X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=effect_chain.cpp;h=50fe599280f0c95350f67d059b5c845b6042bda6;hb=8f070dcdd579e19e092a6619115f4b084fbb2c33;hp=05adfd835a5b2189e3e5da319c12dd47ac5ff45a;hpb=a88f299483ffe5068cd2828513078b9103325da8;p=movit

diff --git a/effect_chain.cpp b/effect_chain.cpp
index 05adfd8..50fe599 100644
--- a/effect_chain.cpp
+++ b/effect_chain.cpp
@@ -1,12 +1,20 @@
+#define GL_GLEXT_PROTOTYPES 1
+
+#include <stdio.h>
+#include <string.h>
 #include <assert.h>
 
+#include <GL/gl.h>
+#include <GL/glext.h>
+
+#include "util.h"
 #include "effect_chain.h"
 #include "gamma_expansion_effect.h"
 #include "lift_gamma_gain_effect.h"
 #include "colorspace_conversion_effect.h"
 
 EffectChain::EffectChain(unsigned width, unsigned height)
-	: width(width), height(height) {}
+	: width(width), height(height), finalized(false) {}
 
 void EffectChain::add_input(const ImageFormat &format)
 {
@@ -53,7 +61,81 @@ Effect *EffectChain::add_effect(EffectId effect_id)
 		current_color_space = COLORSPACE_sRGB;
 	}
 
+	// not handled yet
+	assert(!effect->needs_many_samples());
+	assert(!effect->needs_mipmaps());
+
 	effects.push_back(effect);
 	return effect;
 }
 
+// GLSL pre-1.30 doesn't support token pasting. Replace PREFIX(x) with <effect_id>_x.
+std::string replace_prefix(const std::string &text, const std::string &prefix)
+{
+	std::string output;
+	size_t start = 0;
+
+	while (start < text.size()) {
+		size_t pos = text.find("PREFIX(", start);
+		if (pos == std::string::npos) {
+			output.append(text.substr(start, std::string::npos));
+			break;
+		}
+
+		output.append(text.substr(start, pos - start));
+		output.append(prefix);
+		output.append("_");
+
+		pos += strlen("PREFIX(");
+	
+		// Output stuff until we find the matching ), which we then eat.
+		int depth = 1;
+		size_t end_arg_pos = pos;
+		while (end_arg_pos < text.size()) {
+			if (text[end_arg_pos] == '(') {
+				++depth;
+			} else if (text[end_arg_pos] == ')') {
+				--depth;
+				if (depth == 0) {
+					break;
+				}
+			}
+			++end_arg_pos;
+		}
+		output.append(text.substr(pos, end_arg_pos - pos));
+		++end_arg_pos;
+		assert(depth == 0);
+		start = end_arg_pos;
+	}
+	return output;
+}
+
+void EffectChain::finalize()
+{
+	std::string frag_shader = read_file("header.glsl");
+
+	for (unsigned i = 0; i < effects.size(); ++i) {
+		char effect_id[256];
+		sprintf(effect_id, "eff%d", i);
+	
+		frag_shader += "\n";
+		frag_shader += std::string("#define FUNCNAME ") + effect_id + "\n";
+		frag_shader += replace_prefix(effects[i]->output_convenience_uniforms(), effect_id);
+		frag_shader += replace_prefix(effects[i]->output_glsl(), effect_id);
+		frag_shader += "#undef PREFIX\n";
+		frag_shader += "#undef FUNCNAME\n";
+		frag_shader += std::string("#define LAST_INPUT ") + effect_id + "\n";
+		frag_shader += "\n";
+	}
+	printf("%s\n", frag_shader.c_str());
+	
+	glsl_program_num = glCreateProgram();
+	GLhandleARB vs_obj = compile_shader(read_file("vs.glsl"), GL_VERTEX_SHADER);
+	GLhandleARB fs_obj = compile_shader(frag_shader, GL_FRAGMENT_SHADER);
+	glAttachObjectARB(glsl_program_num, vs_obj);
+	check_error();
+	glAttachObjectARB(glsl_program_num, fs_obj);
+	check_error();
+	glLinkProgram(glsl_program_num);
+	check_error();
+}