primer commit

.gitignore

@@ -0,0 +1,67 @@
+# Build output
+/build/
+/bin/
+/out/
+/CMakeFiles/
+/CMakeCache.txt
+/cmake_install.cmake
+/Makefile
+/*.cmake
+/*.obj
+/*.o
+/*.lo
+/*.a
+/*.lib
+/*.dll
+/*.so
+/*.dylib
+/*.exe
+/*.pdb
+
+# Generated by CMake/IDE
+/compile_commands.json
+/.ninja* 
+/_deps/
+/install_manifest.txt
+
+# third_party build artifacts (keep sources but ignore local builds)
+third_party/**/build/
+third_party/**/CMakeFiles/
+third_party/**/CMakeCache.txt
+
+# IDEs and editors
+.vscode/
+.idea/
+*.suo
+*.user
+*.userprefs
+*.vcxproj*
+*.sln
+*.xcodeproj/
+*.xcworkspace/
+*.gradle/
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Logs and temporary files
+*.log
+*.tmp
+*.swp
+*~ 
+*.bak
+
+# Coverage and test artifacts
+coverage/
+coverage.info
+*.gcda
+*.gcno
+
+# Python virtual envs (if any)
+venv/
+env/
+__pycache__/
+
+# Avoid committing local SDL runtime if you copy it next to the exe
+SDL3.dll

CMakeLists.txt

@@ -0,0 +1,43 @@
+cmake_minimum_required(VERSION 3.14)
+project(shadertoy_sdl3 LANGUAGES C CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+if(NOT CMAKE_BUILD_TYPE)
+  set(CMAKE_BUILD_TYPE Release)
+endif()
+
+find_package(SDL3 REQUIRED)
+
+# comprobaremos que glad.c existe y lo añadimos
+set(GLAD_SRC "${CMAKE_CURRENT_SOURCE_DIR}/third_party/glad/src/glad.c")
+if(NOT EXISTS "${GLAD_SRC}")
+  message(FATAL_ERROR "glad.c no encontrado en: ${GLAD_SRC}")
+endif()
+
+add_library(glad_src STATIC "${GLAD_SRC}")
+target_include_directories(glad_src PUBLIC
+  ${CMAKE_CURRENT_SOURCE_DIR}/third_party/glad/include
+)
+# forzar el lenguaje de enlace a C para evitar ambigüedades
+set_target_properties(glad_src PROPERTIES LINKER_LANGUAGE C)
+
+add_executable(shadertoy_sdl3
+  src/main.cpp
+)
+
+target_link_libraries(shadertoy_sdl3 PRIVATE glad_src SDL3::SDL3)
+target_include_directories(shadertoy_sdl3 PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/third_party/glad/include)
+
+if (WIN32)
+  target_link_libraries(shadertoy_sdl3 PRIVATE opengl32)
+elseif(APPLE)
+  find_library(COCOA_LIBRARY Cocoa)
+  find_library(IOKIT_LIBRARY IOKit)
+  find_library(CORE_VIDEO_LIBRARY CoreVideo)
+  target_link_libraries(shadertoy_sdl3 PRIVATE ${COCOA_LIBRARY} ${IOKIT_LIBRARY} ${CORE_VIDEO_LIBRARY})
+else()
+  find_package(OpenGL REQUIRED)
+  target_link_libraries(shadertoy_sdl3 PRIVATE OpenGL::GL)
+endif()

src/main.cpp

@@ -0,0 +1,219 @@
+// src/main.cpp
+#include <iostream>
+#include <string>
+#include <SDL3/SDL.h>
+#include <glad/glad.h>
+
+// Vertex shader: genera posiciones de pantalla y una coordenada uv en [0,1]
+static const char *vertexShaderSrc = R"glsl(
+#version 330 core
+layout(location = 0) in vec2 aPos;
+out vec2 vUV;
+void main() {
+    vUV = aPos * 0.5 + 0.5;
+    gl_Position = vec4(aPos, 0.0, 1.0);
+}
+)glsl";
+
+// Fragment shader: adapta tu shader de Shadertoy
+static const char *fragmentShaderSrc = R"glsl(
+#version 330 core
+out vec4 FragColor;
+in vec2 vUV;
+uniform vec2 iResolution;
+uniform float iTime;
+
+vec3 palette( float t) {
+    vec3 a = vec3(1.0, 0.5, 0.5);
+    vec3 b = vec3(1.0, 0.5, 0.5);
+    vec3 c = vec3(1.0, 1.0, 1.0);
+    vec3 d = vec3(0.263, 0.416, 0.557);
