98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
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#include "./menu_background.h"
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#include <assert.h>
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#include <GL/glew.h>
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#include "util/gleasy/program.h"
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#include "util/math/algorithm.h"
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#include "util/memory/memory.h"
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#include "./uniblock.h"
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/* resources */
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#include "anysrc/header.shader.h"
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#include "anysrc/menu_background.vshader.h"
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#include "anysrc/menu_background.fshader.h"
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#define LOSHADER_MENU_BACKGROUND_UNIFORM_ALPHA 0
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struct loshader_menu_background_drawer_t {
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const loshader_menu_background_program_t* prog;
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const loshader_uniblock_t* uniblock;
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float alpha;
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};
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#define LOSHADER_MENU_BACKGROUND_UNIBLOCK_INDEX 0
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void loshader_menu_background_program_initialize(
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loshader_menu_background_program_t* prog) {
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assert(prog != NULL);
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*prog = gleasy_program_new(
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loshader_header_shader_,
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sizeof(loshader_header_shader_),
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loshader_menu_background_vshader_,
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sizeof(loshader_menu_background_vshader_),
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loshader_menu_background_fshader_,
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sizeof(loshader_menu_background_fshader_));
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const GLuint uniblock = glGetUniformBlockIndex(*prog, "uniblock");
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assert(glGetError() == GL_NO_ERROR);
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glUniformBlockBinding(
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*prog, uniblock, LOSHADER_MENU_BACKGROUND_UNIBLOCK_INDEX);
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}
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void loshader_menu_background_program_deinitialize(
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loshader_menu_background_program_t* prog) {
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assert(prog != NULL);
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glDeleteProgram(*prog);
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}
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loshader_menu_background_drawer_t* loshader_menu_background_drawer_new(
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const loshader_menu_background_program_t* prog,
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const loshader_uniblock_t* uniblock) {
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assert(prog != NULL);
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assert(uniblock != NULL);
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loshader_menu_background_drawer_t* drawer = memory_new(sizeof(*drawer));
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*drawer = (typeof(*drawer)) {
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.prog = prog,
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.uniblock = uniblock,
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};
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return drawer;
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}
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void loshader_menu_background_drawer_delete(
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loshader_menu_background_drawer_t* drawer) {
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if (drawer == NULL) return;
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memory_delete(drawer);
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}
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void loshader_menu_background_drawer_set_alpha(
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loshader_menu_background_drawer_t* drawer, float alpha) {
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assert(drawer != NULL);
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assert(MATH_FLOAT_VALID(alpha));
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drawer->alpha = alpha;
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}
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void loshader_menu_background_drawer_draw(
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const loshader_menu_background_drawer_t* drawer) {
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assert(drawer != NULL);
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if (drawer->alpha == 0) return;
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glUseProgram(*drawer->prog);
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loshader_uniblock_bind(
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drawer->uniblock, LOSHADER_MENU_BACKGROUND_UNIBLOCK_INDEX);
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glUniform1f(LOSHADER_MENU_BACKGROUND_UNIFORM_ALPHA, drawer->alpha);
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glDrawArrays(GL_TRIANGLES, 0, 6);
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}
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