From 13f9ef04aaf5f3583ef83bffc094758f0d640634 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 7 Dec 2019 15:54:01 +0100
Subject: GL3 Test: Move shaders to separate files

---
 test/pugl_gl3_test.c | 76 +++++++++++++++++++++++-----------------------------
 1 file changed, 33 insertions(+), 43 deletions(-)

(limited to 'test')

diff --git a/test/pugl_gl3_test.c b/test/pugl_gl3_test.c
index 8dea5a1..9ddf7db 100644
--- a/test/pugl_gl3_test.c
+++ b/test/pugl_gl3_test.c
@@ -73,49 +73,6 @@ static const GLfloat rectVertices[] = {
 
 static const GLuint rectIndices[4] = {0, 1, 2, 3};
 
-/* The vertex shader is trivial, but forwards scaled UV coordinates (in pixels)
-   to the fragment shader for drawing the border. */
-static const char* vertexSource = //
-        "#version 330\n"
-        "uniform mat4 MVP;\n"
-        "uniform vec2 u_size;\n"
-        "in vec2 v_position;\n"
-        "noperspective out vec2 f_uv;\n"
-        "void main() {\n"
-        "    f_uv = v_position * u_size;\n"
-        "    gl_Position = MVP * vec4(v_position, 0.0, 1.0);\n"
-        "}\n";
-
-/* The fragment shader uses the UV coordinates to calculate whether it is in
-   the T, R, B, or L border.  These are then mixed with the border color, and
-   their inverse is mixed with the fill color, to calculate the fragment color.
-   For example, if we are in the top border, then T=1, so the border mix factor
-   TRBL=1, and the fill mix factor (1-TRBL) is 0.
-
-   The use of pixel units here is handy because the border width can be
-   specified precisely in pixels to draw sharp lines.  The border width is just
-   hardcoded, but could be made a uniform or vertex attribute easily enough. */
-static const char* fragmentSource = //
-        "#version 330\n"
-        "uniform vec2 u_size;\n"
-        "uniform vec4 u_borderColor;\n"
-        "uniform vec4 u_fillColor;\n"
-        "noperspective in vec2 f_uv;\n"
-        "layout(location = 0) out vec4 FragColor;\n"
-        "void main() {\n"
-        "    const float border_width = 2.0;\n"
-        "\n"
-        "    float t          = step(border_width, f_uv[1]);\n"
-        "    float r          = step(border_width, u_size.x - f_uv[0]);\n"
-        "    float b          = step(border_width, u_size.y - f_uv[1]);\n"
-        "    float l          = step(border_width, f_uv[0]);\n"
-        "    float fill_mix   = t * r * b * l;\n"
-        "    float border_mix = 1.0 - fill_mix;\n"
-        "    vec4  fill       = fill_mix * u_fillColor;\n"
-        "    vec4  border     = border_mix * u_borderColor;\n"
-        "    FragColor        = fill + border;\n"
-        "}\n";
-
 typedef struct
 {
 	PuglTestOptions opts;
@@ -263,6 +220,27 @@ makeRects(const size_t numRects)
 	return rects;
 }
 
+static char*
+loadShader(const char* const path)
+{
+	FILE* const file = fopen(path, "r");
+	if (!file) {
+		logError("Failed to open '%s'\n", path);
+		return NULL;
+	}
+
+	fseek(file, 0, SEEK_END);
+	const long fileSize = ftell(file);
+
+	fseek(file, 0, SEEK_SET);
+	char* source = (char*)calloc(1, fileSize + 1);
+
+	fread(source, 1, fileSize, file);
+	fclose(file);
+
+	return source;
+}
+
 int
 main(int argc, char** argv)
 {
@@ -328,8 +306,20 @@ main(int argc, char** argv)
 		return 1;
 	}
 
+	// Load shader sources
+	char* const vertexSource   = loadShader("shaders/rect.vert");
+	char* const fragmentSource = loadShader("shaders/rect.frag");
+	if (!vertexSource || !fragmentSource) {
+		logError("Failed to load shader sources\n");
+		puglFreeView(app.view);
+		puglFreeWorld(app.world);
+		return 1;
+	}
+
 	// Compile rectangle shaders and program
 	app.drawRect = compileProgram(vertexSource, fragmentSource);
+	free(fragmentSource);
+	free(vertexSource);
 	if (!app.drawRect.program) {
 		puglFreeView(app.view);
 		puglFreeWorld(app.world);
-- 
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