From ba447583c74d44c6b07c5409918207157f921efe Mon Sep 17 00:00:00 2001
From: Frederico Linhares <fred@linhares.blue>
Date: Mon, 9 Oct 2023 14:46:09 -0300
Subject: feat Render sprite in a 3D position

---
 glsl/shader_sprite_3d.frag.glsl | 42 ++++++++++++++++++++++++
 glsl/shader_sprite_3d.vert.glsl | 73 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 115 insertions(+)
 create mode 100644 glsl/shader_sprite_3d.frag.glsl
 create mode 100644 glsl/shader_sprite_3d.vert.glsl

(limited to 'glsl')

diff --git a/glsl/shader_sprite_3d.frag.glsl b/glsl/shader_sprite_3d.frag.glsl
new file mode 100644
index 0000000..fe823f8
--- /dev/null
+++ b/glsl/shader_sprite_3d.frag.glsl
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+struct DataTransferObject
+{
+  vec4 frag_color;
+  vec2 frag_texture_coord;
+};
+
+layout(location = 0) in DataTransferObject in_dto;
+
+layout(location = 0) out vec4 out_color;
+
+layout(set = 0, binding = 1) uniform UBOWorld
+{
+  vec3 directional_light_direction;
+  vec4 directional_light_color;
+} ubo_world;
+
+layout(set = 2, binding = 1) uniform sampler2D texture_sampler;
+
+void
+main()
+{
+  out_color = texture(texture_sampler, in_dto.frag_texture_coord);
+}
diff --git a/glsl/shader_sprite_3d.vert.glsl b/glsl/shader_sprite_3d.vert.glsl
new file mode 100644
index 0000000..f7c6cf6
--- /dev/null
+++ b/glsl/shader_sprite_3d.vert.glsl
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2022-2023 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(location = 0) in vec2 in_texture_coord;
+
+layout(location = 0) out DataTransferObject
+{
+  vec4 frag_color;
+  vec2 frag_texture_coord;
+} out_dto;
+
+layout(set = 0, binding = 0) uniform UBOWorld
+{
+  vec4 ambient_light_color;
+} ubo_world;
+
+layout(set = 1, binding = 0) uniform UBOView
+{
+  mat4 view;
+  mat4 proj;
+} ubo_view;
+
+layout(set = 2, binding = 0) uniform UBOSprite3D
+{
+  vec3 position;
+  vec2 size;
+} ubo_position;
+
+void
+main()
+{
+  vec4 position = vec4(ubo_position.position, 1.0);
+  position = ubo_view.view * position;
+  switch(gl_VertexIndex)
+  {
+  case 0:
+    position.x -= ubo_position.size.x/2;
+    position.y -= ubo_position.size.y/2;
+    break;
+  case 1:
+    position.x -= ubo_position.size.x/2;
+    position.y += ubo_position.size.y/2;
+    break;
+  case 2:
+    position.x += ubo_position.size.x/2;
+    position.y -= ubo_position.size.y/2;
+    break;
+  case 3:
+    position.x += ubo_position.size.x/2;
+    position.y += ubo_position.size.y/2;
+    break;
+  }
+  gl_Position = ubo_view.proj * position;
+
+  out_dto.frag_color = ubo_world.ambient_light_color;
+  out_dto.frag_texture_coord = in_texture_coord;
+}
-- 
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