From: Brendan Hansen <brendan.f.hansen@gmail.com>
Date: Mon, 17 Jan 2022 16:23:46 +0000 (-0600)
Subject: added fog
X-Git-Url: https://git.brendanfh.com/?a=commitdiff_plain;h=b808e1531c3f211e83843ee107f60576c803aec3;p=voxel-shooter.git

added fog
---

diff --git a/run_tree/assets/shaders/world_fragment.glsl b/run_tree/assets/shaders/world_fragment.glsl
index f54d2ff..dc1ff92 100644
--- a/run_tree/assets/shaders/world_fragment.glsl
+++ b/run_tree/assets/shaders/world_fragment.glsl
@@ -3,11 +3,22 @@ precision mediump float;
 
 uniform sampler2D u_sampler;
 
+uniform vec3 u_fog_color;
+uniform float u_fog_start;
+uniform float u_fog_range;
+
+
 in vec4 v_color;
 in vec2 v_tex;
 in float v_tex_enabled;
+in float v_dist;
 
 out vec4 fragColor;
 void main() {
-    fragColor = vec4((v_color * mix(vec4(1), texture(u_sampler, v_tex), v_tex_enabled)).xyz, 1);
+    vec4 tile_color = vec4((v_color * mix(vec4(1), texture(u_sampler, v_tex), v_tex_enabled)).xyz, 1);
+
+    // Not going to rely on clamp() existing.
+    float fog = min(1.0f, max(0.0f, (v_dist - u_fog_start) / u_fog_range));
+
+    fragColor = mix(tile_color, vec4(u_fog_color, 1), fog);
 }
diff --git a/run_tree/assets/shaders/world_vertex.glsl b/run_tree/assets/shaders/world_vertex.glsl
index 5e53074..ff7709c 100644
--- a/run_tree/assets/shaders/world_vertex.glsl
+++ b/run_tree/assets/shaders/world_vertex.glsl
@@ -12,9 +12,12 @@ layout(std140) uniform u_world_matrix_block {
 out vec4 v_color;
 out vec2 v_tex;
 out float v_tex_enabled;
+out float v_dist;
 
 void main() {
-    gl_Position = u_view * u_world * u_model * vec4(a_pos, 1);
+    vec4 pos = u_world * u_model * vec4(a_pos, 1);
+    v_dist = length(pos);
+    gl_Position = u_view * pos;
 
     vec3 block_color = vec3(
         float((a_data & 0x0000FU) >>  0U) / 15.0,
diff --git a/src/main.onyx b/src/main.onyx
index 719204c..03ac7d9 100644
--- a/src/main.onyx
+++ b/src/main.onyx
@@ -94,6 +94,8 @@ setup_opengl :: () {
         "assets/shaders/world_fragment.glsl");
 
     shader_link_world_matrix_block(world_shader);
+    shader_set_uniform(world_shader, #cstr "u_fog_start", 40.0f);
+    shader_set_uniform(world_shader, #cstr "u_fog_range", 5.0f);
 
     font = font_lookup(.{"./assets/fonts/calibri.ttf", 32});
 
@@ -148,6 +150,7 @@ draw :: () {
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
     shader_use(world_shader);
+    shader_set_uniform(world_shader, #cstr "u_fog_color", Vector3.{ 0.7, 0.7, 0.9 });
     shader_set_uniform(world_shader, #cstr "u_texture", 0);
     world_draw(world);
     
@@ -165,7 +168,8 @@ draw :: () {
         font_print(font, 0, 96, "Facing: {}", camera.y_rot * 180 / math.PI);
         font_print(font, 0, 128, "Looking at: {}", selected_block);
         font_print(font, 0, 160, "Chunk: {}", player_chunk);
-        font_print(font, 0, 192, "Chunks loading: {}", world.chunks_to_load.count);
+        // font_print(font, 0, 192, "Chunks loading: {}", world.chunks_to_load.count);
+        font_print(font, 0, 192, "Heap: {.2}MB  Freed: {.2}MB\n", cast(f32) alloc.heap.get_watermark() / (1024 * 1024), cast(f32) alloc.heap.get_freed_size() / (1024 * 1024));
     }
 
     glfwSwapBuffers(window);
diff --git a/src/shader.onyx b/src/shader.onyx
index b7118e4..e5fdca6 100644
--- a/src/shader.onyx
+++ b/src/shader.onyx
@@ -60,9 +60,17 @@ shader_set_uniform :: (shader: Shader, uniform: cstr, value: $T) {
     glUseProgram(shader.prog);
     location := glGetUniformLocation(shader.prog, uniform);
 
-    switch T {
-        case i32, u32 do glUniform1i(location, value);
-        case #default do assert(false, "Bad case.");
+    set_uniform_internal(location, value);
+    
+    set_uniform_internal :: #match {
+        macro (location: GLint, value: u32) do glUniform1i(location, value); ,
+        macro (location: GLint, value: f32) do glUniform1f(location, value); ,
+        macro (location: GLint, value: Vector3) do glUniform3f(location, value.x, value.y, value.z); ,
+
+        macro (location: GLint, value: $T) {
+            buffer: [1024] u8;
+            assert(false, conv.format(buffer, "Bad shader_set_uniform case: {}", T));
+        }
     }
 }
 
diff --git a/src/worldgen.onyx b/src/worldgen.onyx
index 1df745a..038b5ef 100644
--- a/src/worldgen.onyx
+++ b/src/worldgen.onyx
@@ -2,7 +2,7 @@
 use package core
 #local perlin :: package perlin
 
-#local seed :: 1234
+#local seed :: 8675309
 
 generate_chunk :: (world: ^World, chunk: ^Chunk) {
     for cz: 32 do for cx: 32 {