Use the GL_RED texture format instead of GL_LUMINANCE.

[movit] / init.cpp

diff --git a/init.cpp b/init.cpp
index 4003163d9494843b3eccc42910ca41084b52a691..1d7c46a50a63fb0cb1138f885efae4526eaaef0b 100644 (file)
--- a/init.cpp
+++ b/init.cpp
@@ -89,40 +89,35 @@ void measure_texel_subpixel_precision()
        // texture coordinates in order not to get long stretches of (1,1,1,...)
        // at the start and (...,0,0,0) at the end.
        float vertices[] = {
+               0.0f, 1.0f,
                0.0f, 0.0f,
-               1.0f, 0.0f,
                1.0f, 1.0f,
-               0.0f, 1.0f
+               1.0f, 0.0f
        };
        float texcoords[] = {
+               0.25f, 0.0f,
                0.25f, 0.0f,
                0.75f, 0.0f,
-               0.75f, 0.0f,
-               0.25f, 0.0f
+               0.75f, 0.0f
        };
 
-       int position_attrib = glGetAttribLocation(glsl_program_num, "position");
-       assert(position_attrib != -1);
-       int texcoord_attrib = glGetAttribLocation(glsl_program_num, "texcoord");
-       assert(texcoord_attrib != -1);
-       glEnableVertexAttribArray(position_attrib);
-       check_error();
-       glVertexAttribPointer(position_attrib, 2, GL_FLOAT, GL_FALSE, 0, vertices);
+       GLuint vao;
+       glGenVertexArrays(1, &vao);
        check_error();
-       glEnableVertexAttribArray(texcoord_attrib);
-       check_error();
-       glVertexAttribPointer(texcoord_attrib, 2, GL_FLOAT, GL_FALSE, 0, texcoords);
+       glBindVertexArray(vao);
        check_error();
 
-       glDrawArrays(GL_QUADS, 0, 4);
+       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(texcoords), texcoords);
+
+       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();
-       glDisableVertexAttribArray(position_attrib);
-       check_error();
-       glDisableVertexAttribArray(texcoord_attrib);
-       check_error();
 
        // Now read the data back and see what the card did.
        // (We only look at the red channel; the others will surely be the same.)
@@ -153,6 +148,8 @@ void measure_texel_subpixel_precision()
        check_error();
 
        resource_pool.release_glsl_program(glsl_program_num);
+       glDeleteVertexArrays(1, &vao);
+       check_error();
 }
 
 void measure_roundoff_problems()
@@ -219,36 +216,35 @@ void measure_roundoff_problems()
 
        // Draw the texture stretched over a long quad, interpolating it out.
        float vertices[] = {
+               0.0f, 1.0f,
                0.0f, 0.0f,
-               1.0f, 0.0f,
                1.0f, 1.0f,
-               0.0f, 1.0f
+               1.0f, 0.0f
        };
        float texcoords[] = {
+               0.25f, 0.0f,
                0.25f, 0.0f,
                0.75f, 0.0f,
-               0.75f, 0.0f,
-               0.25f, 0.0f
+               0.75f, 0.0f
        };
-       int position_attrib = glGetAttribLocation(glsl_program_num, "position");
-       assert(position_attrib != -1);
-       int texcoord_attrib = glGetAttribLocation(glsl_program_num, "texcoord");
-       assert(texcoord_attrib != -1);
-       glEnableVertexAttribArray(position_attrib);
-       check_error();
-       glVertexAttribPointer(position_attrib, 2, GL_FLOAT, GL_FALSE, 0, vertices);
+
+       GLuint vao;
+       glGenVertexArrays(1, &vao);
        check_error();
-       glEnableVertexAttribArray(texcoord_attrib);
+       glBindVertexArray(vao);
        check_error();
-       glVertexAttribPointer(texcoord_attrib, 2, GL_FLOAT, GL_FALSE, 0, texcoords);
+
+       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(texcoords), texcoords);
+
+       glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
        check_error();
-       glDrawArrays(GL_QUADS, 0, 4);
+
+       cleanup_vertex_attribute(glsl_program_num, "position", position_vbo);
+       cleanup_vertex_attribute(glsl_program_num, "texcoord", texcoord_vbo);
 
        glUseProgram(0);
        check_error();
-       glDisableVertexAttribArray(position_attrib);
-       check_error();
-       glDisableVertexAttribArray(texcoord_attrib);
 
        // Now read the data back and see what the card did. (Ignore the last value.)
        // (We only look at the red channel; the others will surely be the same.)
@@ -281,6 +277,8 @@ void measure_roundoff_problems()
        check_error();
 
        resource_pool.release_glsl_program(glsl_program_num);
+       glDeleteVertexArrays(1, &vao);
+       check_error();
 }
 
 bool check_extensions()