+    return a + b * cos( 6.28318 * (c * t * d) );
+}
+
+void mainImage( out vec4 fragColor, in vec2 fragCoord )
+{
+    vec2 uv = (fragCoord * 2.0 - iResolution.xy) / iResolution.y;
+    float d = length(uv);
+    vec3 col = palette(d);
+    d = sin(d * 8.0 + iTime) / 8.0;
+    d = abs(d);
+    d = 0.02 / d;
+    col *= d;
+    fragColor = vec4(col, 1.0);
+}
+
+void main() {
+    vec2 fragCoordPixels = vUV * iResolution;
+    vec4 outColor;
+    mainImage(outColor, fragCoordPixels);
+    FragColor = outColor;
+}
+)glsl";
+
+// helpers
+static GLuint compileShader(GLenum type, const char *src)
+{
+    GLuint s = glCreateShader(type);
+    glShaderSource(s, 1, &src, nullptr);
+    glCompileShader(s);
+    GLint ok = 0;
+    glGetShaderiv(s, GL_COMPILE_STATUS, &ok);
+    if (!ok)
+    {
+        GLint len = 0;
+        glGetShaderiv(s, GL_INFO_LOG_LENGTH, &len);
+        std::string log(len, ' ');
+        glGetShaderInfoLog(s, len, nullptr, &log[0]);
+        std::cerr << "Shader compile error: " << log << '\n';
+        glDeleteShader(s);
+        return 0;
+    }
+    return s;
+}
+
+static GLuint linkProgram(GLuint vs, GLuint fs)
+{
+    GLuint p = glCreateProgram();
+    glAttachShader(p, vs);
+    glAttachShader(p, fs);
+    glLinkProgram(p);
+    GLint ok = 0;
+    glGetProgramiv(p, GL_LINK_STATUS, &ok);
+    if (!ok)
+    {
+        GLint len = 0;
+        glGetProgramiv(p, GL_INFO_LOG_LENGTH, &len);
+        std::string log(len, ' ');
+        glGetProgramInfoLog(p, len, nullptr, &log[0]);
+        std::cerr << "Program link error: " << log << '\n';
+        glDeleteProgram(p);
+        return 0;
+    }
+    return p;
+}
+
+int main(int argc, char **argv)
+{
+    if (!SDL_Init(SDL_INIT_VIDEO))
+    {
+        std::cerr << "SDL_Init error: " << SDL_GetError() << '\n';
+        return -1;
+    }
+
+    // Pedir contexto OpenGL 3.3 Core
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+
+    int winW = 800, winH = 800;
+    // SDL3: SDL_CreateWindow signature es (title, w, h, flags)
+    SDL_Window *window = SDL_CreateWindow("Shadertoy SDL3 + OpenGL",
+                                          winW, winH,
+                                          SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
+    if (!window)
+    {
+        std::cerr << "SDL_CreateWindow error: " << SDL_GetError() << '\n';
+        SDL_Quit();
+        return -1;
+    }
+
+    SDL_GLContext glContext = SDL_GL_CreateContext(window);
+    if (!glContext)
+    {
+        std::cerr << "SDL_GL_CreateContext error: " << SDL_GetError() << '\n';
+        SDL_DestroyWindow(window);
+        SDL_Quit();
+        return -1;
+    }
+
+    if (!gladLoadGLLoader((GLADloadproc)SDL_GL_GetProcAddress))
+    {
+        std::cerr << "Failed to initialize GL loader\n";
+        SDL_GL_DestroyContext(glContext);
+        SDL_DestroyWindow(window);
+        SDL_Quit();
+        return -1;
+    }
+
+    GLuint vs = compileShader(GL_VERTEX_SHADER, vertexShaderSrc);
+    GLuint fs = compileShader(GL_FRAGMENT_SHADER, fragmentShaderSrc);
+    if (!vs || !fs)
+        return -1;
+    GLuint program = linkProgram(vs, fs);
+    glDeleteShader(vs);
