Shader textures

CMakeLists.txt

@@ -3,6 +3,7 @@ project(OpenGX VERSION 0.1)
 
 option(BUILD_OPENGX "Build the opengx library" ON)
 option(BUILD_DOCS "Build the documentation" OFF)
+option(BUILD_EXAMPLES "Build the examples" OFF)
 
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_CXX_STANDARD 17)
@@ -38,13 +39,21 @@ add_library(${TARGET} STATIC
     src/gpu_resources.h
     src/image_DXT.c
     src/image_DXT.h
+    src/murmurhash3.cpp
+    src/murmurhash3.h
     src/opengx.h
     src/pixel_stream.cpp
     src/pixel_stream.h
     src/pixels.cpp
     src/pixels.h
     src/raster.cpp
     src/selection.c
+    src/shader.c
+    src/shader.h
+    src/shader_api.c
+    src/shader_attribute.cpp
+    src/shader_functions.h
+    src/shader_uniform.c
     src/state.h
     src/stencil.c
     src/stencil.h
@@ -64,6 +73,7 @@ set_target_properties(${TARGET} PROPERTIES
 )
 
 target_include_directories(${TARGET} PUBLIC
+    src/
     ${CMAKE_CURRENT_SOURCE_DIR}/include
 )
 
@@ -75,7 +85,7 @@ install(TARGETS ${TARGET}
     RUNTIME
     PUBLIC_HEADER
 )
-install(DIRECTORY "include/GL" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
+install(DIRECTORY "include/GL" "include/KHR" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/opengl.pc
         DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
 install(FILES OpenGLConfig.cmake
@@ -87,3 +97,7 @@ if(BUILD_DOCS)
     include(UseLATEX)
     add_subdirectory(doc/src)
 endif()
+
+if(BUILD_EXAMPLES)
+    add_subdirectory(examples)
+endif()

examples/CMakeLists.txt

@@ -0,0 +1,9 @@
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(SDL2 IMPORTED_TARGET sdl2)
+pkg_check_modules(OPENGL IMPORTED_TARGET opengl)
+
+add_subdirectory(common)
+
+if(SDL2_FOUND)
+    add_subdirectory(sdl2)
+endif()

examples/common/CMakeLists.txt

@@ -0,0 +1,40 @@
+pkg_check_modules(PNG IMPORTED_TARGET libpng)
+
+set(EXTRA_LIBS)
+if(CMAKE_SYSTEM_NAME MATCHES "NintendoWii|NintendoGameCube")
+    list(APPEND EXTRA_LIBS opengx)
+else()
+    list(APPEND EXTRA_LIBS PkgConfig::OPENGL)
+endif()
+
+function(add_resource out_var)
+    set(result)
+    foreach(in_f ${ARGN})
+        string(MAKE_C_IDENTIFIER ${in_f} input_identifier)
+        set(out_f "${CMAKE_CURRENT_BINARY_DIR}/${input_identifier}.o")
+
+        add_custom_command(
+            OUTPUT ${out_f}
+            COMMAND ${CMAKE_LINKER} -z noexecstack --relocatable --format binary --output ${out_f} ${in_f}
+            DEPENDS ${in_f}
+            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+            COMMENT "Embedding ${in_f} as a resource"
+        )
+        list(APPEND result ${out_f})
+    endforeach()
+    set(${out_var} ${result} PARENT_SCOPE)
+endfunction()
+
+if(PNG_FOUND)
+    add_resource(TEXTURES
+        grid512.png
+        mix256.png
+    )
+    add_library(textures STATIC
+        ${TEXTURES}
+        textures.c
+        textures.h
+    )
+    target_link_libraries(textures PUBLIC ${EXTRA_LIBS} PkgConfig::PNG)
+    target_include_directories(textures PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+endif()

examples/common/textures.c

@@ -0,0 +1,53 @@
+/*****************************************************************************
+Copyright (c) 2024  Alberto Mardegan ([email protected])
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of copyright holders nor the names of its
+   contributors may be used to endorse or promote products derived
+   from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL COPYRIGHT HOLDERS OR CONTRIBUTORS
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+*****************************************************************************/
+
+#include "textures.h"
+
+#include <png.h>
+#include <stdlib.h>
+#include <string.h>
+
+GLuint textures_load_range(const char *start, const char *end)
+{
+    png_image png;
+    memset(&png, 0, sizeof(png));
+    png.version = PNG_IMAGE_VERSION;
+    png_image_begin_read_from_memory(&png, start, end - start);
+    png.format = PNG_FORMAT_RGBA;
+
+    char *buffer = malloc(PNG_IMAGE_SIZE(png));
+    png_image_finish_read(&png, NULL, buffer, 0, NULL);
+
+    GLuint texture;
+    glGenTextures(1, &texture);
+    glBindTexture(GL_TEXTURE_2D, texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, png.width, png.height, 0,
+                 GL_RGBA, GL_UNSIGNED_BYTE, buffer);
+    png_image_free(&png);
+    return texture;
+}

examples/common/textures.h

@@ -0,0 +1,53 @@
+/*****************************************************************************
+Copyright (c) 2024  Alberto Mardegan ([email protected])
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of copyright holders nor the names of its
+   contributors may be used to endorse or promote products derived
+   from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL COPYRIGHT HOLDERS OR CONTRIBUTORS
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+*****************************************************************************/
+#ifndef TEXTURES_H
+#define TEXTURES_H
+
+#include <GL/gl.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define DECLARE_EMBEDDED_FILE(basename) \
+    extern char _binary_ ## basename ## _start[], _binary_ ## basename ## _end[]
+
+DECLARE_EMBEDDED_FILE(grid512_png);
+DECLARE_EMBEDDED_FILE(mix256_png);
+
+#define textures_load(basename) \
+    textures_load_range(_binary_ ## basename ## _start, \
+                        _binary_ ## basename ## _end)
+
+GLuint textures_load_range(const char *start, const char *end);
+
+#ifdef __cplusplus
+} // extern C
+#endif
+
+#endif /* TEXTURES_H */

examples/sdl2/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(opengl20)

examples/sdl2/opengl20/CMakeLists.txt

@@ -0,0 +1,26 @@
+set(EXTRA_FILES)
+set(EXTRA_LIBS)
+if(CMAKE_SYSTEM_NAME MATCHES "NintendoWii|NintendoGameCube")
+    list(APPEND EXTRA_FILES opengx_shaders.c)
+    list(APPEND EXTRA_LIBS opengx)
+else()
+    list(APPEND EXTRA_LIBS PkgConfig::OPENGL)
+endif()
+
+macro(add_example name)
+    add_executable(${name} ${EXTRA_FILES} ${ARGN})
+    if (TARGET textures)
+        list(APPEND EXTRA_LIBS textures)
+    endif()
+    if (TARGET PkgConfig::GLM)
+        list(APPEND EXTRA_LIBS PkgConfig::GLM)
+    endif()
+    target_link_libraries(${name} ${EXTRA_LIBS} m PkgConfig::SDL2)
+endmacro()
+
+pkg_check_modules(GLM IMPORTED_TARGET glm)
+
+if(GLM_FOUND)
+    add_example(cube_tex cube_tex.cpp)
+endif()
+add_example(gl2gears gl2gears.c)