From 80cdd4f2b1c2a3355926b59a85e14100b3daa7b7 Mon Sep 17 00:00:00 2001
From: omnisci3nce <17525998+omnisci3nce@users.noreply.github.com>
Date: Wed, 27 Mar 2024 21:05:04 +1100
Subject: simple shaders for testing

---
 assets/shaders/triangle.frag           |  8 ++++++++
 assets/shaders/triangle.vert           |  8 ++++++++
 src/renderer/backends/backend_vulkan.c | 24 ++++++++++++++++++++++--
 xmake.lua                              | 17 ++++++++++++++---
 4 files changed, 52 insertions(+), 5 deletions(-)
 create mode 100644 assets/shaders/triangle.frag
 create mode 100644 assets/shaders/triangle.vert

diff --git a/assets/shaders/triangle.frag b/assets/shaders/triangle.frag
new file mode 100644
index 0000000..d26e5c4
--- /dev/null
+++ b/assets/shaders/triangle.frag
@@ -0,0 +1,8 @@
+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(location = 0) out vec4 out_colour;
+
+void main() {
+    out_colour = vec4(1.0);
+}
\ No newline at end of file
diff --git a/assets/shaders/triangle.vert b/assets/shaders/triangle.vert
new file mode 100644
index 0000000..0518c62
--- /dev/null
+++ b/assets/shaders/triangle.vert
@@ -0,0 +1,8 @@
+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(location = 0) in vec3 in_position;
+
+void main() {
+    gl_Position = vec4(in_position, 1.0);
+}
\ No newline at end of file
diff --git a/src/renderer/backends/backend_vulkan.c b/src/renderer/backends/backend_vulkan.c
index 2b6bcd5..863cd65 100644
--- a/src/renderer/backends/backend_vulkan.c
+++ b/src/renderer/backends/backend_vulkan.c
@@ -176,9 +176,29 @@ bool create_shader_module(vulkan_context* context, const char* filename, const c
   // char file_name[512];
 
   memset(&shader_stages[stage_index].create_info, 0, sizeof(VkShaderModuleCreateInfo));
+  memset(&shader_stages[stage_index].stage_create_info, 0, sizeof(VkPipelineShaderStageCreateInfo));
+
   shader_stages[stage_index].create_info.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
 
   // todo: file input
+  const char* file_contents = string_from_file(filename);
+
+  u64 bytes = strlen(file_contents);
+  shader_stages[stage_index].create_info.codeSize = bytes;
+  shader_stages[stage_index].create_info.pCode = (u32*)file_contents;
+
+  vkCreateShaderModule(context->device.logical_device, &shader_stages[stage_index].create_info,
+                       context->allocator, &shader_stages[stage_index].handle);
+
+  shader_stages[stage_index].stage_create_info.sType =
+      VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
+  shader_stages[stage_index].stage_create_info.stage = flag;
+  shader_stages[stage_index].stage_create_info.module = shader_stages[stage_index].handle;
+  shader_stages[stage_index].stage_create_info.pName = "main";
+
+  free(file_contents);
+
+  return true;
 }
 
 bool vulkan_object_shader_create(vulkan_context* context, vulkan_shader* out_shader) {
@@ -186,8 +206,8 @@ bool vulkan_object_shader_create(vulkan_context* context, vulkan_shader* out_sha
   VkShaderStageFlagBits stage_types[SHADER_STAGE_COUNT] = { VK_SHADER_STAGE_VERTEX_BIT,
                                                             VK_SHADER_STAGE_FRAGMENT_BIT };
   for (u8 i = 0; i < SHADER_STAGE_COUNT; i++) {
-    create_shader_module(context, "build/linux/x86_64/debug/blinn_phong.vert.spv",
-                         stage_type_strs[i], stage_types[i], i, out_shader->stages);
+    create_shader_module(context, "build/linux/x86_64/debug/triangle.vert.spv", stage_type_strs[i],
+                         stage_types[i], i, out_shader->stages);
   }
 }
 void vulkan_object_shader_destroy(vulkan_context* context, vulkan_shader* shader) {}
diff --git a/xmake.lua b/xmake.lua
index 32e5ba4..5457ccb 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -63,7 +63,7 @@ local core_sources = {
     "src/systems/*.c",
 }
 
-rule("compile_glsl_shaders")
+rule("compile_glsl_vert_shaders")
     set_extensions(".vert")
     on_buildcmd_file(function (target, batchcmds, sourcefile, opt) 
         local targetfile = path.join(target:targetdir(), path.basename(sourcefile) .. ".vert.spv")
@@ -72,6 +72,15 @@ rule("compile_glsl_shaders")
         batchcmds:vrunv('glslc', {sourcefile, "-o", targetfile})
         batchcmds:add_depfiles(sourcefile)
 end)
+rule("compile_glsl_frag_shaders")
+    set_extensions(".frag")
+    on_buildcmd_file(function (target, batchcmds, sourcefile, opt) 
+        local targetfile = path.join(target:targetdir(), path.basename(sourcefile) .. ".frag.spv")
+        
+        print("Compiling shader: %s", sourcefile)
+        batchcmds:vrunv('glslc', {sourcefile, "-o", targetfile})
+        batchcmds:add_depfiles(sourcefile)
+end)
 -- TODO: Metal shaders compilation
 
 -- common configuration for both static and shared libraries
@@ -94,9 +103,11 @@ target("core_config")
     add_includedirs("src/std/", {public = true})
     add_includedirs("src/std/containers", {public = true})
     add_includedirs("src/systems/", {public = true})
-    add_rules("compile_glsl_shaders")
+    add_rules("compile_glsl_vert_shaders")
+    add_rules("compile_glsl_frag_shaders")
     add_files("src/empty.c") -- for some reason we need this on Mac so it doesnt call 'ar' with no files and error
-    add_files("assets/shaders/*.vert")
+    add_files("assets/shaders/triangle.vert")
+    add_files("assets/shaders/triangle.frag")
     -- add_files("assets/shaders/*.frag")
     set_default(false) -- prevents standalone building of this target
 
-- 
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