+    glDeleteShader(fs);
+    if (!program)
+        return -1;
+
+    float quadVertices[] = {
+        -1.0f,
+        -1.0f,
+        1.0f,
+        -1.0f,
+        -1.0f,
+        1.0f,
+        1.0f,
+        1.0f,
+    };
+
+    GLuint vao = 0, vbo = 0;
+    glGenVertexArrays(1, &vao);
+    glGenBuffers(1, &vbo);
+    glBindVertexArray(vao);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), quadVertices, GL_STATIC_DRAW);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), (void *)0);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
+
+    GLint locRes = glGetUniformLocation(program, "iResolution");
+    GLint locTime = glGetUniformLocation(program, "iTime");
+
+    bool running = true;
+    Uint32 startTicks = SDL_GetTicks();
+
+    while (running)
+    {
+        SDL_Event e;
+        while (SDL_PollEvent(&e))
+        {
+            if (e.type == SDL_EVENT_QUIT)
+                running = false;
+            if (e.type == SDL_EVENT_WINDOW_CLOSE_REQUESTED)
+                running = false;
+        }
+
+        int w, h;
+        SDL_GetWindowSize(window, &w, &h);
+        glViewport(0, 0, w, h);
+        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        glUseProgram(program);
+        if (locRes >= 0)
+            glUniform2f(locRes, float(w), float(h));
+        if (locTime >= 0)
+        {
+            float t = (SDL_GetTicks() - startTicks) / 1000.0f;
+            glUniform1f(locTime, t);
+        }
+
+        glBindVertexArray(vao);
+        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+        glBindVertexArray(0);
+
+        SDL_GL_SwapWindow(window);
+        SDL_Delay(1);
+    }
+
+    glDeleteBuffers(1, &vbo);
+    glDeleteVertexArrays(1, &vao);
+    glDeleteProgram(program);
+
+    SDL_GL_DestroyContext(glContext);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+    return 0;
+}

third_party/glad/include/KHR/khrplatform.h

@@ -0,0 +1,311 @@
+#ifndef __khrplatform_h_
+#define __khrplatform_h_
+
+/*
+** Copyright (c) 2008-2018 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+/* Khronos platform-specific types and definitions.
+ *
+ * The master copy of khrplatform.h is maintained in the Khronos EGL
+ * Registry repository at https://github.com/KhronosGroup/EGL-Registry
+ * The last semantic modification to khrplatform.h was at commit ID:
+ *      67a3e0864c2d75ea5287b9f3d2eb74a745936692
+ *
+ * Adopters may modify this file to suit their platform. Adopters are
+ * encouraged to submit platform specific modifications to the Khronos
+ * group so that they can be included in future versions of this file.
+ * Please submit changes by filing pull requests or issues on
+ * the EGL Registry repository linked above.
+ *
+ *
+ * See the Implementer's Guidelines for information about where this file
+ * should be located on your system and for more details of its use:
+ *    http://www.khronos.org/registry/implementers_guide.pdf
+ *
+ * This file should be included as
+ *        #include <KHR/khrplatform.h>
+ * by Khronos client API header files that use its types and defines.
+ *
+ * The types in khrplatform.h should only be used to define API-specific types.
