Add tests for sf::Shader::loadFromFile

Plus a few cleanups while I was in there

test/Graphics/Shader.test.cpp

@@ -142,7 +142,7 @@ TEST_CASE("[Graphics] sf::Shader (Dummy Implementation)", skipShaderDummyTests()
         CHECK_FALSE(sf::Shader::isGeometryAvailable());
     }
 
-    SECTION("Load")
+    SECTION("loadFromMemory()")
     {
         sf::Shader shader;
         CHECK_FALSE(shader.loadFromMemory(vertexSource, sf::Shader::Type::Vertex));
@@ -163,17 +163,55 @@ TEST_CASE("[Graphics] sf::Shader", skipShaderFullTests())
         STATIC_CHECK(std::is_nothrow_move_assignable_v<sf::Shader>);
     }
 
-    if (!sf::Shader::isAvailable())
-        return;
+    SECTION("Construction")
+    {
+        const sf::Shader shader;
+        CHECK(shader.getNativeHandle() == 0);
+    }
 
-    SECTION("Load")
+    SECTION("loadFromFile()")
+    {
+        SECTION("One shader")
         {
             sf::Shader shader;
-        CHECK(shader.loadFromMemory(vertexSource, sf::Shader::Type::Vertex));
+            CHECK(!shader.loadFromFile("does-not-exist.vert", sf::Shader::Type::Vertex));
+
+            CHECK(shader.loadFromFile("Graphics/shader.vert", sf::Shader::Type::Vertex) == sf::Shader::isAvailable());
+            CHECK(static_cast<bool>(shader.getNativeHandle()) == sf::Shader::isAvailable());
+
+            CHECK(shader.loadFromFile("Graphics/shader.frag", sf::Shader::Type::Fragment) == sf::Shader::isAvailable());
+            CHECK(static_cast<bool>(shader.getNativeHandle()) == sf::Shader::isAvailable());
+        }
+
+        SECTION("Two shaders")
+        {
+            sf::Shader shader;
+            CHECK(!shader.loadFromFile("does-not-exist.vert", "Graphics/shader.frag"));
+            CHECK(!shader.loadFromFile("Graphics/shader.vert", "does-not-exist.frag"));
+            CHECK(shader.loadFromFile("Graphics/shader.vert", "Graphics/shader.frag") == sf::Shader::isAvailable());
+            CHECK(static_cast<bool>(shader.getNativeHandle()) == sf::Shader::isAvailable());
+        }
+
+        SECTION("Three shaders")
+        {
+            sf::Shader shader;
+            CHECK(!shader.loadFromFile("does-not-exist.vert", "Graphics/shader.geom", "Graphics/shader.frag"));
+            CHECK(!shader.loadFromFile("Graphics/shader.vert", "does-not-exist.geom", "Graphics/shader.frag"));
+            CHECK(!shader.loadFromFile("Graphics/shader.vert", "Graphics/shader.geom", "does-not-exist.frag"));
+            CHECK(shader.loadFromFile("Graphics/shader.vert", "Graphics/shader.geom", "Graphics/shader.frag") ==
+                  sf::Shader::isGeometryAvailable());
+            CHECK(static_cast<bool>(shader.getNativeHandle()) == sf::Shader::isGeometryAvailable());
+        }
+    }
+
+    SECTION("loadFromMemory()")
+    {
+        sf::Shader shader;
+        CHECK(shader.loadFromMemory(vertexSource, sf::Shader::Type::Vertex) == sf::Shader::isAvailable());
         CHECK_FALSE(shader.loadFromMemory(geometrySource, sf::Shader::Type::Geometry));
-        CHECK(shader.loadFromMemory(fragmentSource, sf::Shader::Type::Fragment));
-        CHECK(shader.loadFromMemory(vertexSource, fragmentSource));
-        CHECK(sf::Shader::isGeometryAvailable() == shader.loadFromMemory(vertexSource, geometrySource, fragmentSource));
-        CHECK(shader.getNativeHandle() != 0);
+        CHECK(shader.loadFromMemory(fragmentSource, sf::Shader::Type::Fragment) == sf::Shader::isAvailable());
+        CHECK(shader.loadFromMemory(vertexSource, fragmentSource) == sf::Shader::isAvailable());
+        CHECK(shader.loadFromMemory(vertexSource, geometrySource, fragmentSource) == sf::Shader::isGeometryAvailable());
+        CHECK(static_cast<bool>(shader.getNativeHandle()) == sf::Shader::isAvailable());
     }
 }

test/Graphics/shader.frag

@@ -0,0 +1,9 @@
+uniform sampler2D texture;
+uniform float blink_alpha;
+
+void main()
+{
+    vec4 pixel = gl_Color;
+    pixel.a = blink_alpha;
+    gl_FragColor = pixel;
+}

test/Graphics/shader.geom

@@ -0,0 +1,56 @@
+#version 150
+
+// The render target's resolution (used for scaling)
+uniform vec2 resolution;
+
+// The billboards' size
+uniform vec2 size;
+
+// Input is the passed point cloud
+layout (points) in;
+
+// The output will consist of triangle strips with four vertices each
+layout (triangle_strip, max_vertices = 4) out;
+
+// Output texture coordinates
+out vec2 tex_coord;
+
+// Main entry point
+void main()
+{
+    // Calculate the half width/height of the billboards
+    vec2 half_size = size / 2.f;
+
+    // Scale the size based on resolution (1 would be full width/height)
+    half_size /= resolution;
+
+    // Iterate over all vertices
+    for (int i = 0; i < gl_in.length(); ++i)
+    {
+        // Retrieve the passed vertex position
+        vec2 pos = gl_in[i].gl_Position.xy;
+
+        // Bottom left vertex
+        gl_Position = vec4(pos - half_size, 0.f, 1.f);
+        tex_coord = vec2(1.f, 1.f);
+        EmitVertex();
+
+        // Bottom right vertex
+        gl_Position = vec4(pos.x + half_size.x, pos.y - half_size.y, 0.f, 1.f);
+        tex_coord = vec2(0.f, 1.f);
+        EmitVertex();
+
+        // Top left vertex
+        gl_Position = vec4(pos.x - half_size.x, pos.y + half_size.y, 0.f, 1.f);
+        tex_coord = vec2(1.f, 0.f);
+        EmitVertex();
+
+        // Top right vertex
+        gl_Position = vec4(pos + half_size, 0.f, 1.f);
+        tex_coord = vec2(0.f, 0.f);
+        EmitVertex();
+
+        // And finalize the primitive
+        EndPrimitive();
+    }
+}

test/Graphics/shader.vert

@@ -0,0 +1,19 @@
+uniform vec2 storm_position;
+uniform float storm_total_radius;
+uniform float storm_inner_radius;
+
+void main()
+{
+    vec4 vertex = gl_ModelViewMatrix * gl_Vertex;
+    vec2 offset = vertex.xy - storm_position;
+    float len = length(offset);
+    if (len < storm_total_radius)
+    {
+        float push_distance = storm_inner_radius + len / storm_total_radius * (storm_total_radius - storm_inner_radius);
+        vertex.xy = storm_position + normalize(offset) * push_distance;
+    }
+
+    gl_Position = gl_ProjectionMatrix * vertex;
+    gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
+    gl_FrontColor = gl_Color;
+}