X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=effect_chain.cpp;h=5c4b52246b255738b2c8b764c13c12547e215ef1;hb=6bf496a34a84fb14b1b3b6debfd42ba36568b879;hp=4c2df4c2de6dbce9563c4f34700891b113acdc7e;hpb=06ba8d86c019208682d8883dc7187df37b027814;p=movit

diff --git a/effect_chain.cpp b/effect_chain.cpp
index 4c2df4c..5c4b522 100644
--- a/effect_chain.cpp
+++ b/effect_chain.cpp
@@ -39,6 +39,7 @@ EffectChain::EffectChain(float aspect_nom, float aspect_denom, ResourcePool *res
 	  aspect_denom(aspect_denom),
 	  dither_effect(NULL),
 	  num_dither_bits(0),
+	  output_origin(OUTPUT_ORIGIN_BOTTOM_LEFT),
 	  finalized(false),
 	  resource_pool(resource_pool),
 	  do_phase_timing(false) {
@@ -207,7 +208,7 @@ Effect *EffectChain::add_effect(Effect *effect, const vector<Effect *> &inputs)
 	return effect;
 }
 
-// GLSL pre-1.30 doesn't support token pasting. Replace PREFIX(x) with <effect_id>_x.
+// ESSL doesn't support token pasting. Replace PREFIX(x) with <effect_id>_x.
 string replace_prefix(const string &text, const string &prefix)
 {
 	string output;
@@ -407,6 +408,17 @@ void EffectChain::compile_glsl_program(Phase *phase)
 	frag_shader = frag_shader_header + frag_shader_uniforms + frag_shader;
 
 	string vert_shader = read_version_dependent_file("vs", "vert");
+
+	// If we're the last phase and need to flip the picture to compensate for
+	// the origin, tell the vertex shader so.
+	if (phase->output_node->outgoing_links.empty() && output_origin == OUTPUT_ORIGIN_TOP_LEFT) {
+		const string needle = "#define FLIP_ORIGIN 0";
+		size_t pos = vert_shader.find(needle);
+		assert(pos != string::npos);
+
+		vert_shader[pos + needle.size() - 1] = '1';
+	}
+
 	phase->glsl_program_num = resource_pool->compile_glsl_program(vert_shader, frag_shader);
 
 	// Collect the resulting location numbers for each uniform.