+ *
+ * Types defined in khrplatform.h:
+ *    khronos_int8_t              signed   8  bit
+ *    khronos_uint8_t             unsigned 8  bit
+ *    khronos_int16_t             signed   16 bit
+ *    khronos_uint16_t            unsigned 16 bit
+ *    khronos_int32_t             signed   32 bit
+ *    khronos_uint32_t            unsigned 32 bit
+ *    khronos_int64_t             signed   64 bit
+ *    khronos_uint64_t            unsigned 64 bit
+ *    khronos_intptr_t            signed   same number of bits as a pointer
+ *    khronos_uintptr_t           unsigned same number of bits as a pointer
+ *    khronos_ssize_t             signed   size
+ *    khronos_usize_t             unsigned size
+ *    khronos_float_t             signed   32 bit floating point
+ *    khronos_time_ns_t           unsigned 64 bit time in nanoseconds
+ *    khronos_utime_nanoseconds_t unsigned time interval or absolute time in
+ *                                         nanoseconds
+ *    khronos_stime_nanoseconds_t signed time interval in nanoseconds
+ *    khronos_boolean_enum_t      enumerated boolean type. This should
+ *      only be used as a base type when a client API's boolean type is
+ *      an enum. Client APIs which use an integer or other type for
+ *      booleans cannot use this as the base type for their boolean.
+ *
+ * Tokens defined in khrplatform.h:
+ *
+ *    KHRONOS_FALSE, KHRONOS_TRUE Enumerated boolean false/true values.
+ *
+ *    KHRONOS_SUPPORT_INT64 is 1 if 64 bit integers are supported; otherwise 0.
+ *    KHRONOS_SUPPORT_FLOAT is 1 if floats are supported; otherwise 0.
+ *
+ * Calling convention macros defined in this file:
+ *    KHRONOS_APICALL
+ *    KHRONOS_APIENTRY
+ *    KHRONOS_APIATTRIBUTES
+ *
+ * These may be used in function prototypes as:
+ *
+ *      KHRONOS_APICALL void KHRONOS_APIENTRY funcname(
+ *                                  int arg1,
+ *                                  int arg2) KHRONOS_APIATTRIBUTES;
+ */
+
+#if defined(__SCITECH_SNAP__) && !defined(KHRONOS_STATIC)
+#   define KHRONOS_STATIC 1
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APICALL
+ *-------------------------------------------------------------------------
+ * This precedes the return type of the function in the function prototype.
+ */
+#if defined(KHRONOS_STATIC)
+    /* If the preprocessor constant KHRONOS_STATIC is defined, make the
+     * header compatible with static linking. */
+#   define KHRONOS_APICALL
+#elif defined(_WIN32)
+#   define KHRONOS_APICALL __declspec(dllimport)
+#elif defined (__SYMBIAN32__)
+#   define KHRONOS_APICALL IMPORT_C
+#elif defined(__ANDROID__)
+#   define KHRONOS_APICALL __attribute__((visibility("default")))
+#else
+#   define KHRONOS_APICALL
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIENTRY
+ *-------------------------------------------------------------------------
+ * This follows the return type of the function  and precedes the function
+ * name in the function prototype.
+ */
+#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(__SCITECH_SNAP__)
+    /* Win32 but not WinCE */
+#   define KHRONOS_APIENTRY __stdcall
+#else
+#   define KHRONOS_APIENTRY
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIATTRIBUTES
+ *-------------------------------------------------------------------------
+ * This follows the closing parenthesis of the function prototype arguments.
+ */
+#if defined (__ARMCC_2__)
+#define KHRONOS_APIATTRIBUTES __softfp
+#else
+#define KHRONOS_APIATTRIBUTES
+#endif
+
+/*-------------------------------------------------------------------------
+ * basic type definitions
+ *-----------------------------------------------------------------------*/
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(__GNUC__) || defined(__SCO__) || defined(__USLC__)
+
+
+/*
+ * Using <stdint.h>
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+/*
+ * To support platform where unsigned long cannot be used interchangeably with
+ * inptr_t (e.g. CHERI-extended ISAs), we can use the stdint.h intptr_t.
+ * Ideally, we could just use (u)intptr_t everywhere, but this could result in
+ * ABI breakage if khronos_uintptr_t is changed from unsigned long to
+ * unsigned long long or similar (this results in different C++ name mangling).
