X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=effect_chain.cpp;h=a549087862a47e5421ebe9b1a0db499911d7729b;hb=cfc0e5e46303c67cdb9b432fbcaf79f314b86ac9;hp=b5d136b275dc7d58c9791f0b58f25768afad3bb5;hpb=ac539d70a718bce094e1118a3919972445b65979;p=movit

diff --git a/effect_chain.cpp b/effect_chain.cpp
index b5d136b..a549087 100644
--- a/effect_chain.cpp
+++ b/effect_chain.cpp
@@ -242,7 +242,18 @@ Phase *EffectChain::compile_glsl_program(
 	}
 	frag_shader += std::string("#define INPUT ") + effects.back()->effect_id + "\n";
 	frag_shader.append(read_file("footer.frag"));
-	printf("%s\n", frag_shader.c_str());
+
+	// Output shader to a temporary file, for easier debugging.
+	static int compiled_shader_num = 0;
+	char filename[256];
+	sprintf(filename, "chain-%03d.frag", compiled_shader_num++);
+	FILE *fp = fopen(filename, "w");
+	if (fp == NULL) {
+		perror(filename);
+		exit(1);
+	}
+	fprintf(fp, "%s\n", frag_shader.c_str());
+	fclose(fp);
 	
 	GLuint glsl_program_num = glCreateProgram();
 	GLuint vs_obj = compile_shader(read_file("vs.vert"), GL_VERTEX_SHADER);
@@ -961,13 +972,21 @@ void EffectChain::finalize()
 	finalized = true;
 }
 
-void EffectChain::render_to_screen()
+void EffectChain::render_to_fbo(GLuint fbo, unsigned width, unsigned height)
 {
 	assert(finalized);
 
 	// Save original viewport.
-	GLint viewport[4];
-	glGetIntegerv(GL_VIEWPORT, viewport);
+	GLuint x = 0, y = 0;
+
+	if (width == 0 && height == 0) {
+		GLint viewport[4];
+		glGetIntegerv(GL_VIEWPORT, viewport);
+		x = viewport[0];
+		y = viewport[1];
+		width = viewport[2];
+		height = viewport[3];
+	}
 
 	// Basic state.
 	glDisable(GL_BLEND);
@@ -1045,10 +1064,10 @@ void EffectChain::render_to_screen()
 
 		// And now the output.
 		if (phase == phases.size() - 1) {
-			// Last phase goes directly to the screen.
-			glBindFramebuffer(GL_FRAMEBUFFER, 0);
+			// Last phase goes to the output the user specified.
+			glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 			check_error();
-			glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
+			glViewport(x, y, width, height);
 		} else {
 			Node *output_node = phases[phase]->effects.back();
 			glFramebufferTexture2D(