Asset loading with metadesk

assets.mdesk

@@ -0,0 +1,4 @@
+@image merchant:
+{
+    filepath = "merchant.png",
+}

build_desktop_debug.bat

@@ -2,7 +2,7 @@
 
 @REM https://learn.microsoft.com/en-us/cpp/build/reference/compiler-options-listed-by-category?view=msvc-170
 
-call shadergen.bat || goto :error
+call run_codegen.bat || goto :error
 cl /DDEVTOOLS /Igen /Ithirdparty /W3 /Zi /WX main.c || goto :error
 goto :EOF
 

codegen.c

@@ -0,0 +1,83 @@
+#include <stdio.h>
+
+#define assert(cond, explanation) { if(!cond) { printf("Codegen assertion %s failed: %.*s\n", #cond, MD_S8VArg(explanation)); exit(1); } }
+
+#pragma warning(disable : 4996) // nonsense about fopen being insecure
+
+#pragma warning(push)
+#pragma warning(disable : 4244) // loss of data warning
+#pragma warning(disable : 4101) // unreferenced local variable
+#include "md.h"
+#include "md.c"
+#pragma warning(pop)
+
+
+MD_String8 OUTPUT_FOLDER = MD_S8LitComp("gen"); // no trailing slash
+MD_String8 ASSETS_FOLDER = MD_S8LitComp("assets");
+
+#define log(...) { printf("Codegen: "); printf(__VA_ARGS__); }
+
+void dump(MD_ParseResult parse) {
+    // Iterate through each top-level node
+    for(MD_EachNode(node, parse.node->first_child))
+    {
+        printf("/ %.*s\n", MD_S8VArg(node->string));
+
+        // Print the name of each of the node's tags
+        for(MD_EachNode(tag, node->first_tag))
+        {
+            printf("|-- Tag %.*s\n", MD_S8VArg(tag->string));
+        }
+
+        // Print the name of each of the node's children
+        for(MD_EachNode(child, node->first_child))
+        {
+            printf("|-- Child %.*s\n", MD_S8VArg(child->string));
+        }
+    }
+}
+
+int main(int argc, char **argv) {
+    MD_Arena *cg_arena = MD_ArenaAlloc();
+    assert(cg_arena, MD_S8Lit("Memory"));
+
+    // I hope to God MD_String8's are null terminated...
+    MD_String8 writeto = MD_S8Fmt(cg_arena, "%.*s/assets.gen.c", MD_S8VArg(OUTPUT_FOLDER));
+    log("Writing to %.*s\n", MD_S8VArg(writeto));
+    FILE *output = fopen(writeto.str, "w");
+
+    MD_ParseResult parse = MD_ParseWholeFile(cg_arena, MD_S8Lit("assets.mdesk"));
+
+    //dump(parse);
+
+    MD_String8List declarations_list = {0};
+    MD_String8List load_list = {0};
+    for(MD_EachNode(node, parse.node->first_child)) {
+        if(MD_S8Match(node->first_tag->string, MD_S8Lit("image"), 0)) {
+            MD_String8 variable_name = MD_S8Fmt(cg_arena, "image_%.*s", MD_S8VArg(node->string));
+            log("New image variable %.*s\n", MD_S8VArg(variable_name));
+            MD_String8 filepath = {0};
+            for(MD_EachNode(child, node->first_child)) {
+                if(MD_S8Match(child->string, MD_S8Lit("filepath"), 0)) {
+                    filepath = child->next->next->string;
+                }
+            }
+            filepath = MD_S8Fmt(cg_arena, "%.*s/%.*s", MD_S8VArg(ASSETS_FOLDER), MD_S8VArg(filepath));
+            assert(filepath.str != 0, MD_S8Fmt(cg_arena, "No filepath specified for image '%.*s'", MD_S8VArg(node->string)));
+            FILE *asset_file = fopen(filepath.str, "r");
+            assert(asset_file, MD_S8Fmt(cg_arena, "Could not open filepath %.*s for asset '%.*s'", MD_S8VArg(filepath), MD_S8VArg(node->string)));
+            fclose(asset_file);
+
+            MD_S8ListPush(cg_arena, &declarations_list, MD_S8Fmt(cg_arena, "sg_image %.*s = {0};\n", MD_S8VArg(variable_name)));
+            MD_S8ListPush(cg_arena, &load_list, MD_S8Fmt(cg_arena, "%.*s = load_image(\"%.*s\");\n", MD_S8VArg(variable_name), MD_S8VArg(filepath)));
+        }
+    }
+
+    MD_StringJoin join = MD_ZERO_STRUCT;
+    MD_String8 declarations = MD_S8ListJoin(cg_arena, declarations_list, &join);
+    MD_String8 loads = MD_S8ListJoin(cg_arena, load_list, &join);
+    fprintf(output, "%.*s\nvoid load_assets() {\n%.*s\n}", MD_S8VArg(declarations), MD_S8VArg(loads));
+
+    fclose(output);
+    return 0;
+}

