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refactor for desktop, z-buffer for textured triangles

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This commit is contained in:
jasobake 2026-02-10 23:00:29 -08:00
parent 9529b89127
commit 95c015d719
6 changed files with 135 additions and 29 deletions
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109
CMakeLists.txt
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@ -1,9 +1,74 @@
cmake_minimum_required(VERSION 3.22)
cmake_minimum_required(VERSION 4.0)
project(sdl_project)
set(CMAKE_C_STANDARD 23)
set(CMAKE_C_STANDARD 11)
# Include the command that downloads libraries
include(FetchContent)
# define a function for adding git dependencies
function(include_dependency libName gitURL gitTag)
FetchContent_Declare(${libName}
GIT_REPOSITORY ${gitURL}
GIT_TAG ${gitTag}
GIT_SHALLOW TRUE
GIT_PROGRESS TRUE
)
FetchContent_MakeAvailable(${libName})
endfunction()
# add SDL2 support
find_package(SDL2 QUIET)
if (NOT SDL2_FOUND)
message(STATUS "Getting SDL2 from Github")
include_dependency(SDL2 https://github.com/libsdl-org/SDL.git release-2.30.8)
else()
message(STATUS "Using local SDL2")
endif()
# add SDL2_image support
find_package(SDL2_image QUIET)
if (NOT SDL2_image_FOUND)
message(STATUS "Getting SDL2_image from Github")
include_dependency(SDL2_image https://github.com/libsdl-org/SDL_image.git release-2.8.2)
else()
message(STATUS "Using local SDL2_image")
endif()
## add SDL2_gfx support (NO find_package, fetch and add it manually)
#find_package(SDL2_gfx QUIET)
#if (NOT SDL2_gfx)
# message(STATUS "Getting SDL2_gfx from Github")
# include_dependency(SDL2_gfx https://github.com/giroletm/SDL2_gfx.git release-1.0.4)
#else()
# message(STATUS "Using local SDL2_gfx")
#endif()
# SDL2_gfx (DO NOT use the function for this one)
FetchContent_Declare(
SDL2_gfx
GIT_REPOSITORY https://github.com/giroletm/SDL2_gfx.git
GIT_TAG master
)
FetchContent_MakeAvailable(SDL2_gfx)
message(STATUS "sdl2_gfx_SOURCE_DIR is: ${sdl2_gfx_SOURCE_DIR}")
add_library(SDL2_gfx STATIC
${sdl2_gfx_SOURCE_DIR}/SDL2_gfxPrimitives.c
${sdl2_gfx_SOURCE_DIR}/SDL2_rotozoom.c
)
target_include_directories(SDL2_gfx PUBLIC ${sdl2_gfx_SOURCE_DIR}/sdl2_gfx-src)
target_link_libraries(SDL2_gfx PUBLIC SDL2::SDL2)
# add SDL2_ttf support
#set(SDL2TTF_VENDORED ON)
#find_package(SDL2_ttf QUIET)
#if (NOT SDL2_ttf_FOUND)
# message(STATUS "Getting SDL2_ttf from Github")
# include_dependency(SDL2_ttf https://github.com/libsdl-org/SDL_ttf.git release-2.22.0)
#else()
# message(STATUS "Using local SDL2_ttf")
#endif()
# Must set the path to the main.cpp, for example: scripts/main.cpp if it is inside a folder
add_executable(${PROJECT_NAME} scripts/main.c
scripts/array.c
scripts/vector.c
@ -14,12 +79,36 @@ add_executable(${PROJECT_NAME} scripts/main.c
scripts/texture.c
scripts/swap.c
scripts/upng.c
scripts/display.c)
scripts/display.c
)
# --- SDL2 SETUP ---
set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/modules)
set(SDL2_PATH "SDL2/x86_64-w64-mingw32")
# Target include directories for non-gfx libs
target_include_directories(
${PROJECT_NAME}
PUBLIC
${SDL2_INCLUDE_DIRS}
${SDL2_IMAGE_INCLUDE_DIRS}
# ${SDL2_TTF_INCLUDE_DIRS}
${sdl2_gfx_SOURCE_DIR} # Add SDL2_gfx headers directory
)
find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIR})
target_link_libraries(${PROJECT_NAME} ${SDL2_LIBRARY} ${SDL2_IMAGE_LIBRARIES})
# link all libraries to the project
target_link_libraries(
${PROJECT_NAME}
PRIVATE
SDL2::SDL2
SDL2::SDL2main
SDL2_image::SDL2_image
# SDL2_ttf::SDL2_ttf
SDL2_gfx # Link in the SDL2_gfx library we added
)
if (WIN32)
add_custom_command(
TARGET ${PROJECT_NAME} POST_BUILD
COMMAND "${CMAKE_COMMAND}" -E copy_if_different "$<TARGET_FILE:SDL2::SDL2>" "$<TARGET_FILE_DIR:sdl_project>"
COMMAND "${CMAKE_COMMAND}" -E copy_if_different "$<TARGET_FILE:SDL2_image::SDL2_image>" "$<TARGET_FILE_DIR:sdl_project>"
#COMMAND "${CMAKE_COMMAND}" -E copy_if_different "$<TARGET_FILE:SDL2_ttf::SDL2_ttf>" "$<TARGET_FILE_DIR:sdl_project>"
VERBATIM
)
endif()

