diff options
Diffstat (limited to 'fbgl.h')
| -rw-r--r-- | fbgl.h | 212 |
1 files changed, 185 insertions, 27 deletions
@@ -17,6 +17,7 @@ #include <stdio.h> #include <termios.h> #include <signal.h> +#include <stdbool.h> #ifdef FBGL_USE_FREETYPE #include <ft2build.h> @@ -63,6 +64,12 @@ typedef struct fbgl_point { size_t y; } fbgl_point_t; +typedef struct fbgl_tga_texture { + uint16_t width; + uint16_t height; + uint32_t *data; +} fbgl_tga_texture_t; + #ifdef FBGL_HIDE_CURSOR #include <linux/kd.h> int fbgl_hide_cursor(int fd) @@ -142,6 +149,13 @@ void fbgl_draw_rectangle_filled(fbgl_point_t top_left, fbgl_point_t bottom_right, uint32_t color, fbgl_t *fb); +/** + * texture + */ +fbgl_tga_texture_t *fbgl_load_tga_texture(const char *path); +void fbgl_destroy_texture(fbgl_tga_texture_t *texture); +void fbgl_draw_texture(fbgl_t *fb, fbgl_tga_texture_t *texture, int x, int y); + #ifdef FBGL_IMPLEMENTATION char const *fbgl_name_info(void) @@ -406,37 +420,181 @@ void fbgl_draw_line(fbgl_point_t x, fbgl_point_t y, uint32_t color, } } } -void fbgl_draw_rectangle_outline(fbgl_point_t top_left, fbgl_point_t bottom_right, uint32_t color, fbgl_t *fb) { - // Top horizontal line - for (int x = top_left.x; x < bottom_right.x; x++) { - fbgl_put_pixel(x, top_left.y, color, fb); - } - - // Bottom horizontal line - for (int x = top_left.x; x < bottom_right.x; x++) { - fbgl_put_pixel(x, bottom_right.y - 1, color, fb); - } - - // Left vertical line - for (int y = top_left.y; y < bottom_right.y; y++) { - fbgl_put_pixel(top_left.x, y, color, fb); - } - - // Right vertical line - for (int y = top_left.y; y < bottom_right.y; y++) { - fbgl_put_pixel(bottom_right.x - 1, y, color, fb); - } +void fbgl_draw_rectangle_outline(fbgl_point_t top_left, + fbgl_point_t bottom_right, uint32_t color, + fbgl_t *fb) +{ + // Top horizontal line + for (int x = top_left.x; x < bottom_right.x; x++) { + fbgl_put_pixel(x, top_left.y, color, fb); + } + + // Bottom horizontal line + for (int x = top_left.x; x < bottom_right.x; x++) { + fbgl_put_pixel(x, bottom_right.y - 1, color, fb); + } + + // Left vertical line + for (int y = top_left.y; y < bottom_right.y; y++) { + fbgl_put_pixel(top_left.x, y, color, fb); + } + + // Right vertical line + for (int y = top_left.y; y < bottom_right.y; y++) { + fbgl_put_pixel(bottom_right.x - 1, y, color, fb); + } } -void fbgl_draw_rectangle_filled(fbgl_point_t top_left, fbgl_point_t bottom_right, uint32_t color, fbgl_t *fb) { - for (int y = top_left.y; y < bottom_right.y; y++) { - // Manually set each pixel in the row - for (int x = top_left.x; x < bottom_right.x; x++) { - fbgl_put_pixel(x, y, color, fb); - } - } +void fbgl_draw_rectangle_filled(fbgl_point_t top_left, + fbgl_point_t bottom_right, uint32_t color, + fbgl_t *fb) +{ + for (int y = top_left.y; y < bottom_right.y; y++) { + // Manually set each pixel in the row + for (int x = top_left.x; x < bottom_right.x; x++) { + fbgl_put_pixel(x, y, color, fb); + } + } } +fbgl_tga_texture_t *fbgl_load_tga_texture(const char *path) +{ + FILE *file = fopen(path, "rb"); + if (!file) { + perror("Unable to open texture file"); + return NULL; + } + + // TGA header structure + uint8_t header[18]; + if (fread(header, 1, sizeof(header), file) != sizeof(header)) { + perror("Error reading TGA header"); + fclose(file); + return NULL; + } + + // Allocate texture structure + fbgl_tga_texture_t *texture = + (fbgl_tga_texture_t *)malloc(sizeof(fbgl_tga_texture_t)); + if (!texture) { + perror("Failed to allocate texture structure"); + fclose(file); + return NULL; + } + + // Extract dimensions from header + texture->width = header[12] | (header[13] << 8); + texture->height = header[14] | (header[15] << 8); + uint8_t bits_per_pixel = header[16]; + uint8_t image_descriptor = header[17]; + + // Verify format support + if (bits_per_pixel != 24 && bits_per_pixel != 32) { + fprintf(stderr, + "Unsupported TGA bit depth: %d (only 24 and 32-bit supported)\n", + bits_per_pixel); + free(texture); + fclose(file); + return NULL; + } + // Skip image ID field + if (header[0]) { + fseek(file, header[0], SEEK_CUR); + } + + // Allocate pixel data + size_t pixel_count = texture->width * texture->height; + texture->data = (uint32_t *)malloc(pixel_count * sizeof(uint32_t)); + if (!texture->data) { + perror("Failed to allocate pixel data"); + free(texture); + fclose(file); + return NULL; + } + + // Read pixel data + uint8_t *pixel_buffer = (uint8_t *)malloc(bits_per_pixel / 8); + if (!pixel_buffer) { + perror("Failed to allocate pixel buffer"); + free(texture->data); + free(texture); + fclose(file); + return NULL; + } + + // Determine if image is flipped (based on image descriptor) + bool bottom_up = !(image_descriptor & 0x20); + + for (size_t i = 0; i < pixel_count; i++) { + size_t pixel_index = + bottom_up ? + (texture->height - 1 - (i / texture->width)) * + texture->width + + (i % texture->width) : + i; + + if (fread(pixel_buffer, 1, bits_per_pixel / 8, file) != + bits_per_pixel / 8) { + perror("Error reading pixel data"); + free(pixel_buffer); + free(texture->data); + free(texture); + fclose(file); + return NULL; + } + + // Convert BGR(A) to RGBA + uint32_t pixel = 0xFF000000; // Default alpha to 255 + pixel |= pixel_buffer[2] << 16; // R + pixel |= pixel_buffer[1] << 8; // G + pixel |= pixel_buffer[0]; // B + if (bits_per_pixel == 32) { + pixel = (pixel & 0x00FFFFFF) | + (pixel_buffer[3] << 24); // A + } + + texture->data[pixel_index] = pixel; + } + + free(pixel_buffer); + fclose(file); + return texture; +} + +void fbgl_destroy_texture(fbgl_tga_texture_t *texture) +{ + if (texture) { + free(texture->data); + free(texture); + } +} + +void fbgl_draw_texture(fbgl_t *fb, fbgl_tga_texture_t *texture, int x, int y) +{ + if (!fb || !texture || !texture->data) { + return; + } + + for (int ty = 0; ty < texture->height; ty++) { + for (int tx = 0; tx < texture->width; tx++) { + int screen_x = x + tx; + int screen_y = y + ty; + + // Skip if outside screen bounds + if (screen_x < 0 || screen_x >= fb->width || + screen_y < 0 || screen_y >= fb->height) { + continue; + } + + uint32_t pixel = + texture->data[ty * texture->width + tx]; + // Only draw if pixel is not fully transparent + if ((pixel & 0xFF000000) != 0) { + fbgl_put_pixel(screen_x, screen_y, pixel, fb); + } + } + } +} #ifdef __cplusplus } // extern "C" #endif |