main.c

@@ -6,13 +6,40 @@
 #include "sokol_gfx.h"
 #include "sokol_time.h"
 #include "sokol_glue.h"
-#include "quad-sapp.glsl.h"
 #define STB_IMAGE_IMPLEMENTATION
 #include "stb_image.h"
 #include "HandMadeMath.h"
 
 #include <math.h>
 
+sg_image load_image(const char *path) {
+    sg_image to_return = {0};
+
+    int png_width, png_height, num_channels;
+    const int desired_channels = 4;
+    stbi_uc* pixels = stbi_load(
+        path,
+        &png_width, &png_height,
+        &num_channels, 0);
+    assert(pixels);
+    to_return = sg_make_image(&(sg_image_desc){
+        .width = png_width,
+        .height = png_height,
+        .pixel_format = SG_PIXELFORMAT_RGBA8,
+        .min_filter = SG_FILTER_NEAREST,
+        .mag_filter = SG_FILTER_NEAREST,
+        .data.subimage[0][0] = {
+            .ptr = pixels,
+            .size = (size_t)(png_width * png_height * 4),
+        }
+    });
+    stbi_image_free(pixels);
+    return to_return;
+}
+
+#include "quad-sapp.glsl.h"
+#include "assets.gen.c"
+
 // so can be grep'd and removed
 #define dbgprint(...) { printf("Debug | %s:%d | ", __FILE__, __LINE__); printf(__VA_ARGS__); }
 
@@ -22,37 +49,13 @@ static struct {
     sg_bindings bind;
 } state;
 
-sg_image merchant_tilesheet = {0};
-
 void init(void) {
     stm_setup();
     sg_setup(&(sg_desc){
         .context = sapp_sgcontext()
     });
 
-    // load the image
-
-    int png_width, png_height, num_channels;
-    const int desired_channels = 4;
-    stbi_uc* pixels = stbi_load(
-        "assets/merchant.png",
-        &png_width, &png_height,
-        &num_channels, 0);
-    assert(pixels);
-    {
-        merchant_tilesheet = sg_make_image(&(sg_image_desc){
-            .width = png_width,
-            .height = png_height,
-            .pixel_format = SG_PIXELFORMAT_RGBA8,
-            .min_filter = SG_FILTER_NEAREST,
-            .mag_filter = SG_FILTER_NEAREST,
-            .data.subimage[0][0] = {
-                .ptr = pixels,
-                .size = (size_t)(png_width * png_height * 4),
-            }
-        });
-        stbi_image_free(pixels);
-    }
+    load_assets();
 
     state.bind.vertex_buffers[0] = sg_make_buffer(&(sg_buffer_desc){
         .usage = SG_USAGE_STREAM,
@@ -187,7 +190,7 @@ void frame(void) {
 
     int index = (int)floor(time/0.3);
 
-    sg_image_info info = sg_query_image_info(merchant_tilesheet);
+    sg_image_info info = sg_query_image_info(image_merchant);
 
     int cell_size = 110;
     assert(info.width % cell_size == 0);
@@ -195,7 +198,7 @@ void frame(void) {
     region.upper_left = HMM_V2( (float)((index % (info.width/cell_size)) * cell_size), 0.0);
     region.lower_right = HMM_V2(region.upper_left.X + (float)cell_size, (float)cell_size);
 
-    draw_quad_all_parameters(points, merchant_tilesheet, region, col(1.0, 1.0, 1.0, 1.0));
+    draw_quad_all_parameters(points, image_merchant, region, col(1.0, 1.0, 1.0, 1.0));
 
     sg_end_pass();
     sg_commit();

run_codegen.bat

@@ -1,8 +1,14 @@
 @echo off
 rmdir /S /q gen
 mkdir gen
+
+@REM shaders
 thirdparty\sokol-shdc.exe --input quad.glsl --output gen\quad-sapp.glsl.h --slang glsl330:hlsl5:metal_macos || goto :error
 
+@REM metadesk codegen
+cl /Ithirdparty /W3 /Zi /WX codegen.c || goto :error
+codegen || goto :error
+
 goto :EOF
 
 :error