BIN
cmake-build-debug/SDL2.dll
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19
scripts/display.c
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@ -2,7 +2,10 @@
#include "display.h"
SDL_Window* window = NULL;
SDL_Renderer* renderer = NULL;
uint32_t* color_buffer = NULL;
float* z_buffer = NULL;
SDL_Texture* color_buffer_texture = NULL;
int window_width = 800;
int window_height = 600;
@ -14,19 +17,19 @@ bool initialize_window(void) {
}
// Set width and height of the SDL window with the max screen resolution
SDL_DisplayMode display_mode;
/*SDL_DisplayMode display_mode;
SDL_GetCurrentDisplayMode(0, &display_mode);
window_width = display_mode.w;
window_height = display_mode.h;
*/
// Create a SDL Window
window = SDL_CreateWindow(
NULL,
"3D Renderer",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
window_width,
window_height,
SDL_WINDOW_BORDERLESS
SDL_WINDOW_SHOWN
);
if (!window) {
fprintf(stderr, "Error creating SDL window.\n");
@ -104,6 +107,14 @@ void clear_color_buffer(uint32_t color) {
}
}
void clear_z_buffer() {
for (int y = 0; y < window_height; y++) {
for (int x = 0; x < window_width; x++) {
z_buffer[(window_width * y) + x] = 1.0F;
}
}
}
void destroy_window(void) {
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);

2
scripts/display.h
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@ -25,6 +25,7 @@ enum render_method {
extern SDL_Window* window;
extern SDL_Renderer* renderer;
extern uint32_t* color_buffer;
extern float* z_buffer;
extern SDL_Texture* color_buffer_texture;
extern int window_width;
extern int window_height;
@ -36,6 +37,7 @@ void draw_line(int x0, int y0, int x1, int y1, uint32_t color);
void draw_rect(int x, int y, int width, int height, uint32_t color);
void render_color_buffer(void);
void clear_color_buffer(uint32_t color);
void clear_z_buffer();
void destroy_window(void);
#endif

19
scripts/main.c
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@ -33,8 +33,9 @@ void setup(void) {
render_method = RENDER_TEXTURED_WIRE;
cull_method = CULL_BACKFACE;
// Allocate the required memory in bytes to hold the color buffer
// Allocate the required memory in bytes to hold the color buffer and z buffer
color_buffer = (uint32_t*)malloc(sizeof(uint32_t) * window_width * window_height);
z_buffer = (float*)malloc(sizeof(float) * window_width * window_height);
// Creating a SDL texture that is used to display the color buffer
color_buffer_texture = SDL_CreateTexture(
@ -234,19 +235,6 @@ void update(void) {
// Save the projected triangle in the array of triangles to render
array_push(triangles_to_render, projected_triangle);
}
// Sort the triangles to render by their avg_depth
int num_triangles = array_length(triangles_to_render);
for (int i = 0; i < num_triangles; i++) {
for (int j = i; j < num_triangles; j++) {
if (triangles_to_render[i].avg_depth < triangles_to_render[j].avg_depth) {
// Swap the triangles positions in the array
triangle_t temp = triangles_to_render[i];
triangles_to_render[i] = triangles_to_render[j];
triangles_to_render[j] = temp;
}
}
}
}
///////////////////////////////////////////////////////////////////////////////
@ -305,7 +293,9 @@ void render(void) {
render_color_buffer();
clear_color_buffer(0xFF000000);
clear_z_buffer();
SDL_RenderPresent(renderer);
}
@ -315,6 +305,7 @@ void render(void) {
///////////////////////////////////////////////////////////////////////////////
void free_resources(void) {
free(color_buffer);
free(z_buffer);
array_free(mesh.faces);
array_free(mesh.vertices);
upng_free(png_texture);

15
scripts/triangle.c
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@ -208,7 +208,19 @@ void draw_texel(
int tex_y = abs((int)(interpolated_v * texture_height)) % texture_height;
//tex_x = SDL_clamp(tex_x, 0, texture_width);
//tex_y = SDL_clamp(tex_y, 0, texture_height);
draw_pixel(x, y, texture[(texture_width * tex_y) + tex_x]);
int z_pos = (window_width * y) + x;
// Adjust 1/w so the pixels that are closer to the camera have smaller values
interpolated_reciprocal_w = 1.0 - interpolated_reciprocal_w;
// only draw pixel if depth value is less than one previously stored in z-buffer
if (interpolated_reciprocal_w < z_buffer[z_pos]) {
draw_pixel(x, y, texture[(texture_width * tex_y) + tex_x]);
// update z-buffer value with the 1/w of this current pixel
z_buffer[z_pos] = interpolated_reciprocal_w;
}
}
///////////////////////////////////////////////////////////////////////////////
@ -326,3 +338,4 @@ void draw_textured_triangle(
}
}
}