+ * To avoid changes for existing platforms, we restrict usage of intptr_t to
+ * platforms where the size of a pointer is larger than the size of long.
+ */
+#if defined(__SIZEOF_LONG__) && defined(__SIZEOF_POINTER__)
+#if __SIZEOF_POINTER__ > __SIZEOF_LONG__
+#define KHRONOS_USE_INTPTR_T
+#endif
+#endif
+
+#elif defined(__VMS ) || defined(__sgi)
+
+/*
+ * Using <inttypes.h>
+ */
+#include <inttypes.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(_WIN32) && !defined(__SCITECH_SNAP__)
+
+/*
+ * Win32
+ */
+typedef __int32                 khronos_int32_t;
+typedef unsigned __int32        khronos_uint32_t;
+typedef __int64                 khronos_int64_t;
+typedef unsigned __int64        khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__sun__) || defined(__digital__)
+
+/*
+ * Sun or Digital
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#if defined(__arch64__) || defined(_LP64)
+typedef long int                khronos_int64_t;
+typedef unsigned long int       khronos_uint64_t;
+#else
+typedef long long int           khronos_int64_t;
+typedef unsigned long long int  khronos_uint64_t;
+#endif /* __arch64__ */
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif 0
+
+/*
+ * Hypothetical platform with no float or int64 support
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#define KHRONOS_SUPPORT_INT64   0
+#define KHRONOS_SUPPORT_FLOAT   0
+
+#else
+
+/*
+ * Generic fallback
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#endif
+
+
+/*
+ * Types that are (so far) the same on all platforms
+ */
+typedef signed   char          khronos_int8_t;
+typedef unsigned char          khronos_uint8_t;
+typedef signed   short int     khronos_int16_t;
+typedef unsigned short int     khronos_uint16_t;
+
+/*
+ * Types that differ between LLP64 and LP64 architectures - in LLP64,
+ * pointers are 64 bits, but 'long' is still 32 bits. Win64 appears
+ * to be the only LLP64 architecture in current use.
+ */
+#ifdef KHRONOS_USE_INTPTR_T
+typedef intptr_t               khronos_intptr_t;
+typedef uintptr_t              khronos_uintptr_t;
+#elif defined(_WIN64)
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+#endif
+
+#if defined(_WIN64)
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+typedef signed   long  int     khronos_ssize_t;
+typedef unsigned long  int     khronos_usize_t;
+#endif
+
+#if KHRONOS_SUPPORT_FLOAT
+/*
+ * Float type
+ */
+typedef          float         khronos_float_t;
+#endif
+
+#if KHRONOS_SUPPORT_INT64
+/* Time types
+ *
+ * These types can be used to represent a time interval in nanoseconds or
+ * an absolute Unadjusted System Time.  Unadjusted System Time is the number
+ * of nanoseconds since some arbitrary system event (e.g. since the last
+ * time the system booted).  The Unadjusted System Time is an unsigned
+ * 64 bit value that wraps back to 0 every 584 years.  Time intervals
+ * may be either signed or unsigned.
+ */
+typedef khronos_uint64_t       khronos_utime_nanoseconds_t;
+typedef khronos_int64_t        khronos_stime_nanoseconds_t;
+#endif
+
+/*
+ * Dummy value used to pad enum types to 32 bits.
+ */
+#ifndef KHRONOS_MAX_ENUM
+#define KHRONOS_MAX_ENUM 0x7FFFFFFF
+#endif
+
+/*
+ * Enumerated boolean type
+ *
+ * Values other than zero should be considered to be true.  Therefore
+ * comparisons should not be made against KHRONOS_TRUE.
+ */
+typedef enum {
+    KHRONOS_FALSE = 0,
+    KHRONOS_TRUE  = 1,
+    KHRONOS_BOOLEAN_ENUM_FORCE_SIZE = KHRONOS_MAX_ENUM
+} khronos_boolean_enum_t;
+
+#endif /* __khrplatform_h_ */