <SDL3/SDL.h>
+#include <cstdlib>
+#include <ctime>
+
+struct ARGB
+{
+    Uint8 b, g, r, a;
+
+    // Constructor
+    ARGB(Uint8 blue = 0, Uint8 green = 0, Uint8 red = 0, Uint8 alpha = 255)
+        : b(blue), g(green), r(red), a(alpha) {}
+};
+
+int main(int argc, char *argv[])
+{
+    constexpr int WIDTH = 320;
+    constexpr int HEIGHT = 240;
+    constexpr int ZOOM = 2;
+
+    srand(static_cast<unsigned>(time(nullptr)));
+
+    SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
+
+    SDL_Window *window = SDL_CreateWindow("pixels_white_noise", WIDTH * ZOOM, HEIGHT * ZOOM, SDL_WINDOW_OPENGL);
+    SDL_Renderer *renderer = SDL_CreateRenderer(window, nullptr);
+    SDL_SetRenderLogicalPresentation(renderer, WIDTH, HEIGHT, SDL_LOGICAL_PRESENTATION_INTEGER_SCALE);
+    SDL_Texture *texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, WIDTH, HEIGHT);
+
+    ARGB *pixels;
+    int pitch;
+
+    SDL_Event sdlEvent;
+    bool exit = false;
+    while (!exit)
+    {
+        while (SDL_PollEvent(&sdlEvent))
+        {
+            if (sdlEvent.type == SDL_EVENT_QUIT)
+            {
+                exit = true;
+                break;
+            }
+        }
+
+        SDL_LockTexture(texture, nullptr, (void **)&pixels, &pitch);
+
+        for (int i = 0; i < 76800; ++i)
+        {
+            pixels[i] = ARGB(rand() % 256, rand() % 256, rand() % 256, 255);
+        }
+
+        SDL_UnlockTexture(texture);
+        SDL_RenderTexture(renderer, texture, nullptr, nullptr);
+        SDL_RenderPresent(renderer);
+    }
+
+    SDL_DestroyTexture(texture);
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyWindow(window);
+
+    SDL_Quit();
+
+    return 0;
+}