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authorDavid Robillard <d@drobilla.net>2019-12-07 15:54:01 +0100
committerDavid Robillard <d@drobilla.net>2019-12-11 22:59:50 +0100
commit13f9ef04aaf5f3583ef83bffc094758f0d640634 (patch)
tree234967ce962d3e1033634569e7a40c80c974abd9 /test/pugl_gl3_test.c
parent91773de7ac4e07643fc47f1f0c1fdb6a255f53d2 (diff)
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GL3 Test: Move shaders to separate files
Diffstat (limited to 'test/pugl_gl3_test.c')
-rw-r--r--test/pugl_gl3_test.c76
1 files changed, 33 insertions, 43 deletions
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);