Add zooming to ResampleEffect.

[movit] / effect_chain.cpp

diff --git a/effect_chain.cpp b/effect_chain.cpp
index e4ab7199c8d23320c545d47c98b4c53dec39af3b..0a01bd356e6066261910a60e4ee2af2813d428f5 100644 (file)
--- a/effect_chain.cpp
+++ b/effect_chain.cpp
@@ -1,6 +1,6 @@
 #define GL_GLEXT_PROTOTYPES 1
 
-#include <GL/glew.h>
+#include <epoxy/gl.h>
 #include <assert.h>
 #include <locale.h>
 #include <math.h>
@@ -53,15 +53,6 @@ EffectChain::~EffectChain()
                delete nodes[i];
        }
        for (unsigned i = 0; i < phases.size(); ++i) {
-               glBindVertexArray(phases[i]->vao);
-               check_error();
-
-               cleanup_vertex_attribute(phases[i]->glsl_program_num, "position", phases[i]->position_vbo);
-               cleanup_vertex_attribute(phases[i]->glsl_program_num, "texcoord", phases[i]->texcoord_vbo);
-
-               glBindVertexArray(0);
-               check_error();
-
                resource_pool->release_glsl_program(phases[i]->glsl_program_num);
                delete phases[i];
        }
@@ -238,7 +229,7 @@ string replace_prefix(const string &text, const string &prefix)
 
 void EffectChain::compile_glsl_program(Phase *phase)
 {
-       string frag_shader = read_file("header.frag");
+       string frag_shader = read_version_dependent_file("header", "frag");
 
        // Create functions for all the texture inputs that we need.
        for (unsigned i = 0; i < phase->inputs.size(); ++i) {
@@ -249,7 +240,7 @@ void EffectChain::compile_glsl_program(Phase *phase)
        
                frag_shader += string("uniform sampler2D tex_") + effect_id + ";\n";
                frag_shader += string("vec4 ") + effect_id + "(vec2 tc) {\n";
-               frag_shader += "\treturn texture2D(tex_" + string(effect_id) + ", tc);\n";
+               frag_shader += "\treturn tex2D(tex_" + string(effect_id) + ", tc);\n";
                frag_shader += "}\n";
                frag_shader += "\n";
        }
@@ -288,30 +279,10 @@ void EffectChain::compile_glsl_program(Phase *phase)
                frag_shader += "\n";
        }
        frag_shader += string("#define INPUT ") + phase->effect_ids[phase->effects.back()] + "\n";
-       frag_shader.append(read_file("footer.frag"));
-
-       phase->glsl_program_num = resource_pool->compile_glsl_program(read_file("vs.vert"), frag_shader);
-
-       // Prepare the geometry for the fullscreen quad used in this phase.
-       // (We have separate VAOs per shader, since the bindings can in theory
-       // be different.)
-       float vertices[] = {
-               0.0f, 1.0f,
-               0.0f, 0.0f,
-               1.0f, 1.0f,
-               1.0f, 0.0f
-       };
+       frag_shader.append(read_version_dependent_file("footer", "frag"));
 
-       glGenVertexArrays(1, &phase->vao);
-       check_error();
-       glBindVertexArray(phase->vao);
-       check_error();
-
-       phase->position_vbo = fill_vertex_attribute(phase->glsl_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
-       phase->texcoord_vbo = fill_vertex_attribute(phase->glsl_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
-
-       glBindVertexArray(0);
-       check_error();
+       string vert_shader = read_version_dependent_file("vs", "vert");
+       phase->glsl_program_num = resource_pool->compile_glsl_program(vert_shader, frag_shader);
 }
 
 // Construct GLSL programs, starting at the given effect and following
@@ -1484,8 +1455,6 @@ void EffectChain::render_to_fbo(GLuint dest_fbo, unsigned width, unsigned height
 
        glBindFramebuffer(GL_FRAMEBUFFER, 0);
        check_error();
-       glBindVertexArray(0);
-       check_error();
        glUseProgram(0);
        check_error();
 }
@@ -1525,8 +1494,7 @@ void EffectChain::execute_phase(Phase *phase, bool last_phase, map<Phase *, GLui
 
        // And now the output. (Already set up for us if it is the last phase.)
        if (!last_phase) {
-               void *context = get_gl_context_identifier();
-               fbo = resource_pool->create_fbo(context, (*output_textures)[phase]);
+               fbo = resource_pool->create_fbo((*output_textures)[phase]);
                glBindFramebuffer(GL_FRAMEBUFFER, fbo);
                glViewport(0, 0, phase->output_width, phase->output_height);
        }
@@ -1547,11 +1515,32 @@ void EffectChain::execute_phase(Phase *phase, bool last_phase, map<Phase *, GLui
                }
        }
 
-       glBindVertexArray(phase->vao);
+       // Now draw!
+       float vertices[] = {
+               0.0f, 1.0f,
+               0.0f, 0.0f,
+               1.0f, 1.0f,
+               1.0f, 0.0f
+       };
+
+       GLuint vao;
+       glGenVertexArrays(1, &vao);
+       check_error();
+       glBindVertexArray(vao);
        check_error();
+
+       GLuint position_vbo = fill_vertex_attribute(glsl_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
+       GLuint texcoord_vbo = fill_vertex_attribute(glsl_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
+
        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
        check_error();
 
+       cleanup_vertex_attribute(glsl_program_num, "position", position_vbo);
+       cleanup_vertex_attribute(glsl_program_num, "texcoord", texcoord_vbo);
+       
+       glUseProgram(0);
+       check_error();
+
        for (unsigned i = 0; i < phase->effects.size(); ++i) {
                Node *node = phase->effects[i];
                node->effect->clear_gl_state();
@@ -1560,6 +1549,9 @@ void EffectChain::execute_phase(Phase *phase, bool last_phase, map<Phase *, GLui
        if (!last_phase) {
                resource_pool->release_fbo(fbo);
        }
+
+       glDeleteVertexArrays(1, &vao);
+       check_error();
 }
 
 void EffectChain::setup_rtt_sampler(GLuint glsl_program_num, int sampler_num, const string &effect_id, bool use_